Journal of Materials Research and Technology-JMR&T
·
2020
·
IF 5.289
Wenchao Wang,Fashe Li,Ying Li
The main shortcomings of biodiesel are related to the low-temperature performance and oxidation stability. Hence, this study proposes to investigate the influence of the oleic acid-based esters with various linear and branched chain alcohols on these two properties of biodiesel. The economic impact of biodiesel with various compositions is also evaluated by means of a mathematical model. The results showed that the longer the carbon chain length of the alcohol component, the better the low-temperature performance of the biodiesel. Hence, the cold filter plugging point and solidifying point of methyl oleate were −19 and −24 °C, respectively, whereas the cold filter plugging point and solidifying point of amyl oleate were −36 and −41 °C, respectively. The more irregular the molecular structure, the better the low-temperature performance of oleic acid-based lipids. For instance, the condensate point and solidifying point of oleic acid-based esters with branched chain alcohols should be lower than oleic acid-based esters with linear chain alcohols. On the other hand, for the linear esters of oleic acid, the oxidation stability is better as the carbon chain is longer. For instance, the induction period of methyl oleate is 0.07 h while for amyl oleate, it is 0.36 h, which corresponds to an increase of about 5 times. For the branched esters, although they are sensitive to oxidation, the induction period is higher than that of methyl oleate. Finally, the DEA evaluation model was used to analyze the economic aspects of the resulted biodiesel. The results showed that the addition of ethyl oleate to biodiesel significantly improved the low-temperature performance and oxidation stability of biodiesel with good economic benefits.
研究领域:
能源科學
·
化學工程
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 10
·2053
·
IF 4.967
Jijuan Zhang,Hongfei Huo,Lei Zhang,Yang Yang,Hongchen Li,Yi Ren,Zhongfeng Zhang
Cellulose has attracted considerable attention as the most promising potential candidate raw material for the production of bio-based polymeric materials. In the last decade, significant progress has been made in the production of biopolymers based on different cellulose forms. In this study, cellulose was obtained in an innovative and environmentally friendly way, using boxwood powder. Crude cellulose was obtained by treatingBuxuspowder with an ethanol–acetic acid–water mixture. Refined cellulose was then obtained by treatment with an acidic sodium hypochlorite solution and alkaline hydrogen peroxide solution. The novel chemistry of cellulose prepared by this method promises to be not only green, but also highly desirable, because of its lower emissions and low cost. It is crucial for the future of the global polymer industry. The refined cellulose was subjected to a high-temperature hydrothermal treatment under two temperatures and time conditions, with temperature gradients of 120, 140, and 160 °C, and time gradients of 1, 2, and 3 h. The samples were subjected to infrared and thermogravimetric analyses. The cellulose undergoes dehydration and thermal degradation reactions during the heat treatment process, and the thermal stability of the residual is enhanced, compared with that of virgin cellulose. Between 120 and 140 °C, the hydroxyl and hypomethyl groups on the surface of cellulose are shed. Groups in the amorphous region of the polymer are the first to be shed. The dehydration reaction reduces the number of free hydroxyl groups on the surface of the cellulose molecules. The dehydration reaction was accelerated by an increase in temperature. Between 140 and 160 °C, the β-(1,4)-glycosidic bond begins to slowly break and some furans are generated. The structure of cellulose undergoes reorganization during thermal treatment. The thermal stability of the modified material is greater than that of untreated cellulose.
研究领域:
材料科學
·
生物化學
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Maida Akhlaq,Maliha Uroos
Phosphonium-based ionic liquids are considered superior over others imidazolium- and pyridinium-based ionic liquids (ILs) due to their stability, availability and low cost. Among phosphonium ILs, tetrabutylphosphonium (TBP)-based ILs exhibit exciting properties which make them potential candidate for academic and industrial applications. The most influential characteristics of TBP-based ILs are excellent thermal and chemical stability, affordability, faster rate, high polarity and viscosity. Their misibility with water make them even more attractive as solvents for dissolution of recalcitrant structures, enzymatic hydrolysis and extraction of biomolecules. In electrochemistry, high conductivities and wide electrochemical window make them credible electrolyte material in supercapacitor batteries. Additionally, they are slowly gaining the ground of conventional organic solvents and catalysts as greener alternatives. The most significant application of TBP-based ILs is CO 2 absorption, the proton-donating capacity of TBP cation allows the stable ylide formation and facilitates the CO 2 sorption. All in all, the outstanding physiochemical properties and applications of TBP-based ILs provide fundamental understanding of these ILs with future rational design to explore them further in many different industrial, chemical and biological fields.
研究领域:
化學
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環境科學
·
生物技術
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 58
·期 10
·5144-5153
·
IF 3.3
Ping Xu,Mengxue Xu,Zia-ud Din,Xi Chen,Yuehui Wang,Kun Zhuang,Qi Zhang,Xianhui Chang,Lei Chen,Wenping Ding
Summary Fresh wet Dousi (FWD) is a traditional Chinese food made from rice and beans through wet milling and dry heating. However, its drawback of storage stability at low temperatures (4 °C) challenges the market development. Thus, soy protein isolate (SPI) was incorporated to improve its structure, starch retrogradation and water distribution. SPI reduced FWD's peak viscosity, trough viscosity, final viscosity and setback values. Additionally, the hardness, retrogradation enthalpies (ΔH), crystallinity and infrared absorbance ratio at 1047/1022 cm −1 and 995/1022 cm −1 of FWD decreased significantly after adding SPI. From the rheological, LF-NMR and SEM results, SPI was favourable to the formation of porous and flexible structure within FWD. The variation of food structure improved the binding ability of starch or other components with water. This work indicated that SPI could improve the low-temperature stability of FWD by enhancing the water capability, inhibiting the starch retrogradation, and promoting structural compliance within the network.
研究领域:
食品科学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Li Li Zhang,Yu Hong Chen,Li Min Qi
The dispersion stability of silicon carbide whisker (SiCw) which is by-product of SiC was researched using distilled water as dispersing medium, polyethylene imine (PEI), tetramethylammonium hydroxide (TMAH), poly(meth)acrylamide (PMAM) as the dispersants. The sedimentation and optical microscope technology are used to observe whisker dispersion ，FTIR and ZETA electric potential are used to explore its dispersion mechanism . The results show that the order of dispersion capacity of the dispersant was PEI> TMAH> PMAM.When 1.25vol% PEI was used as dispersant, SiCw can be dispersed homogeneously at pH=9 and 10, in the meanwhile, if TMAH was used, the added amount would be 0.75vol% in which the pH is in range of 11-12.
研究领域:
材料科學
·
化學工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）