Method for producing 2,4-dichloroacetophenone by using solid waste chlorobenzene tar as raw material

A technology of dichloroacetophenone and chlorinated benzene tar, which is applied in the direction of organic chemistry and condensation preparation of carbonyl compounds, etc., can solve the problems of no discovery and report, and achieve the effect of alleviating the pressure of supply and demand

Inactive Publication Date: 2010-12-01
JIANGSU LONGCHANG CHEM
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Problems solved by technology

In order to meet the market's demand for products, a production method of using m-dichlorobenzene as raw material to produce 2,4-dichloroacetophenone is being sought, and no relevant reports have been found so far

Method used

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Embodiment Construction

[0008] The steps of utilizing solid waste chlorinated benzene tar to reclaim m-dichlorobenzene are as follows:

[0009] After pretreatment, the chlorinated benzene tar is fed into the rectification tower. The temperature at the top of the rectification tower is controlled at 55±2°C, the temperature at the bottom of the tower is controlled at 100±2°C, and the vacuum degree is controlled at 10KPa to promote the chlorinated benzene tar. The light components before p-dichlorobenzene are evaporated from the top of the tower, and collected in the light component material storage tank after being condensed by the cooler. After the gas chromatograph detects that there is no light component in the dichlorobenzene, the rich chlorobenzene is taken out. sent to the next distillation column. The temperature at the top of the rectification tower is controlled at 90±2° C., the temperature at the bottom of the tower is controlled at 115±2° C., the vacuum degree is controlled at 10 KPa, and r...

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Abstract

The invention discloses a method for producing 2,4-dichloroacetophenone by using solid waste chlorobenzene tar as a raw material. The method mainly comprises the following steps of: extracting m-dichlorobenzene from the solid waste chlorobenzene tar, and then performing five steps of acylation, washing, distillation, crystallization and packing in the 2,4-dichloroacetophenone production process. The method is characterized in that: the acylation reaction comprises that: the m-dichlorobenzene and acetyl chloride undergo the acylation reaction under the action of anhydrous aluminum trichloride, the dripping temperature of the acetyl chloride is kept between 50 and 60 DEG C during reaction, the temperature is gradually raised to between 90 and 95 DEG C after the dripping is finished, and reflux stirring reaction is performed for about 4 hours to obtain the 2,4-dichloroacetophenone. The method has the advantages that: the m-dichlorobenzene is reclaimed from the solid waste chlorobenzene tar during production, and the reclaimed m-dichlorobenzene is used as the raw material for producing the 2,4-dichloroacetophenone, so by the method, the 2,4-dichloroacetophenone is produced by using the m-dichlorobenzene as the raw material while extra worries of m-dichlorobenzene and o-dichlorobenzene production enterprises are solved, the supply and demand pressure of chlorobenzene markets is relieved and extended products are further developed and utilized.

Description

technical field [0001] The main task of the present invention is to provide a kind of production method of 2,4-dichloroacetophenone, specifically a kind of method utilizing solid waste chlorinated benzene tar to produce 2,4-dichloroacetophenone as raw material. Background technique [0002] 2,4-Dichloroacetophenone is the raw material for the preparation of ω-bromo-2,4-dichloroacetophenone or ω-2,4-trichloroacetophenone, the latter two are used for the preparation of imazalil and propane It is the intermediate of fungicides such as azole and etoconazole, and it is also the intermediate of insecticide chlorpyramid and herbicide wild swallow. m-dichlorobenzene is the main raw material for the synthesis of 2,4-dichloroacetophenone. [0003] Domestic and foreign enterprises that produce chlorinated benzene, p-dichlorobenzene and o-dichlorobenzene basically adopt the benzene chlorination process, and side reactions inevitably occur during the chlorination process, producing by-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/807C07C45/46
Inventor 王兆昌吴春江
Owner JIANGSU LONGCHANG CHEM
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