Multi-Wall Distillation Column for High-Purity Separation
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Solution Overview
Problem
Dividing wall column technology faces challenges in achieving theoretical efficiency due to pressure balance issues and limited capability in producing multiple high-purity products, particularly in configurations with multiple partitions and varying boiling ranges.
Innovation Solution
The implementation of a distillation column with multiple dividing walls allows for the separation of a feed into multiple products by creating distinct volumes with controlled liquid and vapor splits, using temperature differentials and varying packing types and sizes to optimize separation efficiency and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple dividing walls are used to create distinct volumes for multiple product withdrawals, then the number of high-purity products increases, but the pressure balance within the column becomes more difficult to maintain
Solution Approach 1:
The column is divided into multiple distinct volumes by multiple dividing walls, with each volume capable of producing a separate high-purity product stream. This segmentation allows independent optimization of each product zone while maintaining overall system functionality
Solution Approach 2:
Different sections of the column are designed with locally optimized properties, including varying packing types and sizes in different tower sections, allowing each region to be tailored for its specific separation requirements while contributing to overall pressure balance
2Manufacturing precision
If dividing walls are configured to optimize separation efficiency, then product purity increases, but the equipment footprint and complexity increase
Solution Approach 1:
Multiple distillation separations that would traditionally require separate columns are merged into a single integrated dividing wall column structure, reducing overall equipment footprint while achieving multiple high-purity product streams through strategic placement of dividing walls
Solution Approach 2:
The dividing walls extend vertically through the column, creating distinct three-dimensional volumes that allow multiple product withdrawals at different heights and locations, effectively utilizing the vertical dimension to increase productivity without proportionally increasing footprint
3Productivity
If the cross-sectional area of dividing wall portions is varied to achieve desired gas mass flow ratios, then separation efficiency improves, but the structural complexity of the dividing walls increases
Solution Approach 1:
The dividing walls are designed with asymmetric cross-sectional areas at different heights, creating varying flow areas that optimize gas mass flow distribution to different product zones. This asymmetric geometry allows tailored vapor-liquid equilibrium conditions in each section for improved separation 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
This approach enables the production of multiple high-purity products while minimizing energy consumption and equipment footprint, maintaining efficient vapor flow splits and hydraulic capacity across varying feed rates and compositions.
Implementation Method 1
Distillation columns or towers are one of the commonly found structures in a refinery setting. Distillation columns are used for separation of multiple product streams from an input stream
Implementation Method 2
separation of products having adjacent, nearby, and/or overlapping boiling ranges
Data Source
AI summary
Systems and methods are provided for separating a feedstock into a plurality of separation products using dividing wall column technology that includes a plurality of dividing walls. Including a plurality of dividing walls in the column can provide reduced energy consumption and reduced equipment footprint for production of a plurality of high purity distillation products. The systems and methods can allow for separation of a large number of products from a feed while having a reduced or minimized number of liquid splits and/or vapor splits.