Process for synthesizing ethyl chloride

A technology of ethyl chloride and process, which is applied in the field of fine chemical synthesis, can solve the problems of hydrogen chloride gas emission, product yield reduction, high reaction temperature, etc., and achieve the effects of reducing pollution, increasing yield, and simplifying process steps

Active Publication Date: 2017-01-18
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patented technologies are all due to their high reaction temperature, which is easy to produce more ether, so that the product yield is reduced, and the hydrogen chloride gas that has not had time to react is discharged into the atmosphere, and a large amount of high-salt wastewater and waste containing organic matter are produced. Acid pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first pot: to 5M 3 Add 460kg of ethanol in the reaction kettle, anhydrous AlCl 3 300kg, 180kg of zinc chloride, heat up to 70°C and keep for 1h to dissolve the catalyst. Then the temperature is raised to 85°C, and 380kg of hydrogen chloride gas in the buffer tank enters the reaction kettle through the flowmeter through the bottom pipe, and the reaction temperature in the kettle is controlled at 85-90°C for 1 hour, and then the temperature is raised to 90-100°C. Reach about 3.5Kg / cm 2 , open the control valve, and the released mixed gas such as ethyl chloride, ethanol, water, etc., is sequentially condensed, pickled, alkali washed, condensed and other processes to obtain ethyl chloride. When the pressure in the kettle drops by 1.1Kg / cm 2 Finally, close the control valve and continue to heat up to 100-110°C for reaction. At this time, the pressure in the kettle reaches 3.7Kg / cm 2 , open the control valve, and the released mixed gas such as ethyl chloride, ethanol,...

Embodiment 2

[0030] The first pot: to 5M 3 Add 460kg of ethanol in the reaction kettle, anhydrous AlCl 3 360kg, 150kg of zinc chloride, heat up to 70°C for 1 hour to dissolve the catalyst. Then the temperature is raised to 85°C, and 400kg of hydrogen chloride gas in the buffer tank enters the reaction kettle through the flowmeter through the bottom pipe, and the reaction temperature in the kettle is controlled at 85-90°C for 1 hour, and the temperature is raised to 90-100°C for reaction. The pressure reaches 3.5Kg / cm 2 , open the control valve, and the released mixed gas such as ethyl chloride, ethanol, water, etc., is sequentially condensed, pickled, alkali washed, condensed and other processes to obtain ethyl chloride. When the pressure drops to 1.2Kg / cm 2 Finally, close the control valve, continue to heat up to 100 ~ 105 ° C reaction, when the pressure in the kettle reaches 3.5Kg / cm 2 , open the control valve, and the released mixed gas such as ethyl chloride, ethanol, water, etc., ...

Embodiment proportion 1

[0034] First pot: according to the scheme of embodiment 1, replace anhydrous AlCl with zinc chloride 480kg 3 300kg, zinc chloride 180kg, other operating procedures are the same. The ethyl chloride yield is 83.9%, which is lower than 90.2% of Example 1.

[0035] Set of pots: operate according to the scheme of Example 1, the ethyl chloride yield is 88.3%. Lower than 95.1% of Example 1.

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PUM

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Abstract

The invention discloses a process for synthesizing ethyl chloride. In a closed reactor, an ethyl chloride product can be obtained from ethanol and hydrogen chloride gas under the catalytic effect of AlCl3-ZnCl2 double component catalyst by gradually heating for reaction, releasing step by step and recovering. The high activity of AlCl3-ZnCl2 double component catalyst is used in the method, reaction temperature and by-product diethyl ether are reduced, and the yield of the ethyl chloride is increased to above 95%; by the use of the hydrogen chloride for replacement of industrial hydrochloric acid, mother liquor and distillate are directly continuously applied, energy consumption for distillation distillate recovery and hydrogen chloride loss are effectively reduced, environment pollution caused by production of a lot of high salt wastewater and organic waste acid can be avoided; in addition, by use of a closed staged heating reaction way, a catalytic substitution reaction is performed in a liquid phase system, substrate contact reaction time is increased, ethanol conversion rate reduction caused by too fast escaping of excessive hydrogen chloride from the reactor can be avoided, the consumption increase of the hydrogen chloride is avoided, and the atmospheric pollution is reduced.

Description

technical field [0001] The invention relates to a new process for synthesizing ethyl chloride, in particular to a process using AlCl 3 -ZnCl 2 The invention relates to a two-component catalyst, which efficiently catalyzes the process of preparing ethyl chloride through the reaction of ethanol and hydrogen chloride gas, and belongs to the technical field of fine chemical synthesis. Background technique [0002] At present, the most commonly used production method of ethyl chloride is in the catalyst ZnCl 2 Under the catalysis of the catalyst, hydrochloric acid and industrial ethanol are added to the enamel reaction kettle in a certain proportion to react, while the unreacted hydrochloric acid, ethanol, water introduced by raw materials, water produced by the reaction and ether are distilled out together with ethyl chloride, and the condensed The distillate also needs to be concentrated by distillation to recover ethanol. Patent document CN103044187A is exactly this method....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/16C07C19/043B01J27/138
CPCB01J27/138C07C17/16C07C19/043
Inventor 赵莹余泽华刘伟赵起袁遥
Owner ANHUI JINGHE IND
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