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 lignocellulosic material, comprising:
- enzymatic hydrolysis and oxidation of the lignocellulosic material in the presence of an enzyme composition comprising at least two cellulases and a lytic polysaccharide monooxygenase (LPMO);
adding 20-10,000 mmol of oxygen per kg glucan to the lignocellulosic material during the enzymatic hydrolysis;
wherein the enzymatic hydrolysis is conducted until at least 70% of available sugar in the lignocellulosic material is released; and
wherein at the end of the enzymatic hydrolysis the amount of gluconic acid formed during oxidation of the lignocellulosic material is kept between 3 to 10 g/kg glucan present in the lignocellulosic material.
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Abstract
The invention relates to a process for the preparation of a fermentation product from lignocellulosic material, comprising the following steps:
- a) optionally, pretreatment of the lignocellulosic material,
- b) optionally, washing of the optionally pretreated lignocellulosic material,
- c) enzymatic hydrolysis of the optionally washed and/or optionally pretreated lignocellulosic material using an enzyme composition comprising at least two cellulases and whereby the enzyme composition at least comprises LPMO, and optionally purifying the hydrolysed lignocellulosic material,
- d) fermentation of the hydrolysed lignocellulosic material to produce a fermentation product, and
- e) optionally, recovery of a fermentation product,
- wherein the amounts of formed hydrolysed oxidation products at the end of the enzymatic hydrolysis by the oxidation by LPMO of the lignocellulosic material containing cellulose and/or cello-oligosaccharides is kept between 3 to 80 g/kg glucan present in the lignocellulosic material by adding a suitable amount of oxygen after the pre-treatment and before and/or during the enzymatic hydrolysis to the lignocellulosic material, preferably the formed hydrolysed oxidation product is gluconic acid, an aldonic acid and/or geminal diol, more preferably the hydrolysed oxidation product is gluconic acid.
19 Citations
25 Claims
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1. A process for the preparation of a sugar product from lignocellulosic material, comprising:
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enzymatic hydrolysis and oxidation of the lignocellulosic material in the presence of an enzyme composition comprising at least two cellulases and a lytic polysaccharide monooxygenase (LPMO); adding 20-10,000 mmol of oxygen per kg glucan to the lignocellulosic material during the enzymatic hydrolysis; wherein the enzymatic hydrolysis is conducted until at least 70% of available sugar in the lignocellulosic material is released; and wherein at the end of the enzymatic hydrolysis the amount of gluconic acid formed during oxidation of the lignocellulosic material is kept between 3 to 10 g/kg glucan present in the lignocellulosic material. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22)
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2. A process for the preparation of a fermentation product from lignocellulosic material, comprising:
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a) enzymatic hydrolysis and oxidation of the lignocellulosic material in the presence of an enzyme composition comprising at least two cellulases and and a lytic polysaccharide monooxygenase (LPMO) to produce a hydrolysed lignocellulosic material; adding 20-10,000 mmol of oxygen per kg glucan to the lignocellulosic material before and/or during the enzymatic hydrolysis wherein the enzymatic hydrolysis is conducted until at least 70% of available sugar in the lignocellulosic material is released; and b) fermentation of the hydrolysed lignocellulosic material to produce a fermentation product, wherein at the end of the enzymatic hydrolysis the amount of gluconic acid formed during LPMO oxidation of the lignocellulosic material is kept between 3 to 10 g/kg glucan present in the lignocellulosic material. - View Dependent Claims (3, 4, 18, 23, 24, 25)
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Specification