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Method for preparing ammonium bifluoride with high purity

A technology of ammonium bifluoride and ammonium bifluoride crystals, which is applied in the direction of ammonium halide, can solve the problems of high water content, purity less than 97%, moisture absorption and agglomeration of ammonium bifluoride, reduce decomposition and sublimation energy consumption, and ensure quality and purity Effect

Inactive Publication Date: 2010-03-17
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ammonium bifluoride prepared by the liquid phase method has a high water content and a purity of generally less than 97%. Moisture absorption and caking will occur in long-term storage, which cannot meet the needs of industries such as the electronics industry and the pharmaceutical industry with high requirements. Usually, it can only reach Industrial grade requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 500g of high-purity ammonium fluoride, decompose the high-purity ammonium fluoride at 130°C, and absorb the ammonia gas produced by the decomposition with a dilute hydrochloric acid solution with a mass concentration of 5%; the decomposed ammonium bifluoride crystals are sublimated at 222°C , collecting the ammonium bifluoride vapor to obtain a high-purity ammonium bifluoride product with a mass content of 99.1%.

Embodiment 2

[0014] Take 600g of high-purity ammonium fluoride, decompose the high-purity ammonium fluoride at 135°C, and absorb the ammonia gas produced by the decomposition with a 6% dilute hydrochloric acid solution; the decomposed ammonium bifluoride crystals are sublimated at 224°C, The ammonium bifluoride vapor is collected to obtain a high-purity ammonium bifluoride product with a mass content of 99.2%.

Embodiment 3

[0016] Take 450g of high-purity ammonium fluoride, and decompose the high-purity ammonium fluoride at 139°C, and the ammonia gas generated by the decomposition is absorbed with a dilute hydrochloric acid solution with a mass concentration of 8%; the decomposed ammonium bifluoride crystals are sublimated at 225°C, The ammonium bifluoride vapor is collected to obtain a high-purity ammonium bifluoride product with a mass content of 98.9%.

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Abstract

The invention discloses a method for preparing an ammonium bifluoride with high purity. The ammonium fluoride with high purity is taken as a raw material and is decomposed at the temperature of 130-148.5 DEG C, thus generating ammonia gas; the ammonia gas generated by decomposition is absorbed by a dilute hydrochloric acid solution with the mass concentration of 5-12%; the ammonium fluoride crystals obtained by the decomposition are sublimed under the temperature of 222-230 DEG C; and the ammonium bifluoride vapor is collected, thus obtaining the ammonium bifluoride product. The method has high yield and high product purity and can meet high requirement.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of high-purity ammonium bifluoride. Background technique [0002] Ammonium bifluoride is a type of fluorine chemical product widely used in the fluorine chemical industry. Ammonium bifluoride is a white orthorhombic or flaky crystal with a relative density of 1.5. It is easily deliquescent in the air, easily soluble in water, and slightly soluble in ethanol. Ammonium bifluoride is widely used in chemical industry, metallurgy, mechanical processing and food industries, and high-purity ammonium bifluoride can also be used in semiconductor industry and pharmaceutical industry. [0003] The production process of ammonium bifluoride can be divided into two methods: gas phase method and liquid phase method. Because the gas-phase synthesis of ammonium fluoride does not touch water during the process, the product has low water content, a purity of over 9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16
Inventor 李子燕隋岩峰解田李天祥杨丽萍刘松林骆吉林
Owner WENGFU (GRP) CO LTD
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