Biomass Hydropyrolysis and Hydroconversion for Liquid Fuel
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Solution Overview
Problem
Conventional biomass pyrolysis processes produce bio-oils with high chemical reactivity, water miscibility, and low heating value, making it difficult to upgrade them into fungible liquid hydrocarbon fuels that meet the specifications for diesel and gasoline range products.
Innovation Solution
A process involving hydropyrolysis of biomass with a catalyst composition at controlled temperatures and pressures, followed by char removal and hydroconversion to deoxygenate and saturate hydrocarbons, producing a product with reduced aromatic content and improved quality for blending with conventional fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional pyrolysis is used to convert biomass into liquid fuel, then the process is simple and direct, but the product has high chemical reactivity, water miscibility, and low heating value making it difficult to upgrade
Solution Approach 1:
The conversion process is divided into two distinct stages: hydropyrolysis followed by hydroconversion. The hydropyrolysis stage produces deoxygenated hydrocarbons, while the hydroconversion stage further processes these to achieve desired fuel specifications. This segmentation allows each stage to be optimized independently, resolving the contradiction between process simplicity and product quality.
Solution Approach 2:
Molecular hydrogen is introduced as an intermediary substance during hydropyrolysis to facilitate deoxygenation of the biomass-derived liquids. This intermediary enables the transformation of high-oxygen bio-oil into low-oxygen hydrocarbons, significantly improving heating value and reducing water miscibility while maintaining process feasibility.
2Reliability
If hydropyrolysis with catalysts is used to improve product quality, then deoxygenation is achieved, but aromatic content increases which may affect fuel specifications
Solution Approach 1:
The hydroconversion stage operates under dynamically adjustable conditions (temperature, pressure, catalyst type) to control the degree of aromatic saturation. By optimizing these parameters, the process achieves desired balance between deoxygenation efficiency and aromatic content control, allowing production of both gasoline-range and diesel-range hydrocarbons with appropriate specifications.
Solution Approach 2:
Different catalyst compositions and reaction conditions are applied in the hydroconversion stage to control product distribution. By changing parameters such as catalyst metal content, temperature, and pressure, the process can selectively produce saturated or unsaturated hydrocarbons, adjusting aromatic content to meet target fuel specifications while maintaining deoxygenation benefits.
3Use of energy by moving object
If high deoxygenation is achieved through hydropyrolysis, then heating value improves, but process complexity and catalyst requirements increase
Solution Approach 1:
The hydropyrolysis process generates molecular hydrogen in situ from the biomass feedstock itself, which then serves as the hydrogen source for deoxygenation reactions. This self-service approach eliminates the need for external hydrogen supply infrastructure, reducing process complexity while achieving high deoxygenation levels and improved heating value.
Solution Approach 2:
The same hydropyrolysis reactor and catalyst system perform multiple functions: cracking biomass polymers, removing oxygen as water and carbon monoxide, and generating hydrogen for further deoxygenation. This multi-functionality reduces the number of separate units required, simplifying the overall process while achieving high deoxygenation efficiency.
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 achieves fully deoxygenated hydrocarbon products with low aromatic content, suitable for high percentage blending with existing gasoline and diesel fuels without affecting quality or performance, thereby addressing the limitations of conventional biomass conversion methods.
Implementation Method 1
contacting the biomass-containing feedstock and/or biomass-derived feedstock with a hydropyrolysis catalyst composition in a hydropyrolysis reactor vessel to produce a product stream comprising a deoxygenated hydrocarbon product
Implementation Method 2
A process involving hydropyrolysis of biomass with a catalyst composition at controlled temperatures and pressures
Implementation Method 3
contacting the product stream with a hydroconversion catalyst composition in a hydroconversion reactor to produce a liquid hydrocarbon product
Implementation Method 4
hydroconversion to deoxygenate and saturate hydrocarbons, producing a product with reduced aromatic content
Data Source
AI summary
A process for producing liquid hydrocarbon products from a biomass-containing feedstock and/or a biomass-derived feedstock is provided. The process comprises:a) contacting the feedstock with a hydropyrolysis catalyst composition and molecular hydrogen in a hydropyrolysis reactor vessel to produce a product stream comprising a deoxygenated hydrocarbon product, H2O, H2, CO2, CO, C1-C3 gases, char and catalyst fines;b) removing char and catalyst fines from said product stream;c) cooling the remaining product stream to a temperature of no more than 300° C.; andd) hydroconverting all or a portion of said deoxygenated hydrocarbon product in a hydroconversion reactor in the presence of one or more catalyst compositions suitable for the aromatic saturation of the deoxygenated hydrocarbon product and of the H2O, CO2, CO, H2, and C1-C3 gas generated in step a), to produce a product comprising C4+ hydrocarbon product, H2O, CO, CO2, and C1-C3 gases.