【正文】
reboiler。 ? condenser。 ? downer。Distillation : Summary ? Distillation is a widely used separation process. ? The separation is based on the volatility difference of the ponents to be separated. Wide application of distillation: WHY? ? Volatility difference exists for most ponents. ? Only heat is needed for the separation, no other extra agents are needed. So the products may be pure. Classification of distillation Relative Volatility Process Example big Equilibrium distillation or flash distillation H2 and oil medium fractionation Benzene and tolune minor Azeotropic distillation and extractive distillation Absolute ethanol production Flash distillation T xAor yA dew point line bubble point line Fractionation with rectifying section and stripping section ? column with rectifying section and stripping section ? condenser(total and partial), accumulator, cooler: cold water ? reflux and overhead product ?