Gasoline Fractionation and Mixed Catalyst Desulfurization
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Solution Overview
Problem
Current methods for deep desulfurization of gasoline, such as hydrodesulfurization and adsorption desulfurization, often result in a significant loss of octane number due to olefin saturation, and existing processes require multiple steps and catalyst modifications, which are costly and inefficient.
Innovation Solution
A process involving the splitting of gasoline feedstock into light and heavy fractions, where the light fraction is etherified and the heavy fraction is subjected to desulfurization and aromatization using a mixed catalyst comprising an adsorption desulfurization catalyst and an aromatization catalyst, with the aromatization catalyst being passivated and/or aged to enhance activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydrodesulfurization or adsorption desulfurization is used for deep desulfurization of gasoline, then sulfur content is reduced, but olefin saturation occurs resulting in significant loss of octane number
Solution Approach 1:
The gasoline feedstock is divided into light gasoline fraction and heavy gasoline fraction through fractionation. The heavy gasoline fraction containing sulfur compounds is selectively treated for desulfurization, while the light gasoline fraction rich in high-octane olefins is preserved, thus achieving deep desulfurization without significant octane number loss
Solution Approach 2:
Different treatment approaches are applied to different fractions: the heavy gasoline fraction undergoes hydrodesulfurization to remove sulfur, while the light gasoline fraction is retained to preserve high-octane olefin components. This localized quality control ensures both low sulfur content and high octane number in the final product
2Object-generated harmful factors
If a second reactor is added for deep hydrogenation to restore octane number after desulfurization, then octane number is improved, but device complexity and process cost increase
Solution Approach 1:
The sulfur-containing heavy gasoline fraction is extracted and separated from the high-octane light gasoline fraction. By treating only the heavy fraction for desulfurization and preserving the light fraction, the need for additional hydrogenation reactors to restore octane number is eliminated, simplifying the overall process
Solution Approach 2:
Instead of treating the entire gasoline stream for desulfurization and then adding another reactor to restore octane, the invention inverts the approach by selectively treating only the sulfur-containing heavy fraction, thereby achieving both desulfurization and octane preservation in a single process step
3Productivity
If adsorption desulfurization is carried out in the presence of hydrogen, then desulfurization efficiency is improved, but olefin saturation occurs resulting in octane number loss
Solution Approach 1:
The gasoline is segmented into light and heavy fractions. The heavy fraction is subjected to hydrodesulfurization in the presence of hydrogen to achieve high desulfurization efficiency, while the light fraction containing valuable olefins is preserved, thus avoiding octane number loss that would occur if the entire stream were treated with adsorption desulfurization in hydrogen
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 and olefin content while maintaining or increasing the octane number of gasoline, improving reaction efficiency and reducing costs by eliminating the need for separate reactors and catalyst modifications.
Implementation Method 1
contacting the resulting heavy gasoline fraction with a mixed catalyst and subjecting it to desulfurization and aromatization in the presence of hydrogen
Implementation Method 2
the mixed catalyst comprises an adsorption desulfurization catalyst and an aromatization catalyst
Implementation Method 3
subjecting it to desulfurization and aromatization in the presence of hydrogen to obtain a heavy gasoline product
Implementation Method 4
the aromatization catalyst being passivated and/or aged to enhance activity
Data Source
AI summary
The present application relates to a process for treating gasoline, comprising the steps of: splitting a gasoline feedstock into a light gasoline fraction and a heavy gasoline fraction; optionally, subjecting the resulting light gasoline fraction to etherification to obtain an etherified oil; contacting the heavy gasoline fraction with a mixed catalyst and subjecting it to desulfurization and aromatization in the presence of hydrogen to obtain a heavy gasoline product; wherein the mixed catalyst comprises an adsorption desulfurization catalyst and an aromatization catalyst. The process of the present application is capable of reducing the sulfur and olefin content of gasoline and at the same time increasing the octane number of the gasoline while maintaining a high yield of gasoline.