Desulfurization Process Optimizing Sulfur Removal and Octane Retention
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Solution Overview
Problem
Conventional desulfurization processes for hydrocarbon-containing fluids, such as cracked-gasoline, often result in significant octane loss due to the saturation of olefins and aromatics, which is undesirable for maintaining fuel efficiency and reducing emissions.
Innovation Solution
A desulfurization process involving a sorbent system where the hydrogen-to-hydrocarbon molar ratio is less than 0.7, with specific pressure and temperature conditions, and the use of a zinc oxide-based sorbent composition, allows for efficient sulfur removal while minimizing octane loss by maintaining a constant hydrogen partial pressure and adjusting operating parameters to optimize sulfur conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional hydrodesulfurization processes are used to remove sulfur from cracked-gasoline, then sulfur removal is achieved, but octane number is reduced due to saturation of olefins and aromatics
Solution Approach 1:
The invention changes the operating parameters from conventional hydrodesulfurization conditions (high hydrogen partial pressure, high temperature) to specific conditions with hydrogen partial pressure between 1-50 psig and temperature between 700-900°F. This parameter change allows sulfur removal while minimizing olefin and aromatic saturation, thus preserving octane number
Solution Approach 2:
The invention uses a copy or alternative approach to conventional hydrodesulfurization by employing a fixed-bed sorbent process that mimics the sulfur removal function but through different chemical mechanisms (sorption rather than hydrogenation), thereby achieving desulfurization without the harmful side effect of octane loss
2Productivity
If hydrogen partial pressure is increased to enhance sulfur removal, then desulfurization efficiency improves, but octane loss increases due to excessive saturation of hydrocarbons
Solution Approach 1:
The invention optimizes the hydrogen partial pressure parameter to a specific range (1-50 psig) that is sufficient for sulfur removal but low enough to prevent excessive saturation of olefins and aromatics. This precise parameter control achieves the balance between desulfurization efficiency and octane preservation
Solution Approach 2:
The invention implements dynamic control of operating parameters including hydrogen partial pressure, temperature, and space velocity to adapt to different feed compositions and achieve optimal desulfurization while minimizing octane loss. The process can adjust parameters in real-time to maintain the balance between sulfur removal and octane preservation
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
This approach effectively reduces sulfur content in hydrocarbon streams while preserving or even enhancing octane levels, thereby improving fuel quality and reducing emissions without significant octane loss.
Implementation Method 1
contacting a feed stream with a sorbent in a desulfurization zone under desulfurization conditions sufficient to transfer sulfur from the feed stream to the sorbent
Implementation Method 2
contacting at least a portion of the sorbent with an oxygen-containing regeneration stream in a regeneration zone
Implementation Method 3
contacting at least a portion of the sorbent with a hydrogen-containing reducing stream in a reducing zone
Data Source
AI summary
A desulfurization system is operated in a manner which optimizes sulfur removal and octane retention. When the desulfurization reactor is operated at a specific ratio of total pressure to hydrogen partial pressure (PT/PH) and/or within a specific temperature range, optimum sulfur removal and octane retention are realized. The desulfurization reactor can be maintained at these optimized operating conditions by automatically adjusting one or more operating parameters of the desulfurization reactor in order to maintain a substantially constant hydrogen partial pressure (PH) in the reactor. Maintaining a relatively constant hydrogen partial pressure (PH) in the desulfurization reactor helps ensure a relatively consistent degree of desulfurization.