Patent ID: 9416222
Filing Date: 2016-08-16
CPC Classification: C08G,C12N,C12P,G01N,Y10T

Claim Text:
1. A process for separation and purification of polymerizable lactic acid from fermentation liquors, comprising: a) separating biomass and any solids from the fermentation liquor, in at least two successive stages; b) separating lactic acid solution from the biomass-free fermentation liquor by use of simulated moving bed chromatography (SMB); c) purifying the separated lactic acid solution by a first ion exchange step; d) subjecting the first-ion-exchange purified lactic acid solution to at least one of a first single or multistage partial evaporation step to obtain a lactic acid solution having less than a 100% concentration by weight of lactic acid; e) purifying the lactic acid solution further by a second ion exchange step; f) subjecting the second-ion-exchange purified lactic acid solution to at least one of a second single or multistage evaporation step.