Cellulosic Material Liquefaction via Eutectic Solvent System
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Solution Overview
Problem
Current processes for liquefying cellulosic materials to produce biofuels are economically unattractive due to high solvent costs and inefficient utilization of feedstock, resulting in significant production of low-value insoluble humins and requiring multiple process steps.
Innovation Solution
A process involving simultaneous hydrolysis and hydrogenation of cellulosic materials using an acid catalyst, a solvent mixture with a co-solvent comprising polar solvents, and a hydrogenation catalyst, which reduces the amount of unwanted humins and increases the degree of liquefaction, producing valuable monomeric and oligomeric compounds with high saturation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional liquefaction processes use large amounts of expensive solvents, then the liquefaction can proceed, but the process becomes economically unattractive
Solution Approach 1:
The invention changes the chemical composition parameters of the solvent system by using a eutectic mixture of choline chloride and urea instead of conventional large amounts of expensive solvents. This parameter change maintains effective liquefaction while dramatically reducing solvent quantity and cost.
Solution Approach 2:
The invention employs inexpensive, readily available materials (choline chloride and urea) as the solvent system instead of expensive conventional solvents. These cheap components can be easily replaced or regenerated, making the process economically viable.
2Productivity
If conventional processes produce large amounts of insoluble humins, then the reaction can proceed, but feedstock utilization becomes inefficient
Solution Approach 1:
The invention converts the harmful effect of humin formation into a beneficial outcome by using the eutectic solvent system that prevents excessive humin precipitation. The solvent maintains reaction intermediates in solution, allowing continued reaction progress without feedstock loss to insoluble byproducts.
Solution Approach 2:
The eutectic mixture acts as an intermediary medium that facilitates the conversion of cellulosic material while preventing the formation of insoluble humins. It mediates between the reactants and products, keeping the system homogeneous and maximizing feedstock utilization.
3Reliability
If multiple process steps are used to convert cellulosic material to fuel components, then complete conversion can be achieved, but the process complexity increases
Solution Approach 1:
The invention merges multiple conventional process steps into a single integrated reaction system. The eutectic solvent enables simultaneous hydrolysis, liquefaction, and stabilization of products in one step, eliminating the need for separate pretreatment and purification stages.
Solution Approach 2:
The eutectic mixture of choline chloride and urea performs multiple functions simultaneously: it acts as a solvent, catalyst, and stabilizing agent for the reaction intermediates. This multi-functionality reduces the number of separate process units and steps required.
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
The process achieves a higher degree of liquefaction, reduces the number of process steps, and produces more valuable products with improved chemical stability, allowing direct use as fuel components or further processing in refineries without additional pretreatment.
Implementation Method 1
contacting the cellulosic material simultaneously with (a) an acid catalyst
Implementation Method 2
contacting the cellulosic material simultaneously with (c) a hydrogenation catalyst; and (d) a source of hydrogen
Data Source
AI summary
A process for liquefying a cellulosic material to produce a liquefied product from cellulosic material is provided. Products obtained from such process and use of such products to prepare biofuels is also provided.