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Process for producing benzal chloride or chloro benzal chloride

A technology for chlorobenzylidene dichloride and benzylidene dichloride is applied in the field of producing benzylidene dichloride or chlorobenzylidene dichloride, and can solve the problems of complex composition of leftovers, poor product quality, small amount of leftovers and the like, Achieve the effect of low production cost, high conversion rate and high economic benefit

Active Publication Date: 2007-11-14
NANTONG TIANSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, some enterprises use the leftovers containing benzylidene dichloride or chlorinated benzylidene dichloride as raw materials to hydrolyze the production of benzaldehyde or chlorobenzaldehyde by-product during the production of benzyl chloride or chlorobenzyl chloride. The amount of leftovers is small, the output is limited, and the product quality is poor
In addition, due to the complex composition of leftovers, serious environmental pollution

Method used

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  • Process for producing benzal chloride or chloro benzal chloride
  • Process for producing benzal chloride or chloro benzal chloride

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Experimental program
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Effect test

Embodiment 1

[0031] Using the process flow shown in Figure 1, the number of reactors coupled with the rectification tower is 3. The feed of benzyl chloride and chlorine gas are both 1.4 kmol / h, the distribution ratio of chlorine gas in the three reactors is 0.45:0.32:0.23, the top condensation capacity is 1000L / h, and the chlorination reactor temperature is 95°C. The operating pressure of the rectification tower is 0.025MPa, the number of trays in the rectification zone is 9, and the number of trays in the separation zone is 30. After reactive distillation, the molar composition of the tower kettle is: benzyl chloride 0.1%, benzal dichloride 99.4%, benzyl trichloride 0.45%, and cyclodichlorotoluene 0.05%.

Embodiment 2

[0033] Using the process flow shown in Figure 2, a pre-chlorination reactor, the number of reactors coupled with the rectification tower is 3. The feed rate of toluene is 1.4 kmol / h, the feed rate of chlorine is 2.8 kmol / h, the distribution ratio of chlorine in the 4 reactors is 0.65:0.15:0.1:0.1, the top condensation capacity is 1000L / h, and the chlorination reactor The temperature is 80°C, the operating pressure of the rectification tower is 0.05MPa, the number of trays in the rectification zone is 6, and the number of trays in the separation zone is 25. After reactive distillation, the molar composition of the tower kettle is: benzyl chloride 0.2%, benzal dichloride 99.1%, benzylidene trichloride 0.55%, and cyclodichlorotoluene 0.05%.

Embodiment 3

[0035] Using the process flow shown in Figure 1, the number of reactors coupled with the rectification tower is 3. Both o-chlorobenzyl chloride and chlorine gas are 1.4 kmol / h, the distribution ratio of chlorine gas in the three reactors is: 0.5∶0.3∶0.2, the top condensation capacity is 1300 L / h, and the chlorination reactor temperature is 120℃ , The operating pressure of the rectification tower is 0.002MPa, the number of trays in the rectification zone is 6, and the number of trays in the separation zone is 20. After reactive distillation, the molar composition of the tower kettle is: o-chlorobenzyl chloride 0.15%, o-chlorobenzylidene dichloride 99.15%, o-chlorobenzyl chloride 0.55%, and cyclodichlorotoluene 0.15%.

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Abstract

This invention relates to a preparation method of benzal dichloro or chlor-benzal dichloro. The invention process: inlet toluene or chlorotoluene, benzyl chloride or chlor- benzyl chloride and chlorine gas according to certain mol ratio to reactor that coupled with fractionating tower or prechlorination reactor, under series stable operation condition, control the operating pressure of fractionating tower at 0.002 to 0.05MPa. The chlorination is stimulated by sunlight or blue light, temperature of reactor is controlled at 80 to 120 deg.

Description

Technical field [0001] The invention relates to a process method for producing benzal dichloride or chlorobenzylidene dichloride. Specifically, it uses a method of coupling a reactor and a rectifying tower to combine toluene, benzyl chloride or toluene with benzyl chloride The mixture is directly chlorinated with chlorine to generate benzal dichloride, and the mixture of chlorotoluene, chloro benzyl chloride or chlorotoluene and chloro benzyl chloride is directly chlorinated with chlorine to generate chloro benzal dichloride. Background technique [0002] Benzylidene dichloride, also known as benzylidene dichloride, dichlorotoluene or benzylidene chloride, is an important organic synthesis intermediate in the chemical, pharmaceutical, pesticide and other industries. It can be used to produce benzaldehyde, cinnamic acid, and cinnamon. Benpiperazine and others. Its chlorinated derivatives include p-chlorobenzylidene dichloride and o-chlorobenzylidene dichloride, which are important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C22/04C07C17/14
Inventor 乔旭汤吉海崔咪芬陈献
Owner NANTONG TIANSHI CHEM
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