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Hydrodynamic cavitation as an efficient approach for intensification of synthesis of methyl esters from sustainable feedstock

机译：水力空化是增强可持续原料合成甲酯的有效方法

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摘要

Investigations related to process intensification of synthesis of methyl esters from sustainable feedstock is gaining importance because of considerable energy requirements and higher reaction time in the conventional approach. The present work illustrates the use of hydrodynamic cavitation for intensification of methyl ester synthesis from the high acid value non-edible oil. Two-step synthesis of acid esterifica-tion followed by alkaline transesterification has been employed for obtaining the methyl esters. In first step, acid esterification is used to reduce the acid value of oil from 18.7 to less than 1.5 mg of oil/g of oil beyond which alkaline transesterification can be used without any problems of soap formation. The molar ratio and catalyst concentration have been optimized for the esterification and transesterification stages. The optimized molar ratios were 1:3 and 1:6 for esterification and transesterification respectively. Under optimized conditions, 92% conversion has been obtained in the transesterification stage. It has been established that due to the use of hydrodynamic cavitation, the energy requirement for the synthesis is significantly reduced as compared to the conventional approach. The novel route discussed in the present work provides a viable option and can be explored easily for the industrial scale of operations.
机译：由于传统方法中大量的能源需求和更长的反应时间，与从可持续原料合成甲酯的工艺强化相关的研究变得越来越重要。本工作说明了使用水力空化来增强高酸值非食用油合成甲酯的应用。酸酯化的两步合成，然后进行碱基酯交换反应，已被用于获得甲酯。在第一步中，使用酸酯化作用将油的酸值从18.7降低至小于1.5 mg油/ g油，在此范围内可以使用碱性酯交换反应而不会产生肥皂问题。摩尔比和催化剂浓度已针对酯化和酯交换步骤进行了优化。酯化和酯交换的最佳摩尔比分别为1：3和1：6。在优化条件下，酯交换阶段已获得92％的转化率。已经确定，由于使用了水动力空化，与常规方法相比，显着降低了合成所需的能量。当前工作中讨论的新颖路线提供了可行的选择，并且可以很容易地针对工业规模的运营进行探索。

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