Hydrodesulfurization and Aromatic Extraction for High Octane Low Sulfur Fuel
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Solution Overview
Problem
Current processes for reducing sulfur content in hydrocarbon fractions, such as catalytic cracking gasoline, often result in a significant drop in octane number, failing to meet stringent sulfur specifications and increasing demand for high-quality gasoline while facing rising raw material costs.
Innovation Solution
A process involving hydrodesulfurization and selective hydrogenation stages, followed by extraction of aromatic compounds, which allows for the production of a hydrocarbon fraction with a high octane number and low sulfur content, enabling compliance with sulfur specifications and conversion into valuable petrochemical feedstocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrodesulfurization is carried out to reduce sulfur content, then sulfur content is reduced, but octane number drops significantly
Solution Approach 1:
The process divides the hydrocarbon fraction into multiple fractions based on boiling point ranges, treating each fraction separately through selective hydrogenation and hydrodesulfurization. This segmentation allows different fractions to be processed under optimized conditions, preserving octane number while reducing sulfur content.
Solution Approach 2:
The patent applies selective hydrogenation to specific fractions containing olefins and diolefins, while applying hydrodesulfurization to other fractions. This local quality approach treats different components differently based on their chemical composition, reducing sulfur without uniformly degrading octane number across all fractions.
2Quantity of substance
If conventional desulfurization processes are used to meet sulfur specifications, then sulfur content is reduced, but octane number is degraded
Solution Approach 1:
The process changes the chemical parameters of the hydrocarbon fraction by selectively hydrogenating olefins and diolefins to saturated compounds, then applying hydrodesulfurization under controlled conditions. This parameter change approach transforms the chemical composition to achieve low sulfur content while maintaining high octane number through selective saturation.
3Quantity of substance
If the entire hydrocarbon fraction is treated to reduce sulfur, then sulfur content is reduced, but the quality and quantity of gasoline pool is compromised
Solution Approach 1:
The hydrocarbon fraction is segmented into multiple boiling point ranges, with each fraction treated selectively. This allows the gasoline pool fraction to be processed to meet sulfur specifications while preserving the quality and quantity needed for the gasoline pool, as other fractions can be directed to different uses.
Solution Approach 2:
Selective treatment is applied to specific fractions that require desulfurization, while other fractions are preserved for the gasoline pool. This local quality approach ensures that sulfur reduction is achieved where needed without compromising the overall quality and quantity of gasoline pool products.
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 to very low levels while maintaining or increasing the octane number, enhancing the quality and quantity of hydrocarbon products, and optimizing the use of raw materials.
Implementation Method 1
A stage for hydrodesulfurization of the hydrocarbon feedstock
Implementation Method 2
At least one stage for extraction of aromatic compounds over all or part of the effluent that is obtained from the hydrodesulfurization stage
Data Source
AI summary
Process for the production of a hydrocarbon fraction with a high octane number and a low sulfur content from a hydrocarbon feedstock, comprising at least the following stages:1) a hydrodesulfurization stage of the hydrocarbon feedstock, and2) at least one stage for extracting aromatic compounds on all or part of the effluent that is obtained from the hydrodesulfurization stage, whereby said extraction leads to a paraffin-enriched raffinate and an aromatic compound-enriched extract sent to a gasoline pool to improve its octane number, wherein a portion of the paraffinic raffinate can be used in a mixture with the aromatic extract; another portion can be used as a petrochemistry base either for producing aromatic compounds or for producing olefins.