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Method for treating ethylene acidolysis tail gas

An ethephonic acid and tail gas technology, applied in separation methods, chemical instruments and methods, chlorine/hydrogen chloride and other directions, can solve the problems of insufficient utilization of hydrogen chloride, restrict the use of hydrochloric acid, environmental pollution, etc., and achieve good economic benefits, The effect of reducing consumption and improving social benefits

Active Publication Date: 2014-11-12
SHAOXING EASTLAKE HIGH TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrochloric acid absorbed by acidolysis tail gas also contains dichloroethane, which seriously restricts the use of the hydrochloric acid and causes great pollution to the environment.
At the same time, the hydrogen chloride in the tail gas cannot be fully utilized

Method used

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  • Method for treating ethylene acidolysis tail gas
  • Method for treating ethylene acidolysis tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) At room temperature, the acid hydrolysis tail gas containing 97% hydrogen chloride, 2.9% dichloroethane, and 800ppm water is passed into the enamel chip condenser at a flow rate of 60kg / h for freezing and deep cooling, and the condenser heat exchange With an area of ​​8 square meters, the outer layer of the condenser passes through frozen brine at -10~-12°C, and the inner layer passes through the tail gas of ethephon acid hydrolysis. Dichloroethane 1.4%, water content 198ppm Ethephon acid hydrolysis tail gas after cryogenic cooling.

[0035] (2) Pass the ethephon acid hydrolysis tail gas after step (1) deep cooling into the concentrated sulfuric acid drying tower, the concentrated sulfuric acid drying tower includes a shell and a packing layer, and the top of the concentrated sulfuric acid drying tower is equipped with Gas port and concentrated sulfuric acid inlet, the bottom of the tower is provided with an air inlet and a concentrated sulfuric acid outlet, the inl...

Embodiment 2

[0039] In step (2), the flow rate of ethephon acid hydrolysis tail gas is 120kg / h, the concentrated sulfuric acid drying tower is equipped with ceramic Raschig ring packing, the concentrated sulfuric acid spraying rate is 1200kg / h, and the concentrated sulfuric acid drying tower outlet gas ethephon acid hydrolysis tail gas The water content in the medium is 3.0PPm, and other operations and parameters are the same as in Example 1. After compression, 0.5Mpa and 99.9% hydrogen chloride acid hydrolysis tail gas is obtained, which is recycled to the ethephon acid hydrolysis process.

Embodiment 3

[0041] In step (2), the flow rate of ethephon acid hydrolysis tail gas is 200kg / h, the concentrated sulfuric acid drying tower is equipped with ceramic Pall ring packing, the concentrated sulfuric acid spraying rate is 1400kg / h, and the concentrated sulfuric acid drying tower gas outlet ethephon acid hydrolysis tail gas The water content in the medium is 4.0PPm, and other operations and parameters are the same as in Example 1. After compression, 0.6Mpa and 99.9% hydrogen chloride acid hydrolysis tail gas is obtained, which is recycled to the ethephon acid hydrolysis process.

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Abstract

The invention discloses a method for treating ethylene acidolysis tail gas. The method comprises the following steps: performing freezing and copiously cooling, concentrated sulfuric acid drying, carbon fiber adsorption and compression on ethylene acidolysis tail gas with hydrogen chloride content more than 97%, dichloroethane content less than 3% and water content less than 800ppm to obtain hydrogen chloride acidolysis tail gas with hydrogen chloride content more than 99%, dichloroethane content less than 10ppm and water content less than 5ppm; and recycling to an ethylene acidolysis process. compared with the prior art using film-falling tower to adsorb ethylene acidolysis tail gas, the method disclosed by the invention has effects of eliminating the production of waste hydrochloric acid containing dichloroethane and controlling the environment pollution in the production process of ethylene from the source, and has good social benefit. The method disclosed by the invention realizes the efficient and cleaning production with low cost, satisfies the industry policy of energy conservation and emission reduction and sustainable development of the nation.

Description

(1) Technical field [0001] The invention relates to a treatment method for acidolysis tail gas, in particular to a method for treating ethephon acidolysis tail gas. (2) Background technology [0002] The last step of the acid hydrolysis production process of the plant growth regulator ethephon is to inject pressurized hydrogen chloride gas into 2-chloroethyl phosphonic acid bis-(2-chloroethyl) ester to react to form ethephon, and simultaneously produce di Ethyl chloride, the reaction equation is as follows: [0003] [0004] According to the above reaction, there is a large excess of hydrogen chloride gas in the actual production process. After recovering the by-product dichloroethane, the composition of the tail gas of ethephon acid hydrolysis is as follows: the content of hydrogen chloride is greater than 97%, and the content of dichloroethane is less than 3%. , the water content is less than 800PPm. [0005] In order to reuse the above-mentioned ethephon acid hydroly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D53/26B01D53/14B01D53/02C01B7/07
Inventor 季国炎丁成荣张国富季盛张伟季国尧季小英
Owner SHAOXING EASTLAKE HIGH TECH CO LTD