xB (mole fraction B) Figure 1.22 Residue curves starting from different initial conditions.

components A and B. The rate of vapor withdrawal is V (moles per unit time):

dMi liq dt d(Mliqxj) dt

Of course, the values of xj and yj are related by the VLE of the system. Expanding the second equation and substituting the first equation give

Ml dxj

Mliq dxj

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