IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Methane and Polyimide Kapton H

Components:
   (1) Carbon dioxide with Methane; CO2, CH4; [124-38-9, 74-82-8]  NIST Chemistry WebBook for detail
   (2) Polyimide Kapton H; ; [25036-53-7]  NIST Chemistry WebBook for detail

Original Measurements:
   R.T. Chern, W.J. Koros, B. Yui, H.B. Hopfenberger and V.T. Stannett, J. Polym. Sci., Polym. Phys. Ed. 22, 1061 (1984).

Variables:
   Temperature = 333 K
   Pressure = 0-2.0 MPa (0-20 atm)

Prepared By:
   Yu. P. Yampol'skii

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)

Dual mode sorption parameters for carbon dioxide and methane in Kapton H at 333 K
Chemical Name	Henry's law constant, K [cm³(STP)/cm³ atm]	Langmuir's parameter, C_H [cm³(STP) cm^-3]	Affinity Coefficient b [atm^-1]	Remark(s)
CO2	0.380 ± 0.054	12.280 ± 1.48	0.296 ± 0.023	Based on pressure
CH4	0.700 ± 0.011	2.684 ± 0.376	0.174 ± 0.032	Based on pressure
CO2	0.439 ± 0.058	11.817 ± 1.486	0.316 ± 0.069	Based on fugacity
CE4	0.073 ± 0.011	2.653 ± 0.384	0.175 ± 0.034	Based on fugacity

View Figure 1 for this Evaluation

View Figure 1 for this Evaluation

Method/Apparatus/Procedure:
   A pressure decay method of sorption measurement used was described in detail in Ref. 1. Each isotherm included several consecutive series of runs with stepwise pressure increase. The virgin films were degassed at 333 K for 120 h before measurement.

Source and Purity of Materials:
   CO₂ Coleman-grade 99.999 %. CH₄: instrument-grade 99.7 %. Kapton H: H. I. DuPont Co.; no glass transition temperature revealed in DSC measurement up to 777 K.

Estimated Errors:

   Temperature: No information given.

References:
   ¹W 2. Koros and D. R. Paul, J. Polym. Sci., Polym. Phys. Ed. 14, 1903 (1976).