NOUVEAUX DERIVES DU BENZOTHIOPHENE, LEUR PREPARATION ET LEUR UTILISATION COMME MEDICAMENTS

摘要

The heat exchanger includes a cylindrical pressure vessel in which a faller column having heat exchange surfaces and at least one riser column having further heat exchange surfaces are mounted. The riser column walls extend around the walls of the faller column. The top part of the pressure vessel is connected to a bottom part in a dis-connectable manner with the riser column walls being suspended in the bottom part. The walls of the faller column with all the heating surfaces disposed therein can be withdrawn from the space around which the riser column walls extend for servicing.