Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars
First Claim
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1. A process for the preparation of a sugar product from ligno-cellulosic material, comprising:
- enzymatic hydrolysis of ligno-cellulosic material using an enzyme composition comprising at least two cellulases and whereby the enzyme composition at least comprises GH61; and
wherein;
the enzymatic hydrolysis occurs for a first part of time and a subsequent second part of time;
during the first part of time dissolved oxygen in the ligno-cellulosic material is at a concentration that is at least 50% less than during the second part of time, during the second part of time oxygen is added to the ligno-cellulosic material continuously, and the second part of time is 2% to 80% of the total enzymatic hydrolysis time; and
the ligno-cellulosic material has a dry matter content of 10 wt % or more.
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Abstract
The invention relates to a process for the preparation of a sugar product from ligno-cellulosic material, comprising the following steps:
- a) optionally pre-treatment of the ligno-cellulosic material;
- b) optionally washing of the optionally pre-treated ligno-cellulosic material;
- c) 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
- d) 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.
19 Citations
14 Claims
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1. A process for the preparation of a sugar product from ligno-cellulosic material, comprising:
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enzymatic hydrolysis of ligno-cellulosic material using an enzyme composition comprising at least two cellulases and whereby the enzyme composition at least comprises GH61; and wherein; the enzymatic hydrolysis occurs for a first part of time and a subsequent second part of time; during the first part of time dissolved oxygen in the ligno-cellulosic material is at a concentration that is at least 50% less than during the second part of time, during the second part of time oxygen is added to the ligno-cellulosic material continuously, and the second part of time is 2% to 80% of the total enzymatic hydrolysis time; and the ligno-cellulosic material has a dry matter content of 10 wt % or more. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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2. A process for the preparation of a sugar product from ligno-cellulosic material, comprising:
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enzymatic hydrolysis of ligno-cellulosic material using an enzyme composition comprising at least two cellulases and whereby the enzyme composition at least comprises GH61;
wherein;the enzymatic hydrolysis occurs for a first part of time and a subsequent second part of time; during the first part of time dissolved oxygen in the ligno-cellulosic material is at a concentration that is at least 50% less than during the second part of time, during the second part of time oxygen is added to the ligno-cellulosic material discontinuously, and the second part of time is 2% to 80% of the total enzymatic hydrolysis time; and the ligno-cellulosic material has a dry matter content of 10 wt % or more.
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Specification