共查询到19条相似文献,搜索用时 63 毫秒
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《精细化工原料及中间体》2014,(12)
正目前国内外生产棕榈酸异辛酯的方法为化学法,即棕榈酸和异丙醇在高温、高压下,以硫酸、三氯乙酸等为催化剂,反应生成棕榈酸异辛酯,能耗大,产品颜色较深,反应转化率约为85%~92%本成果采用棕榈酸和异辛醇在脂肪酶催化下合成棕榈酸异辛酯,与化学法相比具有以下优点:1常 相似文献
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《精细化工原料及中间体》2010,(1)
目前国内外生产棕榈酸异辛酯的方法为化学法,即棕榈酸和异丙醇在高温、高压下,以硫酸、三氯乙酸等为催化剂,反应生成棕榈酸异辛酯,能耗大,产品颜色较深,反应转化率约为85%~92%本成果采用棕榈酸和异辛醇在脂肪酶催化下合 相似文献
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陈红 《化学工业与工程技术》2006,27(4):15-17
在减压条件下以氨基磺酸为催化剂合成了棕榈酸异辛酯。探讨了原料配比、催化剂用量、反应时间、反应温度等因素对酯化率的影响。确定了最佳工艺条件,并考察了催化剂重复使用效果。 相似文献
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该项目建立了一条脂肪酶催化棕榈油甘油解制备单甘酯的工艺路线。筛选出最佳酶源BUCT—11及相应的无机类载体作为脂肪酶固定化载体,并采用结晶法进行纯化。得到的单甘酯含量>90.0%,产品性能指标达到FCC标准。目前,单甘油酯主要采用化学法生产,能耗大、反应产物易降解、分离提纯困难。该工艺有望取代化学法过程。 相似文献
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非水相酶催化合成L-抗坏血酸棕榈酸酯 总被引:2,自引:0,他引:2
研究了不同脂肪酶在有机溶剂体系中催化合成L-抗坏血酸棕榈酸酯,确定了较有效的脂肪酶和溶剂体系,对影响产物浓度的几种主要因素进行了讨论,确定最适反应条件为叔丁醇为溶剂、催化剂Novozyme435脂肪酶的质量浓度10g·L-1、底物棕榈酸与Vc摩尔比3∶1、反应温度59℃和反应时间50h。纯化后产物的纯度可达95%。 相似文献
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Mateus V. C. Silva Cintia M. R. Rosa Leandro G. Aguiar Pedro C. Oliveira Heizir F. de Castro Larissa Freitas 《化学工程与技术》2020,43(9):1741-1748
Penicillium camemberti lipase immobilized on a magnetized poly(styrene-co-divinylbenzene) was used as a biocatalyst for isopropyl palmitate synthesis. The reaction conditions were determined by 22 factorial central composite design. A mathematical model based on a simplified kinetic approach was developed to describe the system and validated with the experimental data. An assay carried out in a stirred-tank reactor confirmed the proposed model. The ester was purified and the properties such as density and water content were similar to those found in commercially available isopropyl palmitate. 相似文献
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Luciana Santibáñez Lorena Wilson Andrés Illanes 《Journal of the American Oil Chemists' Society》2014,91(3):405-410
Synthesis of ascorbyl palmitate by enzymatic esterification of palmitic acid and ascorbic acid was conducted in an organic medium with Pseudomonas stutzeri lipase TL immobilized in different supports and its performance was compared with commercial Novozym 435 lipase used as a reference. The enzyme was immobilized in different supports and the best catalyst was selected in terms of immobilization yield and mass specific activity to perform the reactions of synthesis. Synthesis of ascorbyl palmitate was optimized considering temperature, substrate molar ratio and enzyme to limiting substrate mass ratio as variables, and substrate conversion and specific productivity as evaluation parameters. The best reaction conditions for immobilized lipase TL were 55 °C, 1:5 ascorbic to palmitic acid molar ratio, and 1:10 lipase to ascorbic acid mass ratio, obtaining 57 % substrate conversion and a specific productivity of 0.013 [g ascorbic acid/(g enzyme × min)]; the best conditions for Novozym 435 were 70 °C, ascorbic to palmitic acid molar ratio 1:10, and 1:10 lipase to ascorbic acid mass ratio, obtaining 51 % substrate conversion and a specific productivity of 0.016 [g ascorbic acid/(g enzyme × min)]. 相似文献
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酶法合成果糖棕榈酸酯 总被引:1,自引:0,他引:1
以固定化脂肪酶Novozyme435为催化剂,分子筛为除水剂,叔戊醇和丁酮为溶剂,研究了用果糖和棕榈酸生成果糖棕榈酸酯的反应。考察了叔戊醇、丁酮、叔戊醇与丁酮混合溶剂和果糖与棕榈酸摩尔比对产物浓度的影响。实验结果表明,较好的合成条件为果糖与棕榈酸的摩尔比1∶2,叔戊醇占混合溶剂体积总量的40%,0.1 g酶,4A型分子筛适量,反应温度60℃,摇床转速180 r/min。反应12 h后产物浓度达37.7 g/L,果糖转化率达到92.1%,棕榈酸转化率为72.2%。与单一溶剂相比,在混合溶剂中反应,可提高果糖溶解度,增加酶活,缩短反应时间。 相似文献
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