双液相萃取棉籽油制备脂肪酸甲酯

以双液相萃取技术处理棉籽，在得到脱毒棉粕的同时得到含有高质量毛油的非极性相。以非极性相作为与甲醇进行酯交换反应的原料，得到脂肪酸甲酯和甘油。考察了非极性相溶剂石油醚与棉籽油的比例对酯交换转化率和洗涤粗产品用水量的影响，确定了石油醚与棉籽油的最佳质量比为3，在此条件下，洗涤用水量可降低一半。考察了醇油比、催化剂用量、反应温度、反应时间等参数对转化率的影响。应用正交实验的方法找出酯交换反应的适宜条件为：醇油比6：1，催化剂用量1.1％，反应温度60℃，反应时间120min。在此反应条件下，产物中脂肪酸甲酯的含量可达97.4％。

Preparation of fatty acid methyl ester from cottonseed oil produced by two-phase solvent extraction

Cottonseed as raw material was processed by two phase solvent extractionNon-toxic crude protein was produced, and at the same time the nonpolar solution containing high quality crude cottonseed oil was used for transesterification reaction with methanol to produce fatty acid ester and glycerolThe effect of mass ratio of petroleum ether to crude cottonseed oil on the fatty acid ester content and the quantity of water needed for washing the product were investigatedIt was confirmed that the best mass ratio of petroleum ether to crude cottonseed oil was 3Under this condition, the water consumption was halvedThe effect of methanol/oil molar ratio, catalyst amount, reaction temperature and time were also studiedThrough orthogonal analysis, the optimum conditions were obtained as follows: the molar ratio of methanol to oil 6:1, the amount of catalyst 1.1%, reaction temperature 60℃ and reaction time 120 minThe results of parallel tests showed that under such optimum condition the cottonseed oil conversion could reach 97.7%.