Reactive Rectification Column Weir Design for Methionine Purity
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Solution Overview
Problem
The existing production processes for methionine and 2-hydroxy-4-methylmercaptobutyric acid suffer from the accumulation of toxic unsaturated secondary components like allyl alcohol, which disrupts downstream processes, increases waste, and reduces yield due to high capital and operating costs associated with distillation for removal.
Innovation Solution
A reactive rectification column with specific design features, including a weir height of 100 mm or more, plate spacing of 500 to 1000 mm, and a method for continuous production of methionine salt, where allyl components are removed through alkaline hydrolysis combined with steam distillation in the column, effectively stripping unwanted compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to remove unsaturated secondary components like allyl alcohol from crude acrolein, then purity is improved, but capital and operating costs increase significantly
Solution Approach 1:
The patent applies preliminary action by removing unsaturated secondary components like allyl alcohol at the beginning of the process from crude acrolein, before the main reaction with methyl mercaptan occurs. This prevents accumulation of these components in downstream processes and eliminates the need for expensive distillation operations later, thereby achieving purification without significant capital and operating cost increases.
2Productivity
If crude acrolein is not purified before reaction with methyl mercaptan, then productivity is maintained, but toxic unsaturated components accumulate and disrupt downstream processes
Solution Approach 1:
The patent applies the extraction principle by selectively removing unsaturated secondary components like allyl alcohol from crude acrolein at the beginning of the process. This extraction step eliminates the harmful components that would otherwise accumulate and disrupt downstream processes, thereby maintaining both high productivity and reliable downstream process operation without requiring complete purification of the crude acrolein.
3Manufacturing precision
If activated carbon is used to remove accumulated impurities, then purity is improved, but service life is reduced and waste increases
Solution Approach 1:
The patent applies preliminary anti-action by removing unsaturated secondary components like allyl alcohol at the very beginning of the process from crude acrolein, before they can accumulate and contaminate the activated carbon. This prevents the activated carbon from becoming saturated with impurities, thereby extending its service life, reducing waste, and eliminating the need for frequent replacement while maintaining high product purity.
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 allows for the efficient removal of unsaturated secondary components, reducing toxicity, extending activated carbon service life, minimizing waste, and maintaining high process reliability while optimizing acrolein yield and plant availability.
Implementation Method 1
allyl components are removed through alkaline hydrolysis combined with steam distillation in the column, effectively stripping unwanted compounds
Implementation Method 2
reacting 5-(2-methylmercaptoethyl)hydantoin with an alkaline circulating solution to produce a methionine salt
Data Source
AI summary
A reactive rectification column suitable for the production of 2-hydroxy-4-methylmercaptobutyric acid and/or methionine contains a weir having a height of 100 mm or more.