Amine Selectivity in Gas Phase Pressure Separator
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Solution Overview
Problem
Existing processes for producing amines from primary alcohols face challenges in achieving high conversion, yield, selectivity, and efficient separation of pyrrolidine and bis(pyrrolidino)butane, with previous methods limited by temperature settings in pressure separators.
Innovation Solution
A continuous process involving the reaction of primary or secondary alcohols with ammonia in the gas phase using a heterogeneous hydrogenation catalyst, where the temperature in the pressure separator is maintained above 20°C, preferably between 30°C to 70°C, to enhance amine selectivity and facilitate efficient separation of pyrrolidine and bis(pyrrolidino)butane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the temperature in the pressure separator is maintained at or below 20°C as taught in prior art, then the separation process is simplified, but the amine selectivity and yield are reduced
Solution Approach 1:
The patent changes the temperature parameter in the pressure separator from the conventional ≤20°C to >20°C (specifically 21-70°C). This parameter change resolves the contradiction by simultaneously improving amine selectivity and yield while maintaining a feasible separation process. The unexpected positive effect of higher temperature on selectivity was discovered through systematic parameter optimization.
2Productivity
If the temperature in the pressure separator is increased above 20°C, then amine selectivity and yield are improved, but the separation process becomes more complex
Solution Approach 1:
By optimizing the temperature parameter within a specific range (21-70°C), the patent achieves high productivity through improved amine selectivity and space-time yield. The parameter change resolves the contradiction by finding an optimal operating window that enhances production efficiency while the temperature control system manages the increased process complexity.
3Quantity of substance
If conventional temperature settings (10°C or 20°C) are used in the pressure separator, then the process is easy to operate, but the conversion and yield are limited
Solution Approach 1:
The patent raises the temperature parameter from conventional 10-20°C to >20°C (21-70°C), which significantly improves amine yield and conversion. This parameter change resolves the contradiction by achieving higher productivity while the temperature control system manages the operational complexity through maintained isothermal conditions.
4Reliability
If isothermal gas phase synthesis is used, then safety and efficiency are improved, but the separation of pyrrolidine and bis(pyrrolidino)butane becomes more challenging
Solution Approach 1:
By optimizing the pressure separator temperature to >20°C (21-70°C), the patent improves product separation and achieves high purity of pyrrolidine and bis(pyrrolidino)butane. This parameter change resolves the contradiction by simultaneously maintaining the safety advantages of isothermal gas phase synthesis while enhancing separation efficiency through temperature optimization.
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 process significantly increases amine selectivity and yield, allowing for high-purity separation of pyrrolidine and bis(pyrrolidino)butane, with improved safety and efficiency compared to liquid phase or non-isothermal gas phase synthesis.
Implementation Method 1
reacting a primary or secondary alcohol with ammonia in the presence of hydrogen and a heterogeneous hydrogenation catalyst in the gas phase
Implementation Method 2
the reaction mixture is cooled to 10° C. and fed into a pressure separator
Data Source
AI summary
A process for the continuous production of amines, the process comprising reacting a primary or secondary alcohol with ammonia in the presence of hydrogen and a heterogeneous hydrogenation catalyst in the gas phase using a recycle gas mode, wherein the temperature in the pressure separator is >20° C.