响应面法优化PSSA/PVA共混膜催化酯化制备生物柴油

Process optimization of biodiesel production by PSSA/PVA membrane catalyst using response surface method

采用响应面法考察聚苯乙烯磺酸(PSSA)/聚乙烯醇(PVA)共混型催化膜催化酯化制备生物柴油工艺中催化膜用量、醇油质量比、反应时间和反应温度及其交互作用对酯化率的影响,结果发现,各因素对转化率影响顺序为:醇油比>催化剂用量>反应温度>反应时间;同时,醇油比与催化剂量的交互作用对转化率的影响最强,而与反应时间相关的交互作用则弱.最佳条件为:催化剂用量1.56mol(H+)、醇油质量比1.2∶1、反应时间7h和反应温度64.5℃.预测的酯化转化率(97.27%)与实验验证结果(94.60%)比较接近.

A poly（styrene sulfonic acid） （PSSA）/poly（vinyl alcohol） （PVA） blend membrane was used as a catalyst for producing biodiesel from acidic oil. The effects of methanol-oil ratio, reaction time, catalyst amount and temperature on the esterification conversion of fatty acids were investigated through response surface method（RSM）. The results showed that the order of their effects on the conversion was methanol- oil ratio〉catalyst amount〉temperature〉reaction time. The interaction effect between methanol-oil ratio and catalyst amount on the conversion was most significant; nevertheless the interaction effects related with reaction time was less significant. A quadratic polynomial equation was obtained for esterification conversion by multiple regression analysis. The optimum conditions for the esterification obtained were methanol-oil mass ratio of 1.2 ~ 1, the amount of catalyst of 1.56 mol （H＋）, temperature of 64. 5 ℃ and reaction time of 7 h. The experimental conversion was 94. 60%, close to the predicted conversion （97.27%） by the equation.