Lactone Solvent System for Biomass Hydrolysis
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Solution Overview
Problem
Current methods for carbohydrate recovery from lignocellulosic biomass face challenges such as glucose degradation at low temperatures, high catalyst costs, and inefficient product concentration due to short residence times and high temperatures, which hinder commercial viability.
Innovation Solution
A process using a solvent system comprising beta-, gamma-, and delta-lactones with at least 1 wt% water and an acid catalyst to convert water-insoluble carbohydrate polymers into water-soluble oligomers and monomers, allowing for partitioning into an aqueous layer for recovery and recycling of the lactone solvent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high mineral acid concentrations and/or ionic liquids are used to achieve higher yields at lower temperatures and longer residence times, then carbohydrate recovery yield is improved, but catalyst cost and complexity increase significantly
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using dilute acid concentrations (0.01-5 wt%) combined with specific organic solvents (gamma-valerolactone, delta-valerolactone, beta-butyrolactone) instead of traditional high-concentration acids or ionic liquids. This parameter change maintains high carbohydrate recovery yields while eliminating the need for expensive catalyst recovery systems.
Solution Approach 2:
The patent employs inexpensive, readily available organic solvents and dilute acids that can be used without recovery or recycling infrastructure. These simple, low-cost reagents replace expensive ionic liquids and complex catalyst systems, making the process economically viable through disposable rather than recyclable chemistry.
2Speed
If short residence time reactions at high temperatures are used, then processing speed is improved, but carbohydrate degradation increases and yields decrease
Solution Approach 1:
The patent introduces organic solvent intermediaries (gamma-valerolactone, delta-valerolactone, or beta-butyrolactone) that mediate the hydrolysis reaction, enabling fast processing at high temperatures while protecting carbohydrates from degradation. These solvents act as protective intermediaries that facilitate bond breaking without causing unwanted side reactions.
Solution Approach 2:
The patent changes the thermal and chemical parameters of the reaction system by combining elevated temperatures (100-300°C) with specific organic solvents and short residence times (1 minute to 24 hours). This parameter combination achieves rapid carbohydrate release while minimizing degradation through the protective effect of the organic solvent environment.
3Object-generated harmful factors
If aqueous solutions with low acid concentration are used, then carbohydrate degradation is minimized, but product concentration remains low (45-55% yield at 2-4 wt% sugar solution)
Solution Approach 1:
The patent merges the benefits of dilute acid systems (minimal carbohydrate degradation) with the advantages of organic solvents (enhanced solubilization and reaction efficiency). This combination allows operating at low acid concentrations (0.01-5 wt%) while achieving high product concentrations and yields through the synergistic effect of the organic solvent-acid system.
Solution Approach 2:
The patent creates a composite reaction system combining water, organic solvents (gamma-valerolactone, delta-valerolactone, or beta-butyrolactone), and dilute acid catalysts. This composite system exhibits properties superior to individual components, achieving both low degradation and high concentration through the synergistic interaction of its constituents.
4Manufacturing precision
If enzyme-based processes are used to achieve complete cellulose conversion at 50°C, then selectivity is improved, but enzyme cost and pretreatment requirements increase significantly
Solution Approach 1:
The patent replaces the biological enzyme system with a chemical system using organic solvents and dilute acids. This substitution eliminates the need for expensive enzymes and complex pretreatment processes while achieving comparable or superior conversion efficiency through purely chemical hydrolysis mechanisms.
Solution Approach 2:
The patent changes the operational parameters from mild enzymatic conditions (50°C, pH neutral) to more aggressive chemical conditions (100-300°C, acidic pH) combined with organic solvents. This parameter change enables direct hydrolysis without pretreatment while maintaining high selectivity through the specific chemical environment created by the solvent-acid system.
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 high carbohydrate yields with minimal degradation, enabling efficient recovery and concentration of glucose and xylose, reducing catalyst costs and improving process viability by promoting cellulose deconstruction and hydrolysis while allowing lactone recycling.
Implementation Method 1
reacting biomass or a biomass-derived reactant with a solvent system comprising (i) an organic solvent selected from the group consisting of beta-, gamma-, and delta-lactones, and combinations thereof, and (ii) at least about 1 wt % water; in the presence of an acid catalyst for a time and under conditions to yield a product mixture wherein at least a portion of water-insoluble C6-sugar-containing polymers or oligomers, or water-insoluble C5-sugar-containing polymers or oligomers, if present in the biomass or biomass-derived reactant, are converted to water-soluble C6-sugar-containing oligomers, C6-sugar monomers, C5-sugar-containing oligomers, C5-sugar monomers
Implementation Method 2
Optionally, a solute is added to the product mixture in an amount sufficient to cause partitioning of the product mixture into an aqueous layer and a substantially immiscible organic layer. The water-soluble products partition into the aqueous phase where they can be recovered
Data Source
AI summary
A process to produce an aqueous solution of carbohydrates that contains C6-sugar-containing oligomers, C6 sugar monomers, C5-sugar-containing oligomers, C5 sugar monomers, or any combination thereof is presented. The process includes the steps of reacting biomass or a biomass-derived reactant with a solvent system including a lactone and water, and an acid catalyst. The reaction yields a product mixture containing water-soluble C6-sugar-containing oligomers, C6-sugar monomers, C5-sugar-containing oligomers, C5-sugar monomers, or any combination thereof.