Benzene Saturation in Isomerization Feedstreams
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Solution Overview
Problem
The challenge is to reduce benzene content in gasoline while maintaining high octane ratings, as existing isomerization and reforming processes face limitations due to benzene's high reactivity and the generation of undesirable side reactions, which decrease product yield and catalyst lifespan.
Innovation Solution
A process involving a hydrogenation zone upstream of the isomerization zone to saturate benzene, reducing its concentration and minimizing undesirable reactions, while using low-pressure feed driers and eliminating unnecessary equipment to conserve hydrogen and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If benzene-containing feedstocks are processed through conventional isomerization and reforming processes, then high octane gasoline can be produced, but benzene concentration increases and environmental regulations are violated
Solution Approach 1:
The patent applies preliminary action by implementing a hydrodesulfurization unit upstream of the isomerization unit. This预处理 removes sulfur compounds from the feedstock before isomerization, preventing sulfur from poisoning the isomerization catalyst and extending its lifespan while maintaining high octane production
2Productivity
If conventional isomerization processes are used without preliminary sulfur removal, then isomerization can proceed, but catalyst lifespan decreases due to sulfur poisoning
Solution Approach 1:
The patent implements preliminary sulfur removal through a hydrodesulfurization unit that operates before the isomerization unit. This预处理 protects the isomerization catalyst from sulfur poisoning, extending its operational lifespan while maintaining high isomerization conversion rates
3Object-affected harmful factors
If equipment is added to remove benzene from reformate, then benzene concentration decreases, but process complexity and costs increase
Solution Approach 1:
The patent applies preliminary action by removing sulfur upstream before isomerization, which prevents catalyst deactivation and maintains process efficiency. This approach avoids the need for additional downstream benzene removal equipment, thereby reducing process complexity while still meeting environmental specifications
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 benzene concentration, minimizes side reactions, and lowers equipment costs, resulting in a more efficient isomerization process that maintains high octane ratings and extends catalyst life.
Implementation Method 1
contacting the combined feed with a hydrogenation catalyst in a hydrogenation zone to saturate benzene
Implementation Method 2
contacting the saturated feedstock with an isomerization catalyst in an isomerization zone to convert normal paraffins to iso-paraffins
Data Source
AI summary
The benzene content in a gasoline pool is reduced by a process that hydrogenates a benzene-containing isomerization zone feedstream. The additional cyclic hydrocarbons produced by the saturation of benzene can be processed in the isomerization zone for ring opening to increase the available paraffinic feedstock or the isomerization zone can be operated to pass the cyclic hydrocarbons through to a product recovery section. The isomerization zone feedstream is treated to remove contaminants and dried before entering the hydrogenation zone.