A method for extracting p-chlorobenzoic acid in enone wastewater

A technology of p-chlorobenzoic acid and sodium chlorobenzoate, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc., can solve problems such as environmental pollution, high pressure on wastewater treatment, and achieve high purity Effect
CN104892405BActive Publication Date: 2017-01-04内蒙古沙洲化学科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
内蒙古沙洲化学科技有限公司
Publication Date
2017-01-04

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Abstract

The invention discloses a method for extracting para-chlorobenzoic acid from ketene wastewater, which comprises the following steps: oxidizing sodium para-chlorophenylmethoxide in wastewater to obtain sodium para-chlorobenzoate, stratifying to separate part of organic matters, neutralizing with hydrochloric acid, crystallizing out para-chlorobenzoic acid, purifying by dissolving organic impurities in the crude product into DMF (N,N-dimethylformamide) and methanol to obtain a refined para-chlorobenzoic acid product, and drying to obtain the product. The purity of the product is greater than 99%, which is higher than that of the para-chlorobenzoic acid in the market.
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Description

technical field

[0001] The application belongs to the technical field of chemical industry, in particular to a method for extracting p-chlorobenzoic acid from enone wastewater. Background technique

[0002] Tebuconazole intermediate enone generally adopts p-chlorobenzaldehyde and pinacolone to condense in methanol solution under the condition of sodium hydroxide catalysis, and it is also reported that p-chlorobenzaldehyde, pinacolone, and hydroxide are oxidized Sodium is directly condensed, but the grinding method is quite difficult to implement in large-scale production, and the impact on the environment is much greater than that in the reactor. The method of wastewater treatment is neutralization, sedimentation, and filtration. The wastewater is treated after entering the wastewater treatment .

[0003] The above wastewater treatment method has the following disadvantages: the wastewater treatment pressure is high, and the direct discharge of the wastewater containing p-c...

Claims

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