ALKALI METAL SALT MANUFACTURING METHOD

Title:

ALKALI METAL SALT MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2020/137974

Kind Code:

A1

Abstract:

The present invention relates to an alkali metal salt manufacturing method that is characterized by including: a pretreatment step in which a refining-inhibiting substance is removed from an aqueous solution of an alkali metal salt, using a separation membrane that has a glucose removal rate and an isopropyl alcohol removal rate simultaneously satisfying expressions (1) and (2) below when a 1000ppm aqueous solution of glucose with a temperature of 25°C and a pH of 6.5 and a 1000ppm aqueous solution of isopropyl alcohol with a temperature of 25°C and a pH of 6.5 have respectively been made to pass therethrough using an operating pressure of 0.75MPa; and a recovery step in which the alkali metal salt is recovered from the aqueous solution of the alkali metal salt after the pretreatment step. (1): 90% > glucose removal rate ≥ 50%. (2): glucose removal rate - isopropyl alcohol removal rate ≥ 50%.

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Inventors:

MINEHARA HIROKI (JP)
KOIWA MASAKAZU (JP)

Application Number:

PCT/JP2019/050365

Publication Date:

July 02, 2020

Filing Date:

December 23, 2019

Export Citation:

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Assignee:

TORAY INDUSTRIES (JP)

International Classes:

B01D61/02; B01D69/02; C01D3/14; C01D5/16; C01F5/30; C01F11/32; C02F1/44; C22B3/22; C22B26/10; C22B26/12

Domestic Patent References:

WO2012074074A1	2012-06-07
WO2013005694A1	2013-01-10
WO2012074074A1	2012-06-07

Foreign References:

JP2018535309A	2018-11-29
CN104310446A	2015-01-28
JPS4414216B
JPH0411928B2	1992-03-03
JPH11226366A	1999-08-24
JP2018242779A	2018-12-26

Other References: