RECOVERY METHOD FOR DISSOLVED SALT, RECOVERY DEVICE FOR DISSOLVED SALT, AND PRODUCTION METHOD FOR CALCIUM CHLORIDE

WIPO Patent Application WO/2014/104248

A1

Provided is a recovery method for a dissolved salt in which: NaCl-containing water resulting from resource extraction is passed through a packed tower (16) that is packed with an anion exchange resin in order to recover NaHCO3; a Ca(OH)2 solution is passed through the packed tower (16) after the water resulting from resource extraction has passed therethrough; regeneration treatment is performed on the anion exchange resin within the packed tower (16); the pH of a regeneration treatment liquid used in the regeneration treatment is monitored when recovering said regeneration treatment liquid; and the recovered regeneration treatment liquid is concentrated and dried in order to recover CaCl2 until the monitored pH value reaches a preset setting value. As a result, it is possible to recover CaCl2 containing a minimum of impurities from the water resulting from resource extraction.

SHIMIZU KAZUHIKO (JP)
TOBA YUICHIRO (JP)
IMAMURA EIJI (JP)
SHIMURA MITSUNORI (JP)
SHINOHARA MASAYO (JP)
IMAHAMA TOSHINOBU (JP)
KIM HYUNAH (JP)

PCT/JP2013/084992

July 03, 2014

December 26, 2013

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CHIYODA CORP (JP)

C01D7/00; C01F11/24; C02F1/42; E21B43/00

WO2006006497A1

2006-01-19

JPH0177061C1
JPH07507032A	1995-08-03

ROBERT KUNIN: "Ion exchange in chemical synthesis", INDUSTRIAL AND ENGINEERING CHEMISTRY, vol. 56, no. 1, January 1964 (1964-01-01), pages 35 - 39

YKI Patent Attorneys (JP)
Patent business corporation YKI international patent firm (JP)

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