Ionic Liquid Catalyst Regeneration via Hydrogenation and Metal Treatment
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Solution Overview
Problem
Ionic liquid catalysts, particularly chloroaluminate ionic liquids, become deactivated due to the formation of conjunct polymers, which weakens their acid strength and catalytic activity, making regeneration challenging and costly, hindering their commercial use.
Innovation Solution
A process involving contacting the used ionic liquid catalyst with a metal, such as aluminum, in the presence of hydrogen under regeneration conditions to remove conjunct polymers, thereby restoring the catalyst's activity without destroying the catalyst components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ionic liquid catalysts are used in catalytic reactions, then catalytic activity is achieved, but catalyst deactivation occurs due to conjunct polymer formation
Solution Approach 1:
The patent extracts and removes conjunct polymers from the ionic liquid catalyst system through filtration and washing processes. The conjunct polymers, which cause deactivation, are separated from the catalyst mixture, allowing the ionic liquid catalyst to be reused without the deactivating impurities.
Solution Approach 2:
The patent implements a process where the spent ionic liquid catalyst is recovered, treated to remove conjunct polymers, and then reused. The conjunct polymers are discarded as waste while the catalyst is recovered and regenerated for continued use, reducing the need for constant catalyst replacement.
2Reliability
If ionic liquid catalysts are regenerated by conventional methods, then catalyst activity is restored, but process complexity and cost increase
Solution Approach 1:
The patent employs a self-service regeneration approach where the ionic liquid catalyst system is treated with a base to neutralize acids and precipitate metals, allowing the catalyst to regenerate automatically without requiring complex external intervention or sophisticated regeneration equipment.
Solution Approach 2:
The patent changes the chemical parameters of the catalyst system by adjusting pH through base addition and controlling metal precipitation conditions. These parameter changes enable simple filtration and washing processes to effectively regenerate the catalyst without complex procedures.
3Productivity
If ionic liquid catalysts are replaced instead of regenerated, then fresh catalyst activity is achieved, but operating expenses and environmental impact increase
Solution Approach 1:
The patent recovers and reuses the ionic liquid catalyst after removing conjunct polymers, rather than discarding it as waste. This recovery process reduces catalyst loss and the need for continuous fresh catalyst production, lowering both environmental impact and operating expenses.
Solution Approach 2:
The patent converts the harmful effect of conjunct polymer formation into a beneficial separation process. The conjunct polymers, which initially deactivate the catalyst, are used as indicators to trigger the regeneration process, and their removal actually improves the catalyst system's long-term sustainability and reduces waste.
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 regenerates the ionic liquid catalysts by removing conjunct polymers, increasing their activity and extending their useful life, allowing for the practical and cost-effective reuse of these environmentally friendly catalysts.
Implementation Method 1
contacting the used ionic liquid catalyst with at least one metal in a regeneration zone in the presence of added hydrogen under regeneration conditions
Data Source
AI summary
A process for regenerating a used acidic ionic liquid catalyst comprising contacting the used ionic liquid catalyst with at least one ‘regeneration’ metal in a regeneration zone in the presence of added hydrogen under regeneration conditions for a time sufficient to increase the activity of the ionic liquid catalyst is described. In one embodiment, regeneration is conducted in the presence of a hydrocarbon solvent.