Ionic Liquid Cellulose Hydrolysis Conversion Method
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Solution Overview
Problem
Current chemical methods for hydrolyzing cellulose to produce water-soluble monosaccharides, disaccharides, and oligosaccharides face challenges with low yields and require extreme conditions, necessitating a more efficient and mild process.
Innovation Solution
The use of specific ionic liquids with asymmetric cations and strong acids in the presence of water to solvate and hydrolyze cellulose, allowing for the conversion of cellulose into water-soluble derivatives under relatively mild conditions, with the ionic liquid being capable of dissolving at least some cellulose and existing in a liquid state at temperatures below 150°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dilute acid treatment at high temperatures and pressures is used to hydrolyze cellulose, then the hydrolysis reaction can proceed, but the reaction conditions become extreme and require high energy input
Solution Approach 1:
The patent changes the physical state parameter of the reaction system by introducing ionic liquid as a solvent medium. This parameter change allows the hydrolysis reaction to proceed at lower temperatures (below 150°C) compared to conventional high-temperature acid hydrolysis, while maintaining effective reaction rates through the unique solvation properties of the ionic liquid
2Temperature
If concentrated acid pre-treatment is used to hydrolyze cellulose, then the reaction can proceed under lower temperature conditions, but the acid concentration must be raised to 70% through energy-intensive dewatering
Solution Approach 1:
The ionic liquid acts as an intermediary substance that facilitates cellulose dissolution and hydrolysis without requiring concentrated acid conditions or energy-intensive dewatering steps. The ionic liquid medium enables the reaction to proceed efficiently at lower acid concentrations and temperatures, eliminating the need for high-energy dewatering operations
3Productivity
If conventional chemical hydrolysis methods are used, then the process can be implemented, but the conversion yield to sugars remains low
Solution Approach 1:
The patent employs parameter changes by utilizing ionic liquid as a reaction medium, which fundamentally alters the solvation environment for cellulose hydrolysis. This parameter change leads to improved conversion yields to sugars by enhancing the accessibility of acid catalysts to cellulose bonds and stabilizing the hydrolysis intermediates in the ionic liquid medium
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 achieves a rapid and high conversion of cellulose to water-soluble products, such as glucose and its oligomers, under mild conditions, enhancing the efficiency of the hydrolysis process and facilitating the production of biofuels.
Implementation Method 1
admixing cellulose with an ionic liquid capable of solvating or dissolving at least some of the cellulose
Implementation Method 2
treating the resulting solvate or solution with an acid in the presence of water to produce water-soluble monosaccharide, disaccharide and oligosaccharide
Data Source
AI summary
A process is described for the preparation of water-soluble cellulose hydrolysis products, which comprises admixing cellulose with an ionic liquid capable of solvating or dissolving at least some of the cellulose, said ionic liquid being a compound comprised solely of cations and anions and which exists in a liquid state at a temperature at or below 15O °C, the cations in said ionic liquid having the general formula (I), in which Z represents a nitrogen or phosphorus atom, R1 represents a methyl or ethyl group, each of R2 and R3, which may be the same or different, is selected from C4-3alkyl, optionally-substituted benzyl, optionally-substituted phenyl, and C5-7 cycloalkyl, and R4 represents C1-8 alkyl, optionally-substituted benzyl, optionally-substituted phenyl or C5-7cyclohexyl; in which the optional substituents on a benzyl or phenyl ring are one, two or three substituents selected from C1-4alkyl or alkoxy groups, halogen atoms and nitro groups; and treating the resulting solvate or solution with an acid in the presence of water, said acid having a pKa in water of less than 2 at 25°C.