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Sodium alkoxide dechlorinating method for high-chlorine rectification raffinate

A raffinate and rectification technology, applied in the field of chlorinated toluene treatment, can solve the problems that the dechlorination rate can only reach between 10% and 15%, the catalyst cannot be recycled, and the by-product components are complex, etc., and the reaction time needs to be met. Short time, low risk of secondary pollution, good dechlorination effect

Inactive Publication Date: 2017-12-12
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle adopted in this method is to learn from the ammonolysis reaction in chemical synthesis. Under the action of a catalyst, the amination agent is used as a nucleophile to undergo a nucleophilic substitution reaction with chlorinated aromatic hydrocarbons, thereby realizing the dechlorination of chlorinated aromatic hydrocarbons. However, in comparison, the dechlorination effect of this dechlorination method is limited, and the dechlorination rate can only reach between 10% and 15%.
In addition, the catalyst of this method cannot be recycled temporarily, and the composition of the by-products is relatively complex, and the risk of secondary pollution is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 2.0mL of 3,4-dichlorotoluene rectification residue with a chlorine content of 41.33%, add 2.2mL of 95% ethanol to it, mix well, add 0.70g of freshly broken metal sodium, fully react, and carry out 10min of 40kHz Ultrasonic treatment. The treated solution was filtered, washed with pure water and constant volume, and titrated with silver nitrate solution, and the calculated dechlorination rate was 27.78%.

Embodiment 2

[0034] Take 2.0mL of 3,4-dichlorotoluene rectification residue with a chlorine content of 41.33%, add 2.2mL of 95% ethanol to it, mix well, add 1.00g of freshly broken metal sodium, fully react, and carry out 40kHz for 15min Ultrasonic treatment. The treated solution was filtered, washed with pure water and constant volume, and titrated with silver nitrate solution, and the calculated dechlorination rate was 39.06%.

Embodiment 3

[0036] Take 2.0mL of 3,4-dichlorotoluene rectification residue with a chlorine content of 41.33%, add 1.8mL of 95% ethanol to it, mix well, add 1.00g of freshly broken metal sodium, fully react, and carry out 20min of 40kHz Ultrasonic treatment. The treated solution was filtered, washed with pure water and constant volume, and titrated with silver nitrate solution, and the calculated dechlorination rate was 36.11%.

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PUM

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Abstract

The invention discloses a sodium alkoxide dechlorinating method for high-chlorine rectification raffinate. The sodium alkoxide dechlorinating method comprises the following steps that ethyl alcohol and metal sodium are added into the high-chlorine rectification raffinate, and reaction is performed under the ultrasound condition after full mixing. According to the related sodium alkoxide dechlorinating method, the ethyl alcohol and metal sodium reaction and high-chlorine rectification raffinate reaction are combined. A large amount of heat is produced during ethyl alcohol and metal sodium reaction, rectification raffinate and sodium alcoholate reaction is promoted, and dechloridation is achieved. Conditions of the method are simple and convenient and easy to control, the required reaction time is short, a rectification effect is good, and no secondary pollution is produced.

Description

technical field [0001] The invention relates to the field of chlorinated toluene treatment, in particular to a sodium alkoxide dechlorination method for high-chlorine rectification raffinate. Background technique [0002] Halogenated benzene, taking chlorotoluene as an example, is the main product after the liquid phase chlorination of toluene. Through side chain and ring reaction, it can be divided into p-chlorotoluene and o-chlorotoluene (generally the production ratio is close to 1:1). It is used in the manufacture of pesticides, medicines, dyes and other raw materials, and is the source and intermediate of many chemical products. Among them, p-chlorotoluene has a wide range of applications and high product added value, and is a high-value product among chlorotoluene products. However, other by-product rectification raffinate produced in its industrial production process has also become a major problem in the harmless treatment and recovery of industrial high-chlorine re...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/36
CPCC02F1/00C02F1/001C02F1/36C02F9/00C02F2101/36C02F2301/08
Inventor 龙於洋李丽君张铭欣沈东升
Owner ZHEJIANG GONGSHANG UNIVERSITY
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