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An innovative auto-catalytic esterification for the production of phytosterol esters: experiment and kinetics

机译：用于生产植物甾醇酯的创新型自动催化酯化反应：实验和动力学

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摘要

An innovative auto-catalytic method was proposed to synthesize phytosterol esters from phytosterols and long-chain fatty acids without adding any catalyst and solvent. The effects of reaction temperature, molar ratio of oleic acid/phytosterols, reaction time and carbon-chain length of the fatty acids on the reaction were investigated. The results showed that the conversion, the yield and the selectivity of the reaction were increased with the increase in reaction temperature, molar ratio and a decrease in the length of carbon chains of fatty acids. The selectivity was decreased on prolonging the reaction time. A high conversion (99.1%) with a high yield (94.9%) and selectivity (95.8%) was achieved under a molar ratio of oleic acid/phytosterols of 3 : 1, a reaction temperature of 220 degrees C and reaction time of 4 h. The properties of the phytosterol oleic esters by autocatalysis conformed to the quality indices of phytosterol esters from the China Ministry of Health and were superior to the commercial product. The kinetics suggested that the reaction order was 2 and the reaction activation energy was 58.75 kJ mol(-1). The auto-catalytic process, omitting the separation step for catalysts and solvents, could be considered as a promising process to synthesize phytosterol esters.
机译：提出了一种新颖的自动催化方法，无需添加任何催化剂和溶剂即可从植物甾醇和长链脂肪酸合成植物甾醇酯。研究了反应温度，油酸/植物甾醇的摩尔比，反应时间和脂肪酸的碳链长度对反应的影响。结果表明，随着反应温度，摩尔比的增加和脂肪酸碳链长度的减少，反应的转化率，收率和选择性增加。随着反应时间的延长，选择性降低。在油酸/植物甾醇的摩尔比为1：1，反应温度为220摄氏度，反应时间为4小时的条件下，可实现高转化率（99.1％），高产率（94.9％）和选择性（95.8％） 。通过自动催化的植物甾醇油酸酯的性能符合中国卫生部的植物甾醇酯的质量指标，并且优于商业产品。动力学表明反应阶数为2，反应活化能为58.75 kJ mol（-1）。自动催化过程，省去了催化剂和溶剂的分离步骤，可以被认为是合成植物甾醇酯的有前途的过程。

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