Method for preparing m-phthaloyl chloride in high purity

A high-purity isophthaloyl chloride technology, which is applied in the field of preparation of high-purity isophthaloyl chloride by chlorination, can solve the problems of high production cost, long production cycle, and complicated process of isophthaloyl chloride. To achieve the effect of highlighting substantive features, low production cost, and simple refining process

Active Publication Date: 2005-01-12
WANHUA CHEM GRP CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention aims to overcome the above-mentioned deficiencies in the prior art, and provide a kind of preparation method of chlorinating agent method to produce high-purity isophthaloyl chloride, mainly solve existing isophthaloyl chloride production cost height, production Problems of long period, low yield and complex process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, first 480 kilograms of chlorobenzene, 100 kilograms of isophthalic acid and 10 kilograms of N, N-dimethylformamide are added in the batching tank, close chlorobenzene, isophthalic acid and N, N-dimethylformamide Base formamide feed valve, start stirring to mix the raw material liquid, use the slurry pump to transport the mixed slurry raw material into the reactor, close the slurry pump and feed valve; open the stirring device of the reactor, and feed the liquid Heat to 75°C, open the exhaust condenser cooled with chilled water on the upper part of the reactor, open the tail gas exhaust valve, and then open the chlorinating agent COCl 2 Feed valve to regulate gaseous COCl 2 The flow rate is 100L / h, the temperature of the feed liquid gradually rises to 85°C, and is maintained until the end of the reaction. During the reaction, the slurry in the reaction liquid becomes less and less, the color of the solution gradually turns yellow, and there is basically no ...

Embodiment 2

[0015] Embodiment 2, earlier 480 kilograms of isophthaloyl dichloride, 100 kilograms of isophthalic acid and 10 kilograms of N, N-diethylformamide join in the batching tank, close isophthaloyl dichloride, isophthalic acid and N, N-dimethylformamide feed valve, start stirring to mix the raw material liquid, use the slurry pump to transport the mixed slurry raw material into the reactor, close the slurry pump and the feed valve; open the reactor Stirring device, heat the feed liquid to 50°C, open the exhaust condenser cooled with chilled water on the upper part of the reactor, open the tail gas exhaust valve, and then open the SOCl 2 Feed valve, regulate SOCl 2 The flow rate is 100L / h, the temperature of the feed liquid rises gradually to 90°C, and remains until the end of the reaction. During the reaction, the slurry in the reaction liquid becomes less and less, the color of the solution gradually turns yellow, and there is basically no solid in the reaction liquid For particl...

Embodiment 3

[0016] Embodiment 3, first 240 kilograms of dichlorobenzene, 240 kilograms of xylene, 100 kilograms of isophthalic acid and 10 kilograms of N, N-diethylformamide are added in the batching tank, close the dichlorobenzene, xylene, m- Phthalic acid and N, N-dimethylformamide feed valves, start stirring to mix the raw material liquid, use the slurry pump to transport the mixed slurry raw materials into the reactor, and close the slurry pump and feed valve; Turn on the stirring device of the reactor, heat the feed liquid to 30°C, open the exhaust condenser cooled with chilled water on the upper part of the reactor, open the tail gas exhaust valve, and then open the POCl 3 Feed valve, regulating POCl 3 The flow rate is 100L / h, the temperature of the feed liquid is gradually raised to 50°C, and kept until the end of the reaction. During the reaction, the slurry in the reaction liquid becomes less and less, the color of the solution gradually turns yellow, and there is basically no so...

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Abstract

This invention relates to prepn. of high pureness m-benzene diformyl chloride, by using m-benzene dicarbonic acid as raw material, reacting with chlorination agent under function of catalyst, then proceeding chemical reaction, separation, refined to produce high pureness m-benzene diformyl chloride with pureness up to 99.8%.

Description

(1) Technical field: [0001] The invention relates to the technical field of production of isophthaloyl dichloride, in particular to a preparation method for producing high-purity isophthaloyl dichloride by a chlorination method. (two) background technology: [0002] With the rapid development of aramid fiber, a special synthetic fiber with superior performance, especially aramid 1313, the demand for isophthaloyl chloride, one of the two main raw materials necessary for the synthesis of aramid 1313, is also growing rapidly. In addition, isophthaloyl chloride can also be used as a monomer of polyamide, polyester, polyarylate, polyarylamide, liquid crystal polymer, etc., and can also be used as a modifier for high polymers, and an intermediate in the pesticide and pharmaceutical industries. At present, the production method of isophthaloyl chloride is mainly PCl3 method. This method is to suspend isophthalic acid in PCl3, heat PCl3 to boiling, under the state of reflux, stir ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/60C07C63/00C07C63/68
Inventor 徐海全杨万宏杜永顺盛丽萍马德强
Owner WANHUA CHEM GRP CO LTD
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