Supercritical CO2 Thermochemical Conversion of Biomass
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Solution Overview
Problem
Hydrothermal liquefaction processes for converting biomass to bio-oils face challenges such as energy-intensive separation of bio-oil from water, leading to potential pollution and inefficiencies due to the solubility of water-soluble organic compounds in the aqueous phase.
Innovation Solution
A thermochemical conversion system utilizing a supercritical fluid, like supercritical carbon dioxide, to transfer thermal energy from a heat source to a carbonaceous feedstock, facilitating thermal decomposition and reducing the need for fine particle conversion, while controlling reaction conditions to enhance the recovery of bio-oil with reduced water content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrothermal liquefaction is used to convert biomass to bio-oil, then bio-oil production is achieved, but energy-intensive separation processes are required and water-soluble organic compounds are lost in the aqueous phase
Solution Approach 1:
The patent changes the physical-chemical parameters of the reaction medium from aqueous (hydrothermal) to supercritical carbon dioxide environment. This parameter change fundamentally alters the solubility characteristics, allowing bio-oil products to remain soluble in the supercritical phase while water-soluble compounds can be selectively removed, eliminating the need for energy-intensive distillation separation processes
Solution Approach 2:
The patent utilizes the phase transition properties of carbon dioxide between supercritical and gaseous states. By controlling pressure and temperature, CO2 transitions to a supercritical state during reaction, then returns to gaseous state for easy separation from products. This phase transition enables simple separation without energy-intensive distillation, directly addressing the energy consumption problem
2Productivity
If hydrothermal liquefaction is used to convert biomass to bio-oil, then bio-oil production is achieved, but water-soluble organic compounds are lost in the aqueous phase contributing to pollution
Solution Approach 1:
The patent changes the reaction medium from water to supercritical carbon dioxide. This parameter change exploits the non-polar nature of supercritical CO2, which does not dissolve water-soluble organic compounds. These compounds can be selectively removed from the feedstock before reaction or separated from the reaction products, preventing their loss and potential pollution while maintaining high bio-oil production
3Power
If conventional heat transfer methods are used in thermochemical conversion, then thermal energy is transferred to feedstock, but fine particle conversion is required which increases process complexity
Solution Approach 1:
The patent uses supercritical carbon dioxide as an intermediary heat transfer medium between the heat source and the biomass feedstock. This intermediary enables efficient thermal energy transfer through the unique properties of supercritical fluids (high density, low viscosity, high thermal conductivity) without requiring the feedstock to be ground into fine particles, thereby simplifying the overall process while maintaining high heating efficiency
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 approach improves the efficiency of bio-oil production by reducing energy consumption in separation processes and minimizing water-soluble organic compound loss, thereby enhancing the overall process sustainability and product yield.
Implementation Method 1
transferring at least a portion of the generated thermal energy from the volume of supercritical fluid to the volume of feedstock
Implementation Method 2
performing a thermal decomposition process on the volume of feedstock with the thermal energy transferred from the volume of supercritical fluid to the volume of the feedstock
Implementation Method 3
transferring a portion of the generated thermal energy to the volume of supercritical fluid
Data Source
AI summary
The thermochemical conversion of biomass material to one or more reaction products includes generating thermal energy with at least one heat source, providing a volume of feedstock, providing a volume of supercritical fluid, transferring a portion of the generated thermal energy to the volume of supercritical fluid, transferring at least a portion of the generated thermal energy from the volume of supercritical fluid to the volume of feedstock, and performing a thermal decomposition process on the volume of feedstock with the thermal energy transferred from the volume of supercritical fluid to the volume of the feedstock in order to form at least one reaction product.