Phase Condition of the Feed as a Criterion

When selecting a separation method from Table 7.1, the phase condition of the feed is considered first. 

If the feed is a vapor or is readily converted to a vapor, the following operations from Table 

1 should be considered (1) partial condensation (the opposite of a flash or partial vaporization), (2) distillation under cryogenic conditions, (3) gas absorption, (4) gas adsorption, (5) gas permeation with a membrane, and (6) desublimation. 

1 may be applicable (1) flash or partial vaporization, (2) (ordinary) distillation, (3) stripping, (4) extractive distillation, (5) azeotropic distillation, (6) liquid-liquid extraction, (7) crystallization, (8) liquid adsorption, (9) dialysis, reverse osmosis, ultrafiltration, and perva-poration with a membrane, and (10) supercritical extraction. A flash and the different types of distillation are also applicable for feeds consisting of combined liquid and vapor phases. 

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