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Process for producing benzal chloride or chloro benzal chloride

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

Active Publication Date: 2009-08-26
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

Examples

Experimental program
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Effect test

Embodiment 1

[0031] use as figure 1 In the process flow shown, the number of reactors coupled with the rectification tower is 3. Benzyl chloride and chlorine feed are both 1.4kmol / h, the distribution ratio of chlorine in the three reactors is: 0.45:0.32:0.23, the tower top condensation is 1000L / h, and the temperature of the chlorination reactor 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: 0.1% benzyl chloride, 99.4% benzylidene dichloride, 0.45% benzyl trichloride, and 0.05% cyclodichlorotoluene.

Embodiment 2

[0033] use as figure 2 In the process flow shown, there is one pre-chlorination reactor, and the number of reactors coupled with the rectification tower is 3. The toluene feed is 1.4kmol / h, the chlorine feed is 2.8kmol / h, the distribution ratio of chlorine in the four reactors is 0.65:0.15:0.1:0.1, and the condensation at the top of the tower is 1000L / h, the chlorination reactor The temperature is 80°C, the operating pressure of the rectification tower is 0.05 MPa, 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: 0.2% benzyl chloride, 99.1% benzylidene dichloride, 0.55% benzyl trichloride, and 0.05% cyclodichlorotoluene.

Embodiment 3

[0035] use as figure 1 In the process flow shown, the number of reactors coupled with the rectification tower is 3. O-chlorobenzyl chloride and chlorine are both 1.4kmol / h, the distribution ratio of chlorine in the three reactors is: 0.5:0.3:0.2, the condensation at the top of the tower is 1300L / h, and the temperature of the chlorination reactor is 120°C. 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: 0.15% o-chlorobenzyl chloride, 99.15% o-chlorobenzylidene dichloride, 0.55% o-chlorobenzyl trichloride, and 0.15% cyclodichlorotoluene.

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Abstract

The invention discloses a method for producing benzylidene dichloride or chlorobenzylidene dichloride. In the method, toluene or chlorotoluene, benzyl chloride or chlorinated benzyl chloride and chlorine gas are continuously introduced into the mixture according to a certain molar ratio. In the reactor coupled with the rectification tower or the pre-chlorination reactor, under continuous and stable operating conditions, the operating pressure of the rectification tower is controlled at 0.002-0.05MPa, the chlorination reaction is initiated by sunlight or blue light, and the temperature in the reactor is 80~120℃. The mole fraction of benzylidene dichloride or chlorinated benzylidene dichloride continuously discharged from the tower kettle reaches more than 99%. The process of the invention has the advantages of short process flow, independent operating conditions of the reactor and the rectifying tower, and flexible control; high conversion rate of raw materials, high selectivity of benzylidene dichloride or chlorinated benzylidene dichloride; low production cost and high economic benefit.

Description

technical field [0001] The invention relates to a process for producing benzylidene dichloride or chlorobenzylidene dichloride, specifically, toluene, benzyl chloride or toluene and benzyl chloride The mixture is directly chlorinated with chlorine gas to generate benzylidene dichloride, and the mixture of chlorotoluene, chlorobenzyl chloride or chlorotoluene and chlorobenzyl chloride is directly chlorinated with chlorine gas to generate chlorobenzylidene dichloride. Background technique [0002] Benzylidene dichloride, also known as benzylidene dichloride, dichlorotoluene or benzylidene chloride, is an important organic synthesis intermediate in chemical, pharmaceutical, pesticide and other industries, and can be used to produce benzaldehyde and cinnamic acid, cinnamon phenylpiperazine etc. Its chlorinated derivatives include p-chlorobenzylidene dichloride and o-chlorobenzylidene dichloride, which are important intermediates for the production of p-chlorobenzaldehyde and o-...

Claims

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Application Information

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Patent Type & Authority Patents(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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