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Vapor-liquid equilibria for the nitrogen-isobutane system

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Abstract

Vapor-liquid equilibria have been investigated experimentally for the nitrogen-isobutane system at temperatures from 120 K to 220 K and at pressures up to 150 bar. Below 126.5 K, two liquid phases were observed as pressure was increased to near the vapor pressure of pure nitrogen. The equilibrium ratio of nitrogen in the binary system and the Henry’s law constants for nitrogen in isobutane were determined from experimental data. The experimental phase equilibrium data were correlated by means of the Peng-Robinson equation of state.

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Abbreviations

a, b, m, α :

Constants of the P-R equation of state

δx 1 :

x 1,cal -x 1,exp

δy 1 :

y 1,cal -y 1,exp

δP/P%:

100(P exp -P cal)/P exp

h 12 :

Henry’s constant for component 1

K i :

Equilibrium ratio; distribution of component i between liquid and vapor phase

k 12 :

Adjustable parameter

P c :

Critical pressure

P s :

Saturation vapor pressure

R :

Gas constant

T :

Kelvin temperature

T c :

Critical temperature

T r :

T/T c

V :

Molar volume

V oL1 :

Solute partial molar volume at infinite dilution

x :

Mole fraction in liquid phase

y :

Mole fraction in vapor phase

Z:

PV/RT

Ω:

Acentric factor

Φ:

Fugacity coefficient

ψ:

The Poynting correction

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Author information

Authors and Affiliations

  1. Department of Chemical and Environmental Engineering, University of Arizona, 85721, Tucson, Arizona

    Guangshun Chen

  2. Institute for Thermodynamics and Reaction Engineering, Technical University of Berlin, Strasse des 17 Juni 135, 10617, Berlin, Germany

    Helmut Knapp

  3. Department of Chemical Engineering, Zhejiang University, Hangzhou, China

    Yujun Hou

Authors
  1. Guangshun Chen
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  2. Helmut Knapp
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  3. Yujun Hou
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Chen, G., Knapp, H. & Hou, Y. Vapor-liquid equilibria for the nitrogen-isobutane system. J Solution Chem 26, 779–790 (1997). https://doi.org/10.1007/BF02767783

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  • DOI: https://doi.org/10.1007/BF02767783

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