Alkene Dehydrogenation Feed Cooling via Adsorber Effluent
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Solution Overview
Problem
Dehydrogenation processes for alkene production face challenges in maintaining constant physical parameters of the feed material stream due to temperature and flow fluctuations during adsorber regeneration, affecting the dehydrogenation reactor's efficiency.
Innovation Solution
A method involving a two-phase cooling process where the gas stream from the adsorber is cooled by its condensed component, with the flow volume adjusted based on the temperature of the gas stream heading to the dehydrogenation reactor, using a device with heat exchangers and a storage appliance to maintain consistent conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adsorber is regenerated to ensure sufficient drying capacity, then the drying performance is improved, but the temperature and flow amount of the dehydrogenated gas fluctuate
Solution Approach 1:
The patent applies preliminary action by pre-cooling the feed material stream using the cold gas stream from the adsorber before the adsorber regeneration completes. This anticipatory cooling compensates for the upcoming temperature fluctuations during regeneration, maintaining stable feed conditions to the dehydrogenation reactor.
Solution Approach 2:
The patent implements feedback control by monitoring the temperature and flow parameters of the dehydrogenated gas and adjusting the cooling strategy accordingly. The system uses this feedback to regulate the cooling process and maintain stable operating conditions despite adsorber regeneration fluctuations.
2Productivity
If the combined gas stream is heated via the fluid leaving the adsorber to vaporize hydrocarbons, then the vaporization is achieved, but the physical parameters of the combined gas stream become fluctuating
Solution Approach 1:
The patent applies preliminary cooling to the feed material stream using the cold adsorber effluent before mixing with the recycled gas stream. This pre-cooling action ensures that when the combined stream is subsequently heated for vaporization, the temperature rise is more controlled and the physical parameters remain more stable, as the system is less susceptible to fluctuations from the heating process.
3Stability of the object's composition
If larger heat exchangers are used to compensate for adsorber operation fluctuations, then the stability is improved, but the cost increases
Solution Approach 1:
The patent applies dynamics by making the cooling process adaptive and responsive to actual operating conditions. Rather than using oversized static heat exchangers, the system dynamically adjusts the cooling strategy based on real-time temperature and flow measurements, using control mechanisms to optimize heat exchange efficiency and maintain stability with appropriately sized equipment.
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 stabilizes the physical parameters of the feed material stream, ensuring consistent dehydrogenation reactor conditions and reducing the need for larger, more expensive heat exchangers by compensating for adsorber operation fluctuations.
Implementation Method 1
cooling a gas stream coming from an adsorber by a gas stream which comprises the feed material in a first cooling phase
Implementation Method 2
cooling the feed material in a second cooling phase by a condensed component of the gas stream coming from the adsorber
Implementation Method 3
A hydrocarbon-comprising feed material is subjected to a dehydrogenation and a product material comprising at least one alkene is generated
Data Source
AI summary
The invention relates to a method for generating an alkene, in which a hydrocarbon-comprising feed material is subjected to a dehydrogenation and a product material comprising at least one alkene is generated. A gas stream coming from an adsorber is cooled by a gas stream which comprises the feed material, and the gas stream coming from the adsorber is cooled by a condensed component of the gas stream coming from the adsorber in a first cooling phase. Feed material is cooled in a second cooling phase by a condensed component of the gas stream coming from the adsorber. The flow of the condensed component of the gas stream coming from the adsorber, fed to the first and/or second cooling phase, is varied depending on the temperature of the gas stream leaving the first cooling phase which comprises the feed material and which is fed to the dehydrogenation.