IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Methane and Polystyrene (PS)

Components:
   (1) Polystyrene (PS); ; [9003-53-6]  NIST Chemistry WebBook for detail
   (2) Carbon dioxide with Methane; CO2, CH4; [124-38-9, 74-82-8]  NIST Chemistry WebBook for detail

Original Measurements:
   P.C. Raymond and D.R. Paul, J. Polym. Sci., Part B: Polym. Phys. 28, 2079-2102 (1990).

Variables:
   Temperature = 308 K
   Pressure = 0-2.5 MPa (0-25 atm)

Prepared By:
   Yu. P. Yampol'skii

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

Table 1. Sorption C/(cm³(STP)/cm³) of methane and carbon dioxide in PS*
Chemical Name	Pressure [atm]	Sorption
CH4	5	1.5
CH4	10	2.6
CH4	15	3.6
CH4	20	4.4
CH4	25	5.3
CO2	5	6.7
CO2	10	11.1
CO2	15	14.6
CO2	20	17.6
CO2	25	20.0

Table 2. Dual mode sorption parameters
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]
CH4	0.135	3.28	0.061
CO2	0.535	8.63	0.194

Notes:
   ^*  Smoothed data taken from the plot by the compiler.

Method/Apparatus/Procedure:
   Gas sorption measurement was performed using the same equipment and procedure as in ref.1. Sorption isotherms for methane were obtained using polymer samples which had never been exposed to CO₂. The CO₂ isotherm was obtained using the samples that had been conditioned in CO₂ at 25 atm for 24 h.

Source and Purity of Materials:
   PS (Cosden Oil 550) had a density 1.052 g/cc and the glass transition temperature 373 K. No information on gas purity given.

Estimated Errors:

References:
   ¹Maeda, Y.; Paul, D.R. Polymer, 1985, 26, 2055.