Isolation of Benzene, Toluene and Xylene Cont.....

Stripping column:

•       NFM and the dissolved aromatic solution obtained from the bottom of the extractive distillation column are fed to stripping column to recovery NFM for recycle. Column is operated along with aromatic column which operates at vacuum, pure aromatics are separated from the top and the NFM from the bottom. Heat of NFM is used to for the preheating the stream in heat exchanger system and returned to the extractive distillation column.

Equipment’s through which hot NFM is circulated:

qCenter re boiler on ED column

qReboiler on solvent recovery column.

qNFM re boiler on the stripper column

•         NFM is cooled by the trim cooler using solvent stream. Continuous reboilers are provided heat to the stripper column with BT vapours as heating medium. Solvent is removed by the reflux in the columns stripping section.
•        Total tray                                  30
•         Feed tray                                  5th
•         Top temperature                    56оC
•         Bottom temperature             119оC
•         Pressure                                 0.36 kg/cm3 vacuum