Carboxylation Catalyst Alkoxide Phase Separation Distillation
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Solution Overview
Problem
The existing catalytic processes for preparing α,β-ethylenically unsaturated carboxylic acid derivatives from CO2 and an alkene are inefficient due to thermodynamic limitations, unfavorable equilibria, and the need for costly and potentially harmful catalysts, as well as difficulties in separating the product from byproducts.
Innovation Solution
A catalytic process involving the contact of an alkene and carbon dioxide with a carboxylation catalyst and an alkoxide in an aprotic organic solvent, followed by phase separation to enrich the α,β-ethylenically unsaturated carboxylic acid salt and catalyst, and subsequent distillation of the alcohol byproduct, using an alkoxide with a secondary or tertiary carbon atom directly bound to an oxygen group to facilitate catalytic turnover under high CO2 pressure without the need for separate addition of the alkoxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalytic processes are used for preparing α,β-ethylenically unsaturated carboxylic acid derivatives from CO2 and alkene, then the reaction can proceed, but the process is inefficient due to thermodynamic limitations and unfavorable equilibria requiring multiple cycles
Solution Approach 1:
The patent combines the addition of CO2 and the alkoxide into a single simultaneous step, eliminating the need for separate sequential steps. The reaction mixture contains both CO2 and alkoxide together with the alkene and catalyst, allowing the catalytic cycle to proceed continuously without interruption for reagent addition, thereby improving productivity and reducing time loss.
Solution Approach 2:
The patent establishes a continuous catalytic cycle where the catalyst repeatedly facilitates the carboxylation reaction without requiring interruption. By maintaining favorable equilibrium conditions and allowing simultaneous presence of all reactants, the catalytic action continues uninterrupted, maximizing turnover efficiency and minimizing idle time between cycles.
2Productivity
If structurally constrained bidentate P,P ligands are used to achieve maximum turnover, then catalytic efficiency improves, but the cost increases and environmental harm increases due to expensive ligands and potentially harmful fluorinated compounds
Solution Approach 1:
The patent employs conventional, inexpensive phosphine ligands instead of expensive structurally constrained bidentate P,P ligands. These simpler ligands are cheaper to manufacture and less environmentally harmful. The catalyst system achieves sufficient turnover with these accessible ligands, eliminating the need for costly and potentially harmful fluorinated compounds while maintaining acceptable catalytic efficiency.
Solution Approach 2:
The patent avoids using harmful fluorinated phenoxide compounds by employing conventional alkoxides. This substitution eliminates the environmental harm associated with fluorinated compounds while still achieving effective catalysis. The harmful factor is removed entirely rather than converted, representing a cleaner approach to achieving the same catalytic function.
3Productivity
If phenolic bases are used in the catalytic process, then catalytic turnover is achieved, but the separation of product from byproduct becomes difficult due to similar solubility in polar and apolar solvents
Solution Approach 1:
The patent uses conventional alkoxides instead of phenolic bases, which results in alcohol byproducts with different solubility characteristics. These alcohol byproducts can be more easily separated from the carboxylic acid salt product through standard extraction and distillation techniques, reducing the complexity of the separation process while maintaining catalytic turnover.
Solution Approach 2:
The patent exploits the different solubility properties of the alcohol byproduct compared to phenolic byproducts. The alcohol byproduct exhibits favorable solubility behavior that allows selective extraction into specific phases, enabling simpler separation from the product. This local difference in solubility quality facilitates easier purification without requiring complex separation equipment or procedures.
4Reliability
If alkoxides are added separately from CO2 in sequential steps, then the reaction can proceed without direct reaction between alkoxide and CO2, but the process requires considerable effort in terms of energy and time due to multiple pressure and concentration adjustments
Solution Approach 1:
The patent merges the addition of CO2 and alkoxide into a single step, eliminating the need for sequential addition with intermediate pressure adjustments. Both reagents are introduced together with the alkene and catalyst, allowing the reaction to proceed without the energy-consuming cycles of pressurization and depressurization required by sequential addition methods, thereby reducing energy consumption while maintaining reliable reaction control.
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 process achieves efficient catalytic turnover with minimal effort, avoiding the use of harmful compounds and reducing the complexity of product purification, as the alkoxide with a sterically demanding residue suppresses undesired reactions and allows for the efficient removal of the alcohol byproduct by distillation.
Implementation Method 1
a catalytic process for preparing an α,β-ethylenically unsaturated carboxylic acid salt from an alkene, carbon dioxide, and an alkoxide
Implementation Method 2
an intermediate phase separation step
Implementation Method 3
The alcohol byproduct (the conjugate acid of the alkoxide) is distilled off after an intermediate phase separation step
Data Source
AI summary
A catalytic process for preparing an α,β-ethylenically unsaturated carboxylic acid salt from an alkene, carbon dioxide and an alkoxide having a secondary or tertiary carbon atom directly bound to a [O-] group is described. The alcohol byproduct is distilled off after an intermediate phase separation. This provides pure α,β-ethylenically unsaturated carboxylic acid salt at minimum effort.