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A kind of preparation method of hydrogen fluoride, the preparation method of hydrofluoric acid

A technology of hydrogen fluoride and hydrogen fluoride, which is applied in the field of hydrogen fluoride preparation, can solve the problems of low production efficiency of hydrogen fluoride and incomplete decomposition of hydrogen fluoride, and achieve the effects of reducing incomplete decomposition, reducing energy consumption and improving efficiency

Active Publication Date: 2020-05-12
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing hydrogen fluoride to solve the problems of incomplete decomposition of hydrogen fluoride and low production efficiency of hydrogen fluoride in the prior art

Method used

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  • A kind of preparation method of hydrogen fluoride, the preparation method of hydrofluoric acid
  • A kind of preparation method of hydrogen fluoride, the preparation method of hydrofluoric acid
  • A kind of preparation method of hydrogen fluoride, the preparation method of hydrofluoric acid

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Embodiment 1

[0038] The preparation method of hydrogen fluoride of the present embodiment, process flow sheet figure 1 , including the following steps:

[0039] 1) Take 1 ton of fluorosilicic acid solution with a mass fraction of 10%, add 0.88m 3 The saturated potassium carbonate solution (20°C, potassium carbonate solubility 111g / L) was reacted at 90°C for 40min to obtain potassium fluorosilicate product slurry, and then filtered for the first time, and the filter cake obtained by the first filtration was washed to obtain Potassium fluorosilicate ointment (contains about 152.86kg potassium fluorosilicate), add water to make 30% (mass fraction) potassium fluorosilicate slurry; the filtrate obtained from the first filtration and the filter cake obtained from the first filtration are washed The final washing solution is used to prepare saturated potassium carbonate solution;

[0040] 2) Warm up the obtained potassium fluorosilicate slurry to 40°C, then pass through 17% ammonia water to car...

Embodiment 2

[0045] The preparation method of the hydrogen fluoride of the present embodiment comprises the following steps:

[0046] 1) Take 1 ton of fluorosilicic acid solution with a mass fraction of 16%, add 1.38m 3 The saturated potassium hydroxide solution was reacted at 90°C for 40 minutes to obtain potassium fluorosilicate product slurry, and then filtered for the first time, and the filter cake obtained by the first filtration was washed to obtain potassium fluorosilicate ointment (containing fluorosilicic acid Potassium is about 244.58kg), add water and be mixed with the potassium fluorosilicate slurry of 30% (mass fraction); The filtrate that filter obtains for the first time and the washing liquid after filter cake washing that filter gained for the first time are used for preparing saturated potassium carbonate solution;

[0047] 2) Warm up the obtained potassium fluorosilicate slurry to 40°C, then pass through 17% ammonia water to carry out ammonolysis for 30 minutes, and th...

Embodiment 3

[0052] The preparation method of the hydrogen fluoride of the present embodiment comprises the following steps:

[0053] 1) Take 1 ton of fluorosilicic acid solution with a mass fraction of 40%, add 3.45m 3 The saturated potassium hydroxide solution was reacted at 90°C for 40 minutes to obtain potassium fluorosilicate product slurry, and then filtered for the first time, and the filter cake obtained by the first filtration was washed to obtain potassium fluorosilicate ointment (containing fluorosilicic acid Potassium is about 611.45kg), add water and be mixed with the potassium fluorosilicate slurry of 30% (mass fraction); The filtrate that filter obtains for the first time and the washing liquid after filter cake washing that filter gained for the first time are used for preparing saturated potassium carbonate solution;

[0054] 2) Warm up the obtained potassium fluorosilicate slurry to 40°C, then pass through 17% ammonia water to carry out ammonolysis for 30 minutes, and th...

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Abstract

The invention relates to a preparation method for hydrogen fluoride and a preparation method of hydrofluoric acid, and belongs to the technical field of preparation of hydrogen fluoride. The preparation method for hydrogen fluoride includes the following steps of: heating bifluoride solid to 150-450 DEG C so as to enable 10-40% of the bifluoride solid to be pre-decomposed and obtain paste; and then calcining the paste at 500-550 DEG C for decomposition so as to obtain fluoride and crude hydrogen fluoride gas, wherein the bifluoride is sodium bifluoride or potassium bifluoride. According to thepreparation method of hydrogen fluoride, incomplete decomposition caused by melting of the bifluoride can be reduced by heating the bifluoride solid for pre-decomposition and then performing high-temperature calcination, the rate of the decomposition reaction is accelerated, and the production efficiency is improved; meanwhile, by heating the bifluoride solid for pre-decomposition at a low temperature before high-temperature calcination, corrosion, which is caused by the hydrogen fluoride gas generated by the decomposition due to moisture or water absorption of the bifluoride solid, to equipment can be reduced when high-temperature calcination is performed.

Description

technical field [0001] The invention relates to a method for preparing hydrogen fluoride and a method for preparing hydrofluoric acid, belonging to the technical field of hydrogen fluoride preparation. Background technique [0002] Fluosilicic acid is also called hydrosilicic acid, molecular formula: H 2 SiF 6 , Molecular weight: 144.09, unstable, easily decomposed into silicon tetrafluoride and hydrogen fluoride. The anhydrous substance of fluosilicic acid is a colorless gas, and its aqueous solution is colorless, showing a strong acid reaction, corrosive, and can corrode glass, so it can be stored in containers made of wax or plastic. When the concentrated solution is cooled, colorless dihydrate crystals are precipitated, with a melting point of 19°C. Fluorosilicic acid has disinfection properties, and is often used in the production of fluorosilicate and cryolite, and is used in electroplating, beer disinfection, and wood preservation. Fluosilicic acid can be prepared...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/19
CPCC01B7/191
Inventor 侯红军刘海霞薛峰峰薛旭金于贺华王建萍马广辉卢周利耿梦湍李云峰
Owner DO FLUORIDE CHEM CO LTD
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