Method for preparing high-purity hydrogen chloride gas

Abstract

The invention relates to the field of technologies for preparing chemical materials, in particular to a method for preparing high-purity hydrogen chloride gas. The method for preparing the high-purity hydrogen chloride gas includes steps of (1), adding 98% concentrated sulfuric acid and potassium chloride into Mannheim furnaces, heating the Mannheim furnaces, continuously stirring the concentrated sulfuric acid and the potassium chloride to uniformly mix the concentrated sulfuric acid and the potassium chloride with each other and allowing the concentrated sulfuric acid and the potassium chloride to sufficiently react to each other so as to generate potassium sulfate; (2), arranging the potassium sulfate generated in the step (1) by means of reaction in closed coolers, neutralizing the potassium sulfate by the aid of lime, smashing the potassium sulfate and then packaging the potassium sulfate to obtain finished products; (3), leading hydrogen chloride generated in the step (1) by means of reaction into absorption working procedures. The method for preparing the high-purity hydrogen chloride gas has the advantages that the hydrogen chloride is high in purity and low in purity fluctuation, does not contain free chlorine and is prepared at high temperatures, and concentrated hydrochloric acid is high in corrosion under high-temperature conditions.

Description

technical field [0001] The invention relates to the technical field of chemical material preparation, in particular to a method for preparing high-purity hydrogen chloride gas. Background technique [0002] Hydrogen chloride is an important part of the chlorine industry. Most of the hydrogen chloride in the United States, Europe, Japan and other places is produced in the form of by-product hydrogen chloride, and most of the by-product hydrogen chloride is recycled to the process system and does not enter the market. According to statistics, there are more than 40 processes that produce hydrogen chloride as a by-product and 110 processes that use hydrogen chloride as a raw material. However, in my country, with the rapid development of the chlorine industry, especially the rapid expansion of the scale of organic chlorine products in the past ten years, the total amount of by-product hydrogen chloride is increasing year by year. Production of hydrochloric acid or further refi...

AI Technical Summary

Problems solved by technology

However, in my country, with the rapid development of the chlorine industry, especially the rapid expansion of the scale of organic chlorine products in the past ten years, the total amount of by-product hydrogen chloride is increasing year by year. Production of hydrochloric acid or further refining to prepare high-purity hydrogen chloride. At present, the market for high-purity hydrogen chloride is relatively good, but the market for hydrochloric acid exceeds demand, and the by-product hydrochloric acid is a cheap way, so individual companies sell by-product hydrogen chloride or hydrochloric acid when it becomes a burden. It will sacrifice the environment in exchange for the interests of the enterprise. Obviously, this method is outdated. At the same time, the pickling process of steel, electroplating and steel structural parts, chemical pharmaceuticals, and rare earth production processes will discharge a large amount of low-concentration waste hydrochloric acid. The waste liquid is generally neutralized. Discharge after treatment by means of treatment, not only the treatment cost is high, but also a waste of resources, resulting in secondary pollution, which is not conducive to the protection of the environment and the sustainable development of resources and energy. Therefore, it is necessary to recycle the waste hydrochloric acid generated in the production process.