Process for fractional crystallization of p-dichlorobenzene

A technology of p-dichlorobenzene and fractional crystallization, which is used in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problem of low product purity, improve processing capacity and product quality, ensure continuity and Stability, effect of reducing sublimation loss

Inactive Publication Date: 2012-12-26
JIANGSU LONGCHANG CHEM
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Problems solved by technology

However, due to the limitation of separation technology in China, the development and application of p-dichlorobenzene is still in the development stage.
At present, the production methods of p-dichlorobenzene commonly used in industry include: freezing method, extraction method, washing method and distillation method, etc., freezing method is the method used more, and the above methods generally have the problem of low product purity, therefore, In order to obtain high-purity p-dichlorobenzene, it is necessary to develop a new separation and purification technology to further purify the product

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  • Process for fractional crystallization of p-dichlorobenzene
  • Process for fractional crystallization of p-dichlorobenzene

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[0023] In order to enable the public to fully understand the technical essence and beneficial effects of the present invention, the applicant will describe in detail the specific implementation of the present invention below in conjunction with the accompanying drawings, but the applicant's description of the embodiments is not a limitation to the technical solution. Changes in the form of the inventive concept rather than in substance should be regarded as the protection scope of the present invention.

[0024] Such as figure 1 , 2 Shown: the present invention relates to a fractional crystallization process of p-dichlorobenzene, the raw materials are 80wt% p-dichlorobenzene, 18wt% ortho-dichlorobenzene, and the rest are low-boiling impurities, using two-stage six-stage melting crystallization Refining, adding the above-mentioned raw materials into the storage tank A, and sending the raw materials into the step-by-step crystallizer C by the pump A for the first-stage crystal...

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Abstract

The invention discloses a process for fractional crystallization of p-dichlorobenzene, and is characterized by taking 80 wt% of p-dichlorobenzene as a raw material, wherein raw materials are refined in a fractional crystallizer by adopting a secondary six-section melt crystallization technology, so that a product with the mass percentage of the p-dichlorobenzene of more than 99.8% is obtained. The process, provided by the invention, has the advantages of simple operation, high product yield, low energy consumption, and easiness in popularization and application.

Description

technical field [0001] The invention relates to a crystallization process, in particular to a fractional crystallization process of p-dichlorobenzene. Background technique [0002] p-dichlorobenzene, molecular formula C 6 h 4 C l2 , white crystal with camphor smell, easy to sublimate at room temperature, soluble in ethanol, ether, benzene, chloroform, carbon disulfide, almost insoluble in water. P-dichlorobenzene is an important raw material for organic synthesis, used to synthesize fuels and pesticide intermediates, and can also be used to produce engineering plastics polyphenylene sulfide. [0003] In foreign countries, p-dichlorobenzene is a fine chemical widely used, and its research has a history of 100 years. However, due to the limitation of separation technology in China, the development and application of p-dichlorobenzene is still in the development stage. At present, the production methods of p-dichlorobenzene commonly used in industry include: freezing metho...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C25/08C07C17/392
Inventor 佘道才许小亮张剑宇
Owner JIANGSU LONGCHANG CHEM
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