Continuous Hydrogenation Apparatus Thermal Control
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Solution Overview
Problem
Current hydrogenation processes at industrial scale face challenges in achieving sufficient process control, particularly thermal control, hydrogen stoichiometry, and mass transfer, which are crucial for producing sensitive and complex chemical intermediates needed in the pharmaceutical industry, due to the requirements of high pressures and temperatures and the limitations of trickle-bed reactors.
Innovation Solution
A continuous hydrogenation process using a packed bed reactor that approximates to an adiabatic process, followed by rapid cooling, with precise control of hydrogen stoichiometry achieved by mixing liquid and hydrogen gas streams before transfer to the reactor, and utilizing catalysts with smaller particle sizes to enhance surface area and mass transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If supercritical conditions are used for hydrogenation, then hydrogen miscibility and reaction efficiency are improved, but apparatus complexity and operational risk significantly increase
Solution Approach 1:
The patent changes the physical state parameters of hydrogen from supercritical conditions to dissolved gas phase in a liquid solvent. By dissolving hydrogen in the liquid phase before introducing it to the reactor, the invention achieves high hydrogen concentration and reaction efficiency without requiring supercritical equipment, thus resolving the contradiction between productivity and device complexity
Solution Approach 2:
The patent introduces a liquid solvent as an intermediary carrier to transport hydrogen to the reaction site. Instead of directly using supercritical hydrogen or gaseous hydrogen, the hydrogen is first dissolved in the liquid phase, which acts as a mediator to achieve both high hydrogen delivery and simplified equipment requirements
2Quantity of substance
If supercritical conditions are used for hydrogenation, then hydrogen delivery to reaction site is improved, but operational risk and production costs significantly increase
Solution Approach 1:
The patent changes hydrogen delivery from supercritical phase to dissolved gas phase in liquid solvent. This parameter change maintains high hydrogen concentration (improving quantity of substance) while operating at moderate temperatures and pressures, thereby significantly reducing operational risk and production costs
3Productivity
If trickle-bed reactors are used for industrial scale hydrogenation, then production capacity is improved, but thermal control and process control become insufficient
Solution Approach 1:
The patent segments the reaction process into two distinct stages: (1) hydrogen dissolution in liquid phase with heat exchange, and (2) catalytic hydrogenation in packed bed reactor. This segmentation allows independent optimization of thermal control in the first stage and reaction efficiency in the second stage, achieving both high productivity and precise thermal control
Solution Approach 2:
The liquid solvent serves as an intermediary that facilitates both mass transfer of hydrogen and thermal management. The solvent absorbs and transports heat away from the reaction zone, providing effective thermal control while maintaining high production capacity
4Stress or pressure
If larger catalyst particles are used in packed bed reactor, then pressure drop is reduced, but mass transfer efficiency decreases
Solution Approach 1:
The patent changes the phase state of hydrogen from gas to dissolved state in liquid solvent before entering the packed bed reactor. This parameter change eliminates gas-liquid mass transfer resistance, allowing the use of larger catalyst particles with high void fractions that reduce pressure drop while maintaining excellent mass transfer efficiency through the liquid phase
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 enables the commercial manufacture of thermally sensitive chemical intermediates by maintaining precise temperature control and optimizing hydrogen utilization, thereby overcoming the limitations of traditional methods and ensuring efficient production.
Implementation Method 1
transferred into a packed bed hydrogenation reactor to effect hydrogenation. The reactor comprises a packed bed comprising catalyst particles
Implementation Method 2
transferred from the reactor to a heat exchanger for rapid cooling
Implementation Method 3
continuous hydrogenation process suitable for homogeneous and heterogeneous catalytic hydrogenation at commercial scale with enhanced process control, in particular thermal control
Data Source
AI summary
Hydrogenation Process and Apparatus. The present invention relates to a continuous flow hydrogenation process and process apparatus.