Desulfurization Adsorbent Composition for Cracking Fuel
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Solution Overview
Problem
Current adsorbents for desulfurizing cracking gasoline or diesel fuel face challenges in maintaining high desulfurization activity and abrasion resistance, leading to reduced effectiveness and increased costs due to hydrogen consumption and structural collapse during the adsorption process.
Innovation Solution
A novel adsorbent composition comprising specific weight percentages of alumina, silica, metal oxides from Groups IIB and VB, metal accelerants from Groups VIIB and VIII, and alkaline metal oxides, prepared through a process involving mixing, molding, drying, calcination, and reduction, which enhances abrasion resistance and desulfurization performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrogenation reaction is used to remove thiophene compounds, then sulfur content is reduced, but olefin content decreases and octane number is reduced
Solution Approach 1:
The patent extracts the harmful sulfur compounds from the fuel mixture through selective adsorption on the desulfurization adsorbent, separating the desulfurization function from the hydrogenation process. This allows sulfur removal without the negative side effects of hydrogenation on olefin content and octane number.
Solution Approach 2:
The patent introduces a desulfurization adsorbent as an intermediary substance that mediates the desulfurization process. This adsorbent selectively absorbs sulfur compounds from the fuel, providing an alternative pathway that avoids direct hydrogenation and its associated drawbacks.
2Quantity of substance
If hydrodesulfurization is used to remove sulfur, then sulfur content is reduced, but hydrogen consumption increases
Solution Approach 1:
The patent replaces the chemical hydrogenation mechanism with a physical adsorption mechanism. Instead of using hydrogen gas to chemically reduce sulfur compounds, the system uses an adsorbent material that physically absorbs sulfur compounds from the fuel, eliminating hydrogen consumption.
Solution Approach 2:
The patent employs a consumable adsorbent material that can be regenerated and reused. This replaces the need for continuous hydrogen supply, providing a more economical desulfurization process where the adsorbent is replenished rather than consumed.
3Device complexity
If fixed-bed process is used for desulfurization, then process simplicity is maintained, but reaction homogeneity and regeneration performance are inferior
Solution Approach 1:
The patent transitions from a static fixed-bed configuration to a dynamic fluidized-bed system. The fluidized state creates continuous motion and mixing of the adsorbent particles with the fuel stream, achieving superior contact homogeneity and regeneration performance while maintaining operational simplicity.
4Temperature
If granular reactants are used in fluidized-bed reactor, then heat transfer and pressure drop performance are improved, but abrasion resistance is insufficient
Solution Approach 1:
The patent creates a composite adsorbent material combining multiple components with complementary properties. The formulation includes binders and structural additives that provide mechanical strength and abrasion resistance while maintaining the porous structure needed for effective sulfur adsorption and fluidized-bed performance.
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 adsorbent achieves high desulfurization activity with improved abrasion resistance, reducing the need for hydrogen consumption and extending the adsorbent's lifespan, while maintaining the octane number and aromatic hydrocarbons in the fuel, thus meeting stringent environmental standards.
Implementation Method 1
an adsorbent composition which is suitable for desulfurizing cracking gasoline or diesel fuel
Implementation Method 2
metal accelerants from Groups VIIB and VIII
Data Source
AI summary
The present invention provides an adsorbent for removing sulfur from cracking gasoline or diesel fuel. The adsorbent has excellent abrasion-resistance and desulfurization activity. The adsorbent comprises from about 5 to about 35 wt % of alumina, from about 3 to about 30 wt % of silica, from about 10 to about 80 wt % of at least one oxide of metal selected from Groups IIB and VB, from about 3 to about 30 wt % of at least one metal accelerant selected from Groups VIIB and VIII, and from about 0.5 to about 10 wt % of at least one oxide of metal selected from Groups IA and IIA, based on the total weight of the adsorbent.