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Method for producing isophthalic acid through oxidation of m-xylene

A technology of isophthalic acid and m-xylene, applied in chemical instruments and methods, preparation of organic compounds, catalytic reactions, etc., can solve the problems of expensive, limited application range, and color of PTA

Pending Publication Date: 2022-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] No matter which process is used, bromine is needed as a cocatalyst, and bromine is very corrosive, especially under high temperature conditions, so all reactors use expensive titanium materials; at the same time, due to the small amount of macromolecular organic matter and un Remove clean metal impurities and make the product colored, which limits the application range of PTA

Method used

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  • Method for producing isophthalic acid through oxidation of m-xylene
  • Method for producing isophthalic acid through oxidation of m-xylene

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The reaction was carried out in a 1000ml titanium autoclave equipped with a magnetic stirrer, a gas delivery pipe, a reflux condenser, a thermocouple, and a bursting disc, with a stirring speed of 400rpm and heated by circulating hot oil. The reaction steps are as follows:

[0048] 1) m-xylene, acetic acid, cobalt acetate tetrahydrate, manganese acetate tetrahydrate, benzoic acid and tetrabromoethane are mixed uniformly to obtain a liquid raw material mixture, which contains 100g of m-xylene, 800g of acetic acid, 250ppmw The cobalt of 500ppmw, the manganese of 500ppmw, the benzoic acid of 500ppmw and the bromine of 300ppmw, add the liquid raw material mixture into the autoclave, airtight.

[0049] 2) Add 3.0MPa nitrogen to carry out the airtight test for 30 minutes, and the pressure drop within 30 minutes is not more than 0.1MPa, which is qualified.

[0050] 3) Add nitrogen, the space velocity is 4h -1 (The space velocity is the ratio of the volume of nitrogen gas to ...

Embodiment 2

[0055] The reaction was carried out in a 1000ml titanium autoclave equipped with a magnetic stirrer, a gas delivery pipe, a reflux condenser, a thermocouple, and a bursting disc, with a stirring speed of 400rpm and heated by circulating hot oil. The reaction steps are as follows:

[0056] 1) m-xylene, acetic acid, cobalt acetate tetrahydrate, manganese acetate tetrahydrate, benzoic acid and tetrabromoethane are mixed uniformly to obtain a liquid raw material mixture, which contains 100g of m-xylene, 800g of acetic acid, 250ppmw The cobalt of 500ppmw, the manganese of 500ppmw, the benzoic acid of 300ppmw and the bromine of 300ppmw, add the liquid raw material mixture into the autoclave, airtight.

[0057] 2) Add 3.0MPa nitrogen to carry out the airtight test for 30 minutes, and the pressure drop within 30 minutes is not more than 0.1MPa, which is qualified.

[0058] 3) Add nitrogen, the space velocity is 4h -1 (The space velocity is the ratio of the volume of nitrogen gas to ...

Embodiment 3

[0063] The reaction was carried out in a 1000ml titanium autoclave equipped with a magnetic stirrer, a gas delivery pipe, a reflux condenser, a thermocouple, and a bursting disc, with a stirring speed of 400rpm and heated by circulating hot oil. The reaction steps are as follows:

[0064] 1) m-xylene, acetic acid, cobalt acetate tetrahydrate, manganese acetate tetrahydrate, benzoic acid and tetrabromoethane are mixed uniformly to obtain a liquid raw material mixture, which contains 100g of m-xylene, 800g of acetic acid, 250ppmw The cobalt of 500ppmw, the manganese of 500ppmw, the benzoic acid of 800ppmw and the bromine of 300ppmw, add the liquid raw material mixture into the autoclave, airtight.

[0065] 2) Add 3.0MPa nitrogen to carry out the airtight test for 30 minutes, and the pressure drop within 30 minutes is not more than 0.1MPa, which is qualified.

[0066] 3) Add nitrogen, the space velocity is 4h -1 (The space velocity is the ratio of the volume of nitrogen gas to ...

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Abstract

The invention relates to a method for producing isophthalic acid through oxidation of m-xylene, and mainly solves the problem of low transmittance of an isophthalic acid product in synthesis of isophthalic acid through oxidation of m-xylene in the prior art. According to the technical scheme, the method for producing isophthalic acid through oxidation of m-xylene comprises the steps that benzoic acid is added, in the presence of a catalyst, acetic acid serves as a solvent, an oxidizing agent and m-xylene are subjected to a liquid-phase oxidation reaction to synthesize isophthalic acid, and the catalyst comprises 200-300 parts by weight of Co salt, 10-30 parts by weight of Mn salt and 10-30 parts by weight of bromine-containing compound; the Mn salt accounts for 400-600 parts by weight in terms of Mn; by adopting the technical scheme, the technical problem is well solved, and the catalyst can be used for the production of synthesizing the isophthalic acid by oxidizing the m-xylene.

Description

technical field [0001] The invention relates to a method for producing isophthalic acid by oxidation of m-xylene. Background technique [0002] Purified isophthalic acid (English name Isophtalic Acid, hereinafter referred to as PIA or IPA); refined isophthalic acid is used to synthesize special fibers with better fatigue strength than fibers and to produce unsaturated polyesters, alkyd resins, printing ink resins, Insulating varnish, polyester modified dyeing agent, coating and other products. At present, the main production plants in the world include Amoco Company of the United States, Amoco Belgium Chemical Company, A.G. Chemical Company of Japan, and SISAS Company of Italy, etc., with a total production capacity of nearly 300,000 tons per year. It is currently the most important destination of foreign m-xylene consumption. [0003] The production of isophthalic acid generally adopts m-xylene (MX) liquid phase oxidation, using cobalt acetate and manganese acetate as cata...

Claims

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Application Information

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IPC IPC(8): C07C63/24C07C51/265B01J27/128B01J31/04B01J31/32
CPCC07C51/265B01J27/128B01J31/04B01J31/32B01J2231/70C07C63/24
Inventor 肖忠斌朱小丽
Owner CHINA PETROLEUM & CHEM CORP
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