Staged heat and mass transfer applications

A system for recovering steam vent from a deaerator comprising of:

• a deaerator vent recovery unit, said unit further comprises at least one direct contact heat transfer zone for quenching and at least one mass transfer zone for stripping, said at least one direct contact heat transfer zone is located above said at least one direct contact mass transfer zone, operating in series, separated by a movable boundary, said boundary is movable within the deaerator vent recovery unit to adjust said quenching and said stripping,
• means for providing at least one liquid stream to the deaerator vent recovery unit, said at least one liquid stream to the deaerator vent recovery unit enables quenching,
• means for providing at least one vapor stream to the deaerator vent recovery unit, said at least one vapor stream to the deaerator vent recovery unit enables stripping,
• means for maximizing temperature profile across the deaerator vent recovery unit,
• to effect migration of condensable components from the at least one vapor stream to the at least one liquid stream before discharging as liquid stream effluent, and migration of soluble components from the at least one liquid stream to the at least one vapor stream before discharging as vent stream and,
• means for removing said liquid stream effluent from the deaerator vent recovery unit,
• means for removing said vent stream from the deaerator vent recovery unit,