Condenser:
• All the gaseous mixture from the scrubber is fed to the condenser to condense aromatic ....liquids.
• The stream leaving the condenser, the aromatics are in liquid form, whereas, hydrogen and other hydrocarbons are in gaseous form.
(g) Separator:
• This unit separate aromatic liquids from other gaseous impurities.
• Hydrogen and other lighter hydrocarbons (gaseous form) are obtained as top product and aromatic.liquids are obtained as bottom product.
(h) Distillation tower:
• Light oil and heavy oils are separated by distillation tower as top and bottom product respectively.
• The process occurs at high pressure. So at first, pressure is reduced before distillation by ....pressure reducing valve.
• Reduction in pressure increases relative volatility of heavy oils and light oils.
• Lower temperature and less residence time reduces thermal degradation of aromatic oils.