Decolorization process in synthetic ester production procedures

Abstract

The invention relates to a decolorization process in synthetic ester production procedures. The decolorization process includes steps of 1), arranging reaction products in a container after esterification reaction is completed, adding alkali cleaning decolorizing agents into the container, stirring the reaction products and the alkali cleaning decolorizing agents for 10-30 min to obtain mixtures, allowing the mixtures to stand still, layering the mixtures to obtain lower-layer water phases and upper-layer oil phases and acquiring upper-layer grease; 2), arranging the upper-layer grease obtained at the step 1) in a container, adding organic decolorizing agents into the container, stirring the upper-layer grease and the organic decolorizing agents for 10-30 min to obtain solution, then adding deionized water into the container, stirring the deionized water and the solution for 10-30 min to obtain mixed solution, allowing the mixed solution to stand still, layering the mixed solution to obtain lower-layer water phases and upper-layer oil phases and acquiring upper-layer grease; 3), adding solid decolorizing agents into the upper-layer grease obtained at the step 2), heating and stirring the solid decolorizing agents and the upper-layer grease for 1 h to obtain liquid and filtering the liquid to obtain filter liquid; 4), distilling the filter liquid under vacuum conditions to obtain colorless and transparent heavy-component liquid which is synthetic ester. The volume of the deionized water is 10%-100% of the total volume of the solution in the container. The decolorization process in the synthetic ester production procedures has the advantages that the decolorization process is simple and is high in efficiency and suitable for large-scale production; synthetic ester products decolorized and refined by the aid of the decolorization process is the colorless and 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