Ionic Liquid Catalyst for Paraffin Disproportionation
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Solution Overview
Problem
Current methods for paraffin disproportionation and isomerization in the petroleum industry face challenges such as high temperatures, use of hazardous chemicals, and inefficient product composition control, leading to suboptimal production of desired hydrocarbon products like gasoline and diesel.
Innovation Solution
A hydrocarbon conversion process using reverse disproportionation with an ionic liquid catalyst and carbocation promoter, allowing for the selective production of intermediate carbon count paraffins by controlling the C/H molar ratio of feed streams, thereby tuning product composition to meet market demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts (zeolites, sulfated zirconias, AlCl2/SiO2, ionic solids, platinum on Al2O3/Ga2O3 supports) are used for paraffin disproportionation, then the desired paraffin disproportionation reaction is achieved, but elevated temperatures (120-450° C.) are required
Solution Approach 1:
The patent changes the temperature parameter by using ionic liquids as catalysts that enable disproportionation reactions to proceed at lower temperatures (below 100° C.) compared to conventional catalysts requiring 120-450° C. This parameter change is achieved through the unique catalytic properties of ionic liquids, which provide alternative reaction pathways with lower activation energy barriers.
Solution Approach 2:
The patent introduces ionic liquids as intermediary catalysts between the reactants and products. The ionic liquids mediate the disproportionation reaction by forming intermediate complexes with the paraffins, enabling the reaction to proceed at lower temperatures through their unique catalytic mechanism involving carbocation intermediates.
2Temperature
If HF/TiF4 system is used for disproportionation at 51° C., then low temperature operation is achieved, but dangerous HF is utilized
Solution Approach 1:
The patent replaces dangerous HF/TiF4 system with ionic liquids that can be easily disposed of or recycled. The ionic liquids serve as temporary catalysts that can be separated from the product mixture and reused, eliminating the need for hazardous chemicals like HF while maintaining low temperature operation.
Solution Approach 2:
The patent converts the harmful HF/TiF4 system into a beneficial ionic liquid catalyst system. The ionic liquids provide similar low-temperature catalytic activity without the hazards of HF, turning a harmful process into a safer one while maintaining the desired low temperature operation.
3Temperature
If supported ionic liquid is used for disproportionation at 85-125° C., then moderate temperature operation is achieved, but the ionic liquid is deactivated by leaching from the support
Solution Approach 1:
The patent extracts the ionic liquid from the support structure, using it as a free-flowing liquid catalyst rather than immobilizing it on a support. This extraction eliminates the leaching problem while maintaining the catalytic activity at moderate temperatures, as the ionic liquid remains in the liquid phase and can be easily separated and reused.
Solution Approach 2:
The patent makes the ionic liquid catalyst universally applicable without requiring a specific support structure. The ionic liquid can catalyze the disproportionation reaction in its pure liquid form, serving multiple functions: catalysis, heat transfer medium, and easily separable from products, eliminating the need for support materials.
4Productivity
If supported ionic liquid is used for disproportionation, then catalytic activity is achieved, but the support increases catalyst cost and may chemically react with the acidic ionic liquid over time
Solution Approach 1:
The patent extracts the ionic liquid from the support system, using it as a standalone catalyst without any support material. This simplifies the catalyst system by removing the support component, reducing complexity, and eliminating potential chemical reactions between the support and acidic ionic liquid over time.
Solution Approach 2:
The patent segments the catalytic function from the support structure, allowing the ionic liquid to perform catalysis independently. This segmentation enables the ionic liquid to be easily separated from the reaction mixture and reused, simplifying the overall process and eliminating the need for complex support materials.
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 process enables the production of desired hydrocarbon products with improved octane numbers and vapor pressure, allowing refiners to efficiently shift production based on market needs and maximize the use of lower-value feeds, while operating at lower temperatures and pressures.
Implementation Method 1
The reaction is catalyzed by an ionic liquid and a carbocation promoter. The ionic liquid is formed from an N-containing heterocyclic and/or N-containing aliphatic organic cation and an inorganic anion derived from metal halides.
Implementation Method 2
This invention relates to the catalytic reverse disproportionation of paraffins using ionic liquids
Data Source
AI summary
A reverse disproportionation reaction of two hydrocarbon feeds allows production of a reaction mixture containing products with intermediate carbon numbers. The amount of at least one of the products with intermediate carbon numbers is equal to or greater than the amount formed from disproportionation of the hydrocarbon alone. A reverse disproportionation reaction mixture is also described.