METHOD FOR PRODUCING HIGH PURITY CAUSTIC POTASH

Title:

METHOD FOR PRODUCING HIGH PURITY CAUSTIC POTASH

Document Type and Number:

WIPO Patent Application WO/2007/018203

Kind Code:

A1

Abstract:

Disclosed is a method for producing a high-purity caustic potash with a comparatively simple process, which satisfies recent demands for caustic potash of higher purity. Specifically disclosed is a method for producing a high-purity caustic potash wherein an aqueous caustic potash solution containing not more than 200 mg/kg of sodium and 15 mg/kg of chlorine in terms of potassium chloride when the caustic potash concentration is 48% is kept at a high temperature, thereby obtaining a high-purity caustic potash hardly containing impurities such as sodium, chlorine, and heavy metals such as iron, chromium and nickel by crystallization.

Inventors:

OSAKABE TSUGIYOSHI (JP)
IMAYOSHI SEI (JP)
HAMAMORI MITSUHARU (JP)

Application Number:

PCT/JP2006/315638

Publication Date:

February 15, 2007

Filing Date:

August 08, 2006

Export Citation:

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Assignee:

TOAGOSEI CO LTD (JP)
OSAKABE TSUGIYOSHI (JP)
IMAYOSHI SEI (JP)
HAMAMORI MITSUHARU (JP)

International Classes:

C01D1/30; B01D9/02

Foreign References:

JPH01246124A	1989-10-02
JPS62100409A	1987-05-09
JP2000203828A	2000-07-25
JP2005001955A	2005-01-06

Other References: