SEPARATION AND RECOVERY METHOD OF HYDROGEN FLUORIDE AND SEPARATION AND RECOVERY APPARATUS OF HYDROGEN FLUORIDE

Japanese Patent JP2016160153

A

PROBLEM TO BE SOLVED: To provide a separation and recovery method of hydrogen fluoride and a separation and recovery apparatus of hydrogen fluoride, with which hydrogen fluoride is efficiently recovered from calcium fluoride discharged from various steps.SOLUTION: A separation and recovery method includes: a gas separation step to separate fluorine ingredients as a hydrogen fluoride-based gas by filling a closed type vertical reactor R with a calcium fluoride-based raw material (recovered calcium fluoride) and vertically stirring the raw material with a stirring blade 2a of stirring means 2 while adding sulfuric acid etc. thereto; a step to make an ejector E generate negative pressure by circulating an aqueous absorbent stored in a recovery storage tank T through the ejector E by using a pump P; a gas recovery step to suck out the hydrogen fluoride-based gas generated in the vertical reactor R by using the negative pressure and to recover and feed the gas into the recovery storage tank T; and a hydrogen fluoride concentration step to repeat circulation of the aqueous absorbent and recovery of the generated hydrogen fluoride-based gas in batches.SELECTED DRAWING: Figure 1

SASAYAMA KOJI

JP2015042070A

September 05, 2016

March 04, 2015

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SASAYAMA KOJI

C01B7/19

JPS473164B1
JP2011519335A	2011-07-07
JPS62132704A	1987-06-16
JP2002148857A	2002-05-22
JP2773882B2	1998-07-09
JP4371443B2	2009-11-25

Masahiko Nishito
Iisaki Aika
Yuko Saito

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