PROCESS FOR TREATING AN AQUEOUS KF WASTE STREAM AND FOR CONVERTING KF INTO HF AND KOH

The present invention is directed to a process for treating an aqueous KF waste stream comprising at least one treatment step selected from the group consisting of inert gas stripping the aqueous KF waste stream, passing said waste stream through a carbon bed, concentrating said waste stream or a co...

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Bibliographische Detailangaben
Hauptverfasser: SOMANAHALLI N. SUBBANNA, YUIH CHIAO, K.N. MANI, JEFF W. MCKOWN, ROBERT A. SMITH, CHARLES L. REDMON
Format: Patent
Sprache:eng ; spa
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Zusammenfassung:The present invention is directed to a process for treating an aqueous KF waste stream comprising at least one treatment step selected from the group consisting of inert gas stripping the aqueous KF waste stream, passing said waste stream through a carbon bed, concentrating said waste stream or a combination thereof to remove dissolved organic compounds. The present invention is also directed to subjecting the treated KF waste stream to electrodialytic splitting in a water splitting cell to form HF and either KOH or an acid depleted salt stream. The dilute HF can be concentrated to a concentrated and commercially viable product. La presente invencion se dirige a un proceso para tratar una corriente acuosa de desechos de KF, el cual comprende una etapa de tratamiento seleccionada del grupo que consta de la separacion de gas inerte de la corriente acuosa de desechos del KF, pasar esta corriente de desechos a través de un lecho de carbon, y concentrar la corriente de desechos, o una combinacion de ellas, para remover los compuestos orgánicos disueltos. La presente invencion también se dirige a someter la corriente de desechos de KF tratada al desdoblamiento electrodialítico en una celda de desdoblamiento del agua, para formar el HF y cualquiera del KOH o una corriente de sal agotada del ácido. El HF diluido se puede concentrar a un producto concentrado, viable comercialmente.