Platinum Catalyst Oxidation for Polyether Acetic Acid
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Solution Overview
Problem
Conventional methods for manufacturing polyoxyethylene alkyl ether acetic acid face issues such as instability of monochloroacetic acid, generation of inorganic salts, and decreased catalytic activity over the reaction progress, leading to low productivity and complex purification processes.
Innovation Solution
A method involving dehydrogenation and oxidation of polyoxyethylene alkyl ether in the presence of a platinum catalyst with a specific mass ratio of reactants to water, which suppresses viscosity increase and side product formation, allowing for high-yield production without inorganic salts and maintaining catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If monochloroacetic acid is used in carboxymethylation, then polyoxyethylene alkyl ether acetic acid can be produced, but monochloroacetic acid decomposes during reaction due to instability in water
Solution Approach 1:
The invention changes the reaction parameters by using a different chemical pathway (oxidation instead of carboxymethylation) and controls the water content in the liquid phase to optimize reaction conditions. This avoids the decomposition issue of monochloroacetic acid while maintaining high production efficiency
Solution Approach 2:
The invention introduces a platinum catalyst as an intermediary to facilitate the oxidation reaction. The catalyst enables the transformation of polyoxyethylene alkyl ether to polyoxyethylene alkyl ether acetic acid through oxidation, bypassing the need for unstable monochloroacetic acid
2Productivity
If carboxymethylation is used to manufacture polyoxyethylene alkyl ether acetic acid, then the product can be obtained, but a large amount of inorganic salts are generated as side products requiring removal
Solution Approach 1:
The invention converts the harmful side effect of inorganic salt generation into a benefit by using an oxidation reaction that produces water as the main byproduct instead of inorganic salts. The reaction uses oxygen or air as the oxidizing agent, transforming a potentially harmful process into a cleaner one
Solution Approach 2:
The invention extracts or eliminates the source of inorganic salts by replacing the carboxymethylation pathway with an oxidation pathway. This removes the need for base neutralization and subsequent salt removal operations
3Productivity
If alkali neutralization oxidation is used, then polyoxyethylene alkyl ether acetic acid can be produced, but carboxylic acid salt requires acid decomposition and generates large amount of inorganic salts
Solution Approach 1:
The invention extracts or eliminates the need for acid decomposition step by directly producing the free acid form through oxidation. The process design avoids forming carboxylic acid salts intermediate, thereby removing the complexity of acid decomposition and salt removal operations
Solution Approach 2:
The invention maintains continuous useful action by optimizing the reaction conditions to directly produce the desired free acid product without intermediate salt formation. The controlled water content and oxidation conditions ensure continuous production of the target compound without requiring additional purification steps
4Productivity
If non-neutralization oxidation is used, then polyoxyethylene alkyl ether acetic acid can be produced, but catalytic activity decreases in accordance with reaction progress
Solution Approach 1:
The invention changes the reaction parameters by controlling the water content in the liquid phase within a specific range (5-50 mass%). This parameter control prevents catalyst deactivation and maintains high catalytic activity throughout the reaction progress, resolving the contradiction between productivity and catalyst reliability
Solution Approach 2:
The invention implements feedback control by monitoring and adjusting the water content in the liquid phase during the reaction. This feedback mechanism ensures that the catalytic activity is maintained at optimal levels throughout the reaction process, preventing the decrease in activity that occurs in conventional non-neutralization oxidation
5Productivity
If conventional oxidation methods are used, then polyoxyethylene alkyl ether acetic acid can be produced, but viscosity increase and side product formation occur
Solution Approach 1:
The invention changes the reaction parameters by controlling the water content in the liquid phase within a specific range (5-50 mass%). This parameter control suppresses excessive viscosity increase and side product formation, maintaining stable reaction conditions and high production efficiency
Solution Approach 2:
The invention applies beforehand cushioning by pre-establishing optimal reaction conditions including controlled water content and oxygen supply. These pre-set conditions prevent excessive viscosity increase and side product formation during the reaction process, cushioning against potential problems before they occur
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 enables the production of polyoxyethylene alkyl ether acetic acid with high efficiency, eliminating the need for salt removal and concentration steps, and maintaining catalytic activity throughout the reaction, resulting in improved productivity and mild skin irritation properties for cleansing agents.
Implementation Method 1
dehydrogenating and oxidizing the polyoxyethylene alkyl ether in the presence of a platinum catalyst
Implementation Method 2
dehydrogenating and oxidizing the polyoxyethylene alkyl ether
Data Source
AI summary
The invention relates to a method for manufacturing a polyoxyethylene alkyl ether acetic acid, including feeding oxygen into a liquid phase containing polyoxyethylene ether having a hydrocarbon group at the end (hereinafter, it may also be referred to as a polyoxyethylene alkyl ether) and water, and dehydrogenating and oxidizing the polyoxyethylene alkyl ether in the presence of a platinum catalyst, in which the mass ratio between the total mass of the polyoxyethylene alkyl ether and the polyoxyethylene alkyl ether acetic acid and the mass of water in the liquid phase ((polyoxyethylene alkyl ether + polyoxyethylene alkyl ether acetic acid)/water) is 60/40 to 95/5.