A method and device for producing anhydrous hydrogen fluoride and co-producing ammonium sulfate using a solution containing ammonium fluoride

By using low-temperature flash evaporation concentration and gas-acid hydrolysis residue reaction, the problems of high energy consumption and low product purity in the fluorosilicic acid-ammoniation-sulfuric acid decomposition method have been solved, realizing the efficient production of anhydrous hydrogen fluoride and ammonium sulfate and low-cost waste liquid treatment.

CN117566690BActive Publication Date: 2026-03-17GUIZHOU RES INST OF CHEM IND
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Patent Information

Application Number
CN202311447131.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-02
Publication Date
2026-03-17
Estimated Expiration
2043-11-02

AI Technical Summary

Technical Problem

The existing fluorosilicic acid-ammoniation-sulfuric acid decomposition method for preparing anhydrous hydrogen fluoride and ammonium sulfate has problems such as high energy consumption, high escape rate of ammonia and fluorine components, and low purity of ammonium sulfate product.

Method used

A flash concentration tower is used to concentrate ammonium fluoride solution at low temperature, forming NH4HF2 solid, which is then acidified with sulfuric acid. The mixed gas reacts with the acidification residue, lowering the temperature and converting bisulfate ions to sulfate ions. Ammonium sulfate is then concentrated and prepared. By combining heat energy utilization and bisulfate ion absorption, the purity of the product is improved.

Benefits of technology

It reduced energy consumption, improved the purity of ammonium sulfate products, reduced waste liquid treatment costs, and achieved dual recovery and utilization of materials and energy.

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Abstract

The present application relates to the field of fluorine chemical technology, especially to a method and device for producing anhydrous hydrogen fluoride and co-producing ammonium sulfate by using ammonium fluoride solution, wherein ammonia gas-water vapor mixed gas produced by concentrating ammonium fluoride solution in a flash evaporation concentration tower is mixed with high-temperature acidolysis residual liquid produced by acidolysis of ammonium bifluoride with sulfuric acid, so as to fully utilize the heat energy between materials, ensure that the ammonium sulfate component in the acidolysis residual liquid is in a high-temperature flow state, and guarantee the concentration preparation of ammonium sulfate crystals; meanwhile, the ammonia in the ammonia gas-water vapor mixed gas is absorbed by hydrogen sulfate for utilization, the residual amount of hydrogen sulfate in the ammonium sulfate is reduced, the quality of the ammonium sulfate is improved, and the temperature of the waste liquid after the ammonium sulfate is crystallized and filtered is reduced, thereby reducing the waste liquid treatment cost.
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