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Method for extracting para-chlorobenzoic acid from ketene wastewater

A technology of p-chlorobenzoic acid and chlorobenzoic acid is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc. Effect

Active Publication Date: 2015-09-09
内蒙古沙洲化学科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The above-mentioned wastewater treatment method has the following disadvantages: the wastewater treatment pressure is high, and the direct discharge of wastewater containing p-chlorobenzoic acid will pollute the environment

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  • Method for extracting para-chlorobenzoic acid from ketene wastewater
  • Method for extracting para-chlorobenzoic acid from ketene wastewater

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Embodiment Construction

[0018] The present invention is further illustrated by the following examples: According to the following examples, the present invention can be better understood. However, those skilled in the art can easily understand that the specific material ratios, process conditions and results described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in the claims.

[0019] ginseng figure 1 Shown, in the present embodiment, the method for extracting p-chlorobenzoic acid in enone waste water comprises:

[0020] (1), by means of oxidation, the sodium p-chlorobenzylmethoxide in the enone wastewater is oxidized into sodium p-chlorobenzoate, the oxide compound that adopts in the oxidation process is preferably hydrogen peroxide or potassium permanganate, and the oxidation temperature is 55~60 ℃.

[0021] (2) Separating the bottom organic matter by layering, the temperature in the layering process is 50-55°...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/70C07C51/285C07C51/16C07C51/42
CPCC07C51/16C07C51/285C07C51/42C07C63/70
Inventor 曹爱春赵松雪郁培华
Owner 内蒙古沙洲化学科技有限公司
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