Method for producing trioctyl trimellitate with trimellitic acid

A technology of trioctyl trimellitate and trimethyl trimellitate, which is applied in the production field of trioctyl trimellitate, can solve the problem of large octanol molecule, difficult to triesterification, and difficult to target products Separation and other problems, to achieve the effect of reducing octanol monoester and diesterization impurities, reducing difficulty, and low equipment requirements

Active Publication Date: 2009-05-13
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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  • Summary
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AI Technical Summary

Problems solved by technology

High-temperature, high-vacuum rectification has relatively high requirements for technology and equipment, and because octanol has a large molecule, it is difficult to completely realize triesterization in the direct esterification method, so there is always a small amount of mono-esterification and di-esterification Impurities are mixed in the finished product of trioctyl trimellitate, which is difficult to economically and conveniently separate from the target product, see Chinese patent ZL 200510095365.8

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] A certain batch of trimellitic acid pretreated by cooling, crystallization, filtration and washing was sampled and separated and detected by liquid chromatography. The content of trimellitic acid was 91.3%.

[0023] Get above-mentioned trimellitic acid 1000kg, put into volume and be 10M 3 In the methyl esterification reaction kettle, add 2500kg of xylene as a water-carrying agent, then add 5kg of concentrated sulfuric acid as a catalyst, stir, and heat to make the temperature of the kettle rise to 100°C. Weigh 800kg of methanol, add it to the dropping funnel on the top of the kettle, and add methanol to the reaction kettle at a rate of 1.9L / min, that is, 1.5kg / min.

[0024] The temperature of the reaction kettle was raised to 125°C, and the distilled distillate was collected in a transparent water separator on the top of the kettle. After the water layer is separated out in the water separator, the water layer is separated in time. After all the methanol has been adde...

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PUM

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Abstract

The invention relates to a method for producing trioctyl trimellitate through using trimellitic acid. Intermediate products of trimellitic acid and methanol in the process of producing the trimellitic anhydride are esterified to generate trimethyl trimellitate; the trimethyl trimellitate and 2-ethylhexanol (commonly called asoctanol) are subjected to ester exchange to produce trimellitate (2-ethyl) trihexyl ester (trioctyl trimellitate). The method of methyl esterification and ester exchange can reduce requirement on a technology and equipment so that the intermediate product of the trimellitic acid in the process of producing the trimellitic anhydride is flexibly utilized.

Description

(1) Technical field [0001] The invention relates to a production method of trioctyl trimellitate. It belongs to the technical field of organic chemical products. (2) Background technology [0002] Trioctyl trimellitate is a kind of plasticizer with good heat resistance, which can obviously improve the temperature resistance grade of PVC plastic, rubber, resin, etc., and can be used as 105℃ and 125℃ grade cable material. It is also used in automobile decoration materials, swimming pool waterproof layer, capacitor impregnated oil, etc. [0003] At present, the method for industrially producing trioctyl trimellitate is generally to carry out direct esterification with trimellitic anhydride and octanol. Industrially, trimellitic acid is obtained from trimellitic acid in the liquid state by air oxidation, dehydrated into anhydride at high temperature, and then rectified at high temperature and high vacuum to obtain trimellitic anhydride with a content of more than 95%. High-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/76C07C67/08
Inventor 郑铁江陶植薛建军
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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