Muconolactone Conversion to Stable Beta-Ketoadipate Esters
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Solution Overview
Problem
The existing methods for producing beta-ketoadipates are inefficient, unstable, and environmentally harmful due to the use of toxic reagents and byproducts, particularly in the production of polymers like nylon 6,6 and polyethylene terephthalate (PET).
Innovation Solution
A method is developed to convert muconolactone into beta-ketoadipates using a copper oxide catalyst supported on calcium oxide, which is more stable and reduces salt byproducts, employing a base and alcohol in the presence of a solvent to generate dimethyl beta-ketoadipate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If beta-ketoadipic acid is chlorinated to increase stability, then stability is improved, but toxic reagents are used and HCl is liberated
Solution Approach 1:
The patent converts the unstable beta-ketoadipic acid into stable beta-ketoadipates by reacting with alcohols to form ester derivatives. This transforms the harmful instability (decarboxylation) into a beneficial stable derivative that maintains the desired chemical properties without the instability problem, eliminating the need for toxic chlorination while achieving the stability goal
Solution Approach 2:
The patent changes the chemical parameter by converting the carboxylic acid group into an ester group through reaction with alcohols. This parameter change (from acid to ester) fundamentally alters the stability characteristic while maintaining the core molecular structure and functionality needed for polymer production
2Productivity
If traditional methods are used to produce beta-ketoadipates, then production is achieved, but salt byproducts are generated in large amounts
Solution Approach 1:
The patent extracts and eliminates the salt byproduct formation step by using a different reaction pathway. Instead of traditional methods that produce salt, the invention uses base-catalyzed esterification that produces water as the byproduct, effectively taking out the harmful salt generation from the process while maintaining productive beta-ketoadipate synthesis
Solution Approach 2:
The patent introduces a base catalyst as an intermediary that enables the esterification reaction to proceed without generating salt byproducts. The base facilitates the reaction between methyl muconolactone and alcohol to form beta-ketoadipate esters, with water as the only byproduct, thus mediating the reaction to avoid salt formation while maintaining high productivity
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
The method produces stable beta-ketoadipates efficiently with reduced salt byproducts, enhancing the stability and cost-effectiveness of polymer production processes.
Implementation Method 1
reacting the methyl muconolactone in the presence of a base and an alcohol, thereby generating a beta-ketoadipate
Data Source
AI summary
Described herein are materials and methods to generate beta-ketoadipates cost-efficiently and with reduced environmental impact from muconolactone. Advantageously, the described beta-ketoadipates, including dimethyl beta-ketoadipates, are more stable than traditional βKA and can be produced with a reduction in the amount of salt byproducts, by as much as half.