Acid-Base Mixture Catalyst for Lignocellulose Pretreatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current biofuel production from lignocellulose is hindered by the recalcitrance of lignocellulose, leading to sugar loss and inhibition of yeast fermentation due to degradative products, and involves complex and costly processes such as solid/liquid separation, detoxification, and neutralization, which increase operating costs and reduce yield.
Innovation Solution
A method using an acid-base mixture catalyst with a pH value of 1 to 4 for pretreating lignocellulosic biomass, allowing for simultaneous saccharification and fermentation in one reactor, thereby simplifying the process and reducing costs by minimizing inhibitor generation and eliminating additional neutralization steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strong acid or strong base pretreatment is used to alleviate lignocellulose recalcitrance, then pretreatment effectiveness is improved, but degradative products (furfural, etc.) are generated causing sugar loss and yeast fermentation inhibition
Solution Approach 1:
The patent changes the pH parameter from extreme strong acid/strong base conditions to a moderate acidic range (pH 1-4), and controls temperature and time parameters to achieve effective pretreatment without generating excessive degradative products. This parameter optimization resolves the contradiction between pretreatment effectiveness and harmful product generation.
Solution Approach 2:
The patent uses a composite catalyst system combining acid and base components with specific buffering capacity, rather than relying on extreme pH conditions alone. This composite approach maintains pretreatment effectiveness while reducing the formation of harmful degradative products through balanced chemical action.
2Object-affected harmful factors
If conventional multi-step process (solid/liquid separation, washing, detoxification, neutralization) is used, then inhibitor removal is achieved, but total operating costs significantly increase
Solution Approach 1:
The patent merges pretreatment, enzymatic hydrolysis, and fermentation into a single integrated one-pot process. The acid-base mixture catalyst performs multiple functions including pretreatment and buffering during fermentation, eliminating the need for separate solid/liquid separation, washing, detoxification, and neutralization steps, thus reducing both complexity and cost.
Solution Approach 2:
The acid-base mixture catalyst serves multiple functions: it acts as a pretreatment agent to alleviate recalcitrance, provides buffering capacity during fermentation to maintain optimal pH, and reduces inhibitor formation. This multi-functionality eliminates the need for multiple separate process steps.
3Stability of the object's composition
If conventional multi-step process with separate neutralization is used, then pH control is achieved, but additional operating costs and process steps are required
Solution Approach 1:
The acid-base mixture catalyst provides buffering capacity that maintains optimal pH throughout the one-pot process, combining pretreatment and fermentation pH control in a single system. This eliminates separate neutralization steps and improves overall process efficiency while maintaining stable pH conditions.
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 enhances saccharification efficiency, increases ethanol production yield, and significantly reduces overall operating costs by integrating pretreatment, enzymatic hydrolysis, and fermentation in a single reactor, eliminating the need for separate steps like solid/liquid separation and neutralization.
Implementation Method 1
reacting an acid-base mixture catalyst having a pH value of 1 to 4 with lignocellulosic biomass
Implementation Method 2
a major pretreatment process is performed at a high temperature and a pH in a range of a strong acid or a strong base, degradative products (furfural, etc.) are generated
Data Source
AI summary
The present invention relates to a method for pretreating lignocellulose by using an acid-base mixture catalyst. The method pretreats lignocellulose, by using a mixture catalyst of an acid and a base, so as not to pass through additional neutralization steps, and carries out pretreatment and simultaneous saccharification and fermentation through an identical single reactor process, thereby having an effect of producing ethanol in an excellent production yield from lignocellulosic biomass while simplifying the total process and reducing equipment costs and total processing costs.