Chapter103_A - 10.35 a) The equation from NIST is: Mi = ki...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
b)For water as solvent: M s 18.015 gm mol := For CO2 in H2O: k i 0.034 mol kg bar := By Eq. (5): H i 1 M s k i := H i 1633bar = Ans. The value is Table 10.1 is 1670 bar. The values agree within about 2%. 10.36 Acetone: Psat 1 T () e 14.3145 2756.22 T degC 228.060 + kPa := Acetonitrile Psat 2 T 14.8950 3413.10 T degC 250.523 + kPa := a) Find BUBL P and DEW P values T 50degC := x 1 0.5 := y 1 0.5 := 10.35 a) The equation from NIST is: M i k i y i P = Eq. (1) x i H i y i P = Eq. (2) Solving to eliminate P gives: H i M i k i x i = Eq. (3) By definition: M i n i n s M s = where M is the molar mass and the subscript s refers to the solvent. Dividing by the toal number of moles gives: M i x i x s M s = Eq. (4) Combining Eqs. (3) and (4) gives: H i 1 x s M s k i = If x i is small, then x s is approximately equal to 1 and: H i 1 M s k i = Eq. (5) 333
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
x 1 Psat 1 T () y 1 P = 1x 1 Psat 2 T 1y 1 P = x 1 DEWT Find x 1 T , := DEWT 51.238degC = Ans. At P = 0.5 atm, two phases will form between T = 46.3 C and 51.2 C 10.37 Calculate x and y at T = 90 C and P = 75 kPa Benzene: Psat 1 T () e 13.7819 2726.81 T degC 217.572 + kPa := Toluene: Psat 2 T 13.9320 3056.96 T degC 217.625 + kPa := a) Calculate the equilibrium composition of the liquid and vapor at the flash T and P T 90degC := P 75kPa := Guess: x 1 0.5 := y 1 0.5 := BUBLP x 1 Psat 1 T 1 Psat 2 T + := BUBLP 0.573atm = Ans. DEWP 1 y 1 Psat 1 T 1 Psat 2 T + := DEWP 0.478atm = Ans. At T = 50 C two phases will form between P = 0.478 atm and 0.573 atm b)Find BUBL T and DEW T values P 0.5atm := x 1 0.5 := y 1 0.5 := Guess: T 50degC := Given x 1 Psat 1 T 1 Psat 2 T + P = BUBLT Find T := BUBLT 46.316degC
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

Chapter103_A - 10.35 a) The equation from NIST is: Mi = ki...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online