Homogeneous Catalyst Reactivation via Aqueous Base pH Adjustment
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Solution Overview
Problem
The conversion of organic compounds in catalytic systems decreases over time due to catalyst deactivation, leading to increased costs and environmental pollution from the need for continuous fresh catalyst addition, and catalyst precipitation that disrupts reaction processes.
Innovation Solution
A method involving the reactivation of a homogeneous catalyst system using an aqueous base at specific pH levels, comprising metals in their highest oxidation state and phosphorus derivatives, to maintain catalyst activity and prevent precipitation, thereby reducing the need for fresh catalyst and minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fresh catalyst is continuously added to compensate for decreasing conversion, then conversion is maintained, but catalyst concentration increases and catalyst precipitates
Solution Approach 1:
The patent changes the pH parameter of the reaction medium by adding aqueous base to reactivate the catalyst. This parameter change restores the catalyst's solubility and activity, preventing precipitation while maintaining conversion. The pH adjustment transforms the catalyst from a precipitated inactive form to a soluble active form.
Solution Approach 2:
The catalyst system is designed to be self-reactivating through periodic base addition. Instead of requiring complete replacement with fresh catalyst, the same catalyst can be regenerated in situ by adjusting pH, allowing it to continue functioning without external intervention for catalyst replacement.
2Productivity
If fresh catalyst is continuously added to maintain conversion, then conversion is maintained, but catalyst consumption increases
Solution Approach 1:
Instead of discarding deactivated catalyst and adding fresh catalyst continuously, the patent recovers the deactivated catalyst by adjusting pH to reactivate it. This recovery process allows the same catalyst to be reused multiple times, significantly reducing catalyst consumption and waste.
Solution Approach 2:
The catalyst system performs self-recovery through periodic base addition, eliminating the need for continuous fresh catalyst input. The catalyst reactivates itself when pH is adjusted, reducing dependency on external catalyst supply.
3Productivity
If catalyst concentration is increased to maintain conversion, then conversion is maintained, but reaction regime is disrupted and membrane filter is blocked
Solution Approach 1:
The patent uses pH adjustment as a control parameter to maintain catalyst solubility and prevent precipitation. By keeping the catalyst in solution through periodic base addition, the reaction regime remains stable and membrane filters remain unclogged, ensuring continuous operation.
Solution Approach 2:
The system implements feedback control by monitoring catalyst performance and adding base when deactivation is detected. This feedback mechanism prevents catalyst precipitation and maintains stable reaction conditions, avoiding disruptions and filter blockages.
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 method allows for sustained high conversion of organic compounds without catalyst precipitation, reducing the amount of fresh catalyst required and minimizing environmental pollution, while maintaining catalyst activity and preventing precipitation.
Implementation Method 1
The catalyst system is reactivated by addition of at least one aqueous base at a pH≥4, preferably ≥4.5, preferably ≥7 and particularly preferably ≥11
Implementation Method 2
an unsaturated organic compound is oxidized in a reaction mixture to obtain an epoxidized product
Implementation Method 3
The reaction mixture comprises a homogeneous catalyst system, which catalyses the oxidation of the organic compound
Data Source
AI summary
The present invention relates to a method for the reactivation of homogeneous catalyst systems from organic reaction mixtures. The catalyst systems are suitable for the oxidation of organic compounds such as, for example, cyclododecene. The reactivation is carried out using an aqueous base.