Ionic Liquid Catalyst Regeneration via Isoparaffin Extraction
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Solution Overview
Problem
Ionic liquid catalysts, particularly chloroaluminate ionic liquids, become deactivated due to the formation of conjunct polymers, leading to a loss of catalytic activity and the inability to regenerate them, which hinders their commercial use.
Innovation Solution
A process involving the contact of used ionic liquid catalysts with an isoparaffin-containing stream and a Bronsted acid under alkylation conditions to remove conjunct polymers, thereby regenerating the catalyst and restoring its activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionic liquid catalysts are used in alkylation reactions, then catalytic activity is achieved, but catalyst deactivation occurs due to conjunct polymer formation
Solution Approach 1:
The patent applies the discarding and recovering principle by separating the deactivated ionic liquid catalyst from conjunct polymers through extraction with hydrocarbon solvents, then regenerating the catalyst for continued use. This process recovers the active catalyst component while removing the deactivating polymers, extending catalyst lifespan without replacing it entirely.
Solution Approach 2:
The patent converts the harmful effect of conjunct polymer formation into a beneficial separation process. By allowing conjunct polymers to form and then systematically removing them through solvent extraction, the process transforms catalyst deactivation into a regenerable condition, turning a permanent failure mode into a reversible state.
2Reliability
If ionic liquid catalysts are replaced when deactivated, then fresh catalytic activity is restored, but operating costs increase significantly
Solution Approach 1:
Instead of discarding deactivated catalysts entirely, the patent recovers and regenerates them through extraction and purification processes. This reduces the need for continuous purchase and replacement of expensive ionic liquid catalysts, significantly lowering operating costs while maintaining catalytic activity.
Solution Approach 2:
The regeneration process enables the catalyst system to serve itself by recovering and reactivating deactivated catalysts in situ. This self-service capability eliminates the need for external catalyst replacement operations, reducing both material costs and operational interruptions.
3Reliability
If catalyst replacement is performed frequently, then process reliability is maintained, but process shutdown time increases
Solution Approach 1:
The patent enables continuous catalyst regeneration by performing extraction and purification operations without complete process shutdown. The ionic liquid catalyst can be regenerated in continuous or semi-continuous modes, maintaining process continuity and eliminating frequent shutdowns that would otherwise be required for catalyst replacement.
4Reliability
If conjunct polymers accumulate in the catalyst, then catalyst selectivity decreases, but removal processes add complexity
Solution Approach 1:
The patent applies extraction principles by using hydrocarbon solvents to selectively remove conjunct polymers from the ionic liquid catalyst phase. This separation process extracts the unwanted polymers while leaving the active catalyst intact, restoring selectivity through a relatively simple liquid-liquid extraction operation.
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
The process effectively reactivates the ionic liquid catalysts, maintaining or exceeding the activity of fresh catalysts, allowing for continuous use and reducing operational costs by preventing the need for frequent replacement.
Implementation Method 1
Ionic liquids may be suitable for example for use as a catalyst and as a solvent in alkylation and polymerization reactions
Implementation Method 2
contacting the used ionic liquid catalyst with an isoparaffin-containing stream and Bronsted acid in a reaction zone under alkylation conditions
Data Source
AI summary
A process for regenerating a used acidic ionic liquid catalyst comprising contacting the used ionic liquid catalyst with an isoparaffin-containing stream and Broensted acid in a reaction zone under alkylation conditions for a time sufficient to increase the activity of the ionic liquid catalyst is disclosed.