METHOD FOR PRODUCING PURIFIED LACTIC ACID SOLUTION

WIPO Patent Application WO/2012/081112

A1

The invention is capable of concentrating calcium lactate in a solution containing lactic acid obtained by fermentation in the form of calcium lactate at low cost and reduces the thermal degradation of impurities and the optical isomerization of lactic acid. A calcium lactate-containing solution containing lactic acid obtained by fermentation in the form of calcium lactate is subjected to concentration and purification by a method comprising (1) a step of concentrating calcium lactate by removing water contained in the calcium lactate-containing solution from the solution with a reverse osmotic membrane, (2) a step of separating calcium as calcium sulfate by adding sulfuric acid to the thus obtained concentrated liquid of calcium lactate after the step of concentration with a reverse osmotic membrane, and (3) a step of removing soluble impurities by ion exchange after the step of separation of calcium sulfate.

OKA KENICHIRO (JP)
MATSUO TOSHIAKI (JP)
KAMIKAWA MASAYUKI (JP)
OKAMOTO NARUYASU (JP)
KONDO TAKEYUKI (JP)
SUZUKI KAZUTAKA (JP)

PCT/JP2010/072694

June 21, 2012

December 16, 2010

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HITACHI PLANT TECHNOLOGIES LTD (JP)
OKA KENICHIRO (JP)
MATSUO TOSHIAKI (JP)
KAMIKAWA MASAYUKI (JP)
OKAMOTO NARUYASU (JP)
KONDO TAKEYUKI (JP)
SUZUKI KAZUTAKA (JP)

C12P7/56; C07C51/42

JP2003511360A	2003-03-25
US5766439A	1998-06-16
JP2001506274A	2001-05-15
JP2007124931A	2007-05-24

LIEW M.K.H.: "Separation and purification of lactic acid: fundamental studies on the reverse osmosis down-stream process.", REPORTS OF THE HOKKAIDO NATIONAL INDUSTRIAL RESEARCH INSTITUTE, 1997, pages 32 - 40

HIRAKI YUSUKE (JP)
Yusuke Hiraki (JP)

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