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在氯化亚锡作为催化剂的条件下,以癸二酸与月桂醇为原料合成了癸二酸月桂醇酯。对其合成工艺条件进行了探索和优化,优化的最佳反应条件是癸二酸、月桂醇摩尔比为1∶3.0,催化剂用量为癸二酸用量的2.5%,反应时间2 h,酯化产率可达97.80%。优化的合成方法具有反应时间短、产率高,对设备腐蚀性小等优点。 相似文献
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The kinetics of immobilized lipase-catalyzed esterification of oleic acid and methanol in hexane were investigated. The reaction
follows Michaelis-Menton kinetics as observed from the relationship of initial rate of the reaction, both as a function of
enzyme and of substrate concentration. Inhibition by excess of methanol has been identified. The kinetic constants have been
measured for the reaction in the absence of any significant external diffusional limitations. The kinetics of the enzymatic
reaction are suggested to agree with a Ping-Pong Bi Bi mechanism. 相似文献
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采用浸渍法制备了负载型ZrOCl2.8H2O/USY催化剂,并用XRD、SEM等对其进行了表征。以ZrOCl2.8H2O/USY为催化剂,考察了其对月桂酸与月桂醇酯化反应的催化性能。以月桂酸的转化率为考察指标,讨论了催化剂活性以及各种因素如催化剂用量、反应溶剂、反应时间对该酯化反应月桂酸的转化率的影响。实验结果表明,n(月桂酸)∶n(月桂醇)=1∶1,30%(质量分数)ZrOCl2.8H2O/USY为催化剂,反应溶剂为氯代苯,当催化剂用量为反应物总质量的5.0%,溶剂回流条件下反应16 h,月桂酸的转化率达95.2%。 相似文献
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用乙醇胺和己二酸二甲酯反应生成了中间体二羟乙基己二酰胺,当n(乙醇胺)∶n(己二酸二甲酯)=2时,收率95.2%。再将中间体与油酸进行酯化反应合成了具有润滑性能的二羟乙基己二酰胺油酸酯。合成的酯具有优良的热稳定性能、低挥发性、较低的毒性和良好的生物降解性,可成为环境友好型润滑剂。比较了酯化率和产品最终颜色,探讨了反应时间、反应温度对油酸酯化率的影响,优化了二羟乙基己二酰胺油酸酯合成条件:在吸水剂分子筛存在下,醇酸摩尔比为1∶2.2,反应时间为4 h,反应温度为125℃条件下,重复试验油酸的酯化率均在95%以上,产品的收率均在90%以上。 相似文献
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Izabelly L. Lucena João F.G. Oliveira Antônio E.B. Torres Expedito J.S. Parente Jr. Fabiano A.N. Fernandes 《Fuel》2011,90(2):902-904
The production of ethyl ester was investigated using a new reaction system consisting of a reactor coupled to an adsorption column. The adsorption system was used to shift the equilibrium toward ethyl ester production by removing the water from commercial ethanol and the water produced during the esterification reaction. A condenser placed above the adsorption column was responsible to condensate the vapor, returning water free ethanol to the reactor. Ethyl ester was produced by esterification of oleic acid and ethanol using sulfuric acid as catalyst. The results showed a yield of 99.9%. The best operating condition was found operating the reactor at 110 °C, 1% of catalyst (w/w) and with an oleic acid to ethanol ratio of 1:3. 相似文献
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Lie-Ding Shiau Tzong-Rong Ling Der-Shang Tseng 《Chemical Engineering Communications》2000,179(1):133-148
The esterification of 1,4-butanediol with acrylic acid catalyzed by sulfuric acid in the absence of solvent was studied in a batch stirred reactor. Experiments were carried out with different acid/ alcohol mole ratios and different amounts of sulfuric acid in the temperature range 70 to 90°C and 1 atm. It was found that the esterification of 1.4-butanediol with acrylic acid is a two-step consecutive, reversible reaction and each esterification step follows a first-order rate expression with respect to each component. A kinetic model was proposed to describe such a consecutive, reversible esterification reaction catalyzed by sulfuric acid. The equilibrium constants were determined from the equilibrium concentrations of each component while the rate constants in each reaction step were calculated by correlating the experimental data with the developed kinetic model. 相似文献
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在转鼓反应器中实现了油酸臭氧氧化裂解制备壬二酸的连续化操作。考察了转鼓转速、液体流量、气体流量对转鼓反应器内气液传质反应速率的影响。在双膜理论的基础上,利用恩田公式来计算气相传质系数、液相传质系数,建立了转鼓反应器中两步反应速率模型,并将模型预测值与实验值进行了比较。实验结果表明:在转鼓反应器中,油酸氧化裂解反应速率分别随转鼓转速和液体流量的增大,先增大后趋于平缓;随着气体通量的增加,转鼓反应器内油酸氧化裂解反应速率先增大然后减小;在转鼓转速为1 699 r/min、液体流量为45 mL/min、气体流量为3 L/min时,在转鼓内油酸氧化裂解可获得最大的气液传质反应速率。模型预测值与实验值比较,两者吻合得较好,验证了模型的可靠性。 相似文献
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The synthesis of oleyl oleate with immobilized 1,3-specific lipase from Mucor miehei is presented in this article. Oleyl alcohol was esterified with oleic acid in the presence of a Mucor miehei lipase (lipozymeIM) to obtain oleyl oleate. The effects of various temperatures and various enzyme/substrate ratios have been investigated to determine optimal conditions for the esterification process. The highest conversion of oleic acid 86.9 % was obtained at 50°C. The optimal addition of lipase to substrates was determined to be 0.1 g per gram of reaction mixture. The esterification can be modeled successfully as a reverse second-order reaction. Thermodynamic properties of the reaction system at 50°C were also determined. Activation energy was 14.65 kJ/mol, entropy of activation –0.8 J/mol·K and free energy of activation was 98.568 kJ/mol. 相似文献
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