Preparation method of anhydrous hydrogen chloride

Abstract

The invention relates to a preparation method of anhydrous hydrogen chloride. The preparation method comprises a hydrogen chloride / hydrochloric acid desorption section and a hydrogen chloride drying section, wherein hydrochloric acid enters a hydrochloric acid / hydrogen chloride desorption tower, water and hydrogen chloride in a gas phase are separated through an acid / hydrogen chloride desorption tower, the concentration of hydrogen chloride at an outlet is controlled to be larger than that of vapor, and then hydrogen chloride enters a hydrogen chloride deep-desorption tower; hydrogen chloride gas in a self-desorption section enters a filler drying tower to be treated and then enter a combination drying tower to be dried, and the amount of sulfuric acid entering the tower is controlled through an on-line moisture analysis system, so that the concentration of circulating sulfur in a circulating drying tower is controlled. The preparation method is economical and reliable, the corrosion problem of equipment can be effectively controlled, the economic value of the byproduct hydrochloric acid can be greatly increased, the operation life of the device can be prolonged, and the maintenance and operation costs are reduced.

Description

technical field [0001] The invention relates to a method for preparing hydrogen chloride, in particular to a method for preparing anhydrous hydrogen chloride. Background technique [0002] Hydrochloric acid is a kind of basic chemical raw material, and its main sources are: the synthesis of hydrogen chloride from caustic soda to prepare hydrochloric acid; chlorine gas to replace hydrogen atoms on organic matter to generate a molecule of hydrogen chloride to prepare hydrochloric acid; potassium chloride in the potassium sulfate industry to react with concentrated sulfuric acid to produce hydrochloric acid by-product hydrogen chloride; four Silicon chloride reacts with hydrogen and air to produce hydrogen chloride by-product. [0003] According to the statistics of caustic soda for the whole year of 2014, the annual production of caustic soda is 31.8 million tons, which is equivalent to about 28 million tons of chlorine gas, while the production of PVC in my country in 2014 is...

AI Technical Summary

Problems solved by technology

Molecular sieve drying technology is used to prepare anhydrous hydrogen chloride in the market. The main component of molecular sieve is the skeleton structure of aluminosilicate crystal sintering. While absorbing the moisture in hydrogen chloride, hydrogen chloride will dissolve in water to form acidic hydrochloric acid and corrode the skeleton. , Molecular sieve corrosion occurs after two to three years of use, so this process is not suitable for hydrogen chloride gas dehydration

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