共查询到18条相似文献,搜索用时 93 毫秒
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超临界流体中的酶催化反应 总被引:6,自引:0,他引:6
介绍了在超临界流体中进行酶催化反应的优越性及一些研究成果,如酶在超临界流体中的稳定性及其影响因素,并对超临界流体和有机溶剂中的酶反应作了比较。 相似文献
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介绍了超临界流体中化学反应的特点及基础理论研究,简要评述了超临界流体作为反应介质的酶催化反应、超临界水氧化反应、金属有机反应和超临界流体作为反应原料的超临界CO2、超临界CO加氢反应。 相似文献
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Mahesh N. Varma 《Fuel》2010,89(7):1641-31
Biodiesel was synthesized in supercritical fluids by two routes: non-catalytically in supercritical alcohols and by enzyme catalysis in supercritical carbon dioxide. Two oils, sesame oil and mustard oil, and two alcohols, methanol and ethanol, were used for the synthesis. Complete conversion was observed for synthesis in supercritical alcohols whereas only a maximum of 70% conversion was observed for the enzymatic synthesis in supercritical carbon dioxide. For the synthesis in supercritical alcohols, the activation energies and pseudo-first order rate constants were determined. For the reactions in supercritical carbon dioxide, a mechanism based on ping pong bi-bi was proposed and the kinetic parameters were determined. 相似文献
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超临界流体技术及其在生物工程中的应用 总被引:23,自引:0,他引:23
介绍了在生物工程有着广泛的应用前景的多种超临界流体技术,包括提取生物活性物质的超临界流体萃取,超临界条件二氧化碳中制备手性药物制备和淀粉水解制取葡萄糖的非水酶催化反应,超临界水条件下纤维素水解制备葡萄糖,超临界流体中的细胞破碎,制备缓释药物和色说载体的超临界流体溶液快速膨胀和气体抗溶剂结晶和沉淀技术。 相似文献
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Antonia P. de los Ríos Francisco J. Hernndez-Fernndez Demetrio Gmez Manuel Rubio Francisca Toms-Alonso Gloria Víllora 《The Journal of Supercritical Fluids》2007,43(2):303
The synthesis of butyl propionate in a recirculating bioreactor in room temperature ionic liquid/supercritical carbon dioxide biphasic systems at 50 °C and 80 bar was studied. In these systems, α-alumina microporous membranes with immobilized Candida antarctica lipase B were coated with four different ionic liquids based on 1-n-alkyl-3-imidazolium cations and hexafluorophosphate and bis{(trifluoromethyl)sulfonyl}imide anions. Selectivity increased (reaching >99.5%) when room temperature ionic liquid/supercritical carbon dioxide biphasic systems were used rather than in supercritical carbon dioxide alone. To understand the behaviour of the enzyme and the mass-transfer phenomena in these biphasic systems, the reaction was also carried out in ionic liquids and in ionic liquid/hexane biphasic systems, and the ionic liquid/hexane partition coefficients of the compounds involved in the transesterification reaction were determined. It was observed that the activity in room temperature ionic liquid/supercritical carbon dioxide biphasic systems depends on the effect of the ionic liquid media on the enzyme and the diffusional limitations across the IL-layer around the biocatalyst. 相似文献