Lignin-Derived Heat Transfer Fluids for High-Temperature Stability
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Solution Overview
Problem
Current heat transfer fluids derived from petroleum lack thermal stability and high heat capacity, necessitating expensive heat exchange networks in industrial applications like concentrating solar power plants.
Innovation Solution
Development of lignin-derived dimer and oligomer compounds, such as dimers, trimers, and tetramers, which are produced through lignin depolymerization and further modified via catalytic hydrodeoxygenation, offering superior thermophysical properties including high thermal stability and low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-derived heat transfer fluids are used, then they provide adequate heat transfer capability, but they lack thermal stability and high heat capacity
Solution Approach 1:
The patent changes the chemical composition parameters by using lignin-derived compounds with specific molecular weight distributions (200-750 Da) and chemical structures (dimers, trimers, tetramers) to achieve superior thermal stability and heat capacity compared to conventional petroleum-derived fluids
Solution Approach 2:
The patent employs composite lignin-derived compounds containing multiple aromatic rings and specific linkages (β-O-4, 5-5, β-5) that combine thermal stability with high heat capacity, creating a material that simultaneously improves both reliability and energy storage capability
2Temperature
If conventional heat transfer fluids are used, then the system operates at lower temperatures, but expensive heat exchange networks are required to achieve high temperature operation
Solution Approach 1:
The patent changes the thermal stability parameter of the heat transfer fluid by using lignin-derived compounds stable up to 300°C, enabling direct operation at high temperatures without requiring complex heat exchange networks or thermal reservoirs
3Reliability
If lignin-derived compounds with high molecular weight are used, then thermal stability improves, but viscosity increases
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific range (200-750 Da) and controls the degree of polymerization to produce compounds that are tetramers or lower, achieving thermal stability while maintaining low viscosity for easy pumping and operation
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 lignin-derived compounds provide heat transfer fluids with enhanced thermal stability up to 260-300°C, high heat capacity, and low viscosity, reducing the need for expensive thermal reservoirs and improving efficiency in industrial applications.
Implementation Method 1
contacting a first oil with a solvent to create a mixture that includes a light phase and a heavy phase, where the solvent includes an oxygen-containing hydrocarbon, the first oil includes a lignin-derived compound including at least one of a dimer, a trimer, and/or a tetramer, and the contacting transfers at least a portion of the lignin-derived compound from the first oil to the light phase
Implementation Method 2
distilling the second oil resulting in the forming of a lower molecular weight (MW) stream that includes the lignin-derived compound and a higher MW stream
Implementation Method 3
evaporating at least a portion of the solvent to form a vapor, condensing at least a portion of the vapor to form a condensate, and returning the condensate to the mixture
Data Source
AI summary
The present disclosure relates to a composition that includes a lignin-derived mixture that includes at least one of a dimer, a trimer, and/or a tetramer, where the composition is characterized by a thermal stability up to a maximum temperature between about 260° C. and about 300° C.