Micro-Reactor Epoxidation Process for High-Quality Fatty Acid Esters
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Solution Overview
Problem
Current methods for preparing high-quality epoxidized fatty acid ester face issues such as inaccurate temperature control, low selectivity, low safety level, slow epoxidation rate, and the need for new catalysts, particularly due to the use of sulfuric acid and complex processes.
Innovation Solution
A method using a micro-reaction device where an aqueous hydrogen peroxide solution and a carboxylic acid are mixed and reacted in a first micro-reactor, then combined with an unsaturated fatty acid ester in a second micro-reactor, with controlled temperatures and residence times to produce high-quality epoxidized fatty acid ester without the need for new catalysts, reducing waste and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfuric acid is used as catalyst in traditional batch production, then the epoxidation reaction can proceed, but the product quality is poor and serious pollution is caused
Solution Approach 1:
The patent changes the catalyst system from traditional sulfuric acid to a combination of formic acid and hydrogen peroxide, operating at different concentration parameters (formic acid 10-30%, hydrogen peroxide 5-20%) to achieve both high product quality and reduced pollution. This parameter change eliminates the harmful effects of sulfuric acid while maintaining reaction effectiveness.
Solution Approach 2:
The patent extracts and eliminates the harmful sulfuric acid catalyst from the traditional process, replacing it with environmentally benign formic acid and hydrogen peroxide. This removal of the harmful element directly addresses the pollution problem while the new catalyst system maintains or improves product quality.
2Productivity
If traditional batch production process is used, then production can be carried out with simple equipment, but the production is unstable and power consumption is high
Solution Approach 1:
The patent transitions from discontinuous batch production to continuous micro-reactor processing. The micro-reactor system enables continuous flow reaction where reactants continuously enter, react, and exit, eliminating the start-stop nature of batch processes. This continuity improves production stability and reduces energy consumption by maintaining steady-state operation.
Solution Approach 2:
The patent segments the traditional single batch reactor into multiple micro-reactors connected in series. This segmentation allows for better control of reaction parameters, improved heat and mass transfer, and more stable continuous production. The modular micro-reactor design enables scalable production with consistent quality.
3Object-generated harmful factors
If new catalysts such as sulfonic acids, solid superacids, or enzyme catalysts are used, then corrosivity and side reactions are reduced, but the cost is high and reaction conditions are harsh
Solution Approach 1:
The patent uses formic acid and hydrogen peroxide as catalysts and oxidants, which are inexpensive, readily available chemicals that can be easily replenished. Unlike expensive enzyme catalysts or complex solid superacids, these reagents are cheap and can be continuously supplied, simplifying the overall process economics and reducing the complexity of catalyst management.
Solution Approach 2:
The patent optimizes the concentration parameters of formic acid (10-30%) and hydrogen peroxide (5-20%) to achieve effective catalysis and oxidation without requiring harsh reaction conditions. By carefully controlling these parameters in the micro-reactor system, the patent reduces corrosivity and side reactions while maintaining simple, manageable reaction conditions.
4Productivity
If micro-reaction device is used for continuous production, then productivity and safety are improved, but the device complexity increases
Solution Approach 1:
The patent employs multiple micro-reactors connected in series rather than a single complex reactor. This segmentation allows each micro-reactor to perform a specific function (catalysis, oxidation, mixing) with optimized parameters, while the overall system achieves continuous production. The modular design makes the complex functionality more manageable and scalable.
Solution Approach 2:
The micro-reactor system is designed to perform multiple functions within an integrated continuous flow platform: mixing, catalysis, oxidation, and product formation all occur in the micro-reactor sequence. This multi-functionality achieves continuous production capability without requiring separate equipment for each step, thereby limiting the increase in overall device 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 achieves high selectivity, safety, and continuous production of high-quality epoxidized fatty acid ester with high epoxy values, eliminating the need for new catalysts and minimizing waste, while avoiding ring-opening reactions.
Implementation Method 1
an aqueous hydrogen peroxide solution and a carboxylic acid are mixed and reacted in a first micro-reactor
Implementation Method 2
combined with an unsaturated fatty acid ester in a second micro-reactor, with controlled temperatures and residence times to produce high-quality epoxidized fatty acid ester
Data Source
AI summary
A method for preparing a high-quality epoxidized fatty acid ester with a micro-reaction device, including: respectively pumping an aqueous hydrogen peroxide solution and a carboxylic acid at the same time into a first micro-mixer; after the reaction in the first micro-reactor, respectively pumping the output material and an unsaturated fatty acid ester into a second micro-mixer;completely mixing them and then introducing the mixture into a second micro-reactor; and after a complete reaction, water-rinsing the organic phase part of the resultant reaction liquid and drying the same to obtain the epoxidized fatty acid ester.