Ethylene Oxide Recovery Column with Internal Baffle
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Solution Overview
Problem
Conventional ethylene oxide recovery systems require separate vessels for reabsorption and carbon dioxide stripping, leading to increased equipment complexity, floor area requirements, and safety hazards due to exposure of ethylene oxide to external fires.
Innovation Solution
A single column vessel with an internal dividing baffle separates the column into reabsorption and stripping sections, allowing for combined ethylene oxide reabsorption and carbon dioxide stripping, reducing equipment complexity and surface area, and enhancing safety by minimizing fire exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate vessels are used for reabsorption and carbon dioxide stripping, then the processes can be carried out independently, but the equipment complexity and floor area requirements increase
Solution Approach 1:
The patent combines the reabsorption column and stripper column into a single integrated vessel. The reabsorption section and stripping section are housed within one common shell, sharing supports, instrumentation, and control systems. This merging reduces the total number of vessels from two to one, simplifying equipment complexity while maintaining independent process operation through internal section separation.
Solution Approach 2:
The single integrated vessel is divided into distinct reabsorption and stripping sections using internal trays and baffles. This segmentation allows each process function to operate independently within its designated zone while sharing the common vessel structure. The internal segmentation maintains process independence without requiring separate external vessels.
2Adaptability or versatility
If separate vessels are used for reabsorption and carbon dioxide stripping, then each process can be optimized independently, but the floor area required increases
Solution Approach 1:
The patent transitions from a horizontal arrangement of separate vessels occupying floor space to a vertical arrangement where reabsorption and stripping sections are stacked one above the other within a single vessel. This dimensional change from horizontal to vertical utilization allows both processes to be optimized independently while minimizing floor area footprint.
3Reliability
If multiple separate vessels are used, then process functions are clearly separated, but the surface area requiring fireproofing increases safety hazards
Solution Approach 1:
By merging the reabsorption and stripping vessels into a single integrated structure, the total external surface area requiring fireproofing is reduced. The common vessel shell eliminates the need for separate fireproofing on multiple adjacent vessels, thereby reducing the overall fire hazard exposure while maintaining reliable process separation through internal sectioning.
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 single column vessel simplifies operations, reduces equipment size and floor area, and improves safety by integrating reabsorption and stripping functions, while maintaining efficient ethylene oxide recovery and carbon dioxide separation.
Implementation Method 1
an inlet for introducing a vapor stream comprising ethylene oxide into the reabsorption section and for reabsorbing the ethylene oxide in an absorbent
Implementation Method 2
a stripper for stripping contained carbon dioxide from the reabsorbed ethylene oxide
Data Source
AI summary
In an ethylene oxide process, the stripping and reabsorption operations, normally carried out in separate vessels, are carried out in a single vessel which is divided by a baffle into separate sections where reabsorption and stripping are carried out.