Method for recovering bromine tail gas and chlorine gas in bromine production

Abstract

The invention relates to a method for recovering bromine tail gas and chlorine gas in bromine production, which is characterized by using acid liquor as an absorbing agent to absorb the chlorine gas and the bromine in a tail gas. The method has the following advantages: the utilization rate of chlorine is improved by effectively dissolving part of the chlorine in a complete solution by absorbing the tail gas with an absorption complete solution, and saving the introduction amount of the chlorine gas for oxidization when the complete solution enters a distillation tower, and such item can save200,000 yuan of financial resources each year; a bromine finished product is effectively recovered, wherein the bromine content in the emptied bromine vapor reaches up to 98.8 percent, the emptied bromine vapor is completely kept in the complete solution by an absorption tower, the bromine finished product is formed through distillation and cooling, and only such item saves about 400,000 yuan of financial resources; and the problems of environmental pollution are solved by absorbing the tail gas with the complete solution, and absorbing the tail gas with an alkali lye at the absorption tail end so as to achieve the zero release of chlorine and bromine of the emptied tail gas.

Description

technical field [0001] The invention belongs to the production and manufacture of bromine, in particular to a method for recovering bromine tail gas and chlorine gas in bromine production. Background technique [0002] Bromine is a brownish red or dark brown liquid, volatile at room temperature, toxic, slightly soluble in water, easily soluble in organic solutions such as hydrochloric acid and hydrobromic acid. During the production of bromine for many years, the production tail gas of the distillation process has been evacuated. This method not only causes product loss and cost increase, but also brings serious pollution to the atmosphere. Based on the calculation of the emptying capacity of a 1,000-ton air-blown bromine production line in a certain salt field every year, about 20 tons of bromine tail gas and chlorine gas are discharged into the atmosphere each year. The method is to adopt white water absorption or bittern absorption, and white water absorption cannot be d...

AI Technical Summary

Problems solved by technology

[0003] The present invention is to overcome the deficiencies in the prior art, and provides a method for recovering bromine tail gas and chlorine gas in bromine production. Using the absorption completion liquid to absorb the tail gas can effectively dissolve part of the chlorine in the completion liquid, and make the exhaust The empty bromine vapor is completely left in the finished liquid, and the finished product bromine is formed after distillation and cooling, which solves the problem of environmental pollution

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