1.By gravity we can discharge distillate from second receiver after releasing vacuum but available height is only 1.6 to 1.8 meter this height is not sufficent to discharge distillate directly to main solvent tank 
2. Baroleg…which require height of 10 m for 20 mm Hg vacuum and 5 m for 300 mm Hg vacuum. Plus some additional height for pressure drop due to bends, etc. By Barolegs it is possible to discharge liquid under vacuum but  this option is not feasible for us.