Composite Catalyst for Beta-Hydroxycarboxylic Acid Ester Synthesis
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Solution Overview
Problem
Current methods for synthesizing β-hydroxycarboxylic acid esters are inefficient, with low yields, high raw material costs, harsh conditions, and environmental concerns, making industrial production challenging.
Innovation Solution
A method involving a carbonylation esterification reaction using a composite catalyst comprising a cobalt salt, a nitrogen-containing heterocyclic compound, and a base metal, performed in a carbon monoxide atmosphere, which simplifies the process, reduces waste, and lowers costs, suitable for industrial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis method using bis(2,2,6,6-tetramethyl-1-piperidine)zinc catalyst is used, then the reaction can proceed, but the yield is only 42% and separation is very difficult
Solution Approach 1:
The patent changes the catalyst system from bis(2,2,6,6-tetramethyl-1-piperidine)zinc to a composite catalyst containing cobalt salt, nitrogen-containing heterocyclic compound, and base metal. This parameter change in catalyst composition dramatically improves the reaction yield from 42% to over 90%, while also simplifying the product separation process.
2Productivity
If sodium borohydride method is used, then the target product can be obtained, but the reaction yield is only 74% and the raw material cost is high
Solution Approach 1:
The patent replaces the expensive sodium borohydride reagent with a composite catalyst system based on inexpensive cobalt salt, nitrogen-containing heterocyclic compound, and base metal. This substitution significantly reduces raw material costs while improving the reaction yield from 74% to over 90%.
3Productivity
If cobalt carbonylation method is used, then the reaction can proceed, but the synthesis conditions are harsh and the yield is low
Solution Approach 1:
The patent employs a composite catalyst consisting of cobalt salt, nitrogen-containing heterocyclic compound, and base metal that works under mild conditions. This composite catalyst system achieves high reaction yields of over 90% without requiring the harsh high-temperature and high-pressure conditions needed for traditional cobalt carbonylation methods.
4Reliability
If chiral epichlorohydrin synthesis route is used, then chiral β-hydroxycarboxylic acid esters can be produced, but the process uses highly toxic sodium cyanide and generates large amount of waste
Solution Approach 1:
The patent eliminates the use of highly toxic sodium cyanide and chiral epichlorohydrin by using a composite catalyst system that enables direct carbonylation of epoxy compounds. This approach converts a harmful multi-step synthesis route into a benign one-step process that produces chiral β-hydroxycarboxylic acid esters with high optical purity without generating toxic waste.
5Reliability
If asymmetric catalytic hydrogenation is used, then chiral β-hydroxycarboxylic acid esters can be obtained, but expensive chiral phosphorus ligand catalyst is required and special equipment is needed
Solution Approach 1:
The patent replaces expensive chiral phosphorus ligand catalysts and special acid-resistant high-pressure equipment with a composite catalyst system based on inexpensive cobalt salt, nitrogen-containing heterocyclic compound, and base metal. This substitution maintains high optical purity while eliminating the need for complex specialized equipment.
6Reliability
If enzymatic method is used, then chiral β-hydroxycarboxylic acid esters can be produced, but high purity substrate is required and the process is cumbersome
Solution Approach 1:
The patent changes from enzymatic catalysis requiring high purity substrates and multiple derivatization steps to a composite chemical catalyst system that works with simple epoxy compounds. This parameter change in catalysis approach simplifies the process significantly while maintaining high optical purity of the chiral β-hydroxycarboxylic acid esters.
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 achieves high conversion rates, is environmentally friendly, and maintains optical purity, making it suitable for industrial-scale production of β-hydroxycarboxylic acid esters without the need for expensive catalysts or harsh conditions.
Implementation Method 1
mixing an alkylene oxide, a monohydric alcohol and a composite catalyst, and performing a carbonylation esterification reaction in a carbon monoxide atmosphere
Implementation Method 2
performing a carbonylation esterification reaction in a carbon monoxide atmosphere to obtain the β-hydroxycarboxylic acid ester
Data Source
AI summary
A method of preparing β-hydroxycarboxylic acid ester comprises mixing an alkylene oxide, a monohydric alcohol and a composite catalyst, and performing a carbonylation esterification reaction in a carbon monoxide atmosphere to obtain the β-hydroxycarboxylic acid ester. The composite catalyst comprises a main catalyst, a cocatalyst and a reducing agent. the main catalyst is at least one of a cobalt salt, cobalt oxide and cobalt hydroxide. The cocatalyst is a nitrogen-containing heterocyclic compound. The reducing agent is a base metal. The method is an atomic reaction type process, does not produce three wastes, and has high conversion rate. It is a green environmental protection process. The composite catalyst used does not contain Co2(CO)8. The raw materials and catalyst used are all cheap and easily available. The composite catalyst can be used repeatedly at a lower cost, and is suitable for industrial applications.