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The slope of the OL at which the OL touches the VLE-line represents the limiting liq-gas ratio. Since G is fixed, Ls becomes Ls min when OL touches the VLE-line. Vb W (fJ « I a. J 0 (fJ u. J 0 ~ MOLE RATIO OF SOLUTE IN LIQUID PHASE Fig. 1. Minimum Liq-Gas Ratio in Absorption. 2]. The liq-gas ratio for such systems is the slope of the operating line (AC) passing thru the point C that corresponds to an exit-liq concentration in equilibrium with the entering gas. The rate of flow of absorbent is : ...

Absorption dealing with dilute gas mixtures and liquids may approach isothermal condition; however, in large majority of cases as practically encountered in commercial processes, absorption operations are usually exothermic. Heat generation in absorption towers is counter-productive: 1----------------• The equilibrium solubility of the solute will go down. • The capacity of the absorber falls and will require larger liq flowrates to compensate and that may invite flooding. • In case the heat evolution is excessive, cooling coils may be installed in the absorber or the liq is to be removed at intervals, cooled and returned to the absorber.

Etc. in Eqn. ·yo 2 (1+ e a ) - Or, (1 + e a)2. [ e -1 ] a cf. a + ar + ar2 +....... P. Also, 1 + e a + e; + e! P. Y4 +e! 2) yields: Ls·xn - Ls·xo Gs·yn+1 - Gs·y 1 = or, ~. Gs (xn-xo) =Yn+1- Y l Fig. (e a -1)·y o e - Yn e n + 1 _1 a a Now, ea Yn+l - Y1 en+l_ a Yn+l - Y0 = e an+l - 1 where, Yn+1 - Yl Yn+1 - Yo ... 64) = actual change in gas composition. , ifthe gas leaving the absorber is in equilibrium with entering liquid. Putting n =NT' the total number of trays, the Eqn. 64 yields: YN T +1- Y0 Solving for NT we get: ...

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