Oxidative Dehydrogenation of Lactate Esters to Pyruvate
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Solution Overview
Problem
Current methods for synthesizing pyruvates from lactates often require expensive dehydrating agents, complex catalyst systems, and precise reaction conditions, resulting in low yields and selectivity.
Innovation Solution
A simple one-step oxidative dehydrogenation process using alkyl lactates with peroxides in the presence of transition metal salts or oxides as catalysts at mild temperatures (25-100°C) in organic solvents, achieving high selectivity and conversion rates for pyruvate production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional dehydrative decarboxylation of tartaric acid is used to produce pyruvic acid, then pyruvate can be obtained, but the process requires excess KHSO4 as a dehydrating agent, leading to high cost and waste
Solution Approach 1:
The patent employs hydrogen peroxide (H2O2) as a strong oxidizing agent to achieve oxidative decarboxylation of tartaric acid, converting it directly to pyruvate without requiring traditional dehydrating agents like KHSO4. This oxidation-based approach eliminates the need for excess dehydrating agents, reducing waste and simplifying the process while maintaining high efficiency.
Solution Approach 2:
The patent changes the reaction parameters by using a heterogeneous catalyst system (metal salts or oxides supported on silica gel or alumina) instead of homogeneous acid catalysts. This allows for easier separation and reuse of catalysts, reduces waste, and enables the reaction to proceed under milder conditions, thereby improving ease of manufacture and reducing substance loss.
2Productivity
If microbial processes using yeast or E. coli are used to obtain pyruvate, then pyruvate can be produced, but precise regulation of media composition and complex supplements are required
Solution Approach 1:
The patent replaces the complex biological fermentation system with a chemical catalytic system using metal salts or oxides as catalysts. This substitution eliminates the need for living organisms, complex media composition regulation, and sophisticated fermentation control systems, while maintaining high productivity for pyruvate production.
Solution Approach 2:
The patent uses simple, inexpensive, and easily disposable catalyst supports like silica gel or alumina, which can be easily separated from the reaction mixture by filtration. This replaces the need for complex, expensive, and difficult-to-manage biological systems, simplifying the overall process while maintaining productivity.
3Manufacturing precision
If TBHP and TBAB are used for oxidative dehydrogenation of ethyl lactate, then ethyl pyruvate with over 98% purity is obtained, but the process requires phase transfer catalyst and specific oxidant system
Solution Approach 1:
The patent uses hydrogen peroxide as an intermediary oxidizing agent that can be easily decomposed into water and oxygen, leaving no harmful residues. This simple oxidant system, combined with heterogeneous catalysts, achieves high product purity while avoiding the complexity of phase transfer catalysts and specialized oxidant systems, simplifying the overall process.
4Speed
If high temperature (300°C) is used for dehydrative decarboxylation, then reaction proceeds, but expensive dehydrating agent and energy consumption increase
Solution Approach 1:
The patent changes the temperature parameter from high (300°C) to mild conditions (room temperature to 60°C) by employing hydrogen peroxide as the oxidizing agent and using heterogeneous metal catalysts. These catalysts lower the activation energy of the reaction, enabling it to proceed rapidly at low temperatures, thereby reducing energy consumption while maintaining high reaction rates.
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 >90% selectivity and up to 98% conversion of alkyl lactates to pyruvates with mild reaction conditions, avoiding costly dehydrating agents and complex catalyst systems, and providing a more efficient and environmentally friendly synthesis method.
Implementation Method 1
reacting an alkyl lactate with peroxides in the presence of catalyst to afford alkyl pyruvate
Implementation Method 2
in the presence of catalyst at the temperature ranging from 25-100 deg C
Data Source
AI summary
The present invention relates to a simple one step oxidative dehydrogenation process for the synthesis of alkyl pyruvate with 100% selectivity towards alkyl pyruvate comprising reacting an alkyl lactate in the presence of catalyst at the temperature ranging from 25-100° C. for the time period ranging from 5 to 40 hours in an organic solvent and hydrogen peroxide to afford alkyl pyruvate.