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Method for synthesizing m-dichlorobenzene from m-dinitrobenzene

A technology of m-dinitrobenzene and m-dichlorobenzene, which is applied in the fields of chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve problems such as difficulty in conformity, complex production process of resorcinol, and low purity. Achieve the effect of easy operation, low production cost and high purity

Inactive Publication Date: 2014-10-08
安徽佑骏商品混凝土有限公司
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Problems solved by technology

The production process for preparing resorcinol in the chemical industry is relatively complicated, and the purity of the production is relatively low, which is difficult to meet the needs of human production and life

Method used

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Embodiment Construction

[0016] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0017] The method for synthesizing m-dichlorobenzene by m-dinitrobenzene is characterized in that: comprising the following processing steps,

[0018] b. Mix meta-dinitrobenzene with copper oxide catalyst and then melt it and put it into the chlorination reaction kettle.

[0019] b. When the temperature in the chlorination reaction kettle is raised to 210-230° C., chlorine gas is passed into the chlorination reaction kettle, and the flow rate of chlorine gas input is controlled at 10 kg / h.

[0020] c. When the material condenses, continue to add m-dinitrobenzene, and the flow rate of addition is controlled at 15kg / h.

[0021] d. Collect the condensate after chlorination in the reactor.

[0022] e. The condensate collected in d is then added to d...

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Abstract

A method for synthesizing m-dichlorobenzene from m-dinitrobenzene relates to the technical filed of the chemical industry. The method comprises the following steps: mixing m-dinitrobenzene with a catalyst, melting the obtained mixture, adding the molten mixture into a chlorination reaction kettle, heating to 210-230DEG C, introducing chlorine into the reaction kettle under a flow of 10kg / h, continuously adding m-dinitrobenzene after material condensation under a flow of 15kg / h, collecting the chlorinated condensate liquid in the reaction kettle, adding weak aqua ammonia to neutralize in order to adjust the pH value to 7, adding water, and washing to obtain crude m-dichlorobenzene; and heating to make the temperature in the kettle reach 100DEG C, carrying out reduced pressure distillation on the crude m-dichlorobenzene to obtain finished m-dichlorobenzene, packaging, and warehousing. The method has the advantages of convenient and simple preparation, small amount of generated waste acids, easily available materials, less equipment investment, high purity, convenient operation and low production cost, and the prepared m-dichlorobenzene has the advantages of good use effect, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for synthesizing m-dichlorobenzene from m-dinitrobenzene. Background technique [0002] m-dichlorobenzene is a colorless liquid with a pungent odor. Insoluble in water, soluble in alcohol and ether. It can carry out chlorination, nitration, sulfonation and hydrolysis reactions. It reacts violently with aluminum and is used in organic synthesis. The reaction between m-dichlorobenzene and chloroacetyl chloride gives 2,4,-trichloroacetophenone, which is used as an intermediate of broad-spectrum antifungal drug miconazole. Chlorination in the presence of ferric chloride or aluminum mercury produces mainly 1,2,4-trichlorobenzene. In the presence of a catalyst, it can be hydrolyzed at 550-850°C to produce m-chlorophenol and resorcinol. Using copper oxide as a catalyst, it reacts with concentrated ammonia water at 150-200°C under pressure to generate m-phenylenedi...

Claims

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Application Information

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IPC IPC(8): C07C17/093C07C25/08
Inventor 刘超金士明赵秀进常好银
Owner 安徽佑骏商品混凝土有限公司
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