Dividing Wall Columns for Vapor Split Control
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Solution Overview
Problem
The TC-TC configuration of distillation columns faces operability issues due to conflicting pressure requirements, which limits its industrial application and affects product purities and total annualized costs, despite its potential for cost reduction.
Innovation Solution
The introduction of new dividing wall column configurations, such as L-TC, TC-L, and L-L, which allow for more operable control of vapor and liquid splits through strategic placement and management of vertical partitions and heat exchangers, enabling better pressure control and maintaining similar minimum heat duty requirements as the TC-TC column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the TC-TC configuration is used to reduce capital and operating costs, then cost-effectiveness is improved, but operability deteriorates due to conflicting pressure requirements
Solution Approach 1:
The column is divided into multiple zones by vertical partitions, creating separate compartments that can operate with different pressure conditions. This segmentation allows the system to maintain the cost benefits of thermal coupling while resolving pressure conflicts by isolating different pressure regimes in separate spatial zones.
Solution Approach 2:
The invention transitions from a two-column configuration to a single-column multi-zone configuration, adding the dimensional aspect of vertical partitioning. This dimensional change allows multiple pressure zones to coexist within a single pressure boundary, resolving the conflicting pressure requirements while maintaining thermal coupling benefits.
2Device complexity
If the TC-TC column is used to reduce plant space and capital costs, then device complexity is reduced, but control flexibility deteriorates due to uncontrolled vapor split
Solution Approach 1:
The invention introduces dynamic control mechanisms that allow the vapor split between zones to be adjusted during operation. By making the system dynamically controllable rather than fixed, the vapor distribution can be optimized for different operating conditions while maintaining the space-efficient single-column design.
Solution Approach 2:
Control systems with feedback mechanisms are implemented to monitor and adjust vapor flow distribution to the different zones. This feedback control enables the system to maintain optimal vapor splits under varying operating conditions, providing the necessary flexibility while preserving the capital cost advantages of the integrated column design.
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
These configurations enhance operational flexibility and efficiency, allowing for better control of vapor and liquid splits, reducing operational complications, and maintaining the cost-effectiveness of the TC-TC column while improving product purities and operational stability.
Implementation Method 1
a method for separating feed stream containing a more volatile component, at least one intermediate volatile component and a less volatile component by feeding the feed to a distillation column
Data Source
AI summary
For an n-component mixture (n≧3), an array of new distillation columns is disclosed with vertical partitions that allow independent control of the vapor flowrates in each partitioned zone, while operating the columns to produce constituent product streams. Specifically, all such more operable columns with vertical partitions for ternary and quaternary feed mixtures are illustrated. For a ternary feed, through extensive computation, the minimum heat duty for each of the new columns is same as for the FTC configuration. The new columns with vertical partitions become even more attractive when the vapor split between column sections must be controlled within a narrow range. Finally, it is disclosed how a new column with vertical partition(s) drawn for an n-component mixture can be adapted to distil feed mixtures that contain more than n-components.