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Method of recovering chlorine and oxygen from chlorine-containing oxygen-containing gas mixture

A technology of mixed gas and chlorine gas, applied in chemical instruments and methods, separation methods, chlorine/hydrogen chloride, etc.

Active Publication Date: 2014-06-04
FININGS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The purpose of the present invention is to overcome the above-mentioned problem that the separation technology of existing chlorine-containing gas exists, to provide a kind of recovery chlorine and oxygen from the mixed gas containing chlorine and oxygen In addition to replacing and completely changing the traditional process of concentrated sulfuric acid drying and dehydration with adsorption and separation technology, the present invention solves the problems of corrosion of equipment materials, difficult treatment of dilute sulfuric acid, low dehydration efficiency, and environmental pollution. and invented the technology of temperature swing pressure swing adsorption (T&PSA) to separate chlorine and oxygen, which not only improves the separation efficiency, but also improves the adsorption capacity of the adsorption tower

Method used

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  • Method of recovering chlorine and oxygen from chlorine-containing oxygen-containing gas mixture
  • Method of recovering chlorine and oxygen from chlorine-containing oxygen-containing gas mixture
  • Method of recovering chlorine and oxygen from chlorine-containing oxygen-containing gas mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0064] The mixed tail gas (feed gas of the present invention) after the product of hydrogen chloride oxidation reaction is absorbed by water to remove unreacted hydrogen chloride (existing production technology) enters the adsorption separation (drying) device to remove residual moisture in the tail gas: can Use a temperature swing adsorption drying device (or a pressure swing adsorption drying device) for drying and dehydration.

[0065] The adsorption tower is filled with a desiccant layer composed of two kinds of adsorbents. One adsorbent is modified SHFL-3 alumina dehydrating agent, and the other is dehydrated and dried 3A molecular sieve (or 5A molecular sieve, silica gel). SHFL -3 type alumina dehydrating agent is placed in the upper part of the adsorption tower, 3A molecular sieve or silica gel is placed in the lower part of the adsorption tower, the volume ratio of SHFL-3 and 3A molecular sieve (or 5A molecular sieve, silica gel) is 20~80% and 80% ~20%.

[0066] Durin...

Embodiment 2

[0096] A method for recovering chlorine and oxygen from a mixed gas containing chlorine and oxygen, comprising: using the product of the hydrogen chloride oxidation reaction (Deacon reaction) to absorb the mixed tail gas after removing unreacted hydrogen chloride as a raw material gas, and pass through two Steps to separate:

[0097] a. The raw material gas is separated and dried by adsorption to remove the residual moisture in the tail gas;

[0098] b. The dry raw material gas after dehydration is separated by temperature and pressure swing adsorption to complete the separation of chlorine and oxygen. The purity of the separated and recovered chlorine gas reaches ≥99.5% (V.%) and the purity of oxygen reaches ≥99.5% (V.%), both of which can meet the quality requirements for direct use as process raw material gas.

[0099] In the step a, a temperature swing adsorption drying device is used, and a composite adsorbent layer composed of two kinds of adsorbents is used in the temp...

Embodiment 3

[0124] A method for recovering chlorine and oxygen from a mixed gas containing chlorine and oxygen, comprising: using the product of the hydrogen chloride oxidation reaction (Deacon reaction) to absorb the mixed tail gas after removing unreacted hydrogen chloride as a raw material gas, and pass through two Steps to separate:

[0125] a. The raw material gas is separated and dried by adsorption to remove the residual moisture in the tail gas;

[0126] b. The dry raw material gas after dehydration is separated by temperature and pressure swing adsorption to complete the separation of chlorine and oxygen.

[0127] In the step a, a temperature swing adsorption drying device is used, and a composite adsorbent layer composed of two kinds of adsorbents is used in the temperature swing adsorption drying process, one kind of adsorbent is an alumina dehydrating agent placed on the upper part of the adsorption tower, and the other It is an adsorbent placed in the lower part of the adsor...

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Abstract

The invention discloses a method of recovering chlorine and oxygen from a chlorine-containing oxygen-containing gas mixture. An exhaust mixture, which is obtained by subjecting reaction products of hydrogen chloride oxidation to water adsorption to remove unreacted hydrogen chloride, is adopted as a raw material gas. The exhaust mixture is separated by a.) a step of subjecting the raw material gas to adsorption, separation and drying to remove residual water in the exhaust; and b.) a step of subjecting the dehydrated gas to temperature- & pressure- swing adsorption to achieve separation of the chlorine and the oxygen, wherein the quality of the separated chlorine and the quality of the separated oxygen both meet quality requirements for being directly used as process raw materials. According to the method, an adsorption separation technology is adopted to replace and thoroughly change a traditional drying dehydration technology with concentrated sulfuric acid, and therefore problems of corrosion to equipment materials, difficult treatment of produced dilute sulfuric acid, low dehydration efficiency, pollution to the environment, and the like are solved. The method also develops a technology of separating the chlorine and the oxygen by utilization of temperature- & pressure- swing adsorption (T&PSA), thus increasing the separation efficiency and enhancing adsorption capability of an adsorption tower.

Description

technical field [0001] The invention relates to the separation and recovery technology of chlorine gas and oxygen in the chloride industry in the field of petrochemical industry, in particular to a method for efficiently separating chlorine gas and oxygen gas from the mixed gas generated by the catalytic oxidation reaction of hydrogen chloride by adopting an adsorption separation method. Background technique [0002] my country is a big producer and consumer of chlorine gas. There are more than 220 domestic manufacturers producing chlorine gas. Some enterprises use chlorine gas for their own use. There are about 150 enterprises that sell commercial chlorine gas. In 2003, the total output was 2.7053 million tons. In 2012, China's total consumption of chlorine gas exceeded 20 million tons, accounting for about 1 / 3 of the world's total chlorine gas consumption. There are more than 200 kinds of chlorine-containing products produced in my country, including more than 100 kinds of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07C01B13/00B01D53/047B01J20/10C01B31/08C01B32/36
Inventor 王农跃冯孝庭邵建明闻国强赵全忠
Owner FININGS CO LTD
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