Bibliographies thématiques / Superheated water hydrolysis

Littérature scientifique sur le sujet « Superheated water hydrolysis »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Superheated water hydrolysis"

1

Bhavsar, Parag, Marina Zoccola, Alessia Patrucco, Alessio Montarsolo, Giorgio Rovero et Claudio Tonin. « Comparative study on the effects of superheated water and high temperature alkaline hydrolysis on wool keratin ». Textile Research Journal 87, no 14 (7 juillet 2016) : 1696–705. http://dx.doi.org/10.1177/0040517516658512.

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The purpose of this work is to understand the impact of superheated water hydrolysis treatment on the chemical properties of wool, and compare it with a conventional method of alkaline hydrolysis. The effects of hydrolysis temperature and concentration of alkali on the properties of wool were investigated. Superheated water hydrolysis was carried out at the temperatures of 140℃ and 170℃, with a material to liquor ratio of 1:3 for 1 hour. In conventional alkaline hydrolysis, the experiments were carried out in the same conditions using potassium hydroxide (KOH) and calcium oxide (CaO) with a concentration in the range of 5%–15% on the fiber weight (o.w.f.). The effects of hydrolysis temperature and alkali concentrations on wool properties were checked using optical and scanning electron microscopy. It was observed that the hydrolyzates obtained in both cases contained low molecular weight proteins and amino acids. Both the hydrolysis processes resulted in degradation of the wool fibers. However, superheated steam hydrolysis is an environmentally friendly and less expensive process, as it is performed using water as a solvent. The wool hydrolyzates produced using superheated water hydrolysis could find a potential application in agriculture, such as fertilization, soil improvement and suchlike.
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Bhavsar, Parag, Tudor Balan, Giulia Dalla Fontana, Marina Zoccola, Alessia Patrucco et Claudio Tonin. « Sustainably Processed Waste Wool Fiber-Reinforced Biocomposites for Agriculture and Packaging Applications ». Fibers 9, no 9 (1 septembre 2021) : 55. http://dx.doi.org/10.3390/fib9090055.

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In the EU, sheep bred for dairy and meat purposes are of low quality, their economic value is not even enough to cover shearing costs, and their wool is generally seen as a useless by-product of sheep farming, resulting in large illegal disposal or landfilling. In order to minimize environmental and health-related problems considering elemental compositions of discarded materials such as waste wool, there is a need to recycle and reuse waste materials to develop sustainable innovative technologies and transformation processes to achieve sustainable manufacturing. This study aims to examine the application of waste wool in biocomposite production with the help of a sustainable hydrolysis process without any chemicals and binding material. The impact of superheated water hydrolysis and mixing hydrolyzed wool fibers with kraft pulp on the performance of biocomposite was investigated and characterized using SEM, FTIR, tensile strength, DSC, TGA, and soil burial testing in comparison with 100% kraft pulp biocomposite. The superheated water hydrolysis process increases the hydrophilicity and homogeneity and contributes to increasing the speed of biodegradation. The biocomposite is entirely self-supporting, provides primary nutrients for soil nourishment, and is observed to be completely biodegradable when buried in the soil within 90 days. Among temperatures tested for superheated water hydrolysis of raw wool, 150 °C seems to be the most appropriate for the biocomposite preparation regarding physicochemical properties of wool and suitability for wool mixing with cellulose. The combination of a sustainable hydrolysis process and the use of waste wool in manufacturing an eco-friendly, biodegradable paper/biocomposite will open new potential opportunities for the utilization of waste wool in agricultural and packaging applications and minimize environmental impact.
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Rajabinejad, Hossein, Marina Zoccola, Alessia Patrucco, Alessio Montarsolo, Giorgio Rovero et Claudio Tonin. « Physicochemical properties of keratin extracted from wool by various methods ». Textile Research Journal 88, no 21 (31 juillet 2017) : 2415–24. http://dx.doi.org/10.1177/0040517517723028.

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Keratin from wool fibers was extracted with different extraction methods, for example oxidation, reduction, sulfitolysis, and superheated water hydrolysis. Different samples of extracted keratin were characterized by molecular weight determination, FT-IR and NIR spectroscopy, amino acid analysis, and thermal behavior. While using oxidation, reduction, and sulfitolysis, only the cleavage of disulfide bonds takes place; keratin hydrolysis leads to the breaking of peptide bonds with the formation of low molecular weight proteins and peptides. In the FT-IR spectra of keratoses, the formation of cysteic acid appears, as well as the formation of Bunte salts (–S–SO3–) after the cleavage of disulfide bonds by sulfitolysis. The amino acid composition confirms the transformation of amino acid cystine, which is totally converted into cysteic acid following oxidative extraction and almost completely destroyed during superheated water hydrolysis. Thermal behavior shows that keratoses, which are characterized by stronger ionic interaction and higher molecular weight, are the most temperature stable keratin, while hydrolyzed wool shows a poor thermal stability.
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Wang, Zhi-liang, Jia-li Xu, Lian-jia Wu, Xin Chen, Shu-guang Yang, Hui-chao Liu et Xian-ju Zhou. « Dissolution, hydrolysis and crystallization behavior of polyamide 6 in superheated water ». Chinese Journal of Polymer Science 33, no 9 (15 juillet 2015) : 1334–43. http://dx.doi.org/10.1007/s10118-015-1682-3.

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Bhavsar, Parag, Marina Zoccola, Alessia Patrucco, Alessio Montarsolo, Raffaella Mossotti, Giorgio Rovero, Mirco Giansetti et Claudio Tonin. « Superheated Water Hydrolysis of Waste Wool in a Semi-Industrial Reactor to Obtain Nitrogen Fertilizers ». ACS Sustainable Chemistry & ; Engineering 4, no 12 (6 octobre 2016) : 6722–31. http://dx.doi.org/10.1021/acssuschemeng.6b01664.

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Bhavsar, Parag S., Giulia Dalla Fontana et Marina Zoccola. « Sustainable Superheated Water Hydrolysis of Black Soldier Fly Exuviae for Chitin Extraction and Use of the Obtained Chitosan in the Textile Field ». ACS Omega 6, no 13 (24 mars 2021) : 8884–93. http://dx.doi.org/10.1021/acsomega.0c06040.

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Ludyn, A. M., et V. V. Reutskyy. « Receiving triacetin from sunflower oil ». Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 24, no 98 (21 octobre 2022) : 44–49. http://dx.doi.org/10.32718/nvlvet-f9809.

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One of the promising types of vegetable raw materials in Ukraine, which can be used for the development of resource-saving technologies, are vegetable oils. The products of their processing serve as raw materials for obtaining surface-active substances, which are used in the production of food additives, pharmaceutical products, detergents and cosmetics, biofuels and additives. The most common oil in Ukraine is sunflower, which, like other vegetable oils, can be processed to form fatty acids and their salts. The initial process of vegetable oil processing is hydrolysis. The technological parameters of the sunflower oil hydrolysis process under different conditions were studied. It was investigated that the alkaline hydrolysis of sunflower oil in the presence of sodium hydroxide proceeds the fastest in comparison with thermal methods in the presence of sulfuric acid and superheated steam, the conversion of raw materials reaches 100 % in the 25th minute of the experiment, at a process temperature of 60 °C. The waste in this process is a glycerol solution, which can be used to obtain its esters for the purpose of implementing a zero-waste technology scheme. A method of using sunflower oil hydrolysis waste is proposed, which consists in its esterification with acetic acid, as a result of which triacetin is formed – a valuable product for use in many sectors of the national economy. In the food industry, triacetin is known as a food additive under the code E1518, which is used as a humectant and stabilizer to preserve freshness, as a plasticizer and binder thickener, as a solvent and odor fixer. Due to its ability to be broken down into its components – glycerol and acetic acid and absorbed without any side effects in the human body, triacetin is safe for use. It was investigated that the esterification reaction between the waste product of the hydrolysis of vegetable oil – a solution of glycerin in water and acetic acid took place at a conversion of raw materials of 100 %, while the selectivity of the target product remained constant at the level of 80 %. At the same time, the concentration of the glycerol solution did not affect either the amount of conversion or the value of selectivity. As a catalyst in this process, p-toluenesulfonic acid was used in a relatively small amount – 1.0 % by volume, so it did not significantly affect the composition of the reaction products, and this, in the future, makes it possible to conduct the process without additional purification from traces of the catalyst.
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Bhavsar, Parag, Giulia Dalla Fontana, Claudio Tonin, Alessia Patrucco et Marina Zoccola. « Superheated water hydrolyses of waste silkworm pupae protein hydrolysate : A novel application for natural dyeing of silk fabric ». Dyes and Pigments 183 (décembre 2020) : 108678. http://dx.doi.org/10.1016/j.dyepig.2020.108678.

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Zhang, Yuanyuan, Lai Wei, Xin Gao, Heng Chen, Qiubai Li, Kai Zhang et Qilong Huang. « Performance Analysis of a Waste-to-Energy System Integrated with the Steam–Water Cycle and Urea Hydrolysis Process of a Coal-Fired Power Unit ». Applied Sciences 12, no 2 (15 janvier 2022) : 866. http://dx.doi.org/10.3390/app12020866.

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An innovative hybrid energy system consisting of a waste-to-energy unit and a coal-fired power unit is designed to enhance the energy recovery of waste and decrease the investment costs of waste-to-energy unit. In this integrated design, partial cold reheat steam of the coal-fired unit is heated by the waste-to-energy boiler’s superheater. The heat required for partial preheated air of waste-to-energy unit and its feedwater are supplied by the feedwater of CFPU. In addition, an additional evaporator is deployed in the waste-to-energy boiler, of which the outlet stream is utilized to provide the heat source for the urea hydrolysis unit of coal-fired power plant. The stand-alone and proposed designs are analyzed and compared through thermodynamic and economic methods. Results indicate that the net total energy efficiency increases from 41.84% to 42.12%, and the net total exergy efficiency rises from 41.19% to 41.46% after system integration. Moreover, the energy efficiency and exergy efficiency of waste-to-energy system are enhanced by 10.48% and 9.92%, respectively. The dynamic payback period of new waste-to-energy system is cut down from 11.39 years to 5.48 years, and an additional net present value of $14.42 million is got than before.
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