改性蒙脱土催化环氧油酸甲酯制备支链脂肪酸甲酯

Preparation of branched fatty acid methyl esters from epoxidized oleic acid methyl ester catalyzed by modified montmorillonite

以硫酸改性的蒙脱土为催化剂,催化环氧油酸甲酯制备支链脂肪酸甲酯。以开环转化率为指标,通过单因素实验考察反应时间、反应温度、n(异辛醇)∶n(环氧键)、催化剂加入量对改性蒙脱土催化制备支链脂肪酸甲酯的影响,并采用响应面法进行优化,然后对产物进行了红外光谱分析。得到制备支链脂肪酸甲酯的最佳反应条件为反应时间12 h、反应温度90℃、n(异辛醇)∶n(环氧键)=3.4∶1、催化剂加入量(占环氧油酸甲酯质量)3.7%,在此条件下开环转化率达到99.57%。

The branched fatty acid methyl esters were prepared using the modified montmorillonite as ring - opening catalyst and epoxidized oleic acid methyl ester as raw material. With open - loop conver- sion rate as index, the effects of catalyst dosage, reaction time, reaction temperature, and molar ratio of isooctanol to epoxy bond on the preparation of branched fatty acid methyl esters catalyzed by modified montmorillonite were investigated by single factor experiment. Then every factor was optimized by response surface methodology, and the product was characterized by FT - IR. The results showed that the optimal preparation conditions of branched fatty acid methyl esters were obtained as follows ： reaction time 12 h, reaction temperature 90℃, catalyst dosage 3.7% （based on the mass of epoxidized oleic acid methyl ester）, molar ratio of isooctanol to epoxy bond 3.4： 1. Under these conditions, the open -loop conversion rate reached 99.57%.