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Method and device for refining crude products of m-phthaloyl chloride

A crude isophthaloyl chloride, isophthaloyl chloride technology, applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds and other directions, can solve the problem of unqualified product indicators, environmental pollution, isophthalic Problems such as small processing capacity of acid chloride refining

Inactive Publication Date: 2012-10-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a continuous rectification process technology and equipment applied to the refining of isophthaloyl dichloride crude product, so as to solve the problems of small isophthaloyl chloride refining treatment capacity, unqualified product index, serious environmental pollution, etc.

Method used

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  • Method and device for refining crude products of m-phthaloyl chloride
  • Method and device for refining crude products of m-phthaloyl chloride
  • Method and device for refining crude products of m-phthaloyl chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Equipment Description: The top condensing device (17) of the light fraction rectification tower and the bottom heating device (16) of the light fraction rectification tower adopt the following figure 1 The external structure shown. The isophthaloyl dichloride product rectifying tower top condensing device (13) and the isophthaloyl dichloride product rectifying tower bottom heating device (12) also adopt such as figure 1 The external structure shown.

[0025] The crude material of isophthaloyl chloride (1) is composed as follows: 70% of isophthaloyl chloride, 26% of thionyl chloride, 1% of DMF, 0.5% of other light components (boiling point lower than isophthaloyl chloride), 0.5% of heavy components (boiling point higher than isophthaloyl chloride) 2.5%. Such as figure 1 As shown, the crude isophthaloyl chloride raw material (1) is sent to the evaporation device (10) via the heating device (9) to evaporate the light component raw material or catalyst, mainly thionyl ch...

Embodiment 2

[0027] Equipment Description: The top condensing device (17) of the light fraction rectification tower and the bottom heating device (16) of the light fraction rectification tower adopt the following figure 2 The built-in structure shown. The isophthaloyl dichloride product rectification tower top condensing unit (13) and the isophthaloyl dichloride product rectification tower bottom heating device (12) adopt such as Figure 5 The built-in structure shown.

[0028]The crude material of isophthaloyl chloride (1) is composed as follows: 65% of isophthaloyl chloride, 28% of thionyl chloride, 3% of pyridine, 1.5% of other light components (boiling point lower than isophthaloyl chloride), recombined points (boiling point higher than isophthaloyl chloride) 2.5%. Such as figure 1 As shown, the crude isophthaloyl chloride raw material (1) is sent to the evaporating device (10) via the heating device (9) to evaporate the light component raw material or catalyst, mainly thionyl chlo...

Embodiment 3

[0030] Device Description:

[0031] The top condensing device (17) of the light fraction distillation column adopts a built-in structure and the bottom heating device (16) of the light fraction distillation column adopts an external structure, such as image 3 shown. The top condensing device (13) of the isophthaloyl chloride product rectification tower adopts a built-in structure and the isophthaloyl dichloride product rectification tower bottom heating device (12) adopts an external structure such as Figure 6 shown.

[0032] The crude material of isophthaloyl chloride (1) is composed as follows: 72% of isophthaloyl chloride, 26% of triphosgene, 1% of DMF, 0.5% of other light components (boiling point lower than isophthaloyl chloride), 0.5% of heavy components (boiling point higher than isophthaloyl chloride) 0.5%. Such as figure 1 As shown, the raw material (1) of isophthaloyl chloride crude product is sent to the evaporation device (10) via the heating device (9) to ev...

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Abstract

The invention relates to a method and a device for refining crude products of m-phthaloyl chloride. The crude products are heated to evaporate light components. The light components with boiling points lower than that of m-phthaloyl chloride are separated from bulk solution through a gasification and transferred into a light components continuous distillation system from an evaporation unit to be refined to obtain a small amount of light components and m-phthaloyl chloride in the tower and the light component products at tower top, which meet the requirements of national standards. The liquid of m-phthaloyl chloride crude products without the light components is transferred into an m-phthaloyl chloride continuous distillation system from the evaporation unit to be refined to obtain m-phthaloyl chloride product with a purity of 99.96% and a yield of over 90% at tower top. With the adoption of the device, a continuous treatment process is realized and the problems of low productivities of a single set of batch or semi-batch refining device and serious environmental pollutions caused by unqualified products are solved.

Description

field of invention [0001] The invention relates to a method and device for refining crude isophthaloyl chloride, in particular to a process and device for refining crude isophthaloyl chloride by adopting a continuous rectification process. Background technique [0002] Isophthaloyl chloride is a relatively important organic industrial raw material, which can be used as a monomer for polyamide, polyester, polyarylate, polyaramid, liquid crystal polymer, aramid fiber 1313 (Nomax), etc. Modifier of polymer, intermediate of pesticide and pharmaceutical industry. With the advancement of polyarylate to industrialization, the increasing application of aromatic polyamide requires an increasing demand for the output and purity of isophthaloyl chloride. [0003] According to the different reaction mechanism, the preparation method of isophthaloyl dichloride starts from acid or from ester, but the difference in the preparation method is mainly the chlorinating agent, mainly thionyl ch...

Claims

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Application Information

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IPC IPC(8): C07C63/24C07C51/64B01D3/14
Inventor 刘丽艳李洪夏芃力
Owner TIANJIN UNIV
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