Preparation method of ammonium bifluoride

A technology of ammonium bifluoride and ammonium bifluoride crystals, which is applied in the direction of ammonium halide, etc., to achieve the effect of not demanding conditions, easy realization, and significant economic benefits

Active Publication Date: 2012-07-04
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Set the rotation speed of the stirrer to 120r / min, add 500g of ammonium fluoride solution with a mass percentage concentration of 10% to the polytetrafluoroethylene three-necked bottle, and pass 216.22g of hydrofluoric acid with a mass percentage concentration of 15% into the ammonium fluoride solution Solution (the addition amount of hydrofluoric acid is 120% of the theoretical amount), the addition rate of hydrofluoric acid is 30ml / min; the reaction temperature is set at 40°C, and sodium hydroxide with a mass percentage concentration of 5% is used to absorb the gas released during the reaction. hydrofluoric acid; reacted for 60min, then added 43.36g of ammonia solution with a mass percentage concentration of 12% to the reaction system (the amount of ammonia added was 110% of the theoretical amount), the rate of adding ammonia was 30ml / min, and the reaction temperature was controlled at 30 ℃, reacted for 40 minutes; the ammonium bifluoride solution was concentrated at 6...

Embodiment 2

[0016] Set the rotation speed of the stirrer to 240r / min, add 500g of ammonium fluoride solution with a mass percentage concentration of 20% to the polytetrafluoroethylene three-necked bottle, and pass 337.84g of hydrofluoric acid with a mass percentage concentration of 20% into the ammonium fluoride solution Solution (the addition amount of hydrofluoric acid is 125% of the theoretical amount), the addition rate of hydrofluoric acid is 60ml / min; the reaction temperature is set at 50°C, and sodium hydroxide with a concentration of 17% by mass is used to absorb the gas released during the reaction. hydrofluoric acid; reacted for 69 minutes; then added 94.59 g of ammonia solution with a mass percentage concentration of 15% to the reaction system (the amount of ammonia added was 120% of the theoretical amount), the rate of adding ammonia was 50ml / min, and the reaction temperature was controlled at 28 ℃, react for 50 minutes; concentrate the ammonium bifluoride solution at 65 ℃, use...

Embodiment 3

[0018] Set the rotation speed of the stirrer to 280r / min, add 500g of ammonium fluoride solution with a mass percentage concentration of 30% to the polytetrafluoroethylene three-necked bottle, and pass 351.35g of hydrofluoric acid with a mass percentage concentration of 30% into the ammonium fluoride solution Solution (the addition amount of hydrofluoric acid is 130% of the theoretical amount), the addition rate of hydrofluoric acid is 90ml / min; the reaction temperature is set at 60°C, and sodium hydroxide with a mass percentage concentration of 21% is used to absorb the gas released during the reaction. hydrofluoric acid; reacted for 73 minutes; then added 153.721 g of ammonia solution with a mass percentage concentration of 18% to the reaction system (the amount of ammonia added was 130% of the theoretical amount), the rate of adding ammonia was 60ml / min, and the reaction temperature was controlled at 26 ℃, reacted for 70 minutes; the ammonium bifluoride solution was concentr...

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Abstract

The invention discloses a preparation method of ammonium bifluoride. The preparation method comprises the following steps of: with unsaturated ammonium fluoride solution with the mass percent concentration of 10-50% adopted, adding hydrofluoric acid with the mass percent concentration of 15-50%, and controlling reaction temperature to be 40-80 DEG C; after the reaction is finished, adding ammoniasolution with the mass percent concentration of 12-25% into a reaction system, reacting with excessive hydrofluoric acid, controlling reaction temperature to be below 30 DEG C, reacting for 40-90 minutes, concentrating ammonium bifluoride solution obtained in a three-opening bottle, then cooling and crystallizing, so as to obtain ammonium bifluoride crystals; and drying the ammonium bifluoride crystals, thus an ammonium bifluoride product is obtained. The invention has the beneficial effects that: compared with the prior art, process route is simple, conditions and requirements are unharsh, and realization is easy; the prepared ammonium bifluoride product has low moisture content and high purity, the product does not cake, energy consumption problem is noticed in a production process of ammonium bifluoride, and excessive consumption of energy source is avoided. By adopting the preparation method disclosed by the invention, fluorine resource is efficiently utilized, and the fluorine resource which enters into a system is finally converted into the ammonium bifluoride product. The preparation method disclosed by the invention has obvious economic benefit and is applicable to being popularized in fluorine chemical enterprises.

Description

technical field [0001] The invention belongs to the preparation of fluoride salts in the field of chemical industry, and in particular relates to a preparation method of ammonium bifluoride. Background technique [0002] For decades, the global fluorine chemical industry has developed steadily. Fluorine chemical products are widely used in military industry, chemical industry, machinery and other fields due to their excellent properties such as chemical resistance, high and low temperature resistance, aging resistance, low friction, and high insulation. The fastest growing, most high-tech and most promising products in the chemical industry. [0003] Ammonium bifluoride is a kind of fluorine chemical product widely used in the fluorine chemical industry. It is widely used in chemical industry, metallurgy, food and other industries. High-purity ammonium bifluoride can also be applied to semiconductor industry and pharmaceutical industry. Ammonium bifluoride is a colorless or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16
Inventor 何浩明隋岩峰李子燕李天祥解田张承屏杨丽萍刘松林骆吉林曾祥明李白玉
Owner WENGFU (GRP) CO LTD
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