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Recovery method for chloroethane tail gas in fosetyl-aluminum production

A recovery method, the technology of ethyl chloride, applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of unstable quality and low recovery rate of ethyl chloride, achieve high-quality recovery, improve recovery rate, cost reduction effect

Inactive Publication Date: 2016-06-01
LIMIN CHEM CO LTD
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Problems solved by technology

[0006] Using the above-mentioned pressurized condensation method and low-temperature absorption method to recover ethyl chloride, the recovery rate is low, generally around 50-60%, and the quality of ethyl chloride after recovery is also unstable.

Method used

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  • Recovery method for chloroethane tail gas in fosetyl-aluminum production

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Embodiment Construction

[0022] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0023] figure 1 For the process flow sheet of ethylphosphine aluminum production discharge tail gas recovery method according to the present invention, below will refer to figure 1 , the method for recovering ethyl chloride in the exhaust tail gas of the production of ethylphosphine aluminum of the present invention is described in detail.

[0024] First, in step 101, the tail gas containing ethyl chloride discharged during the production of phosphine aluminum is collected into the tail gas buffer tank.

[0025] In step 102, the tail gas containing ethyl chloride is transported from the tail gas buffer tank to a gas-liquid separator for gas-liquid separation treatm...

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Abstract

The invention provides a recovery method for chloroethane tail gas in fosetyl-aluminum production. The recovery method comprises the following steps that the chloroethane tail gas in fosetyl-aluminum production is subjected to gas-liquid separation through a gas-liquid separator; the chloroethane tail gas after being subjected to gas-liquid separation enters a first-stage condenser to be subjected to condensation treatment, so that the chloroethane tail gas is obtained; the chloroethane tail gas is subjected to alkali washing, drying and compressing; compressed chloroethane enters a second-stage condenser to be subjected to subzero treatment, so that a finished product chloroethane is obtained. The recovery method is environmentally friendly, and moreover, the influence on the environment from production exhaust tail gas is thoroughly avoided. The flow of the method is simple, operation is convenient, cost can be reduced, the recovery rate is increased, recovery quality is improved, and the method has good economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for purifying and recovering ethyl chloride, in particular to a method for recovering ethyl chloride tail gas in the production of ethylphosphine aluminum. Background technique [0002] At present, the total production capacity of ethylphosphine aluminum in China has reached more than 30,000 tons, and the annual by-product of ethyl chloride is more than 5,000 tons, but it is limited to the technical level. At present, the vast majority of domestic phosphine aluminum and diethyl phosphite production enterprises cannot effectively recycle the by-product exhaust gas chloride. With the rapid development of domestic pesticide synthesis, the demand for ethyl chloride is also increasing rapidly. Recycling and Making good use of the ethyl chloride in the tail gas of ethylphosphonium aluminum / diethyl phosphite not only brings considerable economic benefits, but also turns waste into treasure objectively. Ethyl chloride is a col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C19/043
CPCC07C17/38C07C19/043
Inventor 尹拥军郑雪峰张小红杨自明
Owner LIMIN CHEM CO LTD
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