Base-Catalyzed Biomass Conversion to Liquid Hydrocarbons
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Solution Overview
Problem
Current biomass conversion processes are inefficient and unable to effectively utilize all components of biomass feedstock, particularly cellulose and lignin, due to high energy requirements, low yields, and poor product quality, especially for wet and whole-plant biomass.
Innovation Solution
A method involving a base-catalyzed decarboxylation reaction with an excess base at moderate temperatures, which converts biomass feedstock to liquid hydrocarbons and carbon dioxide, allowing for complete or nearly complete conversion of all biomass components, including cellulose and lignin, without the need for expensive pretreatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature gasification or pyrolysis is used for biomass conversion, then conversion of biomass components can be achieved, but energy efficiency is reduced due to high temperature requirements
Solution Approach 1:
The invention changes the temperature parameter from high temperature (gasification/pyrolysis) to moderate temperature (hydrolysis conditions), and changes the chemical environment parameter by introducing base catalyst and excess base to enable complete conversion at lower energy input
Solution Approach 2:
The invention utilizes phase transition of water from liquid to vapor phase at moderate temperatures to achieve complete biomass conversion, where the vapor phase water acts as both solvent and reactant in the hydrolysis reaction
2Adaptability or versatility
If wet biomass conversion is performed, then common and economically viable biomass forms can be processed, but intensive energy requirements for pretreatment are needed
Solution Approach 1:
The invention makes the wet biomass serve itself by using its inherent moisture content as the water source for hydrolysis reaction, eliminating the need for external water addition and energy-intensive drying or pretreatment steps
Solution Approach 2:
The invention changes the moisture content parameter from a limitation requiring pretreatment to a beneficial reactant source, enabling direct conversion of wet biomass without energy-intensive pretreatment
3Productivity
If conventional biomass conversion processes are used, then some biomass components can be converted, but major components like cellulose and lignin are not well utilized
Solution Approach 1:
The invention creates a universal conversion system where the base-catalyzed hydrolysis mechanism can convert all major biomass components (cellulose, hemicellulose, lignin, starch, proteins, fats) through a single reaction pathway, making the process multi-functional for diverse feedstocks
Solution Approach 2:
The invention changes the pH parameter to basic conditions (excess base) which enables simultaneous hydrolysis of all biomass components including lignin, whereas conventional acidic or neutral processes cannot effectively convert lignin
4Adaptability or versatility
If hydrothermal liquefaction is used for biomass conversion, then wet biomass can be processed, but crosslinking of reaction intermediates results in low yields and poor product quality
Solution Approach 1:
The invention changes the pH parameter from neutral (hydrothermal liquefaction) to basic (excess base conditions), which prevents crosslinking reactions and promotes complete hydrolysis to high-quality liquid products
Solution Approach 2:
The invention converts the typically harmful crosslinking reaction into a beneficial pathway by using excess base to convert crosslinking intermediates into soluble products, transforming a source of low yield and poor quality into a route for complete conversion to high-quality liquid hydrocarbons
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 high conversion efficiency of biomass to liquid hydrocarbons and carbon dioxide, with complete conversion possible within a short time frame, using moderate temperatures and tolerating impurities like water, and can handle any type of biomass feedstock, including wet and whole-plant biomass.
Implementation Method 1
heating the reaction mixture to a reaction temperature to encourage a decarboxylation reaction via, e.g. alcoholysis and/or hydrolysis of the biomass feedstock. The base is included in the reaction mixture in an amount such that the reaction mixture is maintained at a pH of about 11 or greater over the course of the reaction. During the reaction, the excess base can function as a catalyst for the decarboxylation reaction
Implementation Method 2
encourage a decarboxylation reaction via, e.g. alcoholysis and/or hydrolysis of the biomass feedstock
Implementation Method 3
encourage a decarboxylation reaction via, e.g. alcoholysis and/or hydrolysis of the biomass feedstock
Implementation Method 4
the excess base can function as a catalyst for the decarboxylation reaction and also as a reactant for reaction with carbon dioxide created in the alcoholysis/hydrolysis reaction
Implementation Method 5
heating the reaction mixture to a reaction temperature to encourage a decarboxylation reaction
Implementation Method 6
the reaction mixture can be maintained under sufficient pressure over the course of decarboxylation reaction such that the reaction mixture is not completely vaporized
Data Source
AI summary
Highly efficient and universal biomass conversion methods are described. Methods utilize a base-catalyzed decarboxylation reaction in a conversion process carried out in the presence of excess base to overcome carbonate formation from CO2. Methods can efficiently convert all components of a biomass feedstock to liquid hydrocarbons and carbon dioxide byproduct. The process has several versions: hydrolysis and alcoholysis, etc. The chemical process can be carried out with nearly 100% conversion for any type of biomass feedstock and requires no expensive or complicated pretreatment. The conversion reactions can be carried out at moderate temperatures of 170-300° C. and form a product that can include a mixture of hydrocarbons and oxygenated hydrocarbons, including alcohols and phenol derivatives.