Batch distillation Raleigh equation

For a batch differential distillation where no reflux is used, there is only boilup of a mixture of the desired lighter component, which leaves the kettle, and a desired residual bottoms composition is left in the kettle. This type of distillation follows the Raleigh equation to express the material balance. However, while simple, not having tower packing or trays or reflux does not offer many industrial applications due to the low purities and low yields involved. Repeated charges of the distillate back to the kettle and redistilling w411 improve overhead purity. 

A process that is closely related to sinple batch distillation is differential condensation fTreybal. 19801. In this process vapor is slowly condensed and the condensate liquid is rapidly withdrawn. A derivation similar to the derivation of the Raleigh equation for a binary system gives. 

Cl. For a binary, multistage batch distillation with constant prove that the mass balances over the entire batch period and the Raleigh equation give identical results. 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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