A method for continuously preparing hydrogen fluoride with a rotary reactor

A reaction furnace and hydrogen fluoride technology, applied in the direction of fluorine/hydrogen fluoride, etc., can solve the problem that the production capacity of the superphosphate waste gas method cannot be improved, and achieve the effect of solving the shortage of raw material supply, broadening the source of raw materials, and reducing production costs

Inactive Publication Date: 2011-11-30
西安三瑞实业有限公司
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Problems solved by technology

However, the direct utilization of phosphate rock technology is still in the development stage, and the production capacity of the

Method used

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  • A method for continuously preparing hydrogen fluoride with a rotary reactor
  • A method for continuously preparing hydrogen fluoride with a rotary reactor

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Experimental program
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Effect test

Embodiment 1

[0062] Put 100kg of NaAlF 4 And 156kg of 100% concentrated sulfuric acid is added to the temperature of 260℃, slight negative pressure 10mmH 2 O reaction in the rotary reactor. The hydrogen fluoride gas produced by the reaction is pumped out of the furnace head sulfuric acid chute, and is collected, dried and purified. The mixture of sodium sulfate and aluminum sulfate generated at the end of the furnace and the incompletely reacted NaAlF 4 A part is returned to the furnace head through the internal return mechanism, and a part is discharged from the reaction furnace. Through analysis and calculation, the conversion rate of hydrogen fluoride is 96.7%, and the purity of hydrogen fluoride reaches more than 99%.

Embodiment 2

[0064] Add 94kg of NaF and 110kg of 100% concentrated sulfuric acid to a temperature of 240℃ and a slight negative pressure of 8mmH 2 O reaction in the rotary reactor. The hydrogen fluoride gas produced by the reaction is pumped out of the furnace head sulfuric acid chute, and is collected, dried and purified. Part of the sodium sulfate and incompletely reacted NaF generated at the end of the furnace is returned to the furnace head through the internal return mechanism, and part is discharged from the reaction furnace. Through analysis and calculation, the conversion rate of hydrogen fluoride is 95.8%, and the purity of hydrogen fluoride reaches more than 99%.

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Abstract

The invention discloses a method for continuously preparing hydrogen fluoride by using a rotary reaction furnace. The method comprises the following steps of: mixing sodium aluminum fluoride and/or sodium fluoride and concentrated sulfuric acid; reacting in the rotary reaction furnace under the conditions of a temperature of 100 to 300 DEG C and micro negative pressure of 5 to 20mm H2O to obtain hydrogen fluoride gas; and returning part of non-totally reacted materials to a furnace end through an inner material return mechanism, so that the returned materials and an added raw material form a certain solid-to-liquid ratio, and keeping reacting in the rotary reaction furnace. Compared with the prior art, the method has the advantages that: a large quantity of non-renewable resources, such as fluorite, can be avoided, so the production cost can be reduced; a by-product NaAlF4 produced during polysilicon production by a silanization method and a by-product such as NaF produced during silicon tetrafluoride production by thermally cracking sodium fluosilicate can be used effectively, so the resources can be recycled and reused; meanwhile, the raw material conversion rate is increased and problems of corrosion and scabbing of a furnace body during reaction can be solved.

Description

Technical field [0001] The invention relates to a method for continuously preparing hydrogen fluoride by using a rotary reaction furnace-the by-product sodium aluminum fluoride or sodium fluorosilicate produced in the process of preparing polycrystalline silicon by the silane method is thermally cracked to produce silicon tetrafluoride by-product sodium fluoride to prepare hydrogen fluoride Industrialized production methods. Background technique [0002] Hydrogen fluoride is a basic fluorinated chemical product and a raw material for the production of fluorine refrigerants, fluorine-containing resins, organic fluorides, inorganic fluorides, fluorine rubber, fluorine-containing intermediates and fine chemicals. In the petrochemical industry, it is used as a liquid catalyst for the alkylation of aromatic hydrocarbons and aliphatic compounds to produce high-octane gasoline. When mining certain deposits, hydrogen fluoride is used to corrode the stratum, and it can also be used for t...

Claims

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Application Information

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IPC IPC(8): C01B7/19
Inventor 何建祥魏超王思远
Owner 西安三瑞实业有限公司
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