Method used for preparing isophthaloyl dichloride and paraphthaloyl chloride

A technology of terephthaloyl chloride and terephthalic acid, which is applied in the field of preparation of iso/terephthaloyl chloride, can solve the problems not mentioned in the production of iso/terephthaloyl chloride, and achieve the effect of increasing the reaction rate

Inactive Publication Date: 2016-03-02
SHANDONG KAISHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] None of the currently published patents and documents mentions the production of iso / terephthaloyl chloride by bubbling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Put m / terephthalic acid, catalyst and thionyl chloride into the reaction kettle for reaction, put dry nitrogen into the reaction kettle by bubbling, and gradually increase the input amount of dry nitrogen as the reaction proceeds ;The reaction temperature is 70°C, the reaction pressure is -0.02Mpa, and the nitrogen gas flow rate is 50-500L / h;

[0018] (2) After the reaction, continue to feed nitrogen gas, the amount of nitrogen gas feeding is 5-200L / h, the solvent is removed from the material, the temperature is 90°C during the solvent removal, the vacuum degree is not lower than 650mmHg, and the product is refined.

Embodiment 2

[0020] (1) Put m / terephthalic acid, catalyst and thionyl chloride into the reaction kettle for reaction, put dry nitrogen into the reaction kettle by bubbling, and gradually increase the input amount of dry nitrogen as the reaction proceeds ;The reaction temperature is 100°C, the reaction pressure is 0.02Mpa, and the nitrogen gas flow rate is 50-500L / h;

[0021] (2) After the reaction, continue to feed nitrogen gas, the amount of nitrogen gas feeding is 5-200L / h, remove the solvent from the material, the temperature is 130°C during the solvent removal, the vacuum degree is not lower than 650mmHg, and the product is refined.

Embodiment 3

[0023] (1) Put m / terephthalic acid, catalyst and thionyl chloride into the reaction kettle for reaction, put dry nitrogen into the reaction kettle by bubbling, and gradually increase the input amount of dry nitrogen as the reaction proceeds ;The reaction temperature is 80°C, the reaction pressure is 0.01Mpa, and the nitrogen feed rate is 50-500L / h;

[0024] (2) After the reaction, continue to feed nitrogen gas, the amount of nitrogen gas feeding is 5-200L / h, and the solvent is removed from the material. The temperature is 100°C during the solvent removal, and the vacuum degree is not lower than 650mmHg, and it is refined to obtain.

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PUM

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Abstract

The invention belongs to the technical field of chemical synthesis, and more specifically relates to a method used for preparing isophthaloyl dichloride and paraphthaloyl chloride. The method comprises following steps: m-phthalic acid, terephthalic acid, a catalyst, and thionyl chloride are delivered into a reaction vessel, and nitrogen is delivered into the reaction vessel in a bubbling manner; and after reaction, nitrogen is added continuously, solvents are removed, and an obtained product is subjected to refining so as to obtain a finished product. The method is beneficial for mixing of reaction materials, and rapid discharging of tail gas generated in reaction, so that reaction rate is increased, and it is beneficial for removing of excess solvent.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, in particular to a method for preparing iso / terephthaloyl dichloride. Background technique [0002] At present, the industrial production of terephthaloyl chloride includes the thionyl chloride method of m / terephthalic acid and the photocatalytic chlorination of m / p-xylene, and the current production is dominated by the m / terephthalic acid method. [0003] None of the currently published patents and documents mentions the production of iso / terephthaloyl dichloride by bubbling. Contents of the invention [0004] The purpose of the present invention is to provide a method for preparing iso / terephthaloyl dichloride, which is scientific and reasonable, simple and easy to implement, is beneficial to material mixing, and improves the reaction rate. [0005] The method for preparing inter / terephthaloyl dichloride of the present invention, step is as follows: [0006] (1) Put m / terephthali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/60C07C51/64C07C63/30
CPCC07C51/60C07C51/64C07C63/30
Inventor 谢圣斌李云永孙丰春张善民张泰铭王志亮王荣海刘建村
Owner SHANDONG KAISHENG NEW MATERIALS
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