CHEN 3006 Lecture Notes - Lecture 48: Moodle, Mass Balance, Dont
4 May 2015
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When feed is too high or too low, extend operating lines since above feed line has to be rectifying and below has to be stripping. Feed doesn"t just actually change concentrationjust a graphical representation for which tray we"re putting the feed in. Superheated --> vapor is above bpas it enters, it will vaporize a small amt of l stream. Extracting 2 rare earths with 4 stage cascade. Aqueous feed w/ equal concentration of a and b. G/l = 1 efficiency @ each stage = 0. 8 (this isn"t overall efficiency, it"s for each stage) B: y = y* = 0. 5x: what is fraction recovered of each? ma = 1. 5 mb = 0. 5. G/l = 1 for this problem we can calculate a for each component this is b/c of different solubilities in the 2 phases. Chen3006_masstransferandseparations page 2 so the exiting g is 82% a and 18% b but in reality, we think of purity as exiting liquid stage.
