Biomass Pyrolysis Oil Deoxygenation via Phenolic Dilution
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Solution Overview
Problem
Biomass-derived pyrolysis oil is limited by its high oxygen content, leading to rapid plugging and fouling of catalysts in hydroprocessing reactors due to thermal or acid-catalyzed polymerization, which reduces the run duration and processability of the oil.
Innovation Solution
Diluting biomass-derived pyrolysis oil with a phenolic-containing diluent and contacting it with a deoxygenating catalyst in the presence of hydrogen at hydroprocessing conditions to produce a low-oxygen biomass-derived pyrolysis oil, thereby reducing the formation of glassy brown polymers or powdery brown char on the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If biomass-derived pyrolysis oil is directly processed through catalytic deoxygenation, then oxygen content is reduced, but catalyst plugging and fouling occur due to polymerization reactions
Solution Approach 1:
The patent applies preliminary action by performing dilution of the pyrolysis oil with phenolic diluent before the catalytic deoxygenation step. This pre-treatment modifies the feed composition to prevent polymerization reactions during subsequent processing, thereby avoiding catalyst plugging while enabling effective oxygen removal through hydroprocessing
Solution Approach 2:
The patent uses phenolic diluent as an intermediary substance that mediates between the pyrolysis oil and the catalyst. The diluent acts as a protective medium that prevents direct contact between polymerizing oil components and the catalyst surface, thereby preventing fouling while allowing the deoxygenation reaction to proceed in the bulk phase
2Quantity of substance
If deoxygenation is performed to reduce oxygen content, then oxygenated hydrocarbons are removed, but secondary polymerization reactions increase forming glassy brown polymer or powdery brown char
Solution Approach 1:
The patent applies parameter changes by modifying the composition parameters of the feed stream through dilution with phenolic diluent. This changes the concentration parameters of oxygenated hydrocarbons and introduces phenolic compounds that suppress polymerization, thereby enabling deoxygenation without excessive polymer formation
Solution Approach 2:
The patent converts the harmful effect of oxygenated hydrocarbons (which cause polymerization) into a beneficial process by using phenolic diluent to facilitate controlled deoxygenation. The diluent transforms the problematic secondary polymerization into a controlled hydroprocessing reaction that removes oxygen as water while minimizing unwanted polymer formation
3Duration of action of stationary object
If run duration is extended by preventing catalyst plugging, then processability is improved, but requires additional diluent and processing steps
Solution Approach 1:
The patent applies universality by using phenolic diluent that serves multiple functions simultaneously: it dilutes the pyrolysis oil to reduce polymerization tendency, acts as a protective medium for the catalyst, and participates in the hydroprocessing reaction. This multi-functionality extends run duration without requiring separate pretreatment and protection steps
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 effectively minimizes catalyst plugging and extends run duration, improving the processability of biomass-derived pyrolysis oil by reducing secondary polymerization reactions and maintaining a low oxygen concentration in the oil.
Implementation Method 1
contacting it with a deoxygenating catalyst in the presence of hydrogen at hydroprocessing conditions
Implementation Method 2
contacting it with a deoxygenating catalyst in the presence of hydrogen
Data Source
AI summary
Methods for deoxygenating a biomass-derived pyrolysis oil are provided. A method comprising the steps of diluting the biomass-derived pyrolysis oil with a phenolic-containing diluent to form a diluted pyoil-phenolic feed is provided. The diluted pyoil-phenolic feed is contacted with a deoxygenating catalyst in the presence of hydrogen at hydroprocessing conditions effective to form a low-oxygen biomass-derived pyrolysis oil effluent.