Iso-pentane Alkylation with Ionic Liquid Catalyst
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Solution Overview
Problem
Current processes for reacting iso-pentane to produce alkylate products face challenges in efficiently converting olefinic feedstocks while minimizing the formation of undesired components like iso-butane and optimizing the production of naphtha and middle distillates.
Innovation Solution
The process involves partial conversion of olefinic feedstocks using an ionic liquid catalyst to reduce undesired components, followed by alkylation with iso-pentane, specifically targeting a feedstock with a high percentage of 2-pentene to produce naphtha and middle distillates, while maintaining a low iso-butane formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If complete conversion of olefinic feedstock is performed, then productivity is improved, but manufacturing precision deteriorates due to increased formation of undesired components like iso-butane
Solution Approach 1:
The patent applies partial conversion by intentionally limiting the conversion of olefinic feedstock to approximately 30-70% in a first reactor, rather than achieving complete conversion. This partial action prevents excessive formation of undesired components like iso-butane while still producing significant amounts of desired alkylate products. The unconverted olefins are then processed in a second reactor to achieve higher overall conversion without the harmful effects of complete single-stage conversion.
Solution Approach 2:
The conversion process is segmented into two distinct reaction stages using two separate reactors with different operating conditions and catalysts. The first reactor performs partial conversion with specific conditions, while the second reactor completes the conversion with different parameters. This segmentation allows optimization of each stage for its specific function, improving overall product selectivity while maintaining high productivity.
2Ease of operation
If conventional alkylation process is used, then ease of operation is maintained, but object-generated harmful factors increase due to significant iso-butane formation
Solution Approach 1:
The alkylation process is divided into two sequential reaction stages, each optimized for different aspects of the conversion. The first reactor handles the initial alkylation with controlled conversion to minimize iso-butane formation, while the second reactor processes the remaining olefins under different conditions. This segmentation reduces harmful byproducts while maintaining operational feasibility through a structured two-step approach.
Solution Approach 2:
The patent changes key process parameters between the two reactors, including temperature, pressure, catalyst type, and olefin-to-isoalkane ratio. By adjusting these parameters in the second reactor compared to conventional single-stage processes, the formation of iso-butane is significantly reduced while maintaining ease of operation through systematic parameter optimization.
3Device complexity
If single-stage alkylation is performed, then device complexity is reduced, but manufacturing precision deteriorates due to inability to control product distribution
Solution Approach 1:
The alkylation system is segmented into two distinct reactor units, each with specific functions and operating conditions. The first reactor is optimized for initial conversion with controlled product distribution, while the second reactor handles the remaining feedstock with different parameters. This segmentation enables precise control over product distribution and composition that cannot be achieved in a single-stage process.
Solution Approach 2:
The first reactor performs partial conversion at optimized levels to achieve desired product distribution, avoiding the drawbacks of complete conversion in a single stage. This partial action approach allows better control over intermediate product formation and composition, with the second reactor then completing the conversion under different conditions for overall optimization.
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 iso-butane formation and enhances the yield of naphtha and middle distillates, improving the overall efficiency and product quality by selectively converting and alkylating the olefinic feedstock.
Implementation Method 1
partially converting one or more olefins in the olefinic feedstock with an ionic liquid catalyst to make a converted olefinic feedstock
Data Source
AI summary
A process for reacting an iso-pentane, comprising: alkylating the iso-pentane with a converted olefinic feedstock comprising at least 5 wt % C5 olefins, wherein the C5 olefins in the converted olefinic feedstock are predominantly 2-pentene, to make a naphtha and a middle distillate, and wherein a formation of iso-butane during the alkylating is less than 35 wt % of an amount of olefins in the converted olefinic feedstock.