Method for producing high-purity ammonium bifluoride

A technology of ammonium bifluoride and production method, which is applied in the direction of ammonium halide, etc., can solve the problems of high water content, inability to store for a long time, and slow dissolution rate of ammonium bifluoride, and achieve significant economic benefits, fast dissolution rate, and not easy to agglomerate

Active Publication Date: 2010-12-01
焦作市增氟科技有限公司
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above preparation methods, the liquid phase method has less investment and simple process, but the ammonium bifluoride produced has high water content, low purity, slow product dissolution rate, inconvenient use, easy caking, and cannot be stored for a lo

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production method of high-purity ammonium bifluoride comprises the following steps:

[0016] (1) Prepare 500g of ammonium fluoride into a saturated solution of ammonium fluoride, add it into the reactor, start stirring, and pass anhydrous hydrogen fluoride into the saturated solution of ammonium fluoride. The ventilation rate of anhydrous hydrogen fluoride is 14mol / h. During the process of hydrogen fluoride in water, monitor the reaction liquid with Congo red test paper, stop passing anhydrous hydrogen fluoride when the Congo red test paper just turns brown, and control the temperature of the reaction process to about 30°C;

[0017] (2) Cool to 5°C and keep for 3 hours, crystals will precipitate out;

[0018] (3) Filtrate, and return the filtrate to step (1) prepare a saturated solution of ammonium fluoride, and dry the filter cake at 40° C. to obtain the product high-purity ammonium bifluoride.

Embodiment 2

[0020] The production method of high-purity ammonium bifluoride comprises the following steps:

[0021] (1) Prepare 500g of ammonium fluoride into a saturated solution of ammonium fluoride, add it into the reactor, start stirring, and pass anhydrous hydrogen fluoride into the saturated solution of ammonium fluoride. The ventilation rate of anhydrous hydrogen fluoride is 7mol / h. During the process of hydrogen fluoride in water, monitor the reaction solution with Congo red test paper, stop passing anhydrous hydrogen fluoride when the Congo red test paper just turns brown, and control the temperature of the reaction process to about 40°C;

[0022] (2) Cool to 10°C and keep for 4 hours, crystals will precipitate out;

[0023] (3) Filtration, and the filtrate is returned to step (1) to prepare a saturated solution of ammonium fluoride, and the filter cake is air-dried at 80°C to obtain the product high-purity ammonium bifluoride.

Embodiment 3

[0025] The production method of high-purity ammonium bifluoride comprises the following steps:

[0026] (1) Prepare 500g of ammonium fluoride into a saturated ammonium fluoride solution, add it into the reactor, start stirring, and pass anhydrous hydrogen fluoride into the saturated ammonium fluoride solution. The ventilation rate of anhydrous hydrogen fluoride is 10mol / h. During the process of hydrogen fluoride in water, monitor the reaction solution with Congo red test paper. When the Congo red test paper just turns brown, stop passing anhydrous hydrogen fluoride, and control the temperature of the reaction process to about 50°C;

[0027] (2) Cool to 20°C and keep for 2 hours, crystals will precipitate out;

[0028] (3) Filtrate, and return the filtrate to step (1) prepare a saturated solution of ammonium fluoride, and dry the filter cake at 60° C. to obtain the high-purity ammonium bifluoride product.

[0029] The ammonium fluoride used in Example 1, Example 2, and Example...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for producing high-purity ammonium bifluoride, which comprises the following steps of: (1) under the stirring condition, introducing anhydrous hydrogen fluoride into saturated solution of ammonium fluoride until the pH value of the reaction liquid ranges from 1 to 4, and stopping introducing the anhydrous hydrogen fluoride, wherein the temperature is controlled between 25 and 50 DEG C in the reaction process; (2) cooling the reaction liquid to the temperature of between 5 and 20 DEG C, and keeping the temperature for 2 to 4 hours until crystals separate out; and (3) filtering, drying a filter cake to obtain the product of high-purity ammonium bifluoride, and recycling the filter liquor. The method for producing the high-purity ammonium bifluoride has the advantages of small equipment investment, simple process, easy operation, and low moisture content, high purity, high dissolving speed, convenient use, hard agglomeration, and long-term storage of the product ammonium bifluoride. The mother solution is circulated in a closed loop, and the whole technical process has no liquid waste discharge. The raw material ammonium fluoride is prepared by ammonolysis of a byproduct fluosilicic acid in the phosphate fertilizer industry, and the method has the advantages of easily obtained raw materials, low cost, and low production cost. The method provides a new fluoride source, and solves the problem of environmental pollution in the phosphate fertilizer industry.

Description

technical field [0001] The invention relates to a production method of ammonium bifluoride, in particular to a production method of high-purity ammonium bifluoride. Background technique [0002] Ammonium bifluoride can be used as a chemical reagent, glass etchant, disinfectant and antiseptic in fermentation industry, solvent for metal beryllium made of beryllium oxide, and surface treatment agent for silicon steel plates. It is also used in the manufacture of ceramics, magnesium alloys, boiler feed water systems and steam It can be used for cleaning and descaling of generation system, as well as acid treatment of sandstone in oil field, and also used as catalyst component of alkylation and isomerization, etc. [0003] The traditional production methods of ammonium bifluoride mainly include liquid phase method and gas phase method, both of which use hydrofluoric acid and ammonia as raw materials. The liquid-phase method is obtained by vaporizing liquid ammonia and passing it...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01C1/16
Inventor 陈大红李云峰陈娟薛峰峰孙永明马成林杨水艳
Owner 焦作市增氟科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap