Question

how we can put distilation column under total reflex if feed to disillation column cut off how we can calculate heat duty duity in distillation column if want cut the feed from distillation column and put distillation column under total reflex

Answer 1

We can put distillation column under total reflux by cutting off feed input & distillate output from column .

Total reflux is with zero flow out of system .Only heat is added from reboiler & remove by condenser but there is no separation .

it is done to get best separation column is run at total reflux for sometime then at zero reflux remove product like this operation proceeds.

we can find heat duty in similar manner we do for distillation column normally

but as here no feed & outputs

at equilibrium

such total reflux condition can br interprete as it requires infinite heat reboiler duty & infinite cooling capacity of condenser.

Load of condenser & reboiler is maximum in total reflux condition & no . of plates for sepraration are minimum .

Q_R & Q_C

as condenser condenses complete distillate

Q_C=

latent heat of distillate * amount of distillate