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Continuous production process of high purity trimellitic anhydride with trimellitic acid

A technology of trimellitic acid and trimellitic anhydride, applied in the direction of organic chemistry, etc., can solve the problems of inability to produce high-purity products, increased energy consumption of refined materials, serious material decomposition, etc., so as to avoid decomposition and coking, reduce decomposition and coking, and treat short time effect

Active Publication Date: 2009-02-11
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Poor product quality, unstable quality, serious material decomposition
[0005] 2. During the intermittent production process, the reactor needs to repeatedly increase and decrease the pressure, increase the temperature and lower the temperature, the equipment is prone to fatigue and leakage, and the service life is shortened
The refinement of crude trimellitic anhydride in the above methods is single-tower intermittent or continuous rectification. Because the crude trimellitic anhydride contains complex impurities, only one simple rectification cannot produce high-purity products. To ensure product quality, more light and heavy components must be extracted. And carry out multiple distillations, resulting in an increase in refining material consumption and energy consumption

Method used

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  • Continuous production process of high purity trimellitic anhydride with trimellitic acid

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Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1 is the method for producing high-purity trimellitic anhydride through continuous anhydride formation of trimellitic acid of the present invention, specifically comprising the following process steps:

[0040] 1. Deacidification, dehydration, anhydride formation

[0041]Continuously drop 10000Kg of trimellitic acid granule wet material into 1# anhydride forming kettle 3, when the liquid level in 1# anhydride forming kettle reaches 60%, stop feeding, open the heating device to heat up, when the temperature in the kettle rises to ≥120 At ℃, start the stirring device of the anhydride forming kettle, continue to feed continuously into the anhydride forming kettle, control the temperature in the kettle at 120°C to 250°C, and the pressure at 0.05MPa to 0.15MPa, and the wet material of trimellitic acid particles is in the anhydride forming kettle It is melted into a liquid state, and the residual acetic acid and water brought in the granular wet material are remove...

Embodiment 2

[0049] 1. Deacidification, dehydration, anhydride formation

[0050] 15000Kg of trimellitic acid granule wet material is continuously dropped into 1# anhydride forming kettle 3, when the liquid level in the anhydride forming kettle reaches 60%, stop feeding, open the heating device and heat up, when the temperature in the still rises to ≥120°C, Start the stirring device of the anhydride forming kettle, continue to feed continuously into the anhydride forming kettle, control the temperature in the kettle at 160°C to 240°C, and the pressure at 0.05MPa to 0.15MPa, and the wet material of trimellitic acid particles is melted in the anhydride forming kettle Liquid state, and remove the residual acetic acid and water brought in the granular wet material. Trimellitic acid after dehydration enters 2# anhydride forming kettle 4, continues to remove a molecule of water in the molecule, steams and extracts acetic acid and water 2660Kg, and steam goes to the acetic acid concentration syst...

Embodiment 3

[0058] 1. Deacidification, dehydration, anhydride formation

[0059] Continuously put 20000Kg of trimellitic acid granule wet material into 1# anhydride forming kettle 3. When the liquid level in the kettle reaches 60%, stop feeding, turn on the heating device to raise the temperature, and when the temperature in the kettle rises to ≥120°C, start Anhydride forming tank stirring device, continue to feed continuously into the tank, control the temperature in the tank at 180 ° C ~ 230 ° C, the pressure is 0.05 MPa ~ 0.15 MPa, the wet material of trimellitic acid particles is melted into a liquid state in the 1# anhydride forming tank , and remove the residual acetic acid and water brought in the granular wet material. Trimellitic acid after dehydration enters 2# anhydride forming kettle 4, continues to remove a molecule of water in the molecule, steams and extracts acetic acid and water 3550Kg, and steam goes to the acetic acid concentration system after anhydride forming condens...

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Abstract

The continuous production process of high purity trimellitic anhydride with trimellitic acid includes the following steps: smelting trimellitic acid and eliminating acetic acid and water in the first kettle, and eliminating water inside trimellitic acid molecule in the second kettle to form trimellitic anhydride; eliminating heavy components in crude trimellitic anhydride product in one heavy component eliminating evaporator; eliminating light components in the evaporator of one light component eliminating tower; and rectifying through condensing trimellitic anhydride in the condenser on the top of the light component eliminating tower to obtain trimellitic anhydride product fed to the product tank. The present invention has stable product quality, high product purity, high product yield, low power consumption and other advantages.

Description

technical field [0001] The invention relates to a method for continuously refining trimellitic acid into anhydride to produce high-purity trimellitic anhydride. It belongs to the field of organic chemical technology. Background technique [0002] Trimellitic anhydride is an important organic chemical raw material for modern new materials. It has high reactivity and can produce a series of fine chemicals with high added value. It is mainly used in engineering plastics, high-quality plasticizers, heat-resistant insulating varnishes, advanced coatings, etc. industry. Because the resin material made of it has excellent electrical insulation, high temperature resistance and mechanical properties, it is also widely used in industrial fields such as electromechanical, electronic and aerospace. [0003] At present, the method for refining trimellitic anhydride mainly adopts the intermittent anhydride refining process, that is, the mixture of trimellitic acid and solvent generated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/89
Inventor 郑铁江高峰
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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