C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 7/07 (2006.01) B01D 3/00 (2006.01) C01B 7/04 (2006.01)
Patent
CA 2325325
The present invention provides a method for efficiently separating hydrogen chloride and water without adding a third component from an aqueous hydrogen chloride solution of which separation into components is difficult due to formation of an azeotropic mixture, which comprises the steps of: providing a hydrogen chloride distillation column and a dehydration column; operating the distillation column under a pressure higher than a pressure of the dehydration column; feeding and distilling an aqueous hydrogen chloride solution having a composition richer in hydrogen chloride than an azeotropic composition under the pressure of the distillation column to the distillation column; recovering hydrogen chloride from the top of the distillation column; feeding and distilling an aqueous hydrogen chloride solution having a composition richer in water than an azeotropic composition under the pressure of the dehydration column to the dehydration column; recovering water from the top of the dehydration column; feeding a part or all of the bottom liquid of the distillation column to the dehydration column; and feeding a part or all of the bottom liquid of the dehydration column to the distillation column.
Iwanaga Kiyoshi
Suzuta Tetsuya
Fetherstonhaugh & Co.
Sumitomo Chemical Co. Ltd.
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