A method and a plant for purifying lactic acid
AssigneeSulzer Management AG
InventorsClaudia VON SCALA, Simonetta RIMA, Peter FAESSLER, Christian BACHMANN
Life of this patent
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Abstract
A method for purifying a crude aqueous lactic acid composition, the method includes heating and pressurizing the crude aqueous lactic acid composition so as to obtain a liquid, heated and pressurized crude aqueous lactic acid composition, flash evaporating the liquid, heated and pressurized crude aqueous lactic acid composition obtained so as to obtain crude lactic acid vapor, and gradually condensing the crude lactic acid vapor by leading the crude lactic acid vapor through at least three successive condensers so as to obtain at least three condensed streams, one stream of the at least three condensed streams being a purified lactic acid stream.
Claims20
A method for purifying a crude aqueous lactic acid composition, the method comprising:
- heating and pressurizing the crude aqueous lactic acid composition so as to obtain a liquid, heated and pressurized crude aqueous lactic acid composition;
- flash evaporating the liquid, heated and pressurized crude aqueous lactic acid composition obtained so as to obtain crude lactic acid vapor;
- and
- gradually condensing the crude lactic acid vapor by leading the crude lactic acid vapor through at least three successive condensers so as to obtain at least three condensed streams, one which stream of the at least three condensed streams being a purified lactic acid stream.
A plant for purifying a crude aqueous lactic acid composition, comprising:
- a device configured to heat and pressurize a crude aqueous lactic acid composition to a liquid, heated and pressurized crude aqueous lactic acid composition;
- a flash evaporation device configured to flash evaporate the liquid, heated and pressurized crude aqueous lactic acid composition;
- and
- at least three successive condensers configured to gradually condense the crude lactic acid vapor obtained in the flash evaporation device.
Dependencies are inferred from the claim text.