Ionic Liquid Hydrolysis of Lignocellulose
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Solution Overview
Problem
Current methods for hydrolyzing lignocellulose to produce monosaccharides, such as enzymatic and chemical processes, face challenges with low yields and high costs due to the recalcitrance of plant cell walls and the hazards associated with handling concentrated acids.
Innovation Solution
A high-yielding process involving chemical hydrolysis of lignocellulose in an ionic liquid with catalytic acid, where water is gradually added to achieve high glucose yields while minimizing the formation of undesired by-products, eliminating the need for enzymes and concentrated acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If concentrated acid is used for hydrolysis, then sugar yield is improved, but safety hazards and handling complexity increase
Solution Approach 1:
The patent uses ionic liquid as an intermediary solvent to enable hydrolysis with dilute acid instead of requiring concentrated acid. The ionic liquid facilitates the reaction by dissolving cellulose and enhancing acid catalysis, allowing the use of safer dilute acid conditions while maintaining high sugar yields comparable to concentrated acid methods.
2Productivity
If water is added to hydrolysis reaction, then sugar yield is improved, but by-product formation increases
Solution Approach 1:
The patent optimizes the water content parameter in the hydrolysis reaction by conducting the reaction in ionic liquid with controlled water addition. This parameter control allows sufficient water for hydrolysis to achieve high sugar yields while limiting excess water that would promote dehydration by-products like HMF and levulinic acid.
3Object-affected harmful factors
If enzymatic hydrolysis is used, then safety is improved, but cost and time increase
Solution Approach 1:
The patent replaces enzymatic hydrolysis with chemical hydrolysis using dilute acid in ionic liquid. This substitution eliminates the need for expensive enzymes and lengthy reaction times while maintaining safety by avoiding concentrated acids, achieving both economic and safety benefits.
4Productivity
If concentrated acid hydrolysis is used, then sugar yield is improved, but process complexity increases
Solution Approach 1:
The ionic liquid acts as a mediator that simplifies the hydrolysis process by enabling the use of dilute acid instead of concentrated acid. This eliminates the need for complex acid recycling systems and hazardous material handling infrastructure, reducing overall process complexity while maintaining high sugar yields.
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 glucose yields of up to 90% from cellulose and 70-80% from untreated corn stover, providing a sustainable source of sugars for microbial growth and biocatalytic ethanol production, with improved safety and reduced costs.
Implementation Method 1
Like concentrated acids, ionic liquids comprised of chloride, acetate, and other moderately basic anions disrupt the hydrogen bond network of cellulose and enable its dissolution
Implementation Method 2
by catalyzing the hydrolysis of glycosidic bonds, strong acids cleave cellulose and hemicellulose into sugars
Implementation Method 3
concentrated acid can play a dual role in biomass hydrolysis... by catalyzing the hydrolysis of glycosidic bonds
Implementation Method 4
Adding water gradually to a chloride ionic liquid containing catalytic acid leads to a nearly 90% yield of glucose from cellulose
Data Source
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AI summary
High-yielding method for chemical hydrolysis of lignocellulose into monosaccharides. The process of the invention can additionally be applied to cellulose, xylan and related biomass polysaccharides, such as galactan, mannan, or arabinan. The method is employed for hydrolysis of a biomass polysaccharide substrate. The process is carried out in an ionic liquid in which cellulose is soluble in the presence of catalytic acid at a temperature sufficiently high to initiate hydrolysis. Water is added to the reaction mixture after initiation of hydrolysis at a rate controlled to avoid precipitation yet avoid undesired sugar dehydration products such ad HMF. Hydrolysis product is useful as feedstock for fermentations including fermentation processes for ethanol, butanol and other fuels.