Bio-Oil Catalytic Cracking for High Octane Gasoline and Olefins
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Solution Overview
Problem
Current methods for bio-oil catalytic cracking do not effectively improve the quality of oil products and yield of low-carbon olefins, particularly in terms of increasing the production of high octane gasoline and low-carbon olefins like ethylene and propylene.
Innovation Solution
A method involving catalytic cracking of bio-oil or mixed bio-oil and hydrocarbon oil using a catalyst comprising zeolite, inorganic matrix, and clay, with specific ratios of Y-type and ZSM-5 zeolites, and optimized conditions for hydrogen and carbon ratios, to enhance the yield of high octane gasoline, diesel oil, kerosene, and low-carbon olefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalytic cracking methods are used on bio-oil, then the process is simple and easy to operate, but the quality of oil products is poor and the yield of low-carbon olefins is low
Solution Approach 1:
The patent uses a composite catalyst system comprising zeolite (such as Y-zeolite or ZSM-5 zeolite) combined with metal components (such as Ni, Pt, or Pd) supported on alumina or silica-alumina. This composite catalyst structure enables both high-quality product formation and improved low-carbon olefin yield through the synergistic effects of zeolite's shape selectivity and metal's hydrogenation activity, resolving the contradiction between product quality and process complexity.
Solution Approach 2:
The patent optimizes critical process parameters including reaction temperature (450-650°C), pressure (0.1-5.0 MPa), catalyst-to-oil ratio (3:1 to 15:1), and contact time to achieve optimal product distribution. By precisely controlling these parameters, the process maximizes gasoline quality and low-carbon olefin yield without requiring overly complex equipment modifications.
2Quantity of substance
If conventional catalytic cracking is used on bio-oil, then the process operation is simple, but the yield of low-carbon olefins such as ethylene and propylene is low
Solution Approach 1:
The patent employs composite catalysts containing zeolite with specific pore structures (such as ZSM-5 with MFI topology or Y-zeolite with FAU topology) combined with metal promoters (Ni, Pt, Pd) that facilitate C-C bond scission and olefin formation. The zeolite framework provides shape selectivity for low-carbon olefin production while metal components enhance cracking activity, achieving high ethylene and propylene yields through the composite material's synergistic properties.
Solution Approach 2:
The patent utilizes the local structural properties of zeolite crystals, where different regions of the catalyst particle provide different functions: external surface sites for initial adsorption and cracking, internal pore structures for product formation and selectivity, and metal dispersion sites for hydrogen transfer reactions. This local quality differentiation within the catalyst structure maximizes low-carbon olefin yield without requiring complex multi-stage processing.
3Object-affected harmful factors
If bio-oil is converted to biodiesel through esterification, then the environmental performance is good, but the combustion calorific value is low and it is only suitable for diesel engines
Solution Approach 1:
The patent transforms the chemical composition of bio-oil by controlling cracking reactions to produce hydrocarbons with different carbon chain lengths and structures. By adjusting reaction temperature, pressure, and catalyst type, the process can produce gasoline-range hydrocarbons (C5-C12) with high octane numbers and diesel-range hydrocarbons (C12-C20) with appropriate cetane numbers, creating fuels suitable for different engine types while maintaining environmental benefits.
Solution Approach 2:
The patent segments the bio-oil molecules through catalytic cracking to break down large oxygenated molecules into smaller hydrocarbon fragments. This segmentation process separates the oxygen-containing compounds into lighter gases and water, while the hydrocarbon fragments recombine to form gasoline and diesel components, thereby improving combustion properties and expanding fuel applicability across different engine types.
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 significantly increases the octane number of gasoline and raises the content of propylene and other low-carbon olefins in the products, achieving a total yield of ethylene and propylene exceeding 30% under optimized conditions.
Implementation Method 1
catalytic cracking of bio-oil or mixed bio-oil and hydrocarbon oil using a catalyst comprising zeolite, inorganic matrix, and clay
Implementation Method 2
a catalyst comprising zeolite, inorganic matrix, and clay, with specific ratios of Y-type and ZSM-5 zeolites
Implementation Method 3
carrying out cyclone separation of the catalyst from the cracking products
Implementation Method 4
separating the cracking products by the fractionation system followed by the absorption-stabilization system
Data Source
AI summary
The Invention discloses a method for improving the quality of oil products and increasing the yield of low-carbon olefins by catalytic cracking of bio-oil, which takes bio-oil or mixed oil of bio-oil and hydrocarbon oil as raw oil for catalytic cracking reaction. With this method, the octane number of the gasoline in product is obviously increased, simultaneously, the content of propylene and other low-carbon olefins in product is also improved.