NOVELTY - Improved process for hydrolysis of a pre-treated lignocellulosic biomass comprising a solid stream which comprises e.g. glucans and xylans, and liquid stream (80) comprising e.g. xylooligomers, comprises: (a) mixing solid stream and first portion of liquid stream; (b) hydrolyzing at least a portion of glucans in solid stream to glucose and at least a portion of xylooligomers in first portion of liquid stream to xylose in presence of first hydrolysis catalyst to create first hydrolysis mixture (20); and (c) removing at least a portion of monomeric sugars from first hydrolysis mixture.    USE - The process is useful for the hydrolysis of a pre-treated lignocellulosic biomass to glucose (claimed).    ADVANTAGE - The process improves the overall glucose yield.    DETAILED DESCRIPTION - Improved process for the hydrolysis of a pre-treated lignocellulosic biomass comprising a solid stream and a liquid stream (80), where the solid stream comprises glucans, xylans and compounds that are not glucans or xylans, the liquid stream comprises xylooligomers, water and compounds which are not xylooligomers, comprises: (a) mixing the solid stream and a first portion of the liquid stream; (b) hydrolyzing at least a portion of the glucans in the solid stream to glucose and at least a portion of the xylooligomers in the first portion of the liquid stream to xylose in the presence of a first hydrolysis catalyst to create a first hydrolysis mixture (20) having a first hydrolysis mixture monomeric sugars concentration and a first hydrolysis mixture hydrolysis catalyst concentration, where the first hydrolysis mixture has a first hydrolysis mixture catalyst to monomeric sugars ratio which is the ratio of the weight of the hydrolysis catalyst in the first hydrolysis mixture to the total weight of monomeric sugars in the first hydrolysis mixture; and (c) removing at least a portion of the monomeric sugars from the first hydrolysis mixture to create a first product stream (40) comprising water, glucose and xylose, where the first product stream has a first product stream monomeric sugars concentration, a first product stream catalyst concentration which could be zero and a first product stream catalyst to monomeric sugars ratio which is the ratio of first product stream catalyst concentration to the first product stream monomeric sugars concentration; and a partly hydrolyzed stream (50), which is the first hydrolysis mixture which has at least a portion of the monomeric sugars removed, where the removal of at least a portion of the monomeric sugars from the first hydrolysis mixture occurs while the hydrolysis of at least a portion of the glucans to glucose is still being conducted and the first hydrolysis mixture catalyst to monomeric sugars ratio is greater than or equal to the first product stream catalyst to monomeric sugars ratio.    DESCRIPTION OF DRAWING(S) - The figure shows improved process for the hydrolysis of a pre-treated lignocellulosic biomass comprising a solid stream and a liquid stream.    First hydrolysed mixture (20)    First product stream (40)    Partly hydrolyzed stream (50)    Liquid stream (80)    Vessel (100)