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

• Main Author: SASAYAMA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 05.09.2016
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

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 【課題】種々の工程から排出されるフッ化カルシウムから、フッ化水素を効率よく回収することのできるフッ化水素の分離回収方法およびフッ化水素の分離回収装置を提供する。【解決手段】本発明の分離回収方法は、密閉式の縦型反応容器Ｒ内にフッ化カルシウム系の原料（回収フッ化カルシウム）を充填し、これに硫酸等を添加しながら撹拌手段２の撹拌羽根２ａで上下に撹拌して、フッ素成分をフッ化水素系ガスとして分離するガス分離工程と、回収貯槽Ｔに貯留された水系の吸収液をポンプＰを用いてエゼクタＥに循環させ、エゼクタＥに負圧を発生させる工程と、上記負圧を利用して、縦型反応容器Ｒ内で発生したフッ化水素系ガスを吸い出し、このガスを回収貯槽Ｔに回収するガス回収工程と、上記水系吸収液の循環と発生するフッ化水素系ガスの回収とをバッチ単位で繰り返し行うフッ化水素濃縮工程と、を備える。【選択図】図１