PROCESS FOR ENZYMATIC HYDROLYSIS OF LIGNOCELLULOSIC MATERIAL AND FERMENTATION OF SUGARS

摘要

The invention relates to a process for the preparation of a sugar product from ligno cellulosic material , comprising the following steps: optionally pre- treatment of the ligno -cellulosic material; optionally washing of the optionally pre treated ligno- cellulosic material; enzymatic hydrolysis of the optionally washed and/or optionally pre- treated ligno -cellulosic material using an enzyme composition comprising at least two cellulase and whereby the enzyme composition at least comprises GH61;and optionally recovery of a sugar product; wherein during part of the time of the enzymatic hydrolysis ,oxygen is added to the ligno- cellulosic material and during part of the time of the enzymatic hydrolysis less oxygen is added to the ligno -cellulosic material compared to the other part of the time of the enzymatic hydrolysis ,preferably no oxygen is added to the ligno- cellulosic material.