High-purity hydrochloric acid production process

Abstract

The invention discloses a high-purity hydrochloric acid production process. The high-purity hydrochloric acid production process comprises the steps that chlorine gas and hydrogen gas are burnt on a combustion table of a synthesis furnace to generate white hydrogen chloride gas, and water in a cooling tower absorbs the hydrogen chloride gas to generate hydrochloric acid with the concentration of 31%; a sodium sulfite solution is dripped from the top of a hydrochloric acid storage tank through a dropping tank and fully reacted with free chlorine; and the processed hydrochloric acid solution enters a resin tower, and after the tower is filled with the acid liquid, excess iron is removed by adsorption to obtain high-purity hydrochloric acid which meets the production requirements. The high-purity hydrochloric acid production process can effectively reduce the content of the free chlorine and the iron in the hydrochloric acid, so that the prepared high-purity hydrochloric acid can meet theprocess condition requirements of a membrane process for producing alkali, the service life of a subsequent reaction device is prolonged, the economic benefit of a company is increased, and obvious advantages are achieved.

Description

technical field [0001] The invention relates to a production process of hydrochloric acid, in particular to a production process of high-purity hydrochloric acid. Background technique [0002] Hydrochloric acid is a colorless or light yellow transparent liquid, volatile, has a pungent odor, is highly corrosive, and is easily soluble in water, alcohol and ether. It can chemically react with metals other than precious metals, and can react chemically with metal oxides, alkalis and most salts. [0003] It is not only useful in ionic membrane caustic soda, but also used in the production of high-purity products such as medicine. In the food industry, it can be used to make condiments such as monosodium glutamate and soy sauce, and to make hydrolyzed alcohol and glucose from starch; it can be used as a decomposition accelerator for bleaching powder liquid in the bleaching of fiber plants in the textile industry; it can be used in the chemical industry to produce inorganic chlori...

AI Technical Summary

Problems solved by technology

In the existing hydrochloric acid production process, the mass fraction of free chlorine in hydrochloric acid remains high, sometimes up to 2×10 -4 , which restricts the application of hydrochloric acid to a large extent. For example, free chlorine has a strong oxidizing ability. If hydrochloric acid with high free chlorine content enters the resin exchange tower, it will cause oxidation of the resin, and even make it lose its activity and cannot be regenerated. It will also lead to the fragmentation of the ion exchange resin, which will eventually lead to the reduction of the quality of the secondary brine and shorten the life of the ion membrane. In addition, the iron content in hydrochloric acid exceeds the standard seriously, which greatly affects the normal operation of the equipment in the caustic soda industry and reduces the life of the equipment. Therefore provide a kind of production technique of high-purity hydrochloric acid, to solve the above technical problems

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