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Batch distillation employing cyclic rectification and stripping operations.

Hunter R Flodman¹, Delmar C Timm

¹Department of Chemical and Biomolecular Engineering, University of Nebraska, Lincoln, NE 68588-0643, USA.

ISA Transactions

|January 21, 2012

Summary

Cyclic batch distillation using rectification and stripping modes enhances efficiency. This novel approach saves energy and time for binary fractionations compared to traditional methods.

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Area of Science:

Chemical Engineering
Separation Processes

Background:

Batch distillation is crucial for chemical separations.
Improving operating efficiency in batch distillation is an ongoing challenge.
Conventional batch rectification and inverted batch stripping have limitations.

Purpose of the Study:

To introduce and evaluate a cyclic batch distillation strategy.
To enhance operating efficiency and product flow rates.
To maintain constant product purity specifications.

Main Methods:

Cyclically alternating between batch rectification and inverted batch stripping modes.
Implementing process controls to vary the operating line slope.
Fractionating a binary mixture of ethanol and 1-propanol.

Main Results:

Achieved high product flow rates.
Demonstrated energy and time savings.
Successfully maintained constant product purity.

Conclusions:

The proposed cyclic batch distillation strategy is more efficient than conventional methods.
This method offers significant advantages for binary fractionations.
The strategy is viable for industrial applications.