Bibliographies thématiques / ECO- FRIENDLY REACTION MEDIA

Littérature scientifique sur le sujet « ECO- FRIENDLY REACTION MEDIA »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "ECO- FRIENDLY REACTION MEDIA"

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Lusiana, Retno Ariadi, Rahmad Nuryanto, Nor Basid Adiwibawa Prasetya, Resa Putri Sherina et Dilla Dayanti. « Eco-Friendly Chitosan-Based Biodiesel Heterogeneous Catalyst Support Membrane ». Jurnal Kimia Sains dan Aplikasi 26, no 2 (20 janvier 2023) : 39–49. http://dx.doi.org/10.14710/jksa.26.2.39-49.

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A chitosan-polyvinyl pyrrolidone K-30 (Cs-PVP.K30) membrane was prepared as a heterogeneous catalyst supporting membrane in the transesterification process in the production of biodiesel from palm oil and methanol through the blend reaction between chitosan (Cs) and polyvinyl pyrrolidone K-30 polymer (PVP K-30). Several membranes were characterized by their physicochemical and catalytic properties. Based on physicochemical data, it was found that including the carbonyl group from PVP K-30 into the chitosan framework correlated with an increase in porosity, hydrophilicity, water absorption, and the degree of swelling of the membrane. The results of the analysis using Fourier Transmittance Infra-red (FTIR) showed the spectra of carbonyl (-C=O) and hydroxyl (-OH) groups at wavenumbers 1648 cm-1 and 3363 cm-1, which shows that the reaction of chitosan alloy with PVP K-30 has been successfully carried out. The catalytic site of the Cs-PVP K30-NaOH membrane in the biodiesel production process was studied under several conversion conditions. It was found that the conversion of biodiesel reached 93.90% with a reaction time of 90 minutes, a temperature of 65°C, and an oil/methanol mole ratio of 1:7.
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Yadav, J. S., et H. M. Meshram. « Green twist to an old theme. An eco-friendly approach ». Pure and Applied Chemistry 73, no 1 (1 janvier 2001) : 199–203. http://dx.doi.org/10.1351/pac200173010199.

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Owing to present environmental awareness, attempts are being made toward the evolution of environmentally benign processes using solid-supported reagents and microwave-assisted reactions. A newly developed, nonmetallic oxidative reagent, "clayan", has been exploited for various reactions such as deprotection, oxidation, oxidative coupling, and nitration and bromination of activated and deactivated arenes. In another green chemistry endeavor, reactions such as reduction and cyclization have been successfully carried out in dry media under microwave irradiation. The nonsolvent reaction, experimental simplicity, and enhanced selectivity are the main attractive features of the approach.
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Eshetu, Gebrekidan Gebresilassie, Michel Armand, Hiroyuki Ohno, Bruno Scrosati et Stefano Passerini. « Ionic liquids as tailored media for the synthesis and processing of energy conversion materials ». Energy & ; Environmental Science 9, no 1 (2016) : 49–61. http://dx.doi.org/10.1039/c5ee02284c.

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Radatz, Cátia Schwartz, Liliana do Amaral Soares, Estéfano Roberto Vieira, Diego Alves, Dennis Russowsky et Paulo Henrique Schneider. « Recoverable Cu/SiO2 composite-catalysed click synthesis of 1,2,3-triazoles in water media ». New J. Chem. 38, no 4 (2014) : 1410–17. http://dx.doi.org/10.1039/c3nj01167d.

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Shim, Jae Ho, Seok Hyun Cheun, Hyeon Soo Kim et Deok-Chan Ha. « Enantioselective Organocatalyzed Michael Addition of Isobutyraldehyde to Maleimides in Aqueous Media ». Molecules 27, no 9 (25 avril 2022) : 2759. http://dx.doi.org/10.3390/molecules27092759.

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Thiourea was introduced into (R,R)-1,2-diphenylethylenediamine as an organocatalyst to promote the reaction between isobutyraldehydes and maleimides. Enantioselective Michael addition reaction was carried out as an eco-friendly method using water as the solvent. As a result of the reaction between isobutyraldehyde and maleimide, ≥97% yield and 99% enantioselectivity were obtained at a low catalyst loading of 0.01 mol%. The solvent effect can be explained by theoretical calculations that indicate the participation of a transition state, in which the CF3 substituent of the catalyst is a hydrogen bond activated by the surrounding water molecules. This discovery enabled the use of low catalyst loading in the organic reactions of chiral substances for pharmaceutical applications. Furthermore, a solvent effect for Michael reaction of the organocatalysts was proposed, and the organic reaction mechanisms were determined through quantum calculations.
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Shim, Jae Ho, Seok Hyun Cheun, Hyeon Soo Kim et Deok-Chan Ha. « Enantioselective Organocatalyzed Michael Addition of Isobutyraldehyde to Maleimides in Aqueous Media ». Molecules 27, no 9 (25 avril 2022) : 2759. http://dx.doi.org/10.3390/molecules27092759.

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Thiourea was introduced into (R,R)-1,2-diphenylethylenediamine as an organocatalyst to promote the reaction between isobutyraldehydes and maleimides. Enantioselective Michael addition reaction was carried out as an eco-friendly method using water as the solvent. As a result of the reaction between isobutyraldehyde and maleimide, ≥97% yield and 99% enantioselectivity were obtained at a low catalyst loading of 0.01 mol%. The solvent effect can be explained by theoretical calculations that indicate the participation of a transition state, in which the CF3 substituent of the catalyst is a hydrogen bond activated by the surrounding water molecules. This discovery enabled the use of low catalyst loading in the organic reactions of chiral substances for pharmaceutical applications. Furthermore, a solvent effect for Michael reaction of the organocatalysts was proposed, and the organic reaction mechanisms were determined through quantum calculations.
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Bhatt, Nikita, Smriti, Richa Khare et Monika Kamboj. « Suzuki-Miyaura Cross Coupling Reaction in Various Green Media ». Asian Journal of Chemistry 33, no 9 (2021) : 1976–84. http://dx.doi.org/10.14233/ajchem.2021.22584.

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Suzuki-Miyaura cross-coupling reaction is an efficient and utilized method for the direct formation of carbon-carbon bonds. The effectiveness and efficiency of Suzuki-Miyaura cross-coupling reaction and its applications have been the topic of interest for synthetic chemists for the last few decades. Green chemistry is the area where we use eco-friendly products. Suzuki coupling includes palladium or nickel catalyzed coupling reaction, which involves ester of boric acids or simply boric acids with the organic halides or pseudohalide. In recent years, these catalytic systems have been developed in a green environment for Suzuki reaction (Suzuki-Miyaura cross-coupling reaction). This review epitomizes the Suzuki-Miyaura cross-coupling reaction using efficient catalysts in various green media.
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Gao, Li Ya, Xue Jun Tan, Wei Xue, Dong Sheng Zhang, Xin Qiang Zhao et Yan Ji Wang. « An Eco-Friendly Catalytic Route for One-Pot Synthesis of Phenols from Aromatics and Hydroxylamine ». Advanced Materials Research 781-784 (septembre 2013) : 163–68. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.163.

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A series of ionic liquids were used as a co-solvent in the reaction of one-pot synthesis of phenols from aromatics and hydroxylamine. Then an eco-friendly catalytic system, i.e., [HSO3-bmi [CF3SO3]-H2O-HAc media with (NH4)6Mo7O24·4H2O catalyst, was designed for the reaction. The results showed that aromatics were successfully hydroxylated to give the corresponding phenols. Recycling experiments suggested that the catalytic system was stable enough to be recycled.
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Rehman, Khalil ur, Shaista Airam, Long Song, Jian Gao, Qiang Guo, Yukun Xiao et Zhipan Zhang. « MnS-Nanoparticles-Decorated Three-Dimensional Graphene Hybrid as Highly Efficient Bifunctional Electrocatalyst for Hydrogen Evolution Reaction and Oxygen Reduction Reaction ». Catalysts 10, no 10 (3 octobre 2020) : 1141. http://dx.doi.org/10.3390/catal10101141.

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The search for renewable energy resources has attracted considerable research interests in electrochemical reactions of hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) that are essential for fuel cells. Earth-abundant, eco-friendly and cost-effective transition metal compounds are emerging candidates as electrocatalysts in these reactions. Herein, we report the growth of manganese sulfide nanoparticles on three-dimensional graphene, through an easy, progressive successive ionic layer adsorption and reaction (SILAR) method, where manganese sulfide nanoparticles (MnS-NPs), diameter of 4–5 nm are homogeneously decorated on the 3D graphene matrix. The formed hybrid shows improved HER activity in 0.1 M KOH when compared to bulk MnS. Moreover, MnS-NPs@3DG is also active in catalyzing ORR, qualifying it as a new type of bifunctional electrocatalyst in alkaline media.
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Naeimi, Hossein, et Vajihe Nejadshafiee. « Efficient one-pot click synthesis of β-hydroxy-1,2,3-triazoles catalyzed by copper(i)@phosphorated SiO2via multicomponent reaction in aqueous media ». New J. Chem. 38, no 11 (2014) : 5429–35. http://dx.doi.org/10.1039/c4nj00909f.

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Thèses sur le sujet "ECO- FRIENDLY REACTION MEDIA"

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Ghosh, Sujit. « Greener approach towards arganic tranformation : application of transition metal catalysts and eco friendly reaction media ». Thesis, University of North Bengal, 2016. http://ir.nbu.ac.in/handle/123456789/2481.

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Dubey, Satya P. « Mathematical modelling and simulation of continuous, highly precise, metal/eco-friendly polymerization of Lactide using alternative energies for reaction extrusion ». Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/11253.

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Polylactic acid (PLA) is one of the most promising bio-compostable and biodegradable thermoplastic made from renewable sources. PLA, is typically obtained by polymerising lactide monomer. The technique mainly used for ring opening polymerization (ROP) of Lactide is based on metallic/bimetallic catalyst (Sn, Zn, and Al) or other organic catalysts in suitable solvent. However, the PLA synthesized using such catalysts may contain trace elements of the catalyst, which may be toxic. In this work, reactive extrusion experiments using stannous octoate Sn(Oct)2 and tri-phenyl phosphine (PPh)3 were considered to perform ROP of lactide monomer using ultrasound as an alternative energy (AE) source for activating and/or boosting the polymerization. Mathematical model of ROP of lactide, was developed to estimate the impact of reaction kinetics and AE source on the polymerization process. Ludovic® software, a commercial code was used. It was adopted for the simulation of continuous reactive extrusion of PLA. Results from experiments and simulations were compared to validate the simulation methodology. Results indicate that the application of AE source in reaction process boost the PLA formation rate. Result obtained through Ludovic simulation and experiments were validated. It was shown that there is a case for reducing the residence time distribution (RTD) in Ludovic due to the ‘liquid’ monomer flow in the extruder. This change in the parameters resulted in validation of the simulation. However, it was concluded that the assumption would have to be established by doing further validations. The simulation model includes the details of kinetics of reactions involved with in the process and helps to upscale the reaction output. This work also estimates the usefulness and drawbacks of using different catalysts as well as effect of alternative energies and future aspects for PLA production.
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Schulz, Anika. « Supercritical carbon dioxide as a green media for simultaneous dyeing and functionalisation : A study on disperse dyeing and silicone functionalisation for water repellency of polyester fabric ». Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-21947.

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Textile processing methods such as conventional exhaustion dyeing, pre-treatments and printing consume high amounts of water and use partly toxic and hazardous chemicals which are non-degradable. These chemicals (e.g. excess amount of dye, additives and catalysts) remain partially in the waste-water which is drained out and ends up polluting the environment. The supercritical carbon dioxide dyeing technology presents an eco-friendly and water-free method with reduced use of chemicals and energy. The benefits of such technology are currently not overcoming the relative high investment costs which impede its full implementation into the textile industry. This study presents an approach to extent the application of the eco-friendly supercritical carbon dioxide technology. It combines the well-studied supercritical carbon dioxide dyeing process for polyester with the functionalisation process to obtain water repellent surface properties. As water repellent (substance) environmentally benign silicones are used. Results showed that the simultaneous dyeing and functionalisation process was feasible assessed by the compatibility of the dye and silicone in the system. Silicone and dye did not interfere in each other’s functionality (colour strength and water contact angle). Further the process temperature and silicone molecular weight showed no influence on the colour strength of the fabric whereas the water contact angle (water repellence) increased with increasing temperature. The resulting polyester fabric showed acceptable colour strength yet did not obtain sufficient water repellent properties despite the increase in water contact angle of the treated samples to the untreated reference sample. The poor water repellence is suggested to be caused by the hydrophobic functional groups of the silicones oriented towards each other rather than toward the outer fabric surface. Overall the thesis is promoting research which combines eco-friendly technologies including environmental benign chemicals for the textile industry. Silicones are widely used in textile processing not only as water repellents, but also as anti-foaming agents, lubricants and softeners. Therefore a water-free and eco-friendly application method can benefit a wide range of finishing processes.
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Chapitres de livres sur le sujet "ECO- FRIENDLY REACTION MEDIA"

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Armiun, Maryam, Seyed Mojtaba Taghizadeh et Hamid Mobedi. « Investigation of In Situ Systems of Progesterone in Biphasic Media ». Dans Eco-friendly and Smart Polymer Systems, 64–66. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45085-4_16.

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Marefat Seyedlar, Roghayyeh, Mohammad Imani et Seyed Mojtaba Mirabedini. « Chemical Modification of Polyfurfuryl Alcohol Resin Using Maleic Anhydride : FTIR Study of a Diels-Alder Reaction ». Dans Eco-friendly and Smart Polymer Systems, 243–46. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45085-4_58.

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Liu, Y., Y. Zhuge et W. Duan. « Reusing Alum Sludge as Cement Replacement to Develop Eco-Friendly Concrete Products ». Dans Lecture Notes in Civil Engineering, 75–82. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_10.

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AbstractAlum sludge is a typical by-product of the water industry. The traditional sludge management method, disposing of sludge in landfill sites, poses a critical environmental and economic concern due to a significant increase in sludge amount and disposal cost. In this paper, the feasibility of reusing sludge as cement replacement is investigated, and the physical performance and microstructure modification of concrete products made with sludge is discussed. The obtained results indicated that a satisfying pozzolanic reactivity of sludge after calcination at high temperatures and grinding to the appropriate size was identified. When 10% cement was replaced with sludge, the reaction degree of sludge was up to 39%, and the obtained concrete blocks exhibited superior mechanical performance. Based on the microstructural analysis, e.g., x-ray diffraction, thermogravimetric analysis, and advanced nanoindentation method, the high aluminum content in sludge was incorporated into C–(A)–S–H gel; the original “Al-minor” C–(A)–S–H gel in pure cement paste was converted to ‘Al-rich’ C–(A)–S–H gel. Also, sludge promoted the formation of aluminum-bearing hydrates, such as ettringite and calcium aluminate hydrates (C–A–H). Although the Al incorporation had no significant effect on the hardness and modulus of C–(A)–S–H gel, the homogeneous mechanical properties (hardness and modulus measured with nanoindentation) of binder paste degraded with increasing sludge ash content above 10%, attributing to the lower hardness of unreacted sludge than cement clinker and the relatively lower reaction degree. Using sludge in concrete products offers an economical and environmentally friendly way to dispose of sludge and preserve diminishing natural resources. Also, the reduction of cement usage may contribute to achieving carbon neutrality.
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Jaini, Azila, Wan Farha Wan Zulkiffli et Mohammad Ismail. « The Impact of Eco-Friendly Products and Social Media Toward Environmental Awareness : Moderating Role of Knowledge ». Dans The Importance of New Technologies and Entrepreneurship in Business Development : In The Context of Economic Diversity in Developing Countries, 491–504. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69221-6_37.

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Radjai, Manelle, Hana Ferkous, Meriem Zerroug, Souad Djellali, Mohamed Aymen Chaouch, Bilal Hattabi, Hatem Majdoub et Mokhtar Boutahala. « Methanolic Extract of Artemisia Herba Alba as Eco-Friendly Inhibitor of Carbon Steel Corrosion in 1M HCl Media ». Dans Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1379–81. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_403.

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Christian, Michael, Lasmery R. M. Girsang, Henilia Yulita, Sunarno Sunarno, Oktafalia Marisa Muzammil et Pangestu Arifin. « Do Women Consider Purchasing Eco-Friendly Beauty Products ? An Examination of Personal Motivations and Perceived Social Media Marketing ». Dans Technology : Toward Business Sustainability, 291–302. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-54009-7_27.

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Kouzu, Masato. « Eco-Friendly Production of Biodiesel by Utilizing Solid Base Catalysis of Calcium Oxide for Reaction to Convert Vegetable Oil into Its Methyl Esters ». Dans Zero-Carbon Energy Kyoto 2009, 20–28. Tokyo : Springer Japan, 2010. http://dx.doi.org/10.1007/978-4-431-99779-5_3.

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Devkate, Chandrashekhar, Satish Kola, Mohammad Idrees, Naqui J. Siddiqui et Roshan D. Nasare. « Eco-Friendly, Green Approach for Synthesis of Bio-Active Novel 3-Aminoindazole Derivatives ». Dans Green Computing Technologies and Computing Industry in 2021. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95565.

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In present chapter we have reported green and highly efficient method for synthesize novel series of substituted -1H-indazol-3-amine derivative (3a-h) by cyclocondensation reaction of substituted benzonitrile (1a-h) and substituted Hydrazine (2a-h) using ceric (IV) ammonium nitrate (CAN) as a catalyst, EtOH-H2O as a ecofriendly media and reaction was carried out under ultrasound irradiation green method. The structures of newly synthesized indazole derivative (3a-h) were corroborated through spectral investigation such as elemental analysis and spectral studies like IR, C13 NMR, Mass spectra and 1H NMR. The compounds were assessed for their in-vitro antimicrobial activity with pathogenic microbe comprising Gram positive bacterial strains, S. aureus and Gram negative strains E.coli, P.vulgaris, and S. typhi at different concentration. The consequence of bioassay is compared with standard drug Chloramphenicol.
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Sasi, Renjith, S. L. Sreejith et Roy Joseph. « Ionic Liquids for the Surface Modification of Polymers and Medical Devices ». Dans Ionic Liquids : Eco-friendly Substitutes for Surface and Interface Applications, 354–79. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136234123010019.

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Ionic liquids (ILs) attracted global attention owing to their superior functional properties, making them useful for many applications. Low volatility, wide liquidity range, better miscibility with organic and inorganic materials, better electrochemical stability, and negligible toxicity earn them a green solvent status. ILs are suitable alternatives to many volatile and flammable organic solvents that chokes our environment. The presence of asymmetric organic/inorganic ions gave them unique characteristics similar to biomolecules. They could interact with the cell membranes and penetrate the lipid bilayers to destroy bacterial cell membranes. They can selfassemble at the interfaces of polar and non-polar media. The nature of substrates, concentration, counter-ions, and polarity of the medium influence the extent and stability of the self-assembly. The self-assembled monolayers (SAMs) and multilayers of ILs impart intriguing properties to the surfaces. Surface modification with ILs is preferred over other methods considering their eco-friendly nature. The IL-mediated surface modification would help to improve the surface properties of polymers, metals, nanoparticles, ceramics, stones, medical devices, etc. The modified surfaces would have improved wettability, biocompatibility, and antimicrobial or antiviral properties. IL-modified surfaces could anchor enzymes to generate sustainable biocatalysts for a wide range of reactions. The inherent affinity of ILs towards gases like CO2 makes them suitable for generating gas-adsorbing surfaces. Assembled charge carriers in ILs are helpful in energy storage and electrochemical sensing applications. Poly(ionic liquids) (PILs) are also receiving much attention recently since they display synergistic properties of polymers and ILs to be employed in divergent fields. PILs are also suitable for the surface modification of different substrates. This chapter reviews the surface modification of materials using ILs and PILs and their biomedical applications.
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Sharma, Chikanshi, Madhu Kamle et Pradeep Kumar. « Applications of Nanoparticles and Nanomaterials in Bioremediation for Environmental Safety : An Overview ». Dans Nanoparticles as Sustainable Environmental Remediation Agents, 1–28. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837670215-00001.

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The impact of human activities on the environment and ecosystems is constantly and dangerously growing due to the increase in global population and the ensuing use of primary resources and waste generation. An important issue affecting our globe currently that cannot be ignored is environmental pollution caused by human activity. The development of new eco-friendly, sustainable, and financially sound methods to clean up the polluted environment is one of the most difficult challenges of the twenty-first century. Nanoparticles (NPs) have distinctive features, such as catalytic capacity, ease of operation, possibility to chemically modify their properties, reactivity, and high surface area. Nanotechnologies and nanomaterials (NMs) hold potential for the development of sustainable, cutting-edge, creative products and methods for environmental bioremediation. Filtration, absorption, photocatalysis, chemical reactions and adsorption are some methods that are commonly used in environmental remediation to remove contaminants from various environmental media like air, soil and water. The most current advancements in environmental recovery tactics for contaminated areas using nanoparticles in conjunction with bioremediation methods are covered in this review. It is discussed how these nanoparticles can be used to remove various environmental pollutants, including heavy metals, halogenated herbicides, dyes, volatile organic compounds, organophosphorus compounds, and chlorinated organic chemicals. To promote the most recent research on and innovation in sustainable techniques in the field of environmental bio-remediation, special attention is paid to eco-friendly and regenerable nano-solutions and their safe-by-design qualities.
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Actes de conférences sur le sujet "ECO- FRIENDLY REACTION MEDIA"

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Kosović Perutović, M., Z. Leka, M. Bigović, J. Mišurović et V. Medojević. « Mechanochemistry : optimization of the synthesis of dithiocarbamate derivatives ». Dans 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.249kp.

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As a continuation of our research in the field of synthesis and characterization of dithiocarbamate (DTC), we are developing mechanochemical protocols for the synthesis of new compounds with potential biological activity. Optimizing the methods of obtaining desired compounds is of special importance for a completely eco-friendly science, and one of the prospective strategies is mechanochemistry, recognized as a green, sustainable synthesis method. Herein we present the mechanochemical reactions of homopiperazine and CS2. The aim was to obtain homopiperazine dithiocarbamate derivative through mechanochemical synthesis. The optimization of the process was carried out through mechanochemical grinding in the planetary ball-mill using zirconium oxide grinding media (jars and balls), under various reaction conditions. The selected reactions were conducted using a one-pot method. Chemical and spectral characterization revealed that the product was obtained in the form of a dimer with a good yield. Water and NaHCO3 were generated as by-products. Homopiperazine-1,4-bis-carbodithioate was synthesized for the first time in a ball-mill under mechanochemical and solvent-free conditions. This protocol is promising and thus constitutes an appealing alternative both in academic research and in practical processes, being simple to perform, cheap, scalable, and occurring under mild conditions.
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Ramasamy, Jothibasu, et Mohammad K. Arfaj. « Sustainable and Eco-Friendly Drilling Fluid Additives Development ». Dans International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22455-ms.

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Abstract Drilling fluid is an inseparable component of drilling oil and gas wells and circulated from the day of spudding to the day of completing a well. Drilling fluid consists of a variety of chemicals to provide various properties to drilling fluid such as viscosity, fluid loss control, emulsion stability, lubricity, etc. Developing chemicals that are eco-friendly and sustainable to provide the above-mentioned properties to drilling fluid is a significant step forward taken towards sustainability and reducing carbon footprint besides suitability for aquifers and offshore environments. Several fatty acid-based products play a crucial role in drilling fluids additives development as fatty acids offer eco-friendly and bio-degradable properties. Triglycerides present in vegetable oil is a potential source of fatty acids and their derivatives. Used cooking oil (UCO) provides a perpetual and sustainable source of raw material for various types of eco-friendly additives development. Used cooking oil is subjected to simple chemical modification of base hydrolysis process and mixture of fatty acids have been obtained after completing a sequence of clean-up process of reaction mixture. The fatty acids obtained are eco-friendly, bio-degradable and non-toxic. Due to technical, economic and environmental benefits, we have conducted several research projects to develop various chemicals from used cooking oil for oil and gas field applications. Fatty acid-based products mainly used in drilling fluids as lubricants to reduce torque and drag for water-based mud. In case of oil-based mud systems, fatty acid derived products are used as emulsifiers, wetting agents and rheology modifiers. However, these products have been either mixture of fatty acids and their derivatives or only derivatives of fatty acids. In our study, we have used the mixture of fatty acids obtained from chemical conversion of UCO for applications as lubricant for water-based mud and emulsifier and rheology modifier for invert emulsion oil-based mud systems. This paper describes the chemicals process for converting used cooking oil to fatty acids by base hydrolysis reaction in the first section. Application of synthesized fatty acids for water-based and oil-based mud formulation as lubricants, emulsifiers and rheology modifiers have been discussed in the second part of the paper.
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Bezerra, Natércia M. M., Everaldo F. Santos-Filho, Jokderlea C. Sousa, Paulo H. Menezes et Roberta A. Oliveira. « Environmentally Friendly Homocoupling Reaction of Functionalized Potassium Aryltrifluoroborates Salts in Aqueous Media ». Dans 14th Brazilian Meeting on Organic Synthesis. São Paulo : Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0272-2.

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Sabnis, Sandeep P., et Srinivas Seethamraju. « Dry Reforming of Biogas to Syngas : An Eco-Friendly Renewable Fuel for I C Engines ». Dans ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24559.

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Abstract Biogas, a promising alternative fuel, a substitute for fossil fuels, is predominantly a mixture of methane and carbon dioxide. Both are major greenhouse gases. Methane has a long-term effect on the environment while carbon dioxide is recycled by the plants. Hence, capture and burning of biogas to consume methane as a fuel is desired both from energy and environmental outlook. The presence of a large amount of carbon dioxide in biogas, however, impairs combustion in engines resulting into slow burning and higher hydrocarbon and carbon monoxide emissions. Dry reforming, a conversion process of biogas to synthesis gas (syngas), a mixture of hydrogen and carbon monoxide, is a catalytic process that has the potential to greatly improve biogas combustion in engines. The researchers’ focus in dry reforming, however, has been for the generation of hydrogen for fuel cells and reactants for Fischer Tropsch process in industry — this approach aims towards maximum conversion of methane and carbon dioxide. The work presented here investigates the possibility of partial conversion of biogas to harness maximum energy and reduce emissions from I.C. Engines. The published research on dry reforming of biogas has examples of high concentrations of methane in the syngas with calorific values suitable for I.C. Engine application. For example, a 50:50 v/v CH4/CO2 composition biogas has calorific value of 13.33 MJ/kg which when converted to a syngas at 550°C results in a gas with 18:42:14:26 v/v CO2/CH4/H2/CO and a calorific value of 19.96 MJ/kg). Such compositions have moderate percentage of hydrogen to act as combustion enhancer and the carbon dioxide present helps to control NOx emissions. The major contributors of energy are methane and carbon monoxide in these cases. The dry reforming reaction is an endothermic reaction, which produces hydrogen. The side reactions that happen are the reverse water gas shift reaction, which reduces hydrogen yield and the Bouduard reaction which results in carbon deposition on the catalyst surface. The reactor conditions need to be chosen appropriately, especially the reactor temperature. Simulation of dry reforming reaction using a process simulation software (Aspen Plus) is carried out to find the extent of conversion and exit syngas composition for different biogas compositions. The endothermic heat for the reactor can be provided by the heat of the engine exhaust — therefore, an opportunity exists to use waste heat recovery from the engine exhaust. However, there is a tradeoff between the reactor temperature, syngas composition going to engine inlet and the engine exhaust heat — which is investigated in this study.
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Harmon, Jennifer, Jung Eun Lee et Iva M. Jestratijevic. « Relationship of Social Media, Social Influences & ; Eco-Friendly Behaviors for Gen Y vs. Z ». Dans Breaking Boundaries. Iowa State University Digital Press, 2022. http://dx.doi.org/10.31274/itaa.13833.

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Ali, Tahseen R., Taghried A. Salman et Mahdi S. Shihab. « Pomelo leaves extracts characterization and utilization as eco friendly corrosion inhibitor for carbon steel in different condition acidic media ». Dans PROCEEDING OF THE 1ST INTERNATIONAL CONFERENCE ON ADVANCED RESEARCH IN PURE AND APPLIED SCIENCE (ICARPAS2021) : Third Annual Conference of Al-Muthanna University/College of Science. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0093372.

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Harmon, Jennifer, et Jung Eun Lee. « Social Influences and Social Media Engagement Effects on Eco-Friendly Behaviors in Gen Y & ; Z : Moderating Effects of Personality ». Dans Innovate to Elevate. Iowa State University Digital Press, 2022. http://dx.doi.org/10.31274/itaa.15888.

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Birichevskaya, L. L., M. A. Vinter, A. A. Doroshevich, M. А. Khancheuski, E. I. Kvasyuk et A. I. Zinchenko. « SYNTHESIS OF THE MODIFIED NUCLEOSIDE 8-BROMADENOSINE AND ITS PHOSPHOLIPID DERIVATIVE ». Dans SAKHAROV READINGS 2021 : ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2021. http://dx.doi.org/10.46646/sakh-2021-2-20-23.

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Modified nucleoside 8-bromoadenosine possessing high reactive capacity may serve as a basic compound for the synthesis of a large number of purine antimetabolites showing potentially therapeutic activities toward several tumor and viral diseases. In this study, 8-bromoadenosine was produced by a simple eco-friendly procedure following the treatment of nucleoside precursor adenosine with aqueous bromine solution. In the course of enzymatic transphosphatidylation reaction, the first synthesis of phospholipid derivative of the above-mentioned nucleoside -5‘-(1,2-dimyristoyl phosphatidyl)-8-bromoadenosine was accomplished. Novel compounds may presumably act as non-toxic progenitors of bioactive antimetabolites to be used in drug formulas.
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Ramasamy, Jothibasu, et Mohammad K. Arfaj. « Sustainable and Green Drilling Fluid Additives Development ». Dans Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31350-ms.

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Abstract Oil and gas drilling requires several components work simultaneously to ensure smooth and safe drilling. Drilling fluid or mud is an inseparable part of drilling oil and gas wells and circulated through out theh drilling operation. Drilling fluid contains a variety of additives or chemicals to provide various properties to drilling fluid namely viscosity, fluid loss control, emulsion stability, lubricity, etc. Developing environment friendly chemicals to provide the above-mentioned drilling fluid properties is a significant step taken towards sustainability and reducing carbon footprint besides suitability for aquifers and offshore environments. Several fatty acid-based chemicals used in drilling fluids as fatty acids offer eco-friendly and bio-degradable properties besides required drilling fluid properties. Vegatable oil contains triglycerides which is a potential source of fatty acids and their derivatives. Waste vegetable oil (WVO) provides a perpetual and sustainable source of raw material for various types of eco-friendly additives development. Waste vegetable oil is subjected to simple chemical modification of base hydrolysis process and mixtures of fatty acids have been obtained after finishing a sequence of clean-up process of reaction mixture. The fatty acids obtained are environment-friendly, bio-degradable and non-toxic. Due to technical, economic and environmental advantages of products derived from waste vegetable oils, we have undertaken several research projects to produce various chemicals from waste vegetable oil for oil and gas field applications. Fatty acid-based products mainly used in drilling fluids as lubricants to reduce torque and drag for water-based mud. In case of oil-based mud systems, fatty acid derived products are used as emulsifiers, wetting agents and rheology modifiers. However, these products have been either mixture of fatty acids and their derivatives or only derivatives of fatty acids. In our study, we have used the mixture of fatty acids obtained from chemical conversion of WVO for applications as lubricant for water-based mud and emulsifier and rheology modifier for invert emulsion oil-based mud systems. In this paper, we described the chemicals process for converting waste vegetable oil to fatty acids by base hydrolysis reaction in the first section. Application of synthesized fatty acids for water-based and oil-based mud formulation as lubricants, emulsifiers and rheology modifiers have been discussed in the second part of the paper.
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Rezaei Koochi, Mojtaba, Seyedsaeed Mehrabi-Kalajahi, Mikhail Alekseevich Varfolomeev, Vladislav Vladimirovich Savelev, Eduard Rishadovich Ziganshin, Rail Ilgizarovich Kadyrov, Insaf Nakipovich Shamanov et Ranel Ilnurovich Galeev. « Induced Thermal Shocking by BiMTheCh Technology as a New Approach for Enhanced Oil Recovery from Tight Reservoirs with Heavy Oil ». Dans SPE Russian Petroleum Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/206414-ms.

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Abstract This work is devoted to investigate the ability of thermal shocking to create fractures in rock samples and thermal cracking of heavy crude oil structure. In order to study the thermobaric characterizations of catalytic and thermal decomposition reaction of binary mixture (BM), a series of experiments was designed in high-temperature and high-pressure reactor (HTHP) and the time to reach the maximum temperature and pressure were monitored. Before and after the experiments, core samples were scanned by 4D tomography. In addition, SARA analysis was done to study the effect of thermal shocking on heavy oil composition. The results showed that using BiMTheCh, the temperature in the reaction zone was increased up to 273 °C during very short time (2 seconds) after activation of the reaction. Either, the pressure was increased up to 129 atm. As results showed, the simultaneous sudden increase in temperature and pressure creates a thermal shock which reduces breakdown pressure from 235 to 12 atm. Computed scanning tomography results confirmed formation of new fractures on the surface of core samples. Results of the SARA analysis also confirmed that the molecular structure of heavy oil due to the binary mixture's reaction was changed. Sharp increase in pressure and temperature induced transformation of heavy components of crude oil such as asphaltenes into lighter components such as saturates. Generally, the binary mixture technology can be used as a new high-efficient and eco-friendly technology for enhanced heavy oil recovery from tight heavy oil reservoirs.
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