Pyrolysis Vapor Upgrading via Segmented Catalytic Stabilization
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Solution Overview
Problem
Conventional fast pyrolysis of biomass produces highly reactive vapors that rapidly form high molecular weight compounds unsuitable for transportation fuels, and the char generated contains metals that poison upgrading catalysts, making it difficult to efficiently produce hydrocarbons within the desired molecular weight range for use as transportation fuels.
Innovation Solution
The process involves dividing pyrolysis vapors into portions, stabilizing one portion with catalysts to reduce reactivity, and then combining them with raw vapors at optimized temperature and pressure to produce hydrocarbons within the boiling range of gasoline, diesel, and gasoil, while preventing char contact with upgrading catalysts to extend catalyst lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fast pyrolysis is used to produce transportation fuel, then the process is simple and direct, but the vapors undergo uncontrolled polymerization to form high molecular weight compounds unsuitable for fuel
Solution Approach 1:
The pyrolysis vapor stream is divided into multiple portions, with at least one portion being stabilized by reaction with a catalyst before combining with the remaining raw vapors. This segmentation allows controlled stabilization of a fraction of the vapors to prevent uncontrolled polymerization while maintaining overall process feasibility
Solution Approach 2:
The invention changes the chemical reactivity parameter of the pyrolysis vapors by introducing catalysts that stabilize the vapors and reduce their tendency to polymerize. This parameter change enables control over molecular weight distribution while maintaining the fast pyrolysis process
2Reliability
If char is removed from pyrolysis vapors, then catalyst poisoning is prevented, but the separation process increases device complexity
Solution Approach 1:
The invention extracts and removes char from the pyrolysis vapor stream before the vapors contact the upgrading catalysts. This extraction prevents catalyst poisoning by metals in the char, thereby extending catalyst lifespan and maintaining reliability
Solution Approach 2:
The invention introduces an intermediary separation process or condensation step that allows char to be removed from the vapor stream. This intermediary mechanism protects the catalysts from direct contact with char while maintaining overall process efficiency
3Stability of the object's composition
If pyrolysis vapors are stabilized by reacting with catalysts, then uncontrolled polymerization is prevented, but the process requires additional catalysts and reaction zones
Solution Approach 1:
The vapor stream is segmented into portions, with at least one portion treated by catalysts in dedicated reaction zones. This segmentation allows stabilization to occur in controlled zones while maintaining overall process manageability
Solution Approach 2:
The invention performs preliminary stabilization of a portion of the pyrolysis vapors by reacting with catalysts before combining with raw vapors. This preliminary action prevents uncontrolled polymerization from occurring later in the process, ensuring vapor stability
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 effectively limits molecular growth to a suitable size range for transportation fuels, preventing uncontrolled polymerization and catalyst poisoning, thereby efficiently producing bio-derived hydrocarbons fungible with petroleum-derived fuels.
Implementation Method 1
stabilizing the first portion of bio derived pyrolysis vapors by reacting with at least one catalyst to produce stabilized pyrolysis vapors that are less active for oligomerization and polymerization
Implementation Method 2
fast pyrolysis of biomass. Conventional biomass fast pyrolysis requires rapid heating of biomass in the absence of oxygen
Implementation Method 3
combining the stabilized pyrolysis vapors with the second portion of biomass derived pyrolysis vapors at a temperature and pressure sufficient for molecules of the combined vapors to react and produce hydrocarbons
Data Source
AI summary
This disclosure relates to the fast pyrolysis of organic matter. More specifically, it relates to the catalytic modification of vapors created during the fast pyrolysis of organic matter to create transportation fuel or a transportation fuel component. At least a first portion of pyrolysis vapors is catalytically stabilized or converted, then combined with a portion of raw, unconverted bio-derived pyrolysis vapors at a temperature and pressure sufficient for molecules of the combined vapors to react and produce hydrocarbons of increased molecular weight that are suitable for use as a hydrocarbon transportation fuel or component thereof.