Patent ID: 6942754

Claim:
A process for producing xylooligosaccharide from a lignocellulose pulp comprising the steps of: enzyme-treating a linocellulose pulp with hemicellulase; filtering the resultant reaction mixture delivered from the enzyme treatment step to separate a liquid fraction from the enzyme-treated pulp: subjecting the liquid fraction delivered from the filtration step to a permeation treatment through a separation membrane to cause a non-permeated fraction containing xylooligosaccharide-lignin complex to be separated in an increased concentration thereof from a permeated fraction; collecting the non-permeated fraction containing the xylooligosaccharide-lignin complex in the increased concentration; adjusting the pH value of the collected non-permeated fraction to the range of from 1.5 to 5, by adding an acid to the collected non-permeated fraction to liberate xylooligosaccharide from the xylooligosaccharide-lignin complex; and recovering the liberated xylooligosaccharide.