Dividing Wall Distillation for Ethanol Purification
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Solution Overview
Problem
Current ethanol purification processes are energy-intensive, complex, and costly, with lower yields due to inefficiencies in separating ethanol from water and higher alcohols in distillation columns.
Innovation Solution
Incorporating a dividing wall in the distillation column to enhance the separation of ethanol from water and higher alcohols, allowing for the collection of higher-purity streams and increasing ethanol yield by recycling impurities back into the column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional distillation columns are used for ethanol purification, then the separation process can be implemented, but energy consumption is high and ethanol yield is reduced
Solution Approach 1:
The distillation column is divided into multiple sections by dividing walls, creating separate compartments for different separation functions. This segmentation allows simultaneous separation of ethanol from water and higher alcohols in different zones, improving separation efficiency and reducing energy consumption while maintaining high ethanol yield.
Solution Approach 2:
Dividing walls are introduced as vertical partitions within the column, adding a spatial dimension to the separation process. This creates multiple parallel separation pathways within a single column, enabling more efficient mass transfer and reducing the number of theoretical stages required, thereby lowering energy consumption while improving productivity.
2Device complexity
If conventional distillation columns are used for ethanol purification, then the process can be operated, but the process complexity and investment costs increase
Solution Approach 1:
Multiple separation functions are merged into a single distillation column through the use of dividing walls. Instead of requiring multiple separate columns for different separation tasks, the divided column integrates these functions spatially, reducing overall process complexity and capital investment while maintaining separation effectiveness.
Solution Approach 2:
The dividing wall column serves multiple separation purposes simultaneously - separating ethanol from water in one zone and from higher alcohols in another zone. This multi-functionality eliminates the need for additional specialized equipment, reducing both process complexity and investment costs.
3Manufacturing precision
If conventional distillation columns are used, then ethanol can be purified, but the purity of ethanol and higher alcohols in product streams is insufficient
Solution Approach 1:
The column is segmented into distinct separation zones by dividing walls, with each zone optimized for specific component separation. This allows ethanol to be purified to high purity in one zone while higher alcohols are concentrated in another zone, simultaneously improving both product purity and yield by preventing cross-contamination.
Solution Approach 2:
Different sections of the divided column have tailored local characteristics - specific tray arrangements, flow distributions, and operating conditions optimized for separating particular component pairs. This local optimization enables high purity ethanol production while maximizing ethanol recovery in the distillate.
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 achieves higher ethanol purity and yield by efficiently separating ethanol from impurities, reducing the amount of ethanol in side streams and increasing the purity of collected higher alcohols, thus lowering energy consumption and costs.
Implementation Method 1
Distilling in a distillation column, a feed stream comprising ethanol in an amount below its azeotropic concentration, water and impurities
Data Source
AI summary
The invention relates to a process for the purification of ethanol wherein a dividing wall column is used. In particular, the invention relates to a process for the purification of a feed stream comprising ethanol and impurities such as higher alcohols. The invention further relates to the use of dividing wall in distillation column in an ethanol purification process.