METHOD OF PRODUCTION OF HYDROFLUORIC ACID AND SILICON DIOXIDE

METHOD OF PRODUCTION OF HYDROFLUORIC ACID AND SILICON DIOXIDE

methods of production of hydrofluoric acid and silicon dioxide; processing of industrial gases containing silicon tetrachloride and hydrogen fluoride. SUBSTANCE: gas to be processed is subjected to plasma chemical hydrolysis in flow of vapor-and-water plasma; gas delivered to hydrolysis stage has te...

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Hauptverfasser: KOBZAR' JU.F, STOLBOV V.P, MAKASEEV A.JU, KHOKHLOV V.A, TOMASH JU.JA, LAZARCHUK V.V, KUZ'MINYKH S.A, KRUPIN A.G
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Sprache:eng ; rus
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CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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creator KOBZAR' JU.F
STOLBOV V.P
MAKASEEV A.JU
KHOKHLOV V.A
TOMASH JU.JA
LAZARCHUK V.V
KUZ'MINYKH S.A
KRUPIN A.G
description methods of production of hydrofluoric acid and silicon dioxide; processing of industrial gases containing silicon tetrachloride and hydrogen fluoride. SUBSTANCE: gas to be processed is subjected to plasma chemical hydrolysis in flow of vapor-and-water plasma; gas delivered to hydrolysis stage has temperature below dew point of hydrogen fluoride contained in it; hydrolysis is performed at temperature of 2000 to 2500 K; hydrolysis products are subjected to hardening at rate of 103-104 K/s, silicon dioxide is separated and hydrofluoric acid is condensed. Starting flow of vapor-and-water plasma before mixing with gas to be processed has average mass temperature of 2600- 3000 K. Hydrofluoric acid thus produced contains up to 50 mas. % of HF; it is free from admixtures of nitric acid; silicon dioxide is just ultra-dispersed powder at amorphous structure of tridynamite and bulk density of 0.05-0.07 g/cu.cm. EFFECT: enhanced efficiency. 2 cl, 2 tbl
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subjects CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
title METHOD OF PRODUCTION OF HYDROFLUORIC ACID AND SILICON DIOXIDE
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