Method for synthesizing trimethylolpropane fatty acid ester

Abstract

The invention relates to a method for synthesizing trimethylolpropane fatty acid ester, belonging to a technical field of synthesizing ester compounds in organic chemistry. Taking the trimethylolpropane and fatty acid are taken as the material, the invention is characterized in that: under the effect of solid catalyst and nitrogen atmosphere, dehydration-condensation reaction is caused and the obtained substances are filtered to prepare the trimethylolpropane fatty acid ester; the solid catalyst refers to stannous oxide or mixed oxide of Al2O3-SiO2, ferric chloride and so on and the adding amount of the solid catalyst is 0.02 to 0.11 percent of total weight percentage of the trimethylolpropane and the fatty acid; the weight ratio of the trimethylolpropane and the fatty acid is 1:2.85 to 3.05. In the invention, the novel solid catalyst is reasonably selected and the catalyst has high selectivity and by-products are hardly produced; the novel solid catalyst does not decay devices and the invention has the advantages of simple production processes, feasible recirculation and reutilization, stable product quality as well as favorable stability of hydrolysis, favorable biological degradation and low volatility.

Description

technical field [0001] The invention relates to a synthesis method of trimethylolpropane fatty acid ester, which belongs to the technical field of synthesis of ester compounds in organic chemistry. Background technique [0002] There are many types of trimethylolpropane fatty acid esters, and the application fields are relatively wide. Among them, trimethylolpropane palm kernel oleate and trimethylolpropane cocoate have excellent lubricating properties, good annealing detergency, good hydrolytic stability and low volatility, and are suitable for metal processing and rolling Oil, aviation engine lubricating oil, chemical fiber oil and other fields. [0003] Both palm kernel fatty acid and coconut fatty acid are mixed fatty acids. The fatty acid composition of palm kernel oil is as follows: caproic acid <1%, caprylic acid 2.4-6.2%, capric acid 2.6-7.0%, lauric acid 41-55%, myristic acid 14-20%, palmitic acid 6.5-11%, stearic acid Acid 1.3-3.5%, oleic acid 10-23%, linolei...

AI Technical Summary

Problems solved by technology

The use of this type of acidic catalyst requires water washing and other processes, the process is relatively complicated, and some catalysts still remain in the product, resulting in easy changes in the quality of the product during storage and affecting product stability.

The transesterification method uses trimethylolpropane and fatty acid methyl ester or ethyl ester as raw materials, and mainly uses basic catalysts. The process is complicated, the reaction speed is slow, and the esterification rate is not high. The introduction of basic catalysts makes post-processing complicated.