Ionic Liquid Catalyst Regeneration via Hydrogenation
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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 combination of used ionic liquid catalysts with aluminum metal and hydrochloric acid under hydrogenation conditions to saturate the double bonds of conjunct polymers, releasing bound aluminum chloride and producing fresh catalyst components, allowing for the regeneration of the ionic liquid catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ionic liquid catalysts are used in alkylation processes, then catalytic activity is achieved, but the catalyst becomes deactivated due to conjunct polymer formation
Solution Approach 1:
The patent extracts and removes the harmful conjunct polymers from the ionic liquid catalyst system through hydrogenation. The polymers are saturated and separated from the catalyst, allowing the catalyst to be regenerated and reused, thus resolving the deactivation issue while maintaining high catalytic activity
Solution Approach 2:
The patent changes the chemical state of the conjunct polymers from unsaturated to saturated through hydrogenation. This parameter change transforms the polymers from catalytically active but harmful species into inactive, removable substances, enabling catalyst regeneration and maintaining reliability
2Productivity
If ionic liquid catalysts are regenerated, then catalyst reuse is enabled, but the process complexity increases
Solution Approach 1:
The patent merges the hydrogenation step with the catalyst regeneration step into a single integrated process. The metal catalyst facilitates both the hydrogenation of polymers and the regeneration of the ionic liquid catalyst simultaneously, simplifying the overall process while enabling continuous reuse
Solution Approach 2:
The patent employs a metal catalyst that can be recovered and reused, allowing the system to serve itself through automated filtration and recycling. This self-service approach reduces manual intervention and process complexity while maintaining high catalyst reuse efficiency
3Productivity
If conjunct polymers are removed from the catalyst, then catalyst activity is restored, but the loss of time for regeneration occurs
Solution Approach 1:
The patent performs preliminary hydrogenation of the conjunct polymers during the catalyst regeneration phase. By saturating the polymers before separation, the process prepares the catalyst for immediate reuse without requiring additional treatment steps, thus minimizing time loss while restoring full activity
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 removes conjunct polymers, restoring and even exceeding the catalytic activity of freshly prepared catalysts, enabling the continuous regeneration and reuse of ionic liquid catalysts in alkylation processes.
Implementation Method 1
combining the used catalyst, a metal and a Broensted acid which acts as a source of hydrogen in a reaction zone under hydrogenation conditions
Implementation Method 2
Hydrogenation in chloroaluminate ionic liquids in the presence of an electropositive metal and HCl was reported by K. R. Seddon et al
Data Source
AI summary
A process for regenerating a used acidic ionic liquid catalyst which has been deactivated by conjunct polymers comprising combining the used catalyst, a metal and a Broensted acid which acts a source of hydrogen in a reaction zone under hydrogenation conditions for a time sufficient to hydrogenate at least a portion of the conjunct polymer is disclosed.