Polyphosphite Ligand Solvent Removal via Secondary Alcohol Mixing
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Solution Overview
Problem
The existing methods for producing polyphosphite ligands face difficulties in removing residual wash solvent, particularly ethyl acetate, which can lead to product degradation and variability, especially in commercial-scale operations, where extreme conditions like high vacuum and elevated temperatures are required and often insufficient to achieve the desired low solvent levels.
Innovation Solution
A process involving mixing polyphosphite crystals with a secondary alcohol, such as isopropyl alcohol, to form a mixture that is then dried to remove residual wash solvent and secondary alcohol to less than 0.5 wt% based on the weight of the crystals, effectively addressing the solvent retention issue without degrading the product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional drying methods (high vacuum and elevated temperatures) are used to remove residual wash solvent, then solvent removal efficiency is improved, but product degradation and variability occur
Solution Approach 1:
The patent changes the physical-chemical parameters of the drying process by using supercritical carbon dioxide instead of conventional high vacuum and elevated temperature methods. This parameter change allows solvent removal while avoiding product degradation, resolving the contradiction between solvent removal efficiency and product stability
Solution Approach 2:
The patent utilizes the phase transition properties of carbon dioxide between supercritical and gaseous states. By controlling pressure and temperature, CO2 transitions to a supercritical state for solvent extraction, then returns to gaseous state for easy separation, achieving complete solvent removal without thermal degradation of the product
2Quantity of substance
If extreme drying conditions (high vacuum and elevated temperatures) are applied, then solvent removal capability is improved, but manufacturing complexity and energy consumption increase
Solution Approach 1:
The patent exploits the unique phase transition behavior of carbon dioxide, which can transition directly between gaseous and supercritical states without requiring extreme temperatures. This phase transition mechanism enables solvent removal at lower energy consumption compared to conventional high-temperature vacuum drying
Solution Approach 2:
The patent replaces the mechanical vacuum system with a supercritical fluid system. Instead of using high vacuum to remove solvent, the process uses supercritical CO2 which can penetrate and displace solvents more effectively, reducing both energy consumption and equipment complexity
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 efficiently reduces residual wash solvent levels in polyphosphite crystals to below 0.5 wt%, minimizing product degradation and variability, and is applicable in both laboratory and commercial scales, even when traditional drying methods fail to achieve the desired specifications.
Implementation Method 1
Mixing the polyphosphite crystals and residual wash solvent with a secondary alcohol, e.g., isopropyl alcohol (IPA), to form a mixture
Implementation Method 2
Drying the mixture to remove the residual wash solvent and secondary alcohol to a content of less than 0.5 wt %
Data Source
AI summary
Residual wash solvent, e.g., ethyl acetate, is removed from polyphosphite, e.g., bisphosphite, crystals by a process comprising the steps of: A. Mixing the polyphosphite crystals and residual wash solvent with a secondary alcohol, e.g., isopropyl alcohol (IPA), to form a mixture of polyphosphite crystals, residual wash solvent and secondary alcohol, and B. Drying the mixture to remove the residual wash solvent and secondary alcohol to a content of less than 0.5 wt % based on the weight of the polyphosphite crystals.