Solid Catalyst Activity Extension via Soluble Organometallic Additives
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Solution Overview
Problem
Current processes for producing organic carbonates using heterogeneous catalysts face challenges with short catalyst cycle lengths due to polymer deposition and metal leaching, leading to inefficient and costly operations.
Innovation Solution
Incorporating a trace amount of soluble organometallic compounds of the same Group II to VI metals as the catalyst into the feed stream to maintain catalyst activity and extend cycle length, counteracting metal leaching and polymer deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If heterogeneous catalysts are used for producing organic carbonates, then catalyst separation is simplified, but catalyst cycle length is short due to polymer deposition and metal leaching
Solution Approach 1:
The soluble organometallic compound continuously replenishes the active metal sites on the heterogeneous catalyst surface, allowing the catalyst to self-regenerate and maintain activity without external intervention for extended periods
Solution Approach 2:
Changing the physical state of the catalyst system by introducing a soluble organometallic compound that dynamically adjusts the surface metal concentration, transforming the static heterogeneous catalyst into a dynamically regenerating system
2Productivity
If homogeneous catalysts are used for producing organic carbonates, then catalyst activity is high, but catalyst separation and recovery is difficult
Solution Approach 1:
The heterogeneous catalyst acts as an intermediary carrier for the organometallic active sites, providing the benefits of homogeneous catalysis (high activity) while enabling easy separation through filtration or decantation
Solution Approach 2:
Creating a composite catalytic system where soluble organometallic compounds are supported on or near heterogeneous catalyst surfaces, combining the advantages of both homogeneous and heterogeneous catalysts
3Duration of action of stationary object
If trace amounts of soluble organometallic compounds are added to maintain catalyst activity, then catalyst cycle length is extended, but process complexity increases
Solution Approach 1:
The soluble organometallic compound continuously replenishes the active metal sites on the heterogeneous catalyst surface, allowing the catalyst to self-regenerate and maintain activity without external intervention for extended periods
Solution Approach 2:
Changing the physical state of the catalyst system by introducing a soluble organometallic compound that dynamically adjusts the surface metal concentration, transforming the static heterogeneous catalyst into a dynamically regenerating system
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 significantly extends the catalyst cycle time, reducing downtime and costs by maintaining stable catalyst activity for over a year, enabling continuous and efficient production of organic carbonates.
Implementation Method 1
Process for continuous production of organic carbonates or organic carbamates and solid catalysts therefore
Data Source
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AI summary
Processes for the alcoholysis, inclusive of transesterification and/or disproportionation, of reactants are disclosed. The alcoholysis process may include feeding reactants and a trace amount of soluble organometallic compound to a reactor comprising a solid alcoholysis catalyst, wherein the soluble organometallic compound and the solid alcoholysis catalyst each independently comprise a Group II to Group VI element, which may be the same element in various embodiments. As an example, diphenyl carbonate may be continuously produced by performing transesterification over a solid catalyst followed by disproportionation, where a trace amount of soluble organometallic compound is fed to the transesterification reactor. Also disclosed is a process for reactivating a spent solid alcoholysis catalyst, such as a catalyst useful for transesterifications and/or disproportionations, the process including removing polymeric materials deposited on the catalyst and re-depositing catalytically active metals on the solid catalyst.