Recovery of a solvent vapor from a gas stream by condensation can be achieved by cooling the gas, by compressing it, or by a combination of these operations. The greater the compression, the less cooling is needed. A gas mixture at a pressure Po and temperature To is the feed to a recovery process. A single condensable vapor and several noncondensable gases are present in the mixture, giving the feed a dew point of Tao. A fraction f of the vapor is to be condensed. For a gas feed rate of ho, draw and label a flowchart. Then derive the following relationship for the final condenser pressure in terms of the final temperature Tr and the specified feed conditions and fractional solvent recovery: P, =P(T:)[1 fp"(Ta)/Po] (1-p (T)/Po Also show that for a given final condenser pressure, the vapor pressure of the condensable component is given by P:(1-f)p (Tao) Po-fp"(T0) p'(T); =