Process for producing ethanol
First Claim
1. A process for producing ethanol from raw materials containing a high dry solid mash level having fermentable sugars or constituents which can be converted into sugars, comprising the steps of:
- a. liquefaction of the raw materials in the presence of an alpha amylase to obtain liquefied mash;
b. saccharification of the liquefied mash in the presence of a glucoamylase to obtain hydrolysed starch and sugars;
c. fermentation of the hydrolysed starch and sugars by yeast to obtain ethanol; and
d. recovering the obtained ethanol, wherein an acid fungal protease is introduced to the liquefied mash during the saccharification and/or to the hydrolysed starch and sugars during the fermentation, thereby increasing the rate of production of ethanol as compared to a substantially similar process conducted without the introduction of the protease.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a process for producing ethanol from raw materials, that contain fermentable sugars or constituents which can be converted into sugars, comprising the steps of:
a-liquefaction of the raw materials in the presence of an alpha-amylase for obtaining liquefied mash,
b-saccharification of the liquefied mash in the presence of a glucoamylase for obtaining hydrolyzed starch and sugars,
c-fermentation of the hydrolyzed starch and sugars by yeast for obtaining ethanol, and
d-recovering alcohol,
a protease being introduced in the liquefied mash during the saccharification and/or in the hydrolyzed starch and sugars during the fermentation.
The invention relates also to a composition containing a glucoamylase and an acid fungal protease.
193 Citations
11 Claims
-
1. A process for producing ethanol from raw materials containing a high dry solid mash level having fermentable sugars or constituents which can be converted into sugars, comprising the steps of:
-
a. liquefaction of the raw materials in the presence of an alpha amylase to obtain liquefied mash; b. saccharification of the liquefied mash in the presence of a glucoamylase to obtain hydrolysed starch and sugars; c. fermentation of the hydrolysed starch and sugars by yeast to obtain ethanol; and d. recovering the obtained ethanol, wherein an acid fungal protease is introduced to the liquefied mash during the saccharification and/or to the hydrolysed starch and sugars during the fermentation, thereby increasing the rate of production of ethanol as compared to a substantially similar process conducted without the introduction of the protease. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification