Comprehensive processing method of vinyl chloride synthetic gas

A comprehensive treatment of vinyl chloride technology, applied in the direction of chlorine/hydrogen chloride, hydrogen halide addition preparation, mercury halide, etc., can solve the problems of high cost and complicated treatment process, achieve short treatment process, convenient process operation, and good for health The effect of development

Active Publication Date: 2012-06-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex treatment process and high cost, only about 20% of the production enterprises currently use this technology for waste acid treatment

Method used

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  • Comprehensive processing method of vinyl chloride synthetic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mercury removal solution is 3.5mol / L MgCl 2 , 1.5mol / L HCl aqueous solution. A combination of 3-stage towers is used for mercury removal, and the synthesis gas enters from the 1st stage and is discharged after passing through the 2nd and 3rd stages in turn; the operating parameters of the three-stage towers are the same.

[0041] Cool the crude vinyl chloride synthesis gas coming out of the tower to 75-78°C; introduce it into a 3-stage tower combination for mercury removal; and then introduce the mercury-removed mixed gas into a 2-stage combination to absorb hydrogen chloride. When the mercuric chloride content in the first-stage mercury removal liquid reaches 40g / L, it is discharged, and the liquid after mercury removal in the second-stage tower is transferred to the first-stage tower, and the liquid after mercury removal in the third-stage tower is transferred to the second stage tower, and the third-stage tower is replaced with a new mercury removal solution.

[00...

Embodiment 2

[0046] Mercury removal solution is 4.2mol / L CaCl 2 , 0.1mol / L HCl aqueous solution. The combination of two-stage towers is used for mercury removal, and the synthesis gas enters from the first stage and is discharged after passing through the second stage; the operating parameters of the two towers are the same.

[0047] Cool the crude vinyl chloride synthesis gas out of the tower to 45-50°C; introduce it into a 2-stage tower combination for mercury removal; and then introduce the mercury-removed mixed gas into a 2-stage combination to absorb hydrogen chloride. When the mercury chloride content in the mercury removal liquid of the first stage of mercury removal reaches 30g / L, it is discharged, and the liquid after mercury removal in the second stage tower is transferred to the first stage tower, and the second stage tower is replaced with a new mercury removal liquid.

[0048] After removing hydrogen chloride, the mixed gas is removed by cyclone to remove acid mist, alkali wa...

Embodiment 3

[0052] Mercury removal solution is 4.0mol / L CaCl 2 , 0.5mol / L HCl aqueous solution. Two-stage combined towers are used for mercury removal, and the synthesis gas enters from the first stage and is discharged after passing through the second stage; the operating parameters of the two-stage towers are the same.

[0053] Cool the crude synthesis gas out of the tower to 60-65°C; introduce it into a 2-stage combined tower for mercury removal; When the mercury chloride content in the first-stage mercury removal liquid reaches 30g / L, it is discharged, and the second-stage mercury removal liquid is transferred to the first-stage tower, and the second-stage mercury removal liquid is replaced with a new one.

[0054] After removing hydrogen chloride, the mixed gas is removed by cyclone to remove acid mist, alkali washing and neutralization, and cyclone to remove water mist to obtain refined vinyl chloride.

[0055] The composition of the discharged mercury removal liquid is: HgCl 2 ...

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Abstract

The invention discloses a comprehensive processing method of vinyl chloride synthetic gas. Under the effect of a mercuric chloride catalyst, acetylene gas and hydrogen chloride are subject to a reaction, such that crude vinyl chloride synthetic gas is produced; the crude vinyl chloride synthetic gas is subject to mercury removing by using a high-concentration chloride containing hydrochloric acid; hydrogen chloride is absorbed by using water; the crude vinyl chloride synthetic gas is then subject to steps such as alkali washing and dehydration, such that refined vinyl chloride is obtained, and requirements of mercury recovering, qualified industrial hydrochloric acid production and vinyl chloride refining are directly achieved.

Description

technical field [0001] The invention relates to a method for comprehensively treating vinyl chloride synthesis gas, which is a method for product separation, purification treatment and recovery of valuable (poisonous) substances, and belongs to the field of chemical engineering. Background technique [0002] Polyvinyl chloride is one of the five general-purpose plastics, widely used in important fields such as industry, agriculture, national defense, and chemical building materials. At present, the total production capacity of polyvinyl chloride in my country is about 18 million tons, of which the production capacity of calcium carbide method is about 14 million tons, accounting for more than 75% of the total production capacity; the actual production of calcium carbide method PVC accounts for about 65% of the total production of polyvinyl chloride. [0003] The calcium carbide method used to produce polyvinyl chloride uses activated carbon-loaded mercuric chloride catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/06C07C17/08C01G13/04C01B7/01
Inventor 胡启阳李新海郭华军王志兴
Owner CENT SOUTH UNIV
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