Week_6_review

# Week_6_review - o T c mean = y A T c A y B T c B … o P c...

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EngrD 2190 Review of Week 6 Single Phase Systems: Finding densities of mixtures: 1) Weighted Average of pure component densitites: ρ solution = ρ A x A * ρ b x b 2) Assume volume additivity (good approximation when components do not interact) a. V before mixing = V after mixing ; ρ solution = Mass/V Ideal Gas Law (high volume, low pressure, no interaction between components): PV = nRT - Partial pressure of component = mole fraction * total pressure (i.e. P A = x A P) - Relative humidity = Correlations for gases at non-ideal conditions: - Compressibility factor (use charts) o Z = - Virial equation of state (for pressures < 20atm, nonpolar species) - Corresponding state (generalized correlations from chart) o Finding critical temperature and pressures o Calculating reduced temperature and pressure - Cubic equations of state (van der Waals, Redlich-Kwong, Peng-Robinson – don’t need to memorise, but know how to use) - Kay’s rule for mixtures o Using a mean compressibility factor

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Unformatted text preview: o T c, mean = y A T c, A + y B T c, B + … o P c, mean = y A P c, A + y B P c, B + … o Phase Equilibrium Clapeyron Equation: Clausius – Clapeyron Equation: Antoine Equation: Extensive variables: volume dependent Intensive variables: volume independent Gibbs Phase Rule: DOF = 2 + (# chemical species) – (# phases)- (# reactions) vap vap V T H dT dP ˆ ˆ * ∆ ∆ = -∆-= o vap o T T R H P P 1 1 ˆ * ln * ln C T B A P +-= * log 10 Raoult’s Law : y A P = P A *(T) – valid where x A is close to 1 P A *(T) – vapor pressure of pure liquid A at temperature T Henry’s Law: P A = y A P = x A H A (T) – valid where x A is close to 0 H A (T) – Henry’s Law constant Bubble point temperature: Temperature at which first vapor bubble forms at given pressure Dew point temperature: Temperature at which first liquid droplet forms at given pressure...
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Week_6_review - o T c mean = y A T c A y B T c B … o P c...

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