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

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...

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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

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