Distillation Column Bottom Partition for Ethylene Recovery
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Solution Overview
Problem
The existing separation systems in ethylene oligomerization processes face issues with plugging due to polymers and reduced recovery of unreacted ethylene, leading to financial losses and inefficiencies.
Innovation Solution
A separation system with a distillation column featuring a partitioned bottom area, a reboiler, and a condenser, utilizing a separation wall with openings and a specific sump structure to separate and recycle unreacted ethylene, preventing plugging and enhancing recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactor effluent is directly injected into a feed stage tray, then the plugging phenomenon due to polymer is severe, but if injected into reboiler section, then plugging is avoided but unreacted ethylene separation efficiency is greatly reduced
Solution Approach 1:
The bottom area of the distillation column is divided into a first area (low-temperature liquid area) and a second area (high-temperature liquid area) using a first separation wall. This segmentation allows the reactor effluent to be introduced into the low-temperature area, enabling partial condensation and separation of unreacted ethylene while avoiding direct injection into the reboiler section, thus preventing plugging and improving ethylene recovery simultaneously
Solution Approach 2:
A sump structure with a separation wall containing an opening serves as an intermediary between the feed stage and the reboiler section. The separation wall with its opening allows controlled interaction between the low-temperature liquid area and high-temperature liquid area, enabling ethylene separation while maintaining smooth reboiler recirculation and preventing plugging
2Reliability
If the feed stage tray becomes the reboiler section to avoid plugging, then polymer plugging is prevented, but the separation efficiency of unreacted ethylene is greatly reduced causing material loss
Solution Approach 1:
The bottom area is segmented into two distinct zones with different temperatures and functions. The first area maintains lower temperature for ethylene condensation and separation, while the second area maintains higher temperature for reboiler operation. This segmentation preserves both plugging prevention and high ethylene recovery efficiency
Solution Approach 2:
Different regions of the bottom area are assigned different thermal conditions and functional characteristics. The first area operates at lower temperature to facilitate ethylene separation, while the second area operates at higher temperature for effective reboiling. This local differentiation of conditions enables simultaneous achievement of plugging prevention and high productivity
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 system effectively prevents plugging and recovers unreacted ethylene, improving separation efficiency and reducing raw material loss, thereby enhancing economic efficiency.
Implementation Method 1
the flowability can be formed by the temperature difference between the low-temperature liquid area and the high-temperature liquid area, so it is possible to more smooth the reboiler recirculation
Implementation Method 2
a distillation column with a separation wall, a reboiler, and a condenser
Data Source
AI summary
A separation system may include a distillation column with a separation wall, a reboiler, and a condenser. The separation system may improves separation efficiency by changing a structure of a bottom area of a distillation column in an oligomerization process to improve a circulation system.