Patent ID: 8287652
Filing Date: 2012-10-16
Classification: B01D,C13B,C13K

Abstract:
1. A process of recovering xylose by nanofiltration from a solution of plant-based biomass hydrolysate containing xylose, comprising subjecting the solution to nanofiltration to obtain a nanofiltration retentate and a nanofiltration permeate, and recovering the nanofiltration permeate comprising a solution enriched in xylose, further comprising regulating xylose flux in the nanofiltration permeate to a range of 0.2 to 3 kg xylose/(m by adjusting dry substance content (DS) of the solution of the plant-based biomass hydrolysate used as a nanofiltration feed to a range of 25-35% by weight and the xylose content of the nanofiltration feed to a range of 35-50% on DS, and by further adjusting the nanofiltration temperature to the range of 55-70° C. and the nanofiltration pressure to the range of 30-40 bar, and recovering a nanofiltration permeate having a dry substance content of 5 to 40% by weight and a xylose content of 35 to 85% on DS, to provide a xylose enrichment factor of at least 1.2 in the nanofiltration permeate, a permeate dilution factor higher than 0.2 and a xylose yield of more than 60% on xylose in the nanofiltration feed.