Enzymatic Hydrolysis of Lignocellulosic Material
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Solution Overview
Problem
The high cost of enzyme production and lengthy process times in the hydrolysis and fermentation of lignocellulosic materials hinder the economic viability of biofuel production from these materials.
Innovation Solution
A process involving a two-step hydrolysis with a feeding step and a saccharification step, where enzymes are present from the start, allowing controlled viscosity and oxygen supply, optimizing conditions such as temperature and pH, and using thermostable enzymes to reduce enzyme dosage and process time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hydrolysis and fermentation processes are used, then sugars can be converted into fermentation products, but the process time is lengthy (up to 13 days) and enzyme production costs are high
Solution Approach 1:
The patent applies preliminary action by conducting a fed-batch hydrolysis step before the main saccharification step. During the feeding step, enzymes are added progressively to pretreated lignocellulosic material, partially hydrolyzing it and releasing sugars that can be immediately fermented. This preliminary hydrolysis action reduces the burden on the subsequent saccharification step, thereby shortening the overall process time while maintaining high conversion rates.
Solution Approach 2:
The patent segments the hydrolysis process into two distinct steps: a fed-batch hydrolysis step and a saccharification step. The fed-batch step involves progressive addition of pretreated material to an enzyme-containing vessel, while the saccharification step involves adding the remaining material to a separate vessel. This segmentation allows each step to be optimized independently, reducing total process time while maintaining high sugar yields.
2Productivity
If enzyme dosage is increased to improve conversion rates, then productivity increases, but production costs increase due to high enzyme production costs
Solution Approach 1:
The patent applies continuity of useful action by maintaining enzyme activity throughout the fed-batch hydrolysis process. Enzymes are added progressively with each batch of pretreated material, ensuring continuous hydrolysis action. This continuous enzyme presence maximizes the utilization of enzyme activity, achieving high conversion yields without requiring excessive enzyme dosages, thereby reducing production costs.
Solution Approach 2:
The patent applies dynamics by adjusting enzyme dosage dynamically during the fed-batch process. Instead of adding all enzymes at once, the enzyme composition is added progressively with each feeding batch, allowing the system to adapt enzyme activity to the actual hydrolysis needs at each stage. This dynamic approach optimizes enzyme utilization efficiency, reducing total enzyme consumption while maintaining high productivity.
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 reduces enzyme consumption, shortens process time, and lowers production costs by maintaining enzyme activity and efficiency, resulting in higher yields and more robust production processes.
Implementation Method 1
cellulose present in the lignocellulosic material is partly (typically 30 to 95%, dependable on enzyme activity and hydrolysis conditions) converted into reducing sugars by cellulolytic enzymes
Implementation Method 2
The sugars are then converted into valuable fermentation products such as ethanol by microorganisms like yeast
Data Source
AI summary
The invention relates to a process for the preparation of a sugar and/or fermentation product from lignocellulosic material.