| The synthesis process of vegetable oil methyl ester was improved so as to increase the conversion rate and yield of vegetable oil methyl ester. The synergistic effect of shearer introduced to the transesterification was investigated, and the shortest reaction time was determined. The feasibility of sulfuric acid-catalyzed esterification of fatty acid saponifiable matter to improve the separation efficiency and yield was also researched. The results showed that the transesterification efficiency of the improved process increased greatly. The contents of monoglycerides, diglycerides and triglycerides were less than 0.5%, 1% and undetectable respectively only in 5 min with laboratory device, and the conversion rate reached 99.1%. The fatty acid saponifiable matter, the by-product in the reaction was neutralized by sulfuric acid and then esterified with methanol, the shortest reaction time was 1 h, and the acid value of the product was below 0.8 mgKOH/g. Since emulsification effect caused by the fatty acid saponifiable matter was eliminated, the quick separation of oil and water was realized, and all the by-products transformed to fatty acid methyl ester, so the yield of the product reached 99.5%. All the raw materials were industrial grade with low cost and wide selection of raw oils. |
