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Kinetics of methyl esters production with dimethyl carbonate over niobium phosphate

机译：磷酸二铌与碳酸二甲酯生产甲酯的动力学

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摘要

The aim of this study is to evaluate commercial niobium phosphate as heterogeneous catalyst in biodiesel production from oleic acid and low-cost raw materials using dimethyl carbonate as acyl receptor. Catalyst was characterized and textural and structural properties were obtained. Effect of temperature, molar ratio and catalyst concentration were investigated. At higher temperature conditions, higher FFA conversions were achieved. Molar ratio was not a significant factor to conversion of oleic acid. The catalyst concentration had a positive effect on esterification reaction, increasing reaction rate and conversion of oleic acid. Most suitable condition was at 3 h, FFA:DMC molar ratio of 1:5, 5% catalyst based on FFA mass and 250 degrees C. Catalyst could be reutilized for up to 5 cycles without significant loss of activity. A pseudo-homogeneous first order reaction in forward and backward directions was proposed to esterification of oleic acid. Activity of niobium phosphate was investigated in simultaneous esterification and transesterification reactions.
机译：这项研究的目的是评估商用磷酸铌作为油酸和低成本原料使用碳酸二甲酯作为酰基受体在生物柴油生产中的非均相催化剂。表征了催化剂并获得了结构和结构性质。研究了温度，摩尔比和催化剂浓度的影响。在更高的温度条件下，实现了更高的FFA转化率。摩尔比不是影响油酸转化的重要因素。催化剂浓度对酯化反应，提高反应速率和油酸转化率有积极作用。最合适的条件是在3小时，FFA：DMC摩尔比为1：5，基于FFA质量的5％催化剂和250摄氏度的条件下。催化剂最多可重复使用5个循环，而活性没有明显损失。提出了正向和反向的拟均一阶反应对油酸进行酯化反应。在同时酯化和酯交换反应中研究了磷酸铌的活性。

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