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Letteratura scientifica selezionata sul tema "Vegetable oils"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Vegetable oils"

Gunstone, Frank D. "Nine vegetable oils". Lipid Technology 22, n. 3 (marzo 2010): 72. http://dx.doi.org/10.1002/lite.201000007.

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Afonso, Inês S., Glauco Nobrega, Rui Lima, José R. Gomes e João E. Ribeiro. "Conventional and Recent Advances of Vegetable Oils as Metalworking Fluids (MWFs): A Review". Lubricants 11, n. 4 (30 marzo 2023): 160. http://dx.doi.org/10.3390/lubricants11040160.

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Vegetable oils have been used as metalworking fluids (MWFs) for many years, particularly in small-scale metalworking operations and in industries where environmental regulations are strict. Before the development of modern MWFs, vegetable oils were one of the most common lubricants used for metalworking tools. The use of vegetable oils can be traced back to ancient civilizations such as Egypt, Greece, and Rome, where olive oil was commonly used to lubricate metal tools and weapons. Today, vegetable oils are used as MWFs in a variety of applications. They are often combined with additives or nanoparticles to enhance their performance, such as improving the lubricity, cooling properties, and stability of the oil, as well as reducing friction and wear on the cutting tool. Additives, such as antioxidants, anti-wear agents, and extreme pressure (EP) additives, can be used to improve the performance of vegetable oils as cutting fluids. Compared to standard MWFs, vegetable oils are generally more biodegradable and environmentally friendly, and can be more cost-effective. However, MWFs may offer superior performance in certain areas, such as lubrication and cooling. Ultimately, the choice of MWFs will depend on the specific requirements of the metalworking operation and the balance between performance, cost, and environmental considerations. As the demand for sustainability and environmental responsibility continues, the use of vegetable oils as MWFs is likely to become even more popular in the future. Overall, vegetable oils offer a viable and potentially attractive alternative to standard MWFs in certain applications. This review highlights both conventional and most recent advances in vegetal oils frequently used as lubricant fluids in manufacturing processes.

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Yang, Ruinan, Li Xue, Liangxiao Zhang, Xuefang Wang, Xin Qi, Jun Jiang, Li Yu et al. "Phytosterol Contents of Edible Oils and Their Contributions to Estimated Phytosterol Intake in the Chinese Diet". Foods 8, n. 8 (9 agosto 2019): 334. http://dx.doi.org/10.3390/foods8080334.

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Phytosterols are important micronutrients in human diets. Evidence has shown that phytosterols play an essential role in the reduction of cholesterol in blood and therefore decrease cardiovascular morbidity. In this study, the content and composition of phytosterols in different kinds of vegetable oils were analyzed, and the total phytosterol intake and contribution of foods to intake were estimated based on consumption data. The results showed that the phytosterol contents of rice bran oil, corn oil, and rapeseed oil were higher than those of other vegetable oils and the intake of phytosterol in the Chinese diet was about 392.3 mg/day. The main sources of phytosterols were edible vegetable oils (46.3%), followed by cereals (38.9%), vegetables (9.2%), nuts (2.0%), fruits (1.5%), beans and bean products (1.4%), and tubers (0.8%). Among all vegetable oils, rapeseed oil was the main individual contributor to phytosterol intake (22.9%), especially for the southern residents of China.

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Zandomeneghi, Maurizio, Laura Carbonaro e Chiara Caffarata. "Fluorescence of Vegetable Oils: Olive Oils". Journal of Agricultural and Food Chemistry 53, n. 3 (febbraio 2005): 759–66. http://dx.doi.org/10.1021/jf048742p.

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Can, Nuray, e Serap Duraklı Velioğlu. "Mycotoxins in vegetable oils". Food and Health 9, n. 3 (2023): 262–81. http://dx.doi.org/10.3153/fh23024.

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Vegetable oils are obtained from oil seeds and fruits and are widely used in the food, pharmaceutical, and chemical industries. In recent years, consumers' interest in vegetable oils has increased. The most important reason is that they are associated with health due to factors such as providing high energy, being a source of essential fatty acids, carrying fat-soluble vitamins, and containing compounds with antioxidant activity. On the other hand, they may contain some contaminants, such as mycotoxins. Vegetable oils can be contaminated with mycotoxins through raw materials exposed to unsuitable conditions. In this review, studies on the presence of mycotoxins in vegetable oils were examined. As a result, it has been observed that vegetable oils can be contaminated with mycotoxins such as aflatoxins, fumonisin, ochratoxin, deoxynivalenol, and zearalenone at different levels. It was concluded that contamination should be prevented and measures should be taken against mould growth and mycotoxin formation in raw materials.

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Khotijah, L., Nurmiasih Nurmiasih e D. Diapari. "Konsumsi Zat Makanan, Profil dan Metabolit Darah Induk Domba dengan Ransum Kaya Lemak Asal Minyak Nabati". Jurnal Ilmu Nutrisi dan Teknologi Pakan 18, n. 2 (31 agosto 2020): 38–42. http://dx.doi.org/10.29244/jintp.18.2.38-42.

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The aimed of this study was to evaluate the effect of vegetable fat supplementation in diet upon nutritional intake, the blood profile and metabolite of Garut ewes. Ten ewes with an initial weight of 24.87 ± 4.02 kg were used in this experiment. The feed composition and ingredients used were based on the feed commonly used by Garut sheep breeders. The Sunflower seed oil and canola oil were used as source of vegetables oils. The feeding treatments were R0 (control = without the addition of vegetable oils) and R1 (the ration contains 5% vegetable oil). The data obtained were analyzed by T-Test. Nutrient intakes, including dry matter (DM), Crude Protein (CP), Crude Fat (CF), Crude Fiber (CF) and Nitrogen-Free Extract (NFE) were similar between dietary treatment of 5% vegetable oils supplementation and control. While Fat consumption was significantly higher (p<0.01) in vegetable oil supplemented group (R1) compare to control. The results of blood metabolites, including glucose and cholesterol and blood profile (hematocrit, hemoglobin, leukocytes, erythrocytes) analysis indicate that vegetable oil supplementation can be done without any significant effect. It was concluded that the ration containing 5 percent vegetable oil was not interfere the nutrients consumption, blood profile and metabolite levels of the postpartum ewes, so it can be applied by farmers.

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Ionescu, Mihail, e Zoran Petrovic. "Phenolation of vegetable oils". Journal of the Serbian Chemical Society 76, n. 4 (2011): 591–606. http://dx.doi.org/10.2298/jsc100820050i.

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Novel bio-based compounds containing phenols suitable for the synthesis of polyurethanes were prepared. The direct alkylation of phenols with different vegetable oils in the presence of superacids (HBF4, triflic acid) as catalysts was studied. The reaction kinetics was followed by monitoring the decrease of the double bond content (iodine value) with time. In order to understand the mechanism of the reaction, phenol was alkylated with model compounds. The model compounds containing one internal double bond were 9-octadecene and methyl oleate and those with three double bonds were triolein and high oleic safflower oil (82% oleic acid). It was shown that the best structures for phenol alkylation are fatty acids with only one double bond (oleic acid). Fatty acids with two double bonds (linoleic acid) and three double bonds (linolenic acid) lead to polymerized oils by a Diels Alder reaction, and to a lesser extent to phenol alkylated products. The reaction product of direct alkylation of phenol with vegetable oils is a complex mixture of phenol alkylated with polymerized oil (30-60%), phenyl esters formed by transesterification of phenol with triglyceride ester bonds (<10 %) and unreacted oil (30%). The phenolated vegetable oils are new aromatic-aliphatic bio-based raw materials suitable for the preparation of polyols (by propoxylation, ethoxylation, Mannich reactions) for the preparation of polyurethanes, as intermediates for phenolic resins or as bio-based antioxidants.

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Mazza, G. (Joe). "Workshop on vegetable oils". LWT - Food Science and Technology 28, n. 3 (gennaio 1995): 14. http://dx.doi.org/10.1016/s0023-6438(95)95962-9.

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Issariyakul, Titipong, e Ajay K. Dalai. "Biodiesel from vegetable oils". Renewable and Sustainable Energy Reviews 31 (marzo 2014): 446–71. http://dx.doi.org/10.1016/j.rser.2013.11.001.

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Leonard, E. Charles. "High-erucic vegetable oils". Industrial Crops and Products 1, n. 2-4 (dicembre 1992): 119–23. http://dx.doi.org/10.1016/0926-6690(92)90009-k.

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Più fonti

Tesi sul tema "Vegetable oils"

Ramos, Boris. "Production of biodiesel from vegetable oils". Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145863.

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The production of biodiesel using vegetables oils is studied. Palm oil and its use for production of biodiesel have been focused. Palm tree is very productive and one of the most profitable for biodiesel production. Among the oilseed crops palm tree produce more oil per hectare. Palm oil has a good availability and a competitive price. The production of palm oil at the industrial plantation level has caused environmental damage. The Roundtable on Sustainable Palm Oil has established principles and criteria in order to certify a sustainable cultivation of the palm oil. The experimental work involves the production of biodiesel using corn oil. Ethanol and methanol are used as alcohols. Sodium and potassium hydroxides are selected as catalyst. The ratio alcohol to oil is the most important parameter in the production of biodiesel. An excess of alcohol is required to drive the reaction to the right. In the experiments with ethanol the yield of biodiesel increased with the ratio ethanol/oil achieving the highest yield at a molar ratio ethanol/oil: 7.78. In the experiments with methanol, using 0.9 g NaOH and 1 hour reaction time the highest yield was obtained with a molar ratio methanol:oil = 9. Using KOH as catalyst and 2 hour reaction time a very good yield is already obtained with a molar ratio methanol:oil = 4.5 The amount of catalyst is another studied parameter. In the experiments with ethanol, the amount of 0.8 mg NaOH and 1.2 mg KOH for 200 ml corn oil (0.22 mol) is enough in order to obtain a good yield. An increase of the amount of catalyst does not produce an increase of the yield of biodiesel. In experiments with methanol, using the lowest tested amount catalyst (0.85 g KOH and 0.23 g NaOH) a good yield of biodiesel is obtained. The effects of the reaction time, rate of mixing and the reaction temperature were studied in the experiments with methanol. The yield of biodiesel increased when the reaction time is increased from 1 to 2 hours. The yield of produced biodiesel increased from 90% to 94% when the rate of mixing was increased from 500 to 1500 rpm. Often the transesterification is carried out at a temperature near the boiling point of alcohol. The highest yield was obtained at 60 oC with KOH and at 55 oC using NaOH but already at 40 oC a good yield was obtained (89%).

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Sacchetti, Annalisa <1994&gt. "Catalytic hydrogenation of vegetable oils derivatives". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10070/1/Sacchetti%20Annalisa_final%20upload%20.pdf.

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During this project the catalytic hydrogenation of a mixture of fatty acids derivatives was performed in two different reactors (discontinuous batch and continuous flow); the attention was pointed out on the type of the catalyst employed, involving a screening among different noble metals and support with optimization of the reaction parameters. Interesting results were obtained in batch reactions with 0.3% wt Pd/C at 4 bar of H2 and 90°C, ensuring full conversion of the starting material and complete selectivity towards the saturated compounds. An insight of the kinetics of the reaction was performed, conducting the reaction for different time (0-6 hours). Also, fundamental parameters such as H2 pressure, stirring rate, temperature, metal type and support were evaluated for determining the most advantageous conditions to guarantee complete starting material conversion and high yields of desired products. The same tests were then performed employing a continuous flow reactor, confirming the high activity of 0.3% wt Pd/C at low contact time of 0.2 min. Despite stunning results were achieved with a single batch (discontinuous) or for low reaction time (1h in continuous), the catalyst performance started to worsen for multiple batch or longer time respectively. Investigations on the cause were executed, excluding immediately metal leaching thanks to ICP-AES analysis. Deactivation was attributable to absorption of reactants on the catalyst surface, which could lead to formation of oligomers. It was found that the deactivation rate, in the continuous reactor, was directly dependent on the hydrogen pressure, the contact time but even more importantly to the composition of the starting material: an increase of poly-unsaturated fatty acids derivatives affected negatively the catalyst stability, causing a faster decline of conversion and higher decrease in selectively. This was associated to a strong adsorption with consequent formation of oligomers, which occupied the active site, worsening the catalyst’s performance.

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Roy, Dibakar. "Modification of vegetable oils as a potential base oil and a multifunctional lube oil additive". Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4365.

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Good, Joanne Elizabeth. "Replacement of dietary fish oil with vegetable oils : effects on fish health". Thesis, University of Stirling, 2004. http://hdl.handle.net/1893/2005.

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The work presented in this thesis examined the effects of dietary fish oil replacement on fish innate and adaptive immune function, disease resistance tissue histopathology and fatty acid composition of lipids in peripheral blood leukocytes. Dietary trials with Atlantic salmon (Salmo salar), Sea bass (Dicentrarchus labrax), Atlantic cod (Gadus morhua) and Arctic char (Salvelinus alpinus) were conducted in which fish oil was replaced by rapeseed oil, linseed oil, olive oil, palm oil, echium oil or a mixture of these oils. A significant reduction in respiratory burst activity was most pronounced in salmon and sea bass fed high levels of rapeseed oil-containing diets. In addition, rapeseed and olive oil inclusion in the diets of salmon and sea bass significantly reduced the head kidney macrophage phagocytic capacity to engulf yeast particles. A reduction in prostaglandin E2 levels was found to be related to a reduction in macrophage respiratory burst activity in salmon fed linseed oil diets and sea bass fed a dietary blend of linseed, palm and rapeseed oils. Changes in macrophage function may be a contributing factor causing a reduction in serum lysozyme activity observed in some trials. No significant differences were detected in cumulative mortality of Atlantic salmon fed an equal blend of linseed and rapeseed oils challenged with Aeromonas salmonicida. However, resistance to Vibrio anguillarium was significantly impaired in Atlantic salmon fed a blended oil diet containing linseed, rapeseed and palm oil. The major histological difference of fish fed vegetable oil diets was the accumulation of lipid droplets in their livers. Dietary fatty acid composition significantly affected the fatty acid composition of peripheral blood leukocytes. Generally, fish fed vegetable oil diets had increased levels of oleic acid, linoleic acid and a-linolenic acid and decreased levels of eicosapentaenoic acid, docosahexaenoic acid and a lower n-3/n-6 ratio than fish fed a FO diet. In conclusion, the results from these studies suggest that farmed fish species can be cultured on diets containing vegetable oils as the added oil source. However, feeding high levels of some vegetable oils may significantly alter some immune responses in the fish, especially head kidney macrophage function, disease resistance and, in addition, may cause an increase in tissue histopathology.

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Lligadas, Puig Gerard. "Biobased thermosets from vegetable oils. Synthesis, characterization and properties". Doctoral thesis, Universitat Rovira i Virgili, 2006. http://hdl.handle.net/10803/9007.

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Biobased Thermosets from Vegetable Oils. Synthesis, Characterization, and Properties

Gerard Lligadas Puig

El desenvolupament sostenible va esdevenir com una de les idees claus del segle 20. S'entén per desenvolupament sostenible aquell tipus de desenvolupament que és capaç de satisfer les necessitats actuals sense comprometre els recursos i possibilitats de les futures generacions. Per assolir un desenvolupament sostenible és necessari promoure un desenvolupament social i econòmic pendent en tot moment del medi ambient.

La conservació i la gestió dels residus és especialment important en aquest procés. La creixent demanda de productes derivats del petroli, juntament amb la disminució progressiva de les reserves de petroli són algunes de les moltes raons que han encoratjat la industria química a començar a utilitzar les fonts renovables com a matèria prima.

En aquest context, en els darrers anys l'atenció s'ha centrat en la utilització de recursos anualment renovables, com són els recursos agrícoles, en la producció d'una gran varietat de productes industrials. Un dels recursos renovables més interessants per a la indústria química són els olis vegetals degut a la seva elevada disponibilitat i el seu ampli ventall d'aplicacions. Els olis vegetals formen part de la família de compostos químics coneguts com lípids, i estan constituïts majoritàriament per molècules de triglicèrids. Els triglicèrids estan formats per tres molècules d'àcid gras unides a una molècula de glicerol mitjançant enllaços ester. Els àcids grassos que es troben en la majoria d'olis vegetals estan constituïts per cadenes alifàtiques insaturades de entre 14 i 22 àtoms de carboni.

La explotació industrial dels recursos naturals està actualment en el punt de mira de la comunitat científica. Concretament, el desenvolupament de materials polimèrics derivats de fonts renovables està rebent un interès creixent degut a la incertesa en el preu i les reserves de petroli. La substitució del petroli per productes derivats de fonts renovables és consistent amb el concepte de desenvolupament sostenible.

El propòsit del treball portat a terme en aquesta tesi doctoral va ser desenvolupar nous materials termoestables utilitzant olis vegetals com a productes de partida. En el capítol 1 es discuteix la contribució de la química en el desenvolupament sostenible i es descriuen les possibilitats dels olis vegetals com a productes de partida en la síntesi de materials polimèrics. El capítol 2 descriu la preparació de dos noves famílies de materials híbrids orgànics-inorgànics derivats d'olis vegetals. Es descriu síntesi i caracterització de polímers híbrids derivats d'àcids grassos que contenen dobles enllaços carboni-carboni terminals utilitzant la reacció d'hidrosililació com a reacció d'entrecreuament, i la preparació de polímers derivats d'oli de llinosa epoxidat nanoreforçats amb silsesquioxans polièdrics. En el capítol 3 es descriu la síntesi d'un nou compost fosforat derivat de fonts renovables. Aquest compost s'ha utilitzat com a compost retardant a la flama reactiu en la preparació de resines epoxi derivades de fonts renovables amb propietats de resistència a la flama. La incorporació de fòsfor en resines epoxi d'aquest tipus ha donat lloc a polímers amb bones propietats de resistència a la flama. Finalment, en el capítol 4 es descriu la preparació d'una nova família de polièter poliols derivats d'oleat de metil epoxidat com a font renovable. Aquests poliols s'han utilitzat en la síntesi de poliuretans amb aplicacions específiques: poliuretans que incorporen silici amb propietats de resistència a la flama, i poliuretans segmentats amb aplicacions en biomedicina.

Biobased Thermosets from Vegetable Oils. Synthesis, Characterization, and Properties

Gerard Lligadas Puig

Sustainable development, which became a key idea during the 20th century, may be regarded as the progressive and balanced achievement of sustained economic development, and improved social equity and environmental quality. Sustainable development comprises the three components of society, environment, and economy, and its goals can only be achieved if all three components can be satisfied simultaneously.

The conservation and management of resources is especially important to this process. The growing demand for petroleum-based products and the resulting negative impact on the environment, plus the scarcity of non-renewable resources, are some of the many factors that have encouraged the chemical industry to begin using renewable resources as raw materials.

This situation has led to considerable attention being focused recently on the use of annually renewable agricultural feedstock to produce a wide range of base chemicals and other industrial products. The renewable raw materials that are most important to the chemical industry are natural oils and fats because of their high availability and versatile applications. Vegetable oils constitute about 80% of the global oil and fat production, with 20% (and declining) being of animal origin. The use of these materials offers an alternative approach that is both sustainable and, with the right application, far more environmentally benign than fossil sources.

Vegetable oils and fats form part of a large family of chemical compounds known as lipids. Vegetable oils are predominantly made up of triglyceride molecules, which have the three-armed star structure. Triglycerides comprise of three fatty acids joined at a glycerol junction. Most of the common oils contain fatty acids that vary from 14 to 22 carbons in length, with 0 to 3 double bonds per fatty acid.

Research into the industrial exploitation of products derived from renewable resources is currently of immense international importance. In particular, the development of polymer materials from renewable resources is receiving considerable attention since the availability of crude oil will become severely restricted within the foreseeable future. The replacement of crude oil by renewable raw materials is also consistent with the aim of global sustainability.

The purpose of the study reported in this thesis was to develop new biobased thermosetting polymers from vegetable oils as renewable resources. To achieve this goal, the experimental work focused on exploiting the reactivity of unsaturated fatty compounds. Chapter 1 discusses the contribution of chemistry to sustainable development, and also presents an overview of recent developments in the chemistry of vegetable oil-based polymers. Chapter 2 describes the preparation of two new types of organic-inorganic hybrid materials from vegetable oils. Hybrids with promising properties for optical applications were prepared by the hydrosilylation of alkenyl-terminated fatty acid derivatives with several hydrosilylating agents, and the first example of the preparation of biobased polyhedral oligomeric silsesquioxanes-nanocomposites from vegetable oil derivatives is reported. Chapter 3 describes the synthesis of a new phosphorus-containing fatty acid derivative. This compound is used as a reactive flame-retardant in the preparation of flame-retardant epoxy resins from terminal epoxy fatty acid derivatives. The incorporation of phosphorous into biobased epoxy resins yields polymers with good flame-retardant properties. Finally, chapter 4 describes the preparation of a new family of epoxidized methyl oleate based polyether polyols. These polyols are used in the synthesis of polyurethanes, some with specific applications: silicon-containing polyurethanes with enhanced flame-retardant properties, and polyurethane networks with potential applications in biomedicine.

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Fernandes, Vanda Filipa Silva. "Characterization of biodiesels produced from mixtures of vegetable oils". Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/3141.

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Mestrado em Engenharia Química
Nos últimos anos o biodiesel tem recebido uma atenção notável devido à sua capacidade de substituir os combustíveis fósseis. É considerado um amigo do ambiente, devido às suas imensas vantagens. Este biocombustível é obtido a partir de recursos renováveis, portanto é considerado biodegradável, CO2-neutro, nãotóxico e reduz significativamente as emissões gasosas com efeito de estufa. É composto por uma mistura de ésteres mono alquílicos obtidos a partir de óleos vegetais, tais como, o óleo de soja, óleo de jatropha, óleo de colza, óleo de palma, óleo de girassol ou a partir de outras fontes como a gordura animal (sebo, banha), restos de óleo e gorduras de cozinha. O processo mais comum para a sua produção é através de uma reacção de transesterificação, onde o óleo vegetal reage com um álcool de cadeia curta na presença de um catalisador. Devido às suas propriedades muito semelhantes ao diesel, são mutuamente miscíveis e assim podem ser misturados em qualquer proporção em ordem a melhorar as suas qualidades. O conhecimento das suas propriedades termofísicas como a densidade e viscosidade, que são afectadas pela temperatura, são muito importantes para a indústria automóvel. Contudo, o biodiesel apresenta algumas desvantagens como elevada densidade, viscosidade, ponto de turvação e escoamento/fluxação em comparação com diesel fuel. O seu comportamento a baixas temperaturas limita a sua aplicação em climas frios, sendo que este comportamento é influenciado pelas matérias-primas e álcool utilizado no processo de produção. Os biodieseis obtidos a partir de óleos com grande teor de ácidos gordos saturados induzem a um pior desempenho a baixas temperaturas, visto que são compostos sólidos a temperaturas mais baixas. Neste trabalho, misturas binárias e ternárias de biodiesel de soja, colza e palma, e diesel fuel foram preparadas e medidas as suas viscosidades dinâmicas e densidade em função da temperatura. Para prever as densidades e viscosidades a partir dos compostos puros são utilizadas regras de mistura. O comportamento a baixas temperaturas dos três biodieseis foi estudado. Onde a composição da fase líquida e sólida e a fracção de sólidos a temperaturas abaixo do ponto de turvação foram analisadas. Aplicou-se um modelo termodinâmico para descrever estes sistemas multifásicos e outros sistemas idênticos. Duas versões do modelo preditivo UNIQUAC, juntamente com uma abordagem que assume uma completa miscibilidade dos componentes na fase sólida, são avaliados em relação aos dados de equilíbrio de fases experimentais medidos. ABSTRACT: In recent years, biodiesel has received a notable attention due its ability to replace fossil fuels. It is considered an environmental friendly due their vast advantages. This biofuel is obtained from renewable resources, so it is considered biodegradable, CO2- neutral, non-toxic and significantly reduces the greenhouse gas emissions. It is composed by a mixture of mono alkyl esters obtained from vegetable oil, such as, soybean oil, jatropha oil, rapeseed oil, palm oil, sunflower oil or from other sources like animal fat (beef tallow, lard), waste cooking oil and grasses. The most common process for its production is by a transesterification reaction, where the vegetable oil reacts with a short chain alcohol in presence of a catalyst. Due to its properties very similar to diesel fuel, they are mutually miscible and so can be mixed in any proportion in order to improve its qualities. The knowledge of its thermophysical properties like density and viscosity, which are affected by temperature, is very import for automotive industries. However, biodiesel present some disadvantages like higher viscosity, density, cloud and pour point compared with diesel fuel. Its behaviour at low-temperature limiting its application in cold climate and these behaviour is influenced by raw materials and the alcohol used in production process. The biodiesel obtained from oils with a major level in saturated fatty acids esters induce a worse behaviour at low temperatures, since they are solid compounds at lower temperatures. In this work, binary and ternary blends of biodiesel of soybean, rapeseed and palm, and diesel fuel were prepared and its dynamic viscosities and densities were measured in function of temperature. Mixing rules are used for predicting the densities and viscosities from pure compounds. The low temperature behaviour of three biodiesel was studied. The liquid and solid phase compositions and solid fraction at temperatures below the cloud point were analyzed. A thermodynamic model was applied to describe these multiphase systems and other similar systems. Two versions of the predictive UNIQUAC model along with an approach that assuming complete immiscibility of the compounds in the solid phase are evaluated against the experimental phase equilibrium data measured.

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Valverde, Marlen A. "Green plastics, rubbers, coatings, and biocomposites from vegetable oils". [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3389154.

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Myint, Lay L. "Process analysis and optimization of biodiesel production from vegetable oils". [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1267.

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Gamage, Padmasiri Kankanam. "Use of selected vegetable oils as plasticiser/stabiliser for PVC". Thesis, London Metropolitan University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507082.

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Hu, Chaohe. "Versatile biobased particles of acrylate vegetable oils : Synthesis and applications". Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPAST081.

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Depuis ses débuts, au début des années 1920, l'industrie des polymères dépend fortement des ressources en combustibles fossiles. Environ 4 à 8 % du pétrole, du gaz et de leurs dérivés sont aujourd'hui transformés en matériaux polymères. La plupart d'entre eux sont non recyclables et non dégradables, ce qui entraîne de graves problèmes environnementaux, préjudiciables à la faune et à l'homme. Dans ce contexte, il est nécessaire de développer des produits polymères alternatifs qui, à partir de matières premières renouvelables, présenteront le même niveau de complexité que les produits actuels issus de l'industrie pétrolière.Parmi les différentes matières premières biosourcées utilisées pour fabriquer des matériaux polymères, les huiles végétales sont prometteuses pour leur faible coût et leur dégradabilité intrinsèque, mais aussi parce que leur production est déjà optimisée pour l'industrie alimentaire. L'huile de soja époxydée acrylée (AESO) est un exemple des dérivés d'huiles végétales qui sont utilisés comme additifs plastifiants pour la formulation du PVC. Seule, l'AESO peut être facilement et rapidement polymérisée pour donner un polymère thermodurci. Cependant, en raison de sa viscosité intrinsèque élevée, la plupart des recherches sur les polymères à base d'AESO se sont concentrées jusqu'à présent sur les propriétés de masse, de revêtement ou de film de ce matériau, laissant dans l'ombre la possibilité de fabriquer des matériaux à haute valeur ajoutée.Ce travail se concentre sur la fabrication et l'application des microparticules d'AESO. Nous présentons d'abord une approche simple à travers un mélangeur vortex pour préparer les particules AESO polydispersées basées sur la photopolymérisation en émulsion. Les microparticules AESO synthétisées présentent une bonne dégradabilité dans des conditions chimiques et enzymatiques. Ensuite, nous développons un dispositif microfluidique " one pot " avec une structure de focalisation du flux pour l'émulsification et une zone serpentine pour la réticulation induite par les UV, qui peut être utilisé pour produire en continu des particules AESO monodispersées avec une taille réglable. Nous démontrons également la méthode basée sur les puces microfluidiques modifiées pour préparer les particules non sphériques, où une puce avec une jonction de focalisation d'écoulement en forme de Y est utilisée pour préparer les particules AESO en forme de croissant et une autre puce avec une double jonction de focalisation d'écoulement est utilisée pour synthétiser les particules AESO structurées en coquille de trou. De plus, des microcapsules d'AESO sont fabriquées par la puce personnalisée et elles sont disponibles pour encapsuler des solutions ou des substances aqueuses. Enfin, nous montrons la capacité des microparticules AESO à transporter les molécules organiques dans leurs réseaux réticulés et utilisons des méthodes similaires pour charger les médicaments (curcumine et ibuprofène). Le comportement de libération des médicaments dans le fluide corporel simulé peut être observé, ce qui peut constituer un support prometteur pour d'autres applications pharmaceutiques
Since its beginning, in the early 1920's, polymeric industry relies heavily on fossil fuel resources. Approximately 4%-8% oil, gas and their derivatives are nowadays transformed into polymeric materials. Most of them are non-recyclable and non-degradable, hence leading to serious environmental issues, detrimental to wildlife and humans. In this context, there is a need for the development of alternative polymeric products, which, starting from renewable commodities, will share the same level of complexity than current ones derived from oil industry.Among the various bio-sourced raw products used to make polymeric materials, vegetable oils are promising for their low cost and intrinsic degradability, but also because their production is already optimized for the food industry. Acrylated epoxidized soybean oil (AESO) is one example of the vegetable oil derivatives that are used as e.g. plastifying additives for the formulation of PVC. Alone, AESO can be readily and rapidly polymerized to give a thermoset polymer. However, as a consequence of its high intrinsic viscosity, most of the research on AESO-based polymer so far is only focused on the bulk, coating or film properties of this material, leaving the possibility to fabricate high added value materials a blind spot.Herein, this work focuses on the fabrication and application of the AESO microparticles. We first present a simple approach through a vortex mixer to prepare the polydispersed AESO particles based on the emulsion photopolymerization. The synthesized AESO microparticles present a good degradability in the chemical and enzymatic conditions. Then, we develop a “one pot” microfluidic device with a flow-focusing structure for emulsification and the serpentine zone for UV-induced reticulation, which can be used to continuously product the monodispersed AESO particles with a tunable size. We also demonstrate the method base on the modified microfluidic chips to prepare the non-spherical particles, where a chip with Y-shape flow-focusing junction is used to prepare the crescent-shaped AESO particles and another chip with a double flow-focusing junction is utilized to synthesize the hole-shell structured AESO particles. In addition, AESO microcapsules are fabricated by the customized chip, and they are available to encapsulate the aqueous solutions or substances. Finally, we show the ability of AESO microparticles to carry the organic molecules into their crosslinked networks and use the similar methods to load the drugs (curcumin and ibuprofen). The release behavior of drugs in simulated body fluid can be observed, which may be act as a promising drug carrier for further pharmacy applications

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Libri sul tema "Vegetable oils"

S, Mkamilo G., a cura di. Vegetable oils. Wageningen: PROTA Foundation, 2007.

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Krist, Sabine. Vegetable Fats and Oils. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-30314-3.

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H, Benedict J., Treacy M. F. 1957-, Kinard David H. 1945-, Cotton Foundation (Memphis, Tenn.) e National Cottonseed Products Association, a cura di. Vegetable oils and agrichemicals. Memphis, Tenn., U.S.A: Cotton Foundation, 1994.

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Barry, Rossell, a cura di. Vegetable oils and fats. Surrey: Leatherhead Food Research Association, 1999.

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Franks, Jo. Vegetable oil greats. [S.l.]: Emereo Publishing, 2013.

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Gunstone, Frank D., a cura di. Vegetable Oils in Food Technology. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9781444339925.

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Z, Erhan Sevim, a cura di. Industrial uses of vegetable oils. Champaign, Ill: AOCS Press, 2005.

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Dineen, Jacqueline. Vegetables and oils. Brighton: Young Library, 1987.

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Dineen, Jacqueline. Vegetables and oils. Hillside, N.J: Enslow Publishers, 1988.

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Dimitrios, Boskou, e American Oil Chemists' Society, a cura di. Olive oil: Chemistry and technology. 2^a ed. Champaign, Ill: AOCS Press, 2006.

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Capitoli di libri sul tema "Vegetable oils"

Hertrampf, Joachim W., e Felicitas Piedad-Pascual. "Vegetable Oils". In Handbook on Ingredients for Aquaculture Feeds, 415–44. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4018-8_45.

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Camin, Federica, e Luana Bontempo. "Edible Vegetable Oils". In Food Forensics, 257–72. Boca Raton, FL : CRC Press, 2017. | “ A Science Publishers book ”.: CRC Press, 2017. http://dx.doi.org/10.1201/9781315151649-11.

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Yuliani, Sri, e Bhesh Bhandari. "Vegetable Parts, Herbs, and Essential Oils". In Handbook of Vegetables and Vegetable Processing, 369–85. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9780470958346.ch18.

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Yuliani, Sri, Bhesh Bhandari e Fatima Sultana. "Vegetable Parts, Herbs, and Essential Oils". In Handbook of Vegetables and Vegetable Processing, 889–914. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119098935.ch38.

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Firestone, D., e R. J. Reina. "Authenticity of vegetable oils". In Food Authentication, 198–258. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1119-5_7.

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Chandran, Janu, Nayana N e P. Nisha. "Phenolics in Vegetable Oils". In Phenolic Compounds in Food, 407–14. Boca Raton : CRC Press, Taylor & Francis Group, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/9781315120157-21.

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Farooq, Saba, e Zainab Ngaini. "Introduction to Vegetable Oils". In Vegetable Oil-Based Composites, 1–20. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9959-0_1.

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Butterwick, Michael, e Edmund Neville-Rolfe. "Vegetable Oils and Oilseeds". In Agricultural Marketing and the EEC, 208–17. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003395812-12.

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Kant, Rajni, e Keshav Kant. "Biodiesel from Vegetable Oils". In Renewable Fuels, 131–57. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003200123-4.

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Karim, Nur Azwani Ab, Noor Hidayu Othman e Masni Mat Yusoff. "Vegetable Oil". In Recent Advances in Edible Fats and Oils Technology, 101–40. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5113-7_4.

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Atti di convegni sul tema "Vegetable oils"

Saparin, Norliza, Syed Mohd Hadi Syed Hilmi e Rahmat Ngteni. "Contaminants in Vegetable Oils". In Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists’ Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.557.

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Дельмухаметов, А. Б., e Ю. А. Ромашова. "VEGETABLE OILS IN FISH FEED". In DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE. ООО "ДГТУ-Принт" Адресс полиграфического предприятия 344003 пл Гагарина, зд. 1, 2023. http://dx.doi.org/10.23947/aquaculture.2023.34-37.

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The article attempts to briefly review the articles devoted to the use of vegetable oils in the production of fish feed. Vegetable oils can be possible substitute for fish oil. In general, it is possible to replace 50-60% of the fish oil in the feed with a vegetable oil. In some cases, apparently, it is possible to completely replace fish oil with vegetable oil without affecting the health of the fish and the quality of the final product.

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Grigoriev, A. YA, I. N. Kavaliova, J. Padgurskas e R. Kreivaitis. "Tribotechnical Properties of Edible Vegetable Oils". In BALTTRIB 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/balttrib.2015.02.

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The basic mechanical and tribotechnical properties of olive, corn, sunflower, rapeseed oils and mineral oil I-20 were determined. It is found that mechanical properties of oils are comparable or better to properties of I-20, as well as their load-carrying capacity meet or exceed up to 60 %, antiwear properties are more effective of 1.3-2.3 times, load wear index is higher by 2.3 times. According to tribological characteristics, the oils are ranked from best to worst as follows: olive, corn, rapeseed and sunflower.

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Karaosmanoglu, F., M. Tuter, A. Ozgulsun e E. Gollu. "HEATING PROPERTIES OF USED VEGETABLE OILS". In Energy and the Environment, 1998. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/1-56700-127-0.630.

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Erhan, S. Z., A. Adhvaryu e Z. Liu. "Chemical Modification of Vegetable Oils for Lubricant Basestocks". In ASME 2003 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ices2003-0595.

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Use of vegetable oil based lubricants will reduce petroleum imports and have a favorable environmental impact. The vegetable oils are derived from a renewable sources, biodegradable, non-toxic, possess high flash points and have low volatility. Inadequate oxidative stability and poor low-temperature properties of vegetable oils limit their utilization as lubricants. In this study, we report the development of chemical modification methods to improve these functional properties. The resultant vegetable oil derivatives having diester substitution at the sites of unsaturation shows comparable properties to mineral base fluids.

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Puscas, Cosmina L., Geza Bandur, Dorina Modra e Remus Nutiu. "Considerations About Using Vegetable Oils in Lubricants". In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63838.

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New lubricating oils obtained from mixtures of synthetic diesters (di-2-ethylhexyl-adipate (DOA) and di-2-ethylhexyl-sebacate (DOS)) and vegetable oils (sunflower, SFO, soybean, SO and rapeseed oil, RO) are studied. The characteristics of all these mixtures are given together with differential scanning calorimetry (DSC) and thermal gravimetric (TG) analyses.

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Sharma, Brajendra, e Derek Vardon. "Biobased emulsions for lubrication applications". In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/vyab9723.

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Vegetable oil-based oil-in-water emulsions have been evaluated for their potential application as metalworking fluids. A variety of vegetable oils, including chemically modified vegetable oils, are used in this study. Additionally, several surfactants including both commercial and lab synthesized were tested. They had HLB values ranging from 9-13.1 and were evaluated for their ability to obtain emulsions suitable enough for lubrication applications. The epoxidized oils were found to form stable oil-in-water emulsions using several different surfactant systems. It was found that surfactants with an HLB value slightly over 9 work well with vegetable oils to form stable emulsions. The lubricant performance of these emulsions, studied using the 4-ball test method, showed that even 1% emulsions of the vegetable oils are effective lubricants.

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Cavarzere, A., M. Morini, M. Pinelli, P. R. Spina, A. Vaccari e M. Venturini. "Fuelling Micro Gas Turbines With Vegetable Oils: Part II — Experimental Analysis". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68239.

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The application of bio-fuels in automotive, power generation and heating applications is constantly increasing. However, the use of straight vegetable oil (pure or blended with diesel) to feed a gas turbine for electric power generation still requires experimental effort, due to the very high viscosity of straight vegetable oils. In this paper, the behavior of a Solar T-62T-32 micro gas turbine fed by vegetable oils is investigated experimentally. The vegetable oils are supplied to the micro gas turbine as blends of diesel and straight vegetable oils in different concentrations, up to pure vegetable oil. This paper describes the test rig used for the experimental activity and reports some experimental results, which highlight the effects of the different fuels on micro gas turbine performance and pollutant emissions. Moreover, an identification model is set up to predict the behavior of the considered gas turbine, when fuelled by vegetable oil, and the sensitivity of micro gas turbine thermodynamic measurements and emissions is quantitatively established.

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Grushcow, J. "High Oleic Plant Oils With Hydroxy Fatty Acids for Emission Reduction". In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63515.

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The lubricating properties of vegetable oil are well known. However, with the advent of petroleum oils, castor oil and other vegetable oils fell out of favor. The quality of petroleum oils has improved significantly in the last few years with the introduction of Group III base oils. However, even Group III oils fall short of the inherent lubricity of vegetable oils. Analogous to advances in petroleum oils, improvement of vegetable oils by genetic modification to obtain high oleic oils has led to better acceptance of these oils as lubricants. Studies have shown significant reduction in tail pipe emissions when using these types of oils in an engine crank case. We have successfully expressed a hydroxylase gene in a high oleic canola variety. The combination of a high oleic background and hydroxy fatty acids produced an oil with properties that improve further on high oleic oils. The presence of the hydroxy group provides improved lubricity. This technology will allow us to create oils with varying hydroxy fatty acid content depending on the application. These applications can range from use in lubricants, as chemical feedstocks, and reactive components in polymers.

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Babu, A. K., e G. Devaradjane. "Vegetable Oils as Fuel for Diesel Engines: An Overview". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39051.

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The intent of this paper is to summarize the state of knowledge on use of vegetable oils as diesel fuels. Fuel related properties are reviewed and compared with conventional diesel fuel. The use of neat vegetable oil (edible and/or nonedible), biodiesel and its blends in a diesel engine has been discussed. Performance and emission characteristics are highlighted. Suitability of different combustion chambers for diesel engine operation with vegetable oils is outlined. Techniques to decrease viscosities are discussed. An overview on current developments on the use of vegetable oils directly and indirectly in diesel engines is presented.

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Rapporti di organizzazioni sul tema "Vegetable oils"

NELYUBINA, E., E. BOBKOVA e I. GRIGORYANTS. STUDYING THE RANGE OF VEGETABLE OILS. Science and Innovation Center Publishing House, 2022. http://dx.doi.org/10.12731/2070-7568-2022-11-2-4-7-14.

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Vegetable oil is a daily food product, on the quality of which our health depends. It is not only a building and energy material, but also exhibits functional properties. Vegetable oil occupies the main share of the domestic market of oil and fat products. At catering establishments, vegetable oil is used to prepare various dishes, the requirements for these products are quite high, so the company often faces the question of which vegetable oils to use? which of them have the best qualities? These are the questions we tried to solve in our work. Purpose - of the research work is to study the range of vegetable oil from the product supplier MARR RUSSIA LLC and conduct a commodity assessment of the quality of sunflower oil used at the enterprises of Samara. Results: based on the results of the study, the assortment composition of vegetable oil was analyzed at the supplier of products LLC “MARR RUSSIA”, a commodity characteristic of sunflower oil samples was carried out and recommendations for purchase were given.

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Henna, Phillip H. Novel Bioplastics and biocomposites from Vegetable Oils. Office of Scientific and Technical Information (OSTI), gennaio 2008. http://dx.doi.org/10.2172/939375.

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Mailer, Rodney, e STEFAN GAFNER. Olive Oil Laboratory Guidance Document. ABC-AHP-NCNPR Botanical Adulterants Prevention Program, marzo 2021. http://dx.doi.org/10.59520/bapp.lgd/evfu8793.

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Extra virgin olive oil is often described as the healthiest of all commercially available edible oils. Olive oil has a high percentage of monounsaturated fat and because it is generally consumed in the unrefined (virgin) crude state, the oil contains natural compounds which would otherwise be removed in refining. The high value of the virgin oil compared to refined seed oils make it highly susceptible to adulteration. This laboratory guidance document provides a review of (1) analytical methods used to determine whether olive products have been adulterated and, if so, (2) methods to identify the adulterants. As olive oil is frequently diluted with undeclared refined olive oil or degraded virgin olive oil, methods have been established to determine the quality of the oil’s freshness and compliance with international standards. Adulteration has also been observed in various vegetable oils including canola (Brassica napus, Brassicaceae), sunflower (Helianthus annuus, Asteraceae), and other oils. This document should be viewed in conjunction with the corresponding Botanical Adulterants Prevention Bulletin on olive oil published by the ABC-AHP-NCNPR Botanical Adulterants Prevention Program.

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Kalu, E. Eric, e Ken Shuang Chen. Final report on LDRD project : biodiesel production from vegetable oils using slit-channel reactors. Office of Scientific and Technical Information (OSTI), gennaio 2008. http://dx.doi.org/10.2172/928823.

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Smith, G. V., R. D. Gaston, Ruozhi Song e Jianjun Cheng. Desulfurization of coal with hydroperoxides of vegetable oils. [Quarterly] report, September 1--November 30, 1994. Office of Scientific and Technical Information (OSTI), dicembre 1994. http://dx.doi.org/10.2172/32792.

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Policy Support Activity, Myanmar Agriculture. Monitoring the agri-food system in Myanmar: Understanding the rapid price increase of vegetable oils. Washington, DC: International Food Policy Research Institute, 2022. http://dx.doi.org/10.2499/p15738coll2.135868.

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Smith, G. V., R. D. Gaston, R. Song, J. Cheng, Feng Shi e K. L. Gholson. Desulfurization of coal with hydroperoxides of vegetable oils. Technical progress report, March 1--May 31, 1995. Office of Scientific and Technical Information (OSTI), dicembre 1995. http://dx.doi.org/10.2172/205592.

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Smith, G. V., R. D. Gaston, Ruozhi Song, Jianjun Cheng, Feng Shi, K. L. Gholson e K. K. Ho. Desulfurization of coal with hydroperoxides of vegetable oils. [Quarterly progress report], December 1, 1994--February 28, 1995. Office of Scientific and Technical Information (OSTI), dicembre 1995. http://dx.doi.org/10.2172/207069.

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Smith, G. V., R. D. Gaston, R. Song, J. Cheng, F. Shi e Y. Wang. Desulfurization of Illinois coals with hydroperoxides of vegetable oils and alkali. Technical report, September 1--November 30, 1995. Office of Scientific and Technical Information (OSTI), dicembre 1995. http://dx.doi.org/10.2172/257330.

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Smith, G. V., R. D. Gaston, R. Song, J. Cheng, F. Shi e Y. Wang. Desulfurization of Illinois coals with hydroperoxides of vegetable oils and alkali, Quarterly report, March 1 - May 31, 1996. Office of Scientific and Technical Information (OSTI), dicembre 1996. http://dx.doi.org/10.2172/477628.

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