Catalyst Fine Separation in Oxygenate to Olefins Systems
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Solution Overview
Problem
Catalyst particles, particularly fine particles, are lost from oxygenate to olefins reaction systems, leading to contamination in olefin product and regenerator flue gas streams, which reduces efficiency and increases downstream pollution.
Innovation Solution
A two-step process involving cyclone separation in the regenerator and electrostatic or wet gas scrubber separation to remove catalyst particles from the flue gas stream, ensuring a significant reduction in catalyst loading to minimize contamination and enhance system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalyst particles are used in the oxygenate to olefins reaction system, then conversion efficiency is improved, but fine catalyst particles are lost through the system causing contamination in product and flue gas streams
Solution Approach 1:
The catalyst particle removal system is segmented into multiple stages: a first separation stage (cyclone separator) for coarse particles and a second separation stage (electrostatic precipitator) for fine particles. This segmentation allows each stage to target specific particle sizes, effectively removing fine catalyst particles while maintaining conversion efficiency.
Solution Approach 2:
The patent extracts and removes catalyst particles from the gas streams using specialized separation equipment. The cyclone separator extracts coarse particles, and the electrostatic precipitator extracts fine particles, preventing them from contaminating the olefin product and flue gas streams while maintaining the catalyst's conversion efficiency.
2Object-affected harmful factors
If catalyst particles are removed from the system, then downstream contamination is minimized, but separation equipment complexity increases
Solution Approach 1:
The separation system is divided into two distinct units: a cyclone separator for coarse particles and an electrostatic precipitator for fine particles. This segmentation allows each unit to be optimized for its specific function, managing contamination effectively while keeping individual equipment designs relatively simple and well-understood.
Solution Approach 2:
The patent introduces an intermediary electrostatic precipitator unit between the cyclone separator and the product streams. This intermediary device specifically targets fine catalyst particles that escape the cyclone separator, providing an additional layer of protection against downstream contamination without requiring complete system redesign.
3Device complexity
If fine catalyst particles are not removed, then system simplicity is maintained, but catalyst resistivity increases and separation efficiency decreases
Solution Approach 1:
The patent replaces purely mechanical separation (cyclone separator) with an electrostatic separation mechanism (electrostatic precipitator) for fine particles. This substitution allows more effective removal of fine catalyst particles that would otherwise increase resistivity, while the electrostatic mechanism is a well-established technology that maintains operational simplicity.
Solution Approach 2:
The electrostatic precipitator operates by changing the electrical parameters of the fine catalyst particles, charging them and directing them to collection plates. This parameter change enables effective separation of fine particles that cannot be removed by mechanical means alone, maintaining catalyst performance while managing particle removal efficiency.
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
The process effectively reduces catalyst loss in olefin product and regenerator flue gas streams, minimizing downstream contamination and improving the overall efficiency of the oxygenate to olefins reaction system by maintaining lower catalyst resistivities and optimizing separation efficiency.
Implementation Method 1
the catalyst is separated in the regenerator using a cyclone separation system
Implementation Method 2
the catalyst fine separation unit is an electrostatic precipitator
Data Source
AI summary
This invention provides a process for limiting the loss of catalyst particles through olefin product streams and regenerator flue gas streams exiting the reaction system. In particular, this invention provides for removing catalyst particles from the reactor using a water stream and from the regenerator using a two step separation process. The two step process involves the use of a catalyst fine separation unit.