Acrylonitrile Dimer Catalyst Separation via Liquid-Liquid Extraction
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Solution Overview
Problem
The existing methods for preparing acrylonitrile dimer using phosphorus-based catalysts face challenges in catalyst separation due to decomposition and side reactions, particularly in homogeneous catalyst systems, where distillation methods are inefficient and require additional separation processes.
Innovation Solution
A method involving liquid-liquid extraction using an amine-based solvent to selectively extract the phosphorus-based catalyst from the reaction mixture, preventing catalyst decomposition and improving separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distillation is used as a catalyst recovery method, then the catalyst can be separated from the reaction mixture, but the high temperature and pressure during distillation cause decomposition of the catalyst or side reactions of the dimer product
Solution Approach 1:
The patent changes the separation method from thermal distillation to liquid-liquid extraction, fundamentally altering the separation parameters from high temperature/pressure to ambient or mild conditions. This resolves the contradiction by enabling catalyst separation without exposing it to conditions that cause decomposition
Solution Approach 2:
The patent introduces an extraction solvent as an intermediary substance that facilitates catalyst separation. The solvent selectively extracts the phosphorus-based catalyst from the reaction mixture through liquid-liquid extraction, allowing separation without direct thermal contact that would cause decomposition
2Productivity
If a homogeneous catalyst system is used, then the reaction has excellent reactivity and selectivity, but the catalyst becomes difficult to separate from the reaction mixture
Solution Approach 1:
The extraction solvent acts as an intermediary that selectively interacts with the homogeneous catalyst, forming a separate extract phase. This allows the catalyst to be removed from the reaction mixture without changing the homogeneous catalyst system itself, preserving reactivity while enabling separation
Solution Approach 2:
The patent changes the phase distribution parameters by introducing a selective extraction solvent that alters the solubility and partitioning behavior of the catalyst. This enables transition from a single-phase homogeneous system to a two-phase system where the catalyst can be selectively extracted
3Reliability
If liquid-liquid extraction is used to extract the catalyst, then catalyst decomposition and side reactions are prevented, but additional separation processes are required to recover the product from each solvent
Solution Approach 1:
The patent applies local quality by designing a solvent system where the extraction solvent has selective affinity for the catalyst rather than the product. This localized selectivity ensures that only the catalyst is extracted into the solvent phase, while the product remains in the raffinate phase, simplifying overall product recovery
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 effectively reduces catalyst decomposition and side reactions, allowing for efficient separation and recovery of the phosphorus-based catalyst, enhancing the production process for acrylonitrile dimer.
Implementation Method 1
adding an amine-based solvent to a reaction mixture containing the acrylonitrile dimer prepared in (1) and extracting the same to separate the acrylonitrile dimer and the phosphorus-based catalyst
Data Source
AI summary
The present disclosure relates to a method for preparing acrylonitrile dimer.