Abstract
This work presents the retrofit design of an industrial N, N-dimethylformamid (DMF)-water separation system originally consisting of three heat-integrated distillation columns. Our task was to examine how the capacity of the separation system could be increased by 42.8%. If necessary an unused on-site extra distillation column was available for the project. The performance of the existing distillation system and of various increased-capacity structures have been studied using rigorous process simulation. Our study shows that the required capacity increase can be attained by adding the extra distillation column only when replacing the column internals of the original columns and when installing a new structured packing also into the available extra column. Replacing the column internals is expected to result in better controllability, too.
Highlights
N,N-dimethylformamid (DMF) is a well known solvent of many hydrophobic organic compounds
The solvent spinning process that is used for the production of polyamide fibers uses large amounts of DMF
The top product of the vacuum column is pure water; the bottom product enriched in DMF is fed into the second column that is operated at atmospheric pressure
Summary
N,N-dimethylformamid (DMF) is a well known solvent of many hydrophobic organic compounds. The solvent spinning process that is used for the production of polyamide fibers uses large amounts of DMF. The DMF and the water constitute an ideal mixture and could be separated in a single distillation column, in the industrial practice usually a two-column heat integrated sequence is used for the separation. The top product of the vacuum column is pure water; the bottom product enriched in DMF is fed into the second column that is operated at atmospheric pressure. The condenser of the atmospheric column and the reboiler of the vacuum column are replaced by a single heat exchanger. This arrangement is called direct distillation sequence with backward heat integration. Annakou and Mizsey [1] found that heat-integrated sequences are always more economic than the conventional direct or indirect separation sequences
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