Oxidative Desulfurization Catalyst for Ultra-Low Sulfur Fuels
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Solution Overview
Problem
Current methods for desulfurizing hydrocarbon fuels to ultra-low sulfur levels are costly and inefficient, particularly in removing refractory sulfur-containing compounds, which are difficult to desulfurize using conventional hydrodesulfurization techniques, and existing processes often require significant capital investment and operational changes.
Innovation Solution
A process using a catalyst composed of copper, zinc, and aluminum oxides, in specific weight percentages, that facilitates oxidative and/or adsorptive desulfurization of sulfur compounds in the gaseous phase, oxidizing sulfur compounds to SO2 or converting them into sulfates, sulfites, and sulfides, allowing for the efficient removal of both labile and refractory sulfur compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrodesulfurization techniques are used, then existing facilities can be operated, but sulfur removal efficiency is insufficient for ultra-low sulfur levels
Solution Approach 1:
The patent changes the chemical reaction parameters by introducing oxidation reactions alongside hydrodesulfurization. The oxidative desulfurization pathway converts sulfur compounds to sulfones and sulfonic acids, which are then removed by extraction, achieving ultra-low sulfur levels (below 10 ppmw) that conventional hydrodesulfurization cannot attain alone.
Solution Approach 2:
The patent employs a composite approach combining two different chemical processes: hydrodesulfurization (catalytic hydrogenation) and oxidative desulfurization (oxidation reaction). This composite methodology leverages the strengths of both processes to achieve complete desulfurization, with the oxidation step targeting refractory sulfur compounds that resist conventional hydrodesulfurization.
2Manufacturing precision
If high pressure hydrotreating units are constructed, then ultra-low sulfur levels can be achieved, but capital investment costs increase significantly
Solution Approach 1:
The patent segments the desulfurization process into two distinct stages: a first stage using existing hydrodesulfurization facilities at moderate conditions, and a second stage using oxidative desulfurization. This segmentation allows refiners to achieve ultra-low sulfur levels without completely replacing existing high-pressure hydrotreating infrastructure, thereby reducing capital investment while meeting stringent sulfur specifications.
Solution Approach 2:
The oxidative desulfurization process performs preliminary oxidation of sulfur compounds before final removal via extraction. This preliminary action converts difficult-to-remove sulfur compounds into more extractable forms, enabling effective desulfurization at lower pressures and temperatures, thus avoiding the need for expensive high-pressure facility construction.
3Manufacturing precision
If existing hydrotreating facilities are upgraded, then sulfur reduction capability improves, but operational complexity and costs increase
Solution Approach 1:
The patent introduces an intermediary extraction step that uses selective solvents to remove oxidized sulfur compounds from the hydrocarbon stream. This intermediary process acts as a bridge between hydrodesulfurization and final product specification, enabling existing facilities to achieve ultra-low sulfur levels without complex mechanical retrofits or infrastructure changes.
Solution Approach 2:
The patent replaces the need for complex mechanical upgrades (higher pressure vessels, enhanced reactors) with a chemical process substitution. By using oxidative desulfurization followed by liquid-liquid extraction, the system achieves equivalent or superior sulfur removal without modifying the mechanical infrastructure of existing hydrotreating facilities.
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 effectively reduces sulfur content in hydrocarbon fuels to ultra-low levels, achieving high sulfur removal efficiency while minimizing capital and operational costs, and the catalyst can be regenerated to maintain performance.
Implementation Method 1
oxidizing sulfur compounds to SO2
Implementation Method 2
converting them into sulfates, sulfites, and sulfides
Data Source
Figure 1~2
AI summary
A catalytic composition is disclosed, which exhibits an X-ray amorphous oxide, with a spinel formula and highly dispersed crystals of ZnO, CuO, and optionally CeO2. The composition is useful in oxidative and adsorptive processes for removing sulfur from gaseous hydrocarbons.