10.1-3 a. Calculate the dew point pressure and liquid composition at T = 69°C for the mixture of Illustration 10.1-2. b.
Posted: Sat May 21, 2022 3:54 pm
- 10 1 3 A Calculate The Dew Point Pressure And Liquid Composition At T 69 C For The Mixture Of Illustration 10 1 2 B 1 (23.57 KiB) Viewed 15 times
- 10 1 3 A Calculate The Dew Point Pressure And Liquid Composition At T 69 C For The Mixture Of Illustration 10 1 2 B 2 (53.31 KiB) Viewed 15 times
10: Vapor-Liquid Equilibrium in Mixtures total pressure and value of corresponding to cachy. For the hexane-triethylamine system, to calculate the composition of the vapor in equilibrium with a 50 mol fans PEL M Ρ-Σπιρου = α Ερυ + αγPγαν -0.6 0.7583 +0.5 x 0.3843 = 0.6713 bar and then Eq. 10,1-3 is used to calculate the vapor-phase mole fraction of hexane 0.5 x 0.7583 -0.6637 P 0.5713 By choosing other liquid compositions and repeating the calculation at a fised to perature, the complete constant temperature vapor-liquid equilibrium composition agram, or -y diagram, can be constructed. The results are shown in Fig.10.12 line line, the greater the difference in composition between the liquid and vapor phases, and By: the greater the difference between the 2-y curve of the mixture and they the casier it is to separate the two components by distillation, as will be discussed lune in this section. (Since ty diagrams are most often used in the study of distillation, is common practice to include the = y or 45' line.) An alternative way of presenting vapor-liquid equilibrium data is to plot, on a single figure, the equilibrium pressure and the compositions for both phases at fixed temper ature. This has been done for the hexano-triethylamine system in Fig. 10.1-3. In this figure the equilibrium compositions of the vapor and liquid as a function of pressure are given by the curves labeled "vapor" and "liquid." respectively, the compositions of the two coexisting phases at each pressure are given by the intersection of a horizontal line (i.c., a line of constant pressure) with the vapor and liquid curves. The term tie line is used here and generally in this chapter, to indicate a line connecting the equilibrium compositions in two coexisting phases. The tie line drawn in Fig. 10.1-3 shows that at 10 08 Т- рrc 06 Yhexane mole fraction in vapor phase 04 02 0.4 1.0 02 06 0.8 hexane mole fraction in liquid phase Figure 10.1-2 The s-y diagram for the hexane-triethylamine system at T = 60 C. [Based on data of J.L. Humphrey and M. Van Winkle. J. Chen Eng. Data 12,526 (1967).)