Cellulolytic Enzyme Addition for Ethanol Yield in Corn Dry Milling
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Solution Overview
Problem
The dry grind ethanol production process from corn has reached a maximum output limit without significant cost or equipment investment, limiting further efficiency improvements.
Innovation Solution
The application of cellulolytic enzymes from Trichoderma reesei, specifically from AB Enzymes, in combination with conventional glucoamylase for simultaneous saccharification of starch and fiber in ground whole corn, at an economic enzyme dosing, enhances ethanol yield and process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dry grind process is used, then process simplicity and low equipment cost are maintained, but ethanol production reaches maximum output limit
Solution Approach 1:
Cellulolytic enzymes act as intermediaries to facilitate the breakdown of fiber material into fermentable sugars, enabling enhanced ethanol production without requiring complex equipment modifications or process reengineering
Solution Approach 2:
The invention changes the chemical parameter of the system by introducing cellulolytic enzymes that catalyze the hydrolysis of beta-1,4-glycosidic bonds in fiber, converting recalcitrant material into可利用 sugars that yeast can ferment into additional ethanol
2Productivity
If enzyme dosing is increased, then ethanol production increases by 4% to 22%, but processing cost increases
Solution Approach 1:
The invention applies partial action by using sub-optimal enzyme dosing levels (0.01% to 0.1% wt/wt) that provide sufficient cellulolytic activity to release fermentable sugars from fiber without incurring the full cost of complete hydrolysis, achieving economical enhancement of ethanol production
Solution Approach 2:
The fermentation process itself serves to convert the released sugars into ethanol, with the yeast naturally performing the conversion without additional energy input or equipment, and the DDGS co-product naturally having reduced fiber content as a beneficial side effect
3Productivity
If simultaneous saccharification of starch and fiber is performed, then process efficiency improves, but enzyme interaction complexity increases
Solution Approach 1:
The invention merges the starch hydrolysis function (performed by glucoamylase) and fiber hydrolysis function (performed by cellulolytic enzymes) into a single simultaneous saccharification step, allowing both processes to occur concurrently in the same reactor without requiring separate processing stages
Solution Approach 2:
The fermentation system is designed to handle multiple substrate types (starch and fiber) simultaneously, with the yeast performing a universal fermentation function on all available sugars regardless of their source, and the DDGS co-product serving multiple uses including animal feed and fuel blends
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases ethanol production by 4% to 22% depending on enzyme dose and mash concentration, achieves energy savings, reduces water and gas use, and improves the quality of co-products like DDGS with higher protein and lipid content and reduced fiber.
Implementation Method 1
cellulolytic enzymes from Trichoderma reesei, specifically from AB Enzymes, in combination with conventional glucoamylase for simultaneous saccharification of starch and fiber in ground whole corn
Implementation Method 2
cellulolytic enzymes from Trichoderma reesei, specifically from AB Enzymes, in combination with conventional glucoamylase for simultaneous saccharification of starch and fiber
Implementation Method 3
Ethanol made by anaerobic fermentation of sugars by yeast is the major fuel product made from renewable resources
Implementation Method 4
the corn starch gelatinized by heating followed by treatment with starch degrading enzymes
Data Source
AI summary
A method to increase ethanol production from a corn dry-mill process is described that comprises adding an enzyme preparation derived from Trichoderma reesei having cellulolytic activity to a saccharification process that includes conventional alpha amylase and glucoamylase. The addition of the cellulolytic enzyme decreases viscosity of the saccharified mash and can increase ethanol yield from a dry grind fermentation by as much as 10% or more. Specific characteristics are provided to show surprising and advantageous results of one particular preparation of cellulolytic enzymes from T. reesei.