Abstract: The solubilities of multi-component systems in biodiesel production from cottonseed oil were investigated. The inter-solubilities of five three-component systems，methanol + methyl ester + cottonseed oil，methanol + glycerol + cottonseed oil，methanol + methyl ester + glycerol，methanol + THF + cottonseed oil，glycerol + methyl ester + cottonseed oil were determined at 20 ℃，40 ℃ and 60 ℃ respectively. Methyl ester and tetrahydrofuran (THF) both made methanol dissolve in cottonseed oil easier. Glycerol，as a byproduct，hardly dissolves in the reaction system，leading to increase reaction conversion.

摘要： 研究了以棉籽油为原料制备生物柴油过程中，多组分体系之间的溶解度关系。分别测得在20℃、40℃、60℃下，甲醇＋甲酯＋棉籽油、甲醇＋四氢呋喃＋棉籽油、甲醇＋甘油＋棉籽油、甲醇＋甲酯＋甘油、棉籽油＋甲酯＋甘油5个三组分体系的相图。结果表明，生成的甲酯和加入的四氢呋喃都可促使甲醇和棉籽油互溶，使反应均相进行。副产物甘油在反应相中的溶解度小，有利于提高转化率。