Combined absorption analytical method for hydrochloric acid

Abstract

The invention relates to a hydrochloride combined absorption and analytic method, which includes the following steps: concentrated hydrochloric acid in a concentrated hydrochloric acid tank enters into a concentrated acid analytic tower through a pump and a double-effect heat exchanger to be analyzed, and partial hydrogen chloride gas is obtained; the no-analyzed dilute hydrochloric acid enters into a dilute acid tank through the double-effect heat exchanger and a cooler; calcium chloride solution in dilute hydrochloric acid and calcium chloride concentration towers goes through a pump, is mixed and enters into a dilute acid tower to be analyzed, the hydrogen chloride gas is obtained; the dilute calcium chloride solution with trace hydrochloride in a dilute hydrochloride analytic tower enters into the calcium chloride concentration tower to be concentrated, waste water within hydrochloride meeting the emission standard is obtained; the concentrated calcium chloride flows back to a calcium chloride preparing tank. The invention improves the recovery rate (99.99 percent) of the hydrogen chloride, reduces the neutralization procedure, resource waste and environmental pollution of the waste water, and can also used together with the processes of the upstream industry.

Description

technical field [0001] The invention relates to a method for producing hydrogen chloride from hydrochloric acid, in particular to a method for recovering hydrogen chloride from waste hydrochloric acid and reducing pollution. Background technique [0002] At present, in many industrial production processes, such as petroleum, chemical industry, metallurgy, papermaking, machinery, dyes and other industries, a large amount of hydrochloric acid with different concentrations will be produced. Usually, domestic enterprises adopt methods such as reabsorption, storage, and sales to process hydrochloric acid. , because the hydrochloric acid produced contains a certain amount of impurities, the scope of use of hydrochloric acid is limited, not only the price is low but also difficult to sell, and the sale of dilute hydrochloric acid is even more difficult. Some enterprises adopt the method of neutralizing and discharging waste acid, which not only wastes energy and increases the cost ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor treatment and recycling of waste hydrochloric acid, low economic benefits, and environmental pollution in the prior art, and to provide a more thorough treatment and recycling of waste hydrochloric acid, high economic benefits, and low environmental pollution. Hydrochloric acid combined absorption analysis method with small size, reasonable process design and easy operation

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