METHOD FOR PRODUCING LACTIC ACID

PROBLEM TO BE SOLVED: To purify a crude lactic acid by a new method that minimizes consumption of electrical energy or the quantity of chemicals, while dispensing with wastewater treatment. SOLUTION: A crude lactic acid is adjusted to a pH of 3 or lower and is subjected to reverse osmosis treatment...

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Bibliographic Details
Main Authors TOTO MASANORI, TAKAHASHI KOJI, ISHIGURO JIRO
Format Patent
LanguageEnglish
Published 26.06.2008
Subjects
BEER
BIOCHEMISTRY
CHEMISTRY
ENZYMOLOGY
FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE
METALLURGY
MICROBIOLOGY
MUTATION OR GENETIC ENGINEERING
SPIRITS
VINEGAR
WINE
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Summary:PROBLEM TO BE SOLVED: To purify a crude lactic acid by a new method that minimizes consumption of electrical energy or the quantity of chemicals, while dispensing with wastewater treatment. SOLUTION: A crude lactic acid is adjusted to a pH of 3 or lower and is subjected to reverse osmosis treatment by a membrane 1, to make the sugars transferred to a concentrated side C1 and then separated and removed, and this permeated liquid P1 is adjusted to a pH of 8-10 and is subjected to reverse osmosis treatment by a membrane 2, to obtain a permeated liquid P2, comprising mainly of low-concentration ammonia water and a concentrated liquid C2 constituted mainly of ammonium lactate. Ammonia is removed from this concentrated liquid C2, to obtain purified lactic acid. A crosslinked polyamide composite membrane is, preferably, used as the membranes 1, 2. COPYRIGHT: (C)2008,JPO&INPIT
Bibliography:Application Number: JP20060330630