Preparation technology for hydrogen chloride gas based on concentrated sulfuric acid

Abstract

The invention belongs to the technical field of chemical production and specifically relates to a preparation technology for a hydrogen chloride gas based on concentrated sulfuric acid. A hydrogen chloride gas generator adopted by the invention comprises a reaction tank, a support pillar used for supporting the reaction tank, a sulfuric acid inlet / outlet, a hydrochloric acid inlet / outlet, a hydrogen chloride outlet, a pressure valve, a reciprocating mechanism, a mixing unit, a first spring, a conical isolation hood, a first check valve, a motor and a controller; the controller is used for controlling the generator to work; a heat exchanger is used for absorbing and utilizing heat in the generator, so as to avoid heat accumulation in the generator; a fan is used for blowing heat on the heatexchanger into a dehumidifying pipeline for dehumidifying, so as to further reduce the temperature of the generator; hot air entering into the dehumidifying pipeline is capable of taking away moisture on a water-absorbing paper, so that the water-absorbing paper is capable of continuously drying hydrogen chloride gas, drier hydrogen chloride gas can be acquired and the hydrogen chloride gas willnot be influenced in later use.

Description

Technical field [0001] The invention belongs to the technical field of chemical production, and specifically is a process for preparing hydrogen chloride gas based on concentrated sulfuric acid. Background technique [0002] Hydrogen chloride gas is an important raw material for the production of chlorosulfonic acid in a sulfuric acid plant. The production of hydrogen chloride gas is generally by mixing hydrochloric acid and sulfuric acid, using the strong water absorption of sulfuric acid to absorb the water in the hydrochloric acid, so that the hydrogen chloride gas is precipitated to obtain high purity Of hydrogen chloride gas. [0003] The prior art generally uses the strong water absorption of concentrated sulfuric acid to produce hydrogen chloride gas by spraying and mixing concentrated sulfuric acid and hydrochloric acid. However, when the process produces hydrogen chloride gas, the hydrochloric acid and sulfuric acid are sprayed directly into the overflow reaction tank thro...

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Problems solved by technology

[0004] In order to make up for the deficiencies of the prior art, solve the problem that the produced hydrogen chloride gas still contains a small amount of water and the concentrated sulfuric acid absorbs water to generate a large amount of heat and accumulate in the generator, which is difficult to dissipate; the present invention proposes a hydrogen chloride gas based on concentrated sulfuric acid Gas preparation process

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