(f)   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.