Lignocellulosic Pretreatment with Deep Eutectic Solvents
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Solution Overview
Problem
Current methods for producing fermentable sugars from lignocellulosic materials are hindered by high costs, low efficiency, adverse reaction conditions, and environmental concerns, particularly due to the need for large enzyme additions during hydrolysis processes.
Innovation Solution
A pretreatment method using a solution comprising 80% to 99% glycerol, 0.5% to 2% acid catalyst, and 5% to 20% water at 80°C to 150°C to partially hydrolyze lignocellulosic materials, followed by enzymatic hydrolysis, which reduces hemicellulose content and increases enzymatic digestibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional chemical and/or physical pretreatment methods are used to disrupt the natural structure of lignocellulosic material, then the material can be converted to fermentable sugars, but the process incurs high costs, low efficiency, and produces adverse reaction conditions
Solution Approach 1:
The invention changes the chemical parameters of the pretreatment solution by using deep eutectic solvents with specific molar ratios of choline chloride to organic acids (1:2 to 1:8), operating at moderate temperatures (50-100°C) and pH levels (2-4), which optimizes both conversion efficiency and reduces operational complexity compared to conventional harsh chemical treatments
Solution Approach 2:
The invention employs composite pretreatment solutions combining choline chloride with various organic acids (oxalic acid, malonic acid, succinic acid, etc.) to create deep eutectic solvents that exhibit synergistic effects, improving conversion efficiency while maintaining environmentally friendly conditions and reducing costs
2Productivity
If large amounts of enzymes are added to achieve effective hydrolysis of cellulose and hemicellulose, then fermentable sugars are produced, but the costs increase significantly
Solution Approach 1:
The invention performs preliminary chemical pretreatment using deep eutectic solvents that partially hydrolyze cellulose and hemicellulose and disrupt the lignocellulosic structure before enzymatic hydrolysis, which pre-digests the material and reduces the enzyme quantity needed by up to 50% while maintaining high hydrolysis efficiency
Solution Approach 2:
The deep eutectic solvent acts as an intermediary that facilitates both chemical and enzymatic hydrolysis processes, creating a synergistic effect where the pretreated material becomes more accessible to enzymes, thereby reducing enzyme requirements while maintaining or improving overall hydrolysis efficiency
3Productivity
If conventional pretreatment processes are used to achieve effective hydrolysis, then fermentable sugars are produced, but the processes are not environmentally friendly and produce undesirable byproducts
Solution Approach 1:
The invention converts the typically harmful high-temperature and high-acidity conditions of conventional pretreatment into beneficial moderate conditions (50-100°C, pH 2-4) using deep eutectic solvents, which maintain effective sugar production while eliminating harmful byproducts like furfural and HMF, and enable easy solution recovery and reuse
Solution Approach 2:
The invention uses inexpensive, biodegradable organic acids (oxalic acid, malonic acid, succinic acid) as components of the pretreatment solution that can be easily degraded and do not persist in the environment, replacing expensive and environmentally persistent conventional chemicals, while the pretreatment solution can be recovered and reused multiple times
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 method enhances enzymatic digestibility of lignocellulosic materials by up to two times, reduces undesirable byproducts, and allows for the reuse of pretreatment solutions, thereby improving the efficiency and cost-effectiveness of biofuel production.
Implementation Method 1
pretreating a lignocellulosic material with a pretreatment solution comprising glycerol in an amount of 80% to 99% by weight of the pretreatment solution, an acid catalyst in an amount of 0.5% to 2% by weight of the pretreatment solution, and water in an amount of 5% to 20% by weight of the pretreatment solution, at a temperature from 80°C to 150°C, thereby producing a pretreated partially hydrolyzed lignocellulosic material
Implementation Method 2
pretreating a lignocellulosic material with a pretreatment solution comprising glycerol in an amount of 80% to 99% by weight of the pretreatment solution, an acid catalyst in an amount of 0.5% to 2% by weight of the pretreatment solution, and water in an amount of 5% to 20% by weight of the pretreatment solution, at a temperature from 80°C to 150°C
Data Source
Figure 1
Figure 2a~2c
Figure 3(a)~3(c)
AI summary
The present invention provides compositions and methods for the pretreatment of lignocellulosic material. The present invention further provides for pretreated lignocellulosic material that can be used to produce useful products, such as fermentable sugars.