Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Reexamination Certificate
2011-08-02
2011-08-02
Manoharan, Virginia (Department: 1771)
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
C159S047300, C203S019000, C203S043000, C203S063000, C210S634000, C423S594150, C423S641000
Reexamination Certificate
active
07988831
ABSTRACT:
A method for purifying an aqueous potassium hydroxide solution having rich silicon impurities has been disclosed in the invention, which is particularly related to a method that utilizes a low-carbon alcohol (such as ethanol) for extracting said aqueous potassium hydroxide solution, and includes the steps of mixing a low-carbon alcohol with an aqueous potassium hydroxide solution having rich silicon impurities; allowing the resulting mixture therefrom to divide into an aqueous phase layer and a low-carbon alcohol phase layer that contains the aqueous potassium hydroxide solution with reduced silicon impurities, and subjecting the low-carbon alcohol phase layer to a separation process for removing the low-carbon alcohol, thereby resulting in an aqueous potassium hydroxide solution having reduced silicon impurities.
REFERENCES:
patent: 3720626 (1973-03-01), Benzaria et al.
patent: 5766565 (1998-06-01), Cronin et al.
patent: 6747065 (2004-06-01), Paszkowski
Hsu Sage
Hsu Yung Hsiung
Bacon & Thomas PLLC
Manoharan Virginia
Yeou Fa Chemical Co., Ltd.
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