Process for producing fluohydric acid

A technology of hydrofluoric acid and sulfuric acid, applied in the direction of fluorine/hydrogen fluoride, etc., can solve the problems of lack of fluorite and high price of hydrofluoric acid, and achieve the effects of low production cost, abundant resources, good social value and economic value

Inactive Publication Date: 2007-11-28
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional production process of hydrofluoric acid is to use fluorite and sulfuric acid as raw materials. Fluorite is a non-renewable important strategic resource, which is protected by the state and restricted from mining. At present, due to the lack of main raw material fluorite, hydrofluoric acid more expensive than gold

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0016] The method for producing hydrofluoric acid in this embodiment is: mix ammonium fluoride and sulfuric acid in a reaction furnace at a molar ratio of 2:1, ammonium fluoride is a solid with very little water, and the concentration of sulfuric acid is 98%. Above, the reaction temperature is controlled at 180°C, the reaction time is 4 hours, the gas produced by the reaction is condensed and purified or absorbed to obtain anhydrous hydrofluoric acid or hydrofluoric acid with water, and the solid produced by the reaction is ammonium sulfate product.

Embodiment 2

[0018] The method for producing hydrofluoric acid in this embodiment is as follows: ammonium bifluoride and sulfuric acid are mixed and reacted in a reaction furnace at a molar ratio of 2:1, ammonium bifluoride is a solid with very little water, and the concentration of sulfuric acid is more than 98%. The temperature is controlled at 200°C, and the reaction time is 3 hours. The gas produced by the reaction is condensed and purified or absorbed to obtain anhydrous hydrofluoric acid or hydrofluoric acid with water, and the solid produced by the reaction is ammonium sulfate product.

Embodiment 3

[0020] The method for producing hydrofluoric acid in this embodiment is: mix and react ammonium fluoride and sulfuric acid in a reaction furnace at a molar ratio of 2:1, ammonium fluoride is a solid with very little water, and the concentration of sulfuric acid is more than 98%. , the reaction temperature is controlled at 220°C, the reaction time is 2 hours, the gas produced by the reaction is condensed and purified or absorbed to obtain anhydrous hydrofluoric acid or hydrofluoric acid with water, and the solid produced by the reaction is ammonium sulfate product.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/19
Inventor 李世江侯红军杨华春皇甫根利李杰张富山于贺华
Owner DO FLUORIDE CHEM CO LTD
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