Method for synthesizing trimellitic triesters

A technology of trimellitic acid triester and trimellitic anhydride, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problems of limited, waste, trimellitic anhydride residues, etc., to increase economic benefits and reduce production Cost and environmental protection pressure, the effect of reducing the generation of pollutants

Active Publication Date: 2016-10-12
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to ensure that the content of phthalic anhydride in the trimellitic anhydride product is at an extremely low level in the existing product production method, a large amount of trimellitic anhydride is taken out into the light component during the light removal operation for removing phthalic anhydride; However, when extracting trimellitic anhydride, long-term extraction of trimellitic anhydride at high temperature will lead to carbonization of the material in the kettle, so the extraction time is limited, and there is still a large amount of trimellitic anhydride remaining in the heavy components; these trimellitic anhydrides cannot be rationally utilized, and the treatment of light and heavy components is currently a problem. Difficulties faced by various trimellitic anhydride manufacturers
Due to the existence of a large amount of trimellitic anhydride in the light component, it is extremely difficult to purify the phthalic anhydride in it, and it is difficult to effectively use it. Most of the heavy components are treated as solid waste incineration, causing a lot of waste and increasing the solid waste treatment. quantity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for producing trimellitic acid tris (2-ethylhexyl) ester with trimellitic anhydride light and heavy components, its concrete steps are as follows:

[0025] In the first step, 150g of trimellitic anhydride light component, 150g of heavy component, 300g of methanol and 0.9g of catalyst titanium dioxide are successively added to the reaction kettle, the temperature of the reaction kettle is raised to 65°C, the pressure is 12KG, the reaction solution boils, and the generated water and Methanol is produced, and fresh methanol is added at the same time, so that the amount of methanol added is consistent with the amount produced. The reaction time is 3 hours, and the conversion rate of trimethyl trimellitate is over 95%.

[0026] The second step, rectification: the methyl esterification reaction solution is poured into a closed rectification kettle. In a vacuum state, slowly heat the liquid in the tower, and carry out rectification under the conditions of 180-205°C, ...

Embodiment 2

[0033] In the first step, 150g of trimellitic anhydride light component, 150g of heavy component, 300g of methanol and 0.9g of catalyst tetraisopropyl titanate are successively added to the reaction kettle, the temperature of the reaction kettle is raised to 95°C, the pressure is 20KG, and the reaction solution is boiled. The generated water and methanol are extracted, and fresh methanol is added at the same time, so that the added amount of methanol is consistent with the output amount. The reaction time is 5 hours, and the conversion rate of trimethyl trimellitate is more than 95%.

[0034] The second step, rectification: the methyl esterification reaction solution is poured into a closed rectification kettle. In a vacuum state, slowly heat the tower still liquid, and carry out rectification under the conditions of 190-215°C, 500Pa in the tower still state, 200-205°C, 500Pa in the tower top state, and a reflux ratio of 1:2-2:1; Rectification obtains trimethyl trimellitate i...

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PUM

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Abstract

The invention discloses a method for synthesizing trimellitic triesters. The method comprises the following steps: carrying out a methyl esterification reaction on trimellitic anhydride light and heavy components and methanol used as raw materials under the catalysis of a catalyst to generate trimethyl trimellitate, rectifying the trimethyl trimellitate to obtain high-purity and low-color number trimethyl trimellitate, and carrying out ester exchange on trimethyl trimellitate and 2-ethylhexanol, and purifying the obtained ester exchange product to obtain a tri(2-ethylhexyl) trimellitate product. The method has the advantages of effective recycling of the trimellitic anhydride light and heavy components, reduction of generation of pollutants, increase of economic benefits, reduction of the product cost and the environmental protection pressure, low requirements of the content and the color number of the raw material trimellitic anhydride, and realization of high content and low color number of obtained trihexyl ester, and allows the quality of the trihexyl ester to be better than the quality of trihexyl ester obtained through direct esterification of trimellitic anhydride and 2-ethylhexanol.

Description

technical field [0001] The invention belongs to the field of plasticizer production, in particular to a method for producing trimellitate tris(2-ethylhexyl) by using light components and heavy components in the production process of trimellitic anhydride. Background technique [0002] Tris(2-ethylhexyl) trimellitate (TOTM) is a kind of trimellitate ester developed by the United States in the late 1960s. It is a plasticizer with excellent electrical and thermal properties. It has low volatility, good aging resistance, extraction resistance and heat resistance, and good insulation, so it can be used in the production of 105°C heat-resistant cable materials and 10kV PVC cable materials. In addition, it can also be used as an impregnating material for pulse and low-voltage power capacitors and a plasticizer for synthetic leather. In the United States, 78% of TOTM is used in the wire and cable industry, accounting for 13% of the total amount of wire and cable plasticizers, while...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/02C07C69/76C07C67/08C07C67/54
CPCC07C67/02C07C67/08C07C67/54C07C69/76
Inventor 郑铁江蒋国强马阳升曹圣平俞晔虎陶植
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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