Propane Dehydrogenation via Circulating Catalyst Regeneration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of propylene faces a growing demand-supply gap, and existing methods, such as cracking of heavier hydrocarbons and methanol to olefins, are inefficient and require costly catalyst regeneration due to coke buildup, necessitating a more efficient direct conversion process.
Innovation Solution
A process involving a dehydrogenation reactor with a circulating catalyst stream, where propane-rich feedstocks are preheated and dehydrogenated to produce propylene, with continuous catalyst regeneration and recycling, eliminating the need for external hydrogen and depropanizer in some cases, using a non-noble metal catalyst like metal oxide stabilized zirconia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking or pyrolysis of hydrocarbons is used to produce ethylene and propylene, then light olefins can be produced, but the process is complex and requires costly catalyst regeneration due to coke buildup
Solution Approach 1:
The patent extracts and eliminates the depropanizer unit from the traditional steam cracking process by implementing direct propane dehydrogenation. This removes the complex separation steps required in conventional processes while maintaining high propylene production efficiency through selective catalytic dehydrogenation of propane feedstock
Solution Approach 2:
The circulating catalyst system performs multiple functions simultaneously: it catalyzes propane dehydrogenation, enables continuous regeneration through coke burn-off, and provides heat transfer for process thermal management. This multi-functional catalyst system replaces multiple separate process units, simplifying the overall process while maintaining productivity
2Productivity
If conventional cracking processes are used, then light olefins can be produced, but energy costs and capital costs are high
Solution Approach 1:
The patent changes the operating parameters from high-temperature steam cracking to controlled-catalytic dehydrogenation at lower temperatures. The circulating catalyst system enables operation at temperatures that reduce energy input requirements while maintaining high propylene yields through enhanced reaction selectivity and continuous catalyst regeneration that prevents deactivation
Solution Approach 2:
The continuous circulation and regeneration of the catalyst system eliminates idle time and maintains continuous productive action. The catalyst is continuously regenerated in-situ through coke burn-off, ensuring uninterrupted propane conversion to propylene and eliminating the energy losses associated with batch processing and catalyst replacement
3Productivity
If catalyst is used for propane dehydrogenation, then propylene production efficiency increases, but coke buildup requires costly and complex regeneration
Solution Approach 1:
The catalyst system performs self-service regeneration through continuous circulation between the reactor and regenerator. The spent catalyst automatically undergoes coke burn-off in the regenerator and is then returned to the reactor, eliminating the need for external regeneration operations, costly catalyst replacements, or complex shutdown procedures
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 enhances propylene production efficiency by reducing energy and capital costs, maintaining catalyst performance through continuous regeneration, and achieving high propylene yields without requiring external hydrogen or additional separation steps.
Implementation Method 1
The reactor has a circulating catalyst stream... In the reactor the propane rich hydrocarbon stream is dehydrogenated to create an intermediate process stream having propylene
Implementation Method 2
The dried feedstream is preheated through a heat exchanger to preheat the feed to the reactor temperature
Implementation Method 3
The spent catalyst is heated in a combustion zone of the regenerator to burn off carbon deposits on the catalyst with an oxidizing gas and fuel
Implementation Method 4
burn off carbon deposits on the catalyst with an oxidizing gas
Implementation Method 5
The reactor has a circulating catalyst stream... The spent catalyst is passed to a regeneration unit
Data Source
AI summary
A process for the production of propylene from a propane rich hydrocarbon source is presented. The process converts a propane rich stream and uses less equipment and energy for the separation and production of propylene. The process uses a non-noble metal catalyst and utilizes a continuous reactor-regeneration system to keep the process on line for longer periods between maintenance.