Methionine Production Ammonia Adjustment Unit
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Solution Overview
Problem
Conventional methods for producing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN) result in significant ammonium sulfate formation and biphasic mixtures, leading to increased production costs, raw material loss, and complex waste treatment processes.
Innovation Solution
A method that adjusts the ammonia content in the hydrogen cyanide process gas mixture from the Andrussow process to between 20% and 60% v/v, allowing partial ammonia removal through scrubbing, thereby reducing ammonium sulfate formation and avoiding biphasic mixtures by using an ammonia adjustment unit in the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to produce MMP-CN from HCN process gas mixture, then the synthesis of MMP-CN can proceed, but significant ammonium sulfate formation occurs and biphasic mixtures are generated
Solution Approach 1:
The patent applies parameter changes by adjusting the ammonia content in the HCN process gas mixture to a specific range (20-60% of original ammonia content). This modification of the chemical composition parameter transforms the reaction outcome, preventing ammonium sulfate formation and eliminating biphasic mixture generation while maintaining MMP-CN synthesis efficiency.
2Device complexity
If ammonia is not removed from HCN process gas, then the synthesis process is simpler, but ammonium sulfate is formed in significant amounts
Solution Approach 1:
Instead of complete ammonia removal or no removal, the patent finds an optimal intermediate parameter range (20-60% of original ammonia content) that balances process simplicity with product quality. This parameter optimization prevents ammonium sulfate formation while avoiding complex removal equipment.
3Object-generated harmful factors
If complete ammonia removal is implemented, then ammonium sulfate formation is prevented, but the process becomes more complex and costly
Solution Approach 1:
The patent replaces complex ammonia removal equipment with a simpler approach: adjusting the ammonia content parameter of the input gas mixture to an optimal range. This parameter control method achieves the same goal (preventing ammonium sulfate) without requiring sophisticated removal infrastructure.
4Ease of operation
If the ammonia content in HCN process gas is not adjusted, then the process is straightforward, but biphasic mixtures are formed requiring complex waste treatment
Solution Approach 1:
The patent modifies the ammonia content parameter of the HCN process gas to a specific range before synthesis. This parameter adjustment prevents biphasic mixture formation during the reaction, eliminating the need for complex separation and waste treatment operations while maintaining ease of operation.
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 approach reduces ammonium sulfate production, eliminates biphasic mixtures, and enhances the flexibility of the MMP-CN process, improving logistical and economic aspects of methionine production by stabilizing the product and allowing for efficient storage and further processing.
Implementation Method 1
adjusting the amount of ammonia in the crude HCN process gas to between 20% (v/v) and 60% (v/v) of the amount of ammonia in the crude HCN process gas mixture
Data Source
AI summary
The present invention pertains to a method for producing methionine or salts or derivatives thereof from hydrogen cyanide (HCN), the method comprising a step of producing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN), or a crude product mixture comprising MMP-CN, by contacting a hydrogen cyanide (HCN) process gas mixture prepared according to the Andrussow process from methane, ammonia and oxygen, with 3-methylmercaptopropionaldehyde (MMP), wherein the HCN process gas mixture is obtained from the crude HCN process gas mixture by adjusting the amount of ammonia to between 20% (v/v) and 60% (v/v) of the amount of the ammonia in the crude HCN process gas mixture.