Biomass Pyrolysis Oil Phase Stability via Reducing Gas Treatment
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Solution Overview
Problem
Biomass-derived pyrolysis oils produced through fast pyrolysis often become unstable, becoming more viscous and exhibiting phase separation, especially at elevated temperatures, which hinders their storage, shipment, and usage in projected applications.
Innovation Solution
Thermal treatment of biomass-derived pyrolysis oil under a reducing gas atmosphere at pressures greater than 101 kPa to 8274 kPa, heating it to a temperature of 40° C. to 85° C. for a period of time, to enhance phase stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If biomass-derived pyrolysis oil is produced through fast pyrolysis, then low viscosity and single-phase properties are achieved, but phase stability deteriorates at elevated temperatures
Solution Approach 1:
The patent applies parameter changes by treating the pyrolysis oil with a reducing gas at elevated temperatures (40-85°C) and pressures (1-1200 psig). This chemical treatment modifies the molecular composition of the oil, saturating double bonds and preventing oxidation, thereby improving phase stability at elevated temperatures while maintaining the low viscosity characteristics needed for fuel applications.
2Reliability
If pyrolysis oil is stored and transported, then utility is maintained, but viscosity increases and phase separation occurs
Solution Approach 1:
The patent implements preliminary action by stabilizing the pyrolysis oil through reducing gas treatment before storage and transportation. This pre-treatment saturates reactive double bonds and prevents subsequent oxidation and polymerization reactions that would cause viscosity increase and phase separation during storage, ensuring reliable performance throughout the supply chain.
3Stability of the object's composition
If reducing gas treatment is applied to stabilize pyrolysis oil, then phase stability improves, but process complexity increases
Solution Approach 1:
The patent uses a reducing gas (such as hydrogen, carbon monoxide, or natural gas) as an intermediary substance to stabilize the pyrolysis oil. The reducing gas reacts with and saturates the double bonds in the oil molecules, preventing oxidation and polymerization. This intermediary approach is simpler than alternative methods like adding chemical stabilizers or undergoing complex purification processes, making the technology more commercially viable.
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 method results in a biomass-derived pyrolysis oil with increased phase stability, maintaining low viscosity and single-phase consistency during storage and use at elevated temperatures.
Implementation Method 1
exposing biomass-derived pyrolysis oil to a reducing gas under pressure
Implementation Method 2
heating the biomass-derived pyrolysis oil to a temperature of about 40° C. to about 85° C.
Data Source
AI summary
A process for stabilizing pyrolysis oil has been developed. The process involves heating the pyrolysis oil at a temperature of about 40° C. to about 85° C. under a reducing atmosphere for a time to stabilize the oil. The reducing atmosphere or gas is preferably hydrogen.