Concentrating evaporators – Spray type
Reexamination Certificate
2007-12-25
2007-12-25
Drodge, Joseph (Department: 1723)
Concentrating evaporators
Spray type
C159S047100, C210S180000, C210S182000, C210S195100, C210S202000, C210S205000, C210S259000, C210S634000, C210S669000, C210S749000, C210S774000, C210S805000, C210S806000, C423S488000
Reexamination Certificate
active
10722990
ABSTRACT:
The invention provides a hydrofluoric acid wastewater treatment method that achieves efficient recovery of hydrofluoric acid from hydrofluoric acid wastewater and also achieves sufficient reduction in the hydrofluoric acid concentration of the dehydrofluorinated water after treatment.The hydrofluoric acid wastewater treatment method comprises the following steps:a hydrofluoric acid concentration step (S1) comprising concentrating hydrofluoric acid wastewater by evaporation to produce a concentrated hydrofluoric acid water and a hydrofluoric acid-containing vapor;a dissolution step (S2) comprising bringing the hydrofluoric acid-containing vapor obtained in the hydrofluoric acid concentration step (S1) into contact with dissolution water to dissolve the vapor;a neutralization step (S3) comprising bringing the residual hydrofluoric acid-containing vapor left from the dissolution step (S2) into contact with an alkali to produce a neutralized liquid and a dehydrofluorinated vapor; anda condensation step (S4) comprising condensing the dehydrofluorinated vapor obtained in the neutralization step (S3) to produce condensed water.
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Harada Koji
Maeda Mitsuo
Mizutani Junji
Mukaida Tamito
Muratani Toshiaki
Drodge Joseph
Sasakura Engineering Co. Ltd.
Sharp Kabushiki Kaisha
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