A kind of decolorization process in the production process of synthetic ester

Abstract

The invention relates to a decolorization process in the production process of synthetic esters. The steps are as follows: 1) After the esterification reaction is finished, put the reaction product into a container, add an alkali-eluting decolorant, stir for 10-30min, leave it to stand for stratification, and divide it into the lower water phase and the upper oil phase , take the upper layer of grease; 2) put the upper layer of grease in step 1) into the container, add an organic decolorizer, after stirring for 10-30min, add deionized water with a total volume of the solution in the container of 10%-100%, and continue stirring for 10 ‑30min, stand for stratification, be divided into the water phase of the lower layer and the oil phase of the upper layer, and get the upper layer of grease; 3) add a solid decolorizer to the upper layer of grease described in step 2), heat and stir for 1h, filter, and get the filtrate; 4 ) The filtrate is vacuum distilled to obtain a colorless and transparent heavy component liquid, which is a synthetic ester. The decolorization process in the synthetic ester production process of the present invention is simple and efficient, and is suitable for large-scale production; the decolorized and refined synthetic ester product through the process of the present invention is a colorless transparent liquid.

Description

technical field [0001] The invention relates to a decolorization process in the production process of synthetic esters. Background technique [0002] As a chemical raw material with excellent performance, synthetic ester is widely used in many fields such as lubricating oil, paint, plasticizer, cosmetics, etc. It is an expensive and high-end chemical product. [0003] However, the higher the application field, the higher the quality requirements for chemical products. An important item in the quality index of synthetic ester is chroma. As we all know, most mature synthetic ester production processes use benzenesulfonic acid, concentrated sulfuric acid, solid acid, etc. as catalysts. The acidic catalyst will cause the product to slowly color under heating conditions. Especially when benzenesulfonic acid and concentrated sulfuric acid are used as catalysts, the color of the synthesized ester products is mostly dark yellow, and even dark brown if the color is serious, and th...

AI Technical Summary

Problems solved by technology

The acidic catalyst will cause the product to slowly color under heating conditions

Especially when benzenesulfonic acid and concentrated sulfuric acid are used as catalysts, the color of the synthesized ester products is mostly dark yellow, and the serious coloring is even dark brown, and the color is extremely difficult to remove

[0004] At the same time, due to the complex sources of synthetic ester raw materials, some are chemically synthesized, some are biologically produced, and some are naturally extracted. There are many impurities in the raw materials, and it is difficult to identify them one by one.

It is also difficult to effectively remove the coloring impurities generated during the production process by a single method