A/C-Path Modification

Since this type of column sequence needs 6 heat exchangers, other alternative sequences must be found so that the energy requirement can be lowered. Plus this A/C-Path also uses 3 columns which means not only operating cost is higher than other sequences, its capital cost is relatively higher as well. There are two alternatives available:

A/C-path: 6 heat exchangers and 3 columns

First modification: 4 heat exchangers and 2 columns (simply coupling two columns). This arrangement is superior to A/C-path.

Second modification: 3 heat exchangers and 2 columns (with side rectifying and side stripping). This sequence is superior to the first modification.