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Preparation method of high-purity hydrofluoric acid

A hydrofluoric acid, pure-grade technology, applied in hydrogen fluoride, fluorine/hydrogen fluoride, etc., can solve the problems of reducing the purity of hydrofluoric acid preparation, and achieve the effects of speeding up cooling efficiency, improving reaction efficiency, and improving purity

Pending Publication Date: 2021-08-06
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the disadvantages in the prior art that in the preparation process of hydrofluoric acid, it is not convenient to fully remove impurities from the liquid hydrogen fluoride solution, thereby reducing the preparation purity of hydrofluoric acid, and propose a high-purity grade The preparation method of hydrofluoric acid

Method used

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  • Preparation method of high-purity hydrofluoric acid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] refer to figure 1 , a preparation method of high-purity grade hydrofluoric acid, comprising the following steps:

[0031] S1: Mix the dried fluorite powder and sulfuric acid according to the ratio;

[0032] S2: heating the reaction furnace;

[0033] S3: Send the mixed fluorite powder and sulfuric acid into the reaction furnace for reaction;

[0034] S4: transporting the reacted gas to the crude distillation tower for crude distillation;

[0035] S5: Transport the crudely distilled gas to the degassing tower for condensation;

[0036] S6: Transport the liquid hydrogen fluoride to the rectification tower for rectification;

[0037] S7: Condensing and separating the hydrofluoric acid to remove impurities.

[0038] In this embodiment, in S1, the fluorite powder is fully dried by the drying mechanism, and then the dried fluorite powder and sulfuric acid are weighed by a weighing instrument, and the fluorite powder and sulfuric acid are mixed by the stirring mechanism. ...

Embodiment 2

[0048] refer to figure 1 , a preparation method of high-purity grade hydrofluoric acid, comprising the following steps:

[0049] S1: Mix the dried fluorite powder and sulfuric acid according to the ratio;

[0050] S2: heating the reaction furnace;

[0051] S3: Send the mixed fluorite powder and sulfuric acid into the reaction furnace for reaction;

[0052] S4: transporting the reacted gas to the crude distillation tower for crude distillation;

[0053] S5: Transport the crudely distilled gas to the degassing tower for condensation;

[0054] S6: Transport the liquid hydrogen fluoride to the rectification tower for rectification;

[0055] S7: Condensing and separating the hydrofluoric acid to remove impurities.

[0056] In this embodiment, in S1, the fluorite powder is fully dried by the drying mechanism, and then the dried fluorite powder and sulfuric acid are weighed by a weighing instrument, and the fluorite powder and sulfuric acid are mixed by the stirring mechanism. Ac...

Embodiment 3

[0066] refer to figure 1 , a preparation method of high-purity grade hydrofluoric acid, comprising the following steps:

[0067] S1: Mix the dried fluorite powder and sulfuric acid according to the ratio;

[0068] S2: heating the gas phase temperature in the reaction furnace;

[0069] S3: Send the mixed fluorite powder and sulfuric acid into the reaction furnace for reaction;

[0070] S4: transporting the reacted gas to the crude distillation tower for crude distillation;

[0071] S5: Transport the crudely distilled gas to the degassing tower for condensation;

[0072] S6: Transport the liquid hydrogen fluoride to the rectification tower for rectification;

[0073] S7: Condensing and separating the hydrofluoric acid to remove impurities.

[0074] In this embodiment, in S1, the fluorite powder is fully dried by the drying mechanism, and then the dried fluorite powder and sulfuric acid are weighed by a weighing instrument, and the fluorite powder and sulfuric acid are mixed...

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Abstract

The invention belongs to the field of preparation of hydrofluoric acid, particularly relates to a preparation method of high-purity hydrofluoric acid, and provides the following scheme aiming at the problem that the purity of the prepared hydrofluoric acid solution is reduced due to the fact that a liquid hydrogen fluoride solution is inconvenient to fully and quickly remove impurities in the existing hydrofluoric acid preparation process. The method comprises the following steps that S1, mixing dried fluorite powder and sulfuric acid in proportion; s2, heating a reaction furnace; s3, feeding the mixed fluorite powder and sulfuric acid into the reaction furnace for reaction; s4, conveying reacted gas into a crude distillation tower for crude distillation; s5, conveying the gas subjected to crude distillation into a degassing tower for condensation; s6, conveying the liquid hydrogen fluoride into a rectifying tower to be rectified; s7, subjecting hydrofluoric acid to condensation separation to remove impurities. According to the invention, the liquid hydrogen fluoride solution can be subjected to sufficient and rapid impurity removal conveniently, and therefore the purity of the prepared hydrofluoric acid solution can be improved.

Description

technical field [0001] The invention relates to the technical field of hydrofluoric acid preparation, in particular to a preparation method of high-purity hydrofluoric acid. Background technique [0002] Hydrofluoric Acid is an aqueous solution of hydrogen fluoride gas, a clear, colorless, fuming corrosive liquid with a strong pungent odor. Hydrofluoric acid is a weak acid that is extremely corrosive and can aggressively attack metals, glass, and objects containing silicon. Inhalation of vapors or contact with skin may cause irreversible burns. The laboratory generally uses fluorite (the main component is calcium fluoride) and concentrated sulfuric acid to make it, and it needs to be sealed in a plastic bottle and stored in a cool place. Due to its ability to dissolve oxides, hydrofluoric acid plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, engraving patterns, marking scales and characters; the semiconduct...

Claims

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Application Information

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IPC IPC(8): C01B7/19
CPCC01B7/192C01B7/195C01B7/196
Inventor 王刚吴孝兰吕文华贾自自
Owner SINOPHARM CHEM REAGENT
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