Acrylamide Production via Enzymatic Hydration and Impurity Removal
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Solution Overview
Problem
Conventional methods for producing acrylamide using nitrile hydratase catalysts face decreased productivity and insufficient removal of impurities inhibiting catalytic action, leading to suboptimal quality of acrylamide and acrylamide-based polymers, particularly in terms of molecular weight and water solubility.
Innovation Solution
Reducing the concentration of acrolein in acrylonitrile to 1 ppm or less by passing it through an ion-exchange resin column and using a microbial cell containing nitrile hydratase as a catalyst, while maintaining low concentrations of hydrocyanic acid and oxazole, to enhance catalytic activity and polymer quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acrylonitrile is used directly without purification, then the production process is simple, but impurities inhibit the catalytic action of nitrile hydratase and decrease productivity
Solution Approach 1:
The invention applies preliminary action by removing impurities from acrylonitrile before the hydration reaction. Specifically, acrolein is removed by passing acrylonitrile through an ion-exchange resin column (wa-20 type) prior to enzymatic conversion, ensuring the substrate is purified in advance to protect the nitrile hydratase catalyst from inhibition and maintain high productivity throughout the reaction process.
2Productivity
If conventional chemical hydration methods are used, then the process is well-established, but conversion and selectivity are lower compared to enzymatic methods
Solution Approach 1:
The invention replaces the conventional chemical hydration mechanism (using metallic copper catalysts) with an enzymatic mechanism (nitrile hydratase). This substitution achieves superior conversion and selectivity because the enzyme operates under milder conditions with higher specificity, converting acrylonitrile to acrylamide with excellent selectivity without the side reactions typical of chemical catalysts.
Solution Approach 2:
The invention changes the reaction parameters by using enzymatic catalysis instead of chemical catalysis. The reaction is conducted in aqueous medium at moderate temperatures with pH control, creating optimal conditions for nitrile hydratase activity. These parameter changes enable high conversion and selectivity that cannot be achieved with conventional chemical methods.
3Manufacturing precision
If acrylamide quality is not optimized, then production cost is lower, but polymer quality (hue, solubility, molecular weight) is insufficient for high-value applications
Solution Approach 1:
The invention applies preliminary anti-action by removing acrolein impurities before they can cause harm during polymerization. Acrolein is a known inhibitor that causes yellowing and reduces polymer quality; by removing it in advance through ion-exchange purification, the subsequent polymerization produces acrylamide-based polymers with excellent hue, water solubility, and molecular weight characteristics suitable for high-value applications.
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 efficiently produces high-quality acrylamide with improved balance of water solubility and molecular weight, resulting in acrylamide-based polymers that are excellent in hue and quality, suitable for applications like flocculants and paper additives.
Implementation Method 1
acrylonitrile is passed through an ion-exchange resin column having primary and/or secondary amino groups and that has been washed with water, thereby obtaining an acrylonitrile having an acrolein concentration of 1 ppm or less
Implementation Method 2
The production method is known to have benefits such as a high conversion and a high selectivity from the nitrile compound to the corresponding amide compound, compared to the conventionalscientific methods
Implementation Method 3
nitrile hydratases having a nitrile hydration activity capable of converting a nitrile group into an amide group through hydration
Data Source
AI summary
[PROBLEMS] The present invention provides a method for efficiently producing a corresponding amide compound from a nitrile compound by a reaction using a nitrile hydratase and a method for producing an amide-based polymer excellent in quality from the amide compound. In addition, the present invention provides a method for more efficiently producing an acrylamide with higher quality by a microbial catalyst containing a nitrile hydratase and the like and a method for producing an acrylamide-based polymer, which is excellent in hue, has a good balance between the water solubility and the high molecular weight and is also excellent in quality, by using the acrylamide.