A method for producing anhydrous hydrogen fluoride and silicon tetrafluoride by utilizing fluosilicic acid

An anhydrous hydrogen fluoride, silicon tetrafluoride technology, applied in the direction of fluorine/hydrogen fluoride, halogenated silicon compounds, halogenated silanes, etc., can solve the problems of not being effectively and reasonably used, and achieve significant environmental protection benefits, low cost of raw materials, Outstanding economic benefits

Inactive Publication Date: 2011-12-14
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the market application of fluosilicic acid, a by-product of phosphate fertilizer production, is limited to the production of cryolite and aluminum fluoride, and has not been effectively and rationally utilized.

Method used

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  • A method for producing anhydrous hydrogen fluoride and silicon tetrafluoride by utilizing fluosilicic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment produces the method for anhydrous hydrogen fluoride and silicon tetrafluoride, and concrete steps are:

[0023] (1) Take 1000kg of fluosilicic acid solution with a mass percentage concentration of 40% of the by-product of phosphate fertilizer production and react with 400kg of sodium sulfate at room temperature to form sodium fluosilicate and dilute sulfuric acid solution, then filter, and the obtained filtrate is dilute sulfuric acid solution , the mass percentage concentration of this dilute sulfuric acid solution is 31%, and the dilute sulfuric acid solution is concentrated and made into the concentrated sulfuric acid with a mass percentage concentration of 80% through steel-lined tetrafluoro heating equipment, and the gained filter cake is sodium fluorosilicate ointment, totally 523kg;

[0024] (2) Mix the sodium fluorosilicate ointment in step (1) with concentrated concentrated sulfuric acid at a molar ratio of 1:1, then add it to the pre-reac...

Embodiment 2

[0027] The present embodiment produces the method for anhydrous hydrogen fluoride and silicon tetrafluoride, and concrete steps are:

[0028] (1) Take 1000kg of fluorosilicic acid solution with a mass percentage concentration of 20% of anhydrous hydrogen fluoride industrial by-product and react with 200kg of sodium sulfate at room temperature to generate sodium fluorosilicate and dilute sulfuric acid solution, then filter, and the obtained filtrate is dilute Sulfuric acid solution, the mass percentage concentration of this dilute sulfuric acid solution is 15%, and dilute sulfuric acid solution is concentrated and made the concentrated sulfuric acid that mass percentage concentration is 90% through PFA heating equipment, and gained filter cake is sodium fluosilicate ointment, totally 262kg;

[0029] (2) Mix the sodium fluorosilicate ointment in step (1) with concentrated concentrated sulfuric acid at a molar ratio of 1:1, then add it to the pre-reactor and react at 150°C to prod...

Embodiment 3

[0032] The present embodiment produces the method for anhydrous hydrogen fluoride and silicon tetrafluoride, and concrete steps are:

[0033](1) Take 1000kg of fluorosilicic acid solution with a mass percentage concentration of 10% of anhydrous hydrogen fluoride industrial by-product and react with 100kg of sodium sulfate at room temperature to form sodium fluorosilicate and dilute sulfuric acid solution, and then filter to obtain the filtrate as dilute Sulfuric acid solution, the mass percent concentration of this dilute sulfuric acid solution is 7.5%, and the dilute sulfuric acid solution is concentrated through PFA heating equipment to make the concentrated sulfuric acid that the mass percent concentration is 80%, and the gained filter cake is sodium fluorosilicate ointment, altogether 130kg;

[0034] (2) Mix the sodium fluorosilicate ointment in step (1) with concentrated concentrated sulfuric acid at a molar ratio of 1:1.5, then add it to the pre-reactor and react at 150°C...

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Abstract

The invention discloses a method for producing anhydrous hydrogen fluoride and silicon tetrafluoride by utilizing fluosilicic acid. The method of the invention is specifically to firstly react fluosilicic acid solution with sodium sulfate at normal temperature to obtain sodium fluosilicate and dilute sulfuric acid. Filtration, dilute sulfuric acid is concentrated to make concentrated sulfuric acid, then mixed with filter cake sodium fluorosilicate ointment, added to the pre-reactor, reacted at 50-200 ° C to generate silicon tetrafluoride gas, and the silicon tetrafluoride gas passes through the degassing tower Silicon tetrafluoride products are obtained after treatment; the remaining materials in the pre-reactor are transported to the rotary furnace, and then hydrogen fluoride gas is released in the rotary furnace at 150-350 °C, and the hydrogen fluoride gas is purified to produce anhydrous hydrogen fluoride products. The remaining slag in the rotary kiln is discharged through the furnace tail. The fluosilicic acid solution used in the present invention is derived from the by-products of phosphate fertilizer or anhydrous hydrogen fluoride, the cost of raw materials is low, a new source of fluorine is opened up, and the obtained anhydrous hydrogen fluoride and silicon tetrafluoride products have wide application fields and outstanding economic benefits , high value-added products.

Description

technical field [0001] The invention relates to the technical field of fluorine chemical industry, in particular to a method for producing anhydrous hydrogen fluoride and silicon tetrafluoride by using fluorosilicic acid. Background technique [0002] Fluorine chemical industry occupies an important position in the national economy and is listed as a special plan in the "Twelfth Five-Year Plan". Fluorine chemical products are widely used in military industry, aerospace, chemical industry, metallurgy, machinery, ceramics, medicine and other fields. Fluorine chemical industry has become one of the fastest growing, most high-tech and most promising industries in the chemical industry. Fluorine chemical industry is known as For the 21st century "gold" industry. [0003] At present, anhydrous hydrofluoric acid, one of the important raw materials for fluorine chemical production, mainly comes from strategic resource fluorspar. The basic reserves of fluorspar in the world are abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/19C01B33/107
Inventor 李世江侯红军杨华春于贺华薛旭金陈宏伟刘海霞王建萍张永明尚钟声
Owner DO FLUORIDE CHEM CO LTD
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