Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for preparing hydrogen fluoride by taking silicon tetrafluoride as raw material through centrifugal separation

A centrifugal separation, silicon tetrafluoride technology, applied in fluorine/hydrogen fluoride, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of difficult to collect by-product silica, uneconomical industrialization, incomplete conversion, etc. Easy to promote and implement industrialization, reduce energy consumption, and improve the effect of conversion rate

Active Publication Date: 2022-07-12
GUIZHOU RES INST OF CHEM IND
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the recycling and efficient utilization of fluorine resources in phosphate rock has become the key direction of the development of the fluoride salt industry, enabling the development and utilization of fluorine resources in the development process of the phosphorus chemical industry. For example: Patent No. 201110192918.7 disclosed In view of the current development status of phosphate rock fluorine resources, industrial production and research results at home and abroad all use fluosilicic acid or fluorosilicate by-product of phosphorite rock as a raw material to produce hydrogen fluoride, but this process has the following disadvantages in general: ① Transformation Incomplete, low main content; ②Equipment corrosion problem has not been fundamentally resolved; ③High energy consumption, uneconomical industrialization; ④By-product white carbon black is difficult to collect or filter; ⑤The production process is prone to secondary pollution
[0004] It can be seen that the production of hydrogen fluoride by silicon tetrafluoride as a raw material in the prior art has been extensively studied, and all of them can make the purity of anhydrous hydrogen fluoride reach more than 99.9%, greatly improving the quality of hydrogen fluoride products, but, In the prior art, in the hydrolysis process, silicon tetrafluoride needs to be hydrolyzed by contacting with water vapor, so that the temperature during the hydrolysis treatment reaches above 100°C, resulting in high energy consumption, and the separation of fluorine and silicon in silicon tetrafluoride to prepare hydrogen fluoride The cost is still high

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for preparing hydrogen fluoride by taking silicon tetrafluoride as raw material through centrifugal separation
  • Method and device for preparing hydrogen fluoride by taking silicon tetrafluoride as raw material through centrifugal separation
  • Method and device for preparing hydrogen fluoride by taking silicon tetrafluoride as raw material through centrifugal separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]The normal temperature water is stored in the liquid tank 1, the silicon tetrafluoride gas is stored in the gas storage tank 12, and the valve between the liquid tank 1 and the hydrolysis tower 2 is opened, so that the normal temperature water in the liquid tank 1 can enter the hydrolysis. In the tower 2, and shower downward from the top of the hydrolysis tower 2, the valve between the gas storage tank 12 and the hydrolysis tower 2 is opened, so that the silicon tetrafluoride gas in the gas storage tank 12 can be from the side of the hydrolysis tower 2 close to the bottom The wall enters, so that when silicon tetrafluoride escapes from the top of the bottom of the hydrolysis tower 2, it contacts the water rinsed from the top of the hydrolysis tower 2, realizes that the silicon tetrafluoride is dissolved in water after contacting with water, and hydrolysis occurs to generate a fluorosilicic acid solution mixed slurry with silica solid; then the mixed slurry is discharged f...

Embodiment 2

[0054] On the basis of Example 1, the liquid slurry discharged from the hydrolysis tower 2 is directly aged for 10 minutes and then filtered (400 mesh filter screen) in the environment of temperature ≤ 10 ° C instead of the separation component 3 for centrifugal separation. , and then the filtrate is sent to the decomposition tower 4 for decomposition, and other follow-up treatments are carried out according to Example 1. It has been tested that the conversion rate of fluorine into hydrogen fluoride in silicon tetrafluoride is about 89.1%, and the purity of the obtained anhydrous hydrogen fluoride is about 99.82%.

Embodiment 3

[0056] On the basis of Example 1, the temperature during centrifugation in the separation module 3 was controlled to be normal temperature, and other operations were performed in accordance with the operation steps of Example 1. After testing, the conversion rate of fluorine into hydrogen fluoride in silicon tetrafluoride is about 56.1%, and the purity of hydrogen fluoride is about 99.90%.

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 relates to the technical field of fluorine-silicon separation, in particular to a method and a device for preparing hydrogen fluoride through centrifugal separation by taking silicon tetrafluoride as a raw material. Silicon tetrafluoride gas and water are contacted at normal temperature and hydrolyzed to generate a fluosilicic acid solution and silicon dioxide; the conversion rate of converting the silicon tetrafluoride gas into the fluosilicic acid solution is improved, and the conversion rate of the silicon tetrafluoride is greatly improved; by utilizing the characteristic that fluosilicic acid is unstable and easy to decompose into silicon tetrafluoride gas and hydrogen fluoride gas and the characteristic that hydrogen fluoride and silicon tetrafluoride are different in boiling point, the anhydrous hydrogen fluoride is prepared by adopting concentrated sulfuric acid washing and thermal decomposition, so that the energy consumption is relatively low, the purity of the obtained product is relatively high, and the fluorine conversion rate is over 93.4 percent and is extremely high; the production cost of hydrogen fluoride is reduced to a great extent.

Description

technical field [0001] The invention relates to the technical field of separation of fluorine and silicon, in particular to a method and a device for preparing hydrogen fluoride by centrifugal separation of silicon tetrafluoride as a raw material. Background technique [0002] At present, the recycling and efficient utilization of fluorine resources in phosphate rock has become the key direction of the development of the fluoride salt industry, which enables the development and utilization of fluorine resources in the process of the development of the phosphorus chemical industry. For example: Patent No. 201110192918.7 Based on the current development status of fluorine resources in phosphate rock, the industrial production and research results at home and abroad are all using fluorosilicic acid or fluorosilicate by-product of phosphate rock as raw material to produce hydrogen fluoride, but this process has the following shortcomings: ① Conversion Incomplete, the main conten...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/19
CPCC01B7/193Y02P20/10
Inventor 陈文兴周昌平王瑶彭星运陈思帆田娟
Owner GUIZHOU RES INST OF CHEM IND