Hydrogenated Diene Polymer Catalyst Recovery via pH-Controlled Complexation
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Solution Overview
Problem
Current methods for producing hydrogenated conjugated diene polymer latex face challenges in efficiently removing and recovering hydrogenation catalysts, particularly due to difficulties in separating unsupported catalysts from the latex, leading to high catalyst costs and inefficient recovery processes.
Innovation Solution
A method involving the dissolution or dispersion of a platinum group element catalyst in the latex to hydrogenate carbon-carbon unsaturated bonds, followed by adjusting the pH to 5.0-8.0 to form an insoluble complex with a complexing agent, allowing for efficient removal and recovery of the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an unsupported catalyst is used to hydrogenate conjugated diene polymer in latex state, then hydrogenation activity is enhanced and contact efficiency is improved, but separation of the catalyst after reaction is extremely difficult and recovery is not possible
Solution Approach 1:
The patent introduces a complexing agent as an intermediary substance that forms an insoluble complex with the platinum group element catalyst. This complexing agent acts as a mediator that transforms the catalyst from a soluble/dispersible state (good for hydrogenation activity) to an insoluble complex state (good for separation and recovery), thereby resolving the contradiction between enhanced hydrogenation activity and ease of catalyst separation.
2Ease of operation
If a supported catalyst is used for hydrogenation, then catalyst separation is easy, but the process requires additional operations of dissolving source polymer and distilling organic solvent, reducing productivity
Solution Approach 1:
The patent changes the chemical state parameter of the catalyst by forming an insoluble complex with a complexing agent. This parameter change allows the catalyst to remain in the aqueous latex system during hydrogenation (maintaining productivity) while enabling easy separation through filtration or centrifugation after the reaction, thus resolving the contradiction between ease of separation and production efficiency.
3Ease of operation
If complexing agent is used to form insoluble complex with catalyst, then catalyst recovery is possible, but removal and recovery efficiency is not necessarily sufficient
Solution Approach 1:
The patent applies local quality by carefully controlling the pH range (5.0-8.0) at which the complexing agent forms the insoluble complex with the platinum group element. This localized control of pH conditions ensures optimal complex formation for high recovery efficiency while maintaining catalyst activity during the hydrogenation process, thereby resolving the contradiction between catalyst recovery possibility and recovery efficiency.
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 enables the energy-saving and rapid removal and recovery of the hydrogenation catalyst, achieving high efficiency and reducing catalyst costs, while maintaining the quality of the hydrogenated conjugated diene polymer latex.
Implementation Method 1
a hydrogenation step of dissolving or dispersing a hydrogenation catalyst containing a platinum group element in a latex of a conjugated diene polymer to hydrogenate a carbon-carbon unsaturated bond in the conjugated diene polymer
Implementation Method 2
hydrogenation catalyst containing a platinum group element
Implementation Method 3
an insoluble complex formation step of complexing the platinum group element in the latex with a complexing agent to form an insoluble complex; wherein pH of the latex at the insoluble complex formation step is adjusted in a range of 5.0 to 8.0
Implementation Method 4
form an insoluble complex
Data Source
AI summary
A method for producing a hydrogenated conjugated diene polymer latex includes: a hydrogenation step of dissolving or dispersing a hydrogenation catalyst containing a platinum group element in a latex of a conjugated diene polymer to hydrogenate a carbon-carbon unsaturated bond in the conjugated diene polymer; and an insoluble complex formation step of complexing the platinum group element in the latex with a complexing agent to form an insoluble complex, wherein pH of the latex at the insoluble complex formation step is controlled in a range of 5.0 to 8.0.