Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 8 : 1
< 6:1
> 4 :1
> 8:1

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Mass Transfer
Flash distillation is

Same as simple distillation
Same as differential distillation
Most useful for handling binary systems
Used for multicomponent systems like crude refining

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