Technology for deeply resolving by-product hydrochloric acid to prepare hydrogen chloride

Abstract

A technology for deeply resolving by-product hydrochloric acid to prepare hydrogen chloride adopts the flow referring to the attached map, adopts a calcium chloride preparation tank, a calcium chloride solution reboiler and a calcium chloride solution concentration tower, and includes the following steps that the concentrated calcium chloride is heated and enters a desorption tower from the top of the desorption tower, then is in countercurrent contact with by-product hydrochloric acid from bottom to top; a plenty of water enters the calcium chloride solution, hydrogen chloride gas and gas-phase hydrochloric acid are discharged from the top of the desorption tower; the discharged hydrogen chloride gas and gas-phase hydrochloric acid are condensed into concentrated hydrochloric acid and hydrogen chloride gas; the calcium chloride solution discharged from the bottom of the desorption tower is concentrated by the calcium chloride solution concentration tower for recycling. The technology is characterized in that the by-product hydrochloric acid is heated and then vaporized in a vaporization tower, the gas-phase by-product hydrochloric acid enters the desorption tower for resolving, so as to prepare the hydrogen chloride gas, and high boiling point compounds, salts and solid impurities in the by-product hydrochloric acid can be discharged from the bottom of the vaporization tower for wastewater treatment; according to the invention, the by-product hydrochloric acid subjected to wastewater treatment and containing high boiling point compounds, salts and solid impurities is recycled and reused.

Description

technical field [0001] The invention relates to a process for preparing hydrogen chloride by deep analysis of by-product hydrochloric acid. Background technique [0002] Calcium chloride method is a commonly used and mature process for producing hydrogen chloride gas by deep analysis of hydrochloric acid, and its process equipment is as follows figure 1 shown. [0003] However, a large amount of by-product hydrochloric acid produced in industrial production often contains high boiling point compounds, salts and solid impurities. The traditional calcium chloride process equipment is used for deep analysis of the by-product hydrochloric acid. The calcium chloride solution should be recycled, but the impurities in the by-product hydrochloric acid will cause calcium chloride pollution and failure. Calcium chloride needs to be replaced frequently during the treatment process, resulting in high costs. Simultaneously, also can cause the secondary pollution of calcium chloride an...

AI Technical Summary

Problems solved by technology

[0004] Separation of high boiling point compounds, salts and solid impurities in the by-product hydrochloric acid through vapor phase sampling to solve the problem of calcium chloride pollution failure, thereby prolonging the cycle time of calcium chloride in hydrochloric acid deep analysis, improving the use efficiency and reducing the use cost

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