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Preparation method and application of trimellitic acid or trimesic acid

A technology of trimellitic acid and trimellitic acid, which is applied in the preparation of carboxylate salts, organic compounds, chemical instruments and methods, etc. It can solve the problems of low total yield, large equipment investment, and unoptimized reaction conditions, etc. problems, to achieve the effect of improving the yield

Pending Publication Date: 2021-04-23
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, different oxidation reaction conditions will have a greater impact on the product quality and yield of TMA
[0004] Chinese patent CN1131223C discloses a method for the production of trimellitic anhydride by a continuous oxidation process. Compared with the batch method, this method has made great progress, and the total yield is 120%, but its reaction process is carried out in an oxidation reactor, and It is difficult to optimize the reaction conditions in single reactor continuous production
Chinese patent CN1594302A discloses a method for continuous production of trimellitic anhydride by catalytic oxidation step by step. This method solves the self-inhibition effect of the trimellitic oxidation catalyst, but the oxidation condition of the third methyl group in the trimellitic oxidation process is more severe. , so the method has not reached the optimal reaction conditions
Chinese patent CN1634907A discloses a method for the production of trimellitic anhydride by continuous oxidation of stirred tanks into anhydrides. The optimization of the reaction conditions in different reaction stages is realized by using multi-pot reaction, and the total yield is 115-128%. , the equipment investment is large, and the reliability of the operation process is reduced
However, this method has low overall yield due to the unoptimized reaction conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 1,000 g of mesitylene, 5,600 g of acetic acid, 5 g of cobalt acetate, 1 g of manganese acetate, and 10 g of tetrabromoethane into batching tank 1, stir evenly, and keep the temperature in batching tank 1 at 80° C. Add 4 g of manganese acetate and 400 g of acetic acid into the batching tank 2, stir evenly, and keep the temperature in the batching tank 2 at 80° C. Pump half of the material in the batching tank 1 to the reactor 1, and then seal the reactor 1 with nitrogen gas, heat the material in the reactor 1 to 170°C, and then feed compressed air at a flow rate of 4L / h , initiate the reaction, when the reaction temperature presents an upward trend, and when the tail gas content in the reactor 1 starts to rise simultaneously, continue to continuously add the materials in the batching tank 1 to the reactor, control the oxygen content of the reactor 1 tail gas below 6%, and keep The temperature of the reactor is 200°C, and the pressure is 2.0MPa, gradually making the s...

Embodiment 2

[0027]Add 1,000 g of trimethylene, 2,900 g of acetic acid, 1 g of cobalt acetate, 1 g of manganese acetate, and 3 g of tetrabromoethane into batching tank 1, stir evenly, and keep the temperature in batching tank 1 at 80° C. Add 1 g of manganese acetate and 100 g of acetic acid into the batching tank 2, stir evenly, and keep the temperature in the batching tank 2 at 80° C. Pump half of the material in the batching tank 1 to the reactor 1, and then seal the reactor 1 with nitrogen gas, heat the material in the reactor 1 to 150°C, and then feed compressed air at a flow rate of 2L / h , initiate the reaction, when the reaction temperature presents an upward trend, and when the tail gas content in the reactor 1 starts to rise simultaneously, continue to continuously add the materials in the batching tank 1 to the reactor, control the oxygen content of the reactor 1 tail gas below 6%, and keep The temperature of the reactor is 170°C and the pressure is 1.5MPa, gradually making the sy...

Embodiment 3

[0029] Add 1,000 g of trimethylene, 3,800 g of acetic acid, 3 g of cobalt acetate, and 3 g of tetrabromoethane into batching tank 1, stir evenly, and keep the temperature in batching tank 1 at 80° C. Add 1.5 g of manganese acetate and 200 g of acetic acid into the batching tank 2, stir evenly, and keep the temperature in the batching tank 2 at 80° C. Pump half of the material in the batching tank 1 to the reactor 1, and then seal the reactor 1 with nitrogen gas, heat the material in the reactor 1 to 170°C, and then feed compressed air at a flow rate of 3L / h , initiate the reaction, when the reaction temperature presents an upward trend, and when the tail gas content in the reactor 1 starts to rise simultaneously, continue to continuously add the materials in the batching tank 1 to the reactor, control the oxygen content of the reactor 1 tail gas below 6%, and keep The temperature of the reactor is 200°C, and the pressure is 2.0MPa, gradually making the system reach a steady st...

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PUM

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Abstract

The invention belongs to the technical field of organic synthesis processes, and particularly relates to a preparation method and application of trimellitic acid or trimesic acid. According to the characteristics of the oxidation reaction process of 1,2,4-trimethylbenzene or mesitylene, two stages of reactors are connected in series, different oxidation reaction process conditions are respectively adopted, particularly, a second-stage reactor adopts a reaction strengthening technology, and an oxygen-enriched oxidation mode is adopted to strengthen the oxidation reaction process and increase the yield of the trimellitic acid or the trimesic acid.

Description

technical field [0001] The invention relates to the technical field of organic synthesis technology, in particular to a preparation method and application of trimellitic acid or trimellitic acid. Background technique [0002] Trimellitic anhydride, also known as 1,2,4-trimellitic anhydride, is usually abbreviated as partial anhydride (TMA). TMA is an important chemical raw material in the organic synthesis industry. It has a wide range of uses. At present, the most important use is as a plasticizer for the production of PVC resin. , that is, TMA reacts with isooctyl alcohol to form trioctyl trimellitate (TOTM). As a non-toxic and environmentally friendly plasticizer, TOTM has the characteristics of high temperature resistance, aging resistance, corrosion resistance, migration resistance, and excellent insulation properties. , has been fully affirmed and developed in the plasticizer industry. Trimellitic acid or 1,3,5-benzenetricarboxylic acid is an important chemical raw ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/265C07C63/307C07D307/89B01J19/18
CPCC07C51/265C07D307/89B01J19/1862C07C63/307
Inventor 汪洋杨爱武邢跃军王保正胡维强王玉春
Owner SINOPEC YANGZI PETROCHEM