Self-Sufficient Enzymatic Hydrolysis of Lignocellulose
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Solution Overview
Problem
Current processes for converting lignocellulosic biomass to ethanol are inefficient due to high costs and energy requirements for enzymatic hydrolysis, particularly at high solids concentrations, and are hindered by enzyme inhibition and the need for separate enzyme production, which limits the production of soluble sugars.
Innovation Solution
A self-sufficient enzymatic hydrolysis process that involves pretreating lignocellulose-containing material, contacting it with hydrolases, separating the hydrolyzate, fermenting part of it with enzymes-producing microorganisms, and redirecting the fermented hydrolyzate back to the hydrolysis vessel after removing inhibitory substances, allowing for continuous and efficient enzyme production and increased soluble carbohydrate production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If enzymatic hydrolysis is conducted at high solids content to improve process efficiency and reduce downstream processing costs, then productivity increases, but enzyme distribution becomes uneven and hydrolysis efficiency decreases
Solution Approach 1:
The patent applies preliminary action by conducting enzymatic hydrolysis at lower solids content (10-20% w/w) in a first hydrolysis step to ensure uniform enzyme distribution and optimal hydrolysis efficiency. This preliminary hydrolysis produces a hydrolyzate that is then used as fermentation medium, allowing the process to achieve high overall efficiency without compromising the hydrolysis step itself.
2Manufacturing precision
If separate enzyme production is conducted using artificial media to ensure consistent enzyme quality, then manufacturing precision is improved, but process complexity and costs increase
Solution Approach 1:
The patent merges the enzyme production function with the existing fermentation process by using the hydrolyzate from the first hydrolysis step as the fermentation medium for producing hydrolases. This integration eliminates the need for separate artificial media preparation and reduces overall process complexity while maintaining enzyme production efficiency.
Solution Approach 2:
The system applies self-service by using the process's own hydrolyzate output as the input medium for enzyme production. The hydrolyzate naturally contains nutrients and conditions suitable for microbial growth and enzyme secretion, allowing the process to sustain itself without external artificial media inputs.
3Productivity
If the entire hydrolyzate is used for fermentation to maximize product yield, then productivity increases, but inhibitory substances accumulate and reduce enzyme activity
Solution Approach 1:
The patent segments the hydrolyzate into two parts: one portion is used as fermentation medium for producing hydrolases, while the other portion can be discarded or used for different purposes. This segmentation allows the fermentation process to operate with controlled substrate concentration, avoiding excessive accumulation of inhibitory substances while still achieving high product yields.
4Speed
If enzyme concentration is increased to improve hydrolysis rate, then speed increases, but process costs increase due to higher enzyme expenditure
Solution Approach 1:
The patent implements continuity of useful action by integrating enzyme production into the fermentation step using the hydrolyzate as medium. The produced hydrolases are then fed back to the hydrolysis step, creating a continuous cycle where enzymes are constantly regenerated. This self-sustaining enzyme supply reduces the need for continuous external enzyme additions, thereby reducing enzyme costs while maintaining high hydrolysis rates.
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 process achieves high efficiency and cost-effectiveness by integrating enzyme production on-site, maximizing soluble carbohydrate yields, and enabling continuous operation by removing inhibitory substances, thus overcoming previous limitations in enzyme production and hydrolysis efficiency.
Implementation Method 1
enzymatic hydrolysis of lignocellulosic material... contacting the pretreated lignocellulosic material with at least one enzyme belonging to the class of hydrolases
Implementation Method 2
fermenting part (i) of the hydrolyzate with at least one microorganism and/or fungus capable of the production of at least one enzyme belonging to the class of hydrolases
Data Source
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AI summary
The present invention is directed to a process for self-sufficient hydrolysis of lignocellulosic material. In an additional aspect, the present invention is directed to a process for the production of an organic product and the organic product produced according to this process.