Heating under reflux..?

Question

why do you heat organic liquids under reflux for such a long time? why not just for a few minutes instead of 1/2 hour or even 45 mins?

Answer 1

If you need to heat something under reflux for some time, it is because the reaction is very slow. So heating it up speeds up the reaction, but also creates the possibility of losing one or more of the volatile components. A reflux condenser therefore stops the loss of volatile components.

Answer 2

Heating Under Reflux

Answer 3

1

Answer 4

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RE:
Heating under reflux..?
why do you heat organic liquids under reflux for such a long time? why not just for a few minutes instead of 1/2 hour or even 45 mins?

Answer 5

This is NOT a reaction, it is a Physical Change...Distillation.

The reflux column is used to maintain a steady outlet temperature of the required product vapours going to the condenser.
Its purpose is to return heavier components of the vapour to the boiling liquid to minimise the inclusion of the heavier substances in the overhead product.
Throughout the reflux column, the exchange of Latent Heats is taking place to re-condense heavier fractions from the rising vapours and vaporise lighter fractions from the falling reflux.
The reflux provides better separation of the mixture.

Answer 6

If you saponify ethyl acetate with NaOH it goes like a shot. Ethyl pivalate will require hours for steric hindrance discouraging kinetics. Ethyl 2,6-diisopropylbenzoate will require the better part of forever for steric hindrance plus enforced horrible geometry.

If your oxidative metbolism were not kinetically slow, what would happen when you ate a cheeseburger? Mass/mass it has the same enthalpy of combustion as TNT.

Answer 7

In industry, they just increase pressure and temperature and everything desireable goes faster.