CHEE 311 Lecture 3: Lecture 3.pdf
22 Nov 2012
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Document Summary
To illustrate how p,t-flash calculations can be performed either graphically or numerically. If a stream consists of three components with widely differing volatilities, substantial separation of one component can be achieved using a simple flash unit. For some binary systems, you can often find a phase diagram in the range of conditions needed. For example, a pxy diagram for the furan(1)/ccl4(2) system at 30(cid:113)c is illustrated to the right. Determine x1, x2, y1, y2 and the fraction of the system that exists as a vapour (v) What is the lever rule and how does. Consider the ethanol(1)/toluene(2) system at p = 1atm. Determine x1, x2, y1, y2 and the fraction of the system that exists as a liquid (l) We specify t and p when we do flash calculations. For any closed system, formed initially from given masses of prescribed chemical species, the equilibrium state is completely determined when any two independent variables are fixed.
