Pyrolysis Oil Upgrading via Polar Solvent Extraction
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Solution Overview
Problem
Existing pyrolysis oils derived from plastic and rubber have high olefin content, solid residue, and heteroatom content, which make them unsuitable for direct use as transportation fuel due to instability, blockage risks, and emission concerns, requiring costly filtration and hydrogenation processes.
Innovation Solution
A process using a polar organic solvent to separate pyrolysis oil into an extract phase and a raffinate phase, reducing olefin and heteroatom content, and enhancing stability through a solvent extraction method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filtration or centrifugation is used to remove solid residue from pyrolysis oil, then the quality of fuel improves, but capital and operation costs significantly increase
Solution Approach 1:
The patent uses extraction with a polar organic solvent to remove unwanted components (solid residues, heteroatoms, and olefins) from pyrolysis oil. The solvent selectively dissolves these impurities, forming a separate phase that can be easily decanted or filtered, leaving purified oil without requiring complex high-pressure filtration or centrifugation systems.
Solution Approach 2:
The polar organic solvent acts as an intermediary substance that facilitates the separation of impurities from pyrolysis oil. The solvent temporarily binds to unwanted components through solvation, enabling their removal via simple phase separation, thereby avoiding direct mechanical separation challenges.
2Stability of the object's composition
If hydrogenation is used to reduce olefin content, then stability of pyrolysis oil improves, but capital and operation costs heavily increase
Solution Approach 1:
The patent extracts olefins from pyrolysis oil using a polar organic solvent. The solvent selectively solvates olefinic compounds due to their polarizable double bonds, allowing their removal through phase separation. This avoids the need for hydrogenation reactors, catalysts, and high-pressure hydrogen supply systems.
Solution Approach 2:
The patent replaces the chemical hydrogenation process with a physical-chemical extraction process. Instead of using catalysts and high-pressure hydrogen to saturate olefins, the method uses solvent-solute interactions to selectively remove olefins, substituting a simpler liquid-liquid extraction system for complex catalytic hydrogenation equipment.
3Reliability
If conventional upgrading processes are used to remove solid residue and heteroatoms, then fuel quality improves, but the processes significantly increase capital and operation cost
Solution Approach 1:
The polar organic solvent performs multiple functions simultaneously: it removes solid residues through solvation, extracts heteroatom-containing compounds via polar interactions, and eliminates olefins through selective solubility. This single-step multi-functional extraction replaces multiple separate treatment processes, reducing both capital investment and operational expenses.
Solution Approach 2:
The patent changes the chemical parameter of the treatment medium from non-polar conventional solvents to polar organic solvents. This parameter change enables selective interaction with polar impurities (heteroatoms, oxygenates) and olefins, achieving comprehensive purification in one step with lower cost compared to multiple conventional treatment stages.
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 effectively reduces olefin and heteroatom content, stabilizes the pyrolysis oil, and produces a higher-quality fuel suitable for transportation use, reducing capital and operational costs.
Implementation Method 1
treating the pyrolysis oil with an upgrading solution to provide a mixture comprising an extract phase and a raffinate phase, wherein the upgrading solution comprises a polar organic solvent
Data Source
AI summary
A process for upgrading a pyrolysis oil comprising treating the pyrolysis oil with an upgrading solution to provide a mixture comprising an extract phase and a raffinate phase, wherein the upgrading solution comprises a polar organic solvent, and wherein the pyrolysis oil is a derived from the pyrolysis of plastic or rubber, or a combination thereof, and an upgraded pyrolysis oil prepared by said process.