Process for producing fluohydric acid

Abstract

The present invention relates to one kind of hydrofluoric acid producing process. Ammonium fluoride or ammonium bifluoride and sulfuric acid in the molar ratio of 2 to 1 are mixed and reacted in a reaction furnace at 150-250 deg.c for 2-5 hr, the resultant gas is condensed and purified or absorbed to obtain anhydrous hydrofluoric acid or watered hydrofluoric acid, and the resultant solid is ammonium sulfate product. The present invention adopts side product from phosphate production as material, and has the advantages of rich material and low cost.

Description

technical field

[0001] The invention relates to a method for producing hydrofluoric acid, in particular to a method for producing hydrofluoric acid by using ammonium fluoride or ammonium bifluoride and sulfuric acid as raw materials. Background technique

[0002] Hydrofluoric acid is used in the production of fluorine refrigerants, fluorine-containing resins, organic synthesis (polymerization, condensation, alkylation) accelerated flooding fluorine resins, flame retardants, dye synthesis, and the manufacture of organic or inorganic fluorides, such as fluorocarbons Compounds, aluminum fluoride, uranium hexanitride, cryolite, etc., can not be used for etching glass, electroplating, reagents, fermentation, pottery treatment, and as a catalyst in the petroleum industry, the manufacture of frosted bulbs, and the removal of sand from metal castings , the removal of graphite ash, the cleaning of metals (pickling copper, brass, stainless steel, etc.) Anhydrous hydrofluoric acid is ...