IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Ethylene and Poly(methyl methacrylate) (PMMA)

Components:
   (1) Poly(methyl methacrylate) (PMMA); ; [9011-14-7]  NIST Chemistry WebBook for detail
   (2) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (3) Ethylene; C2H4; [74-85-1]  NIST Chemistry WebBook for detail

Original Measurements:
   E.S. Sanders, W.J. Koros, H.B. Hopfenberg and V. Stannett, J. Membr. Sci. 13, 161 (1983).

Variables:
   Temperature = 308 K
   Pressure = 308 K

Prepared By:
   A.K. Bokarev

Experimental Remarks:

   The following figure concerns mixed gas sorption of CO₂ and C₂H₄. Points are experimental data, solid lines are predictions of DMS equation and dashed lines are prediction of DMS equation for mixed penetrants:

C₁=k_D1p₁++C¹_H1b₁p₁/(1+b₁p₁+b₂p₂)

C₂=k_D2p₂++C¹_H2b₂p₂/(1+b₁p₁+b₂p₂).

All the parameters for gases (1) and (2) are pure components sorption parameters from Table 2.

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

Table 1. Sorption isotherms of pure C₂H₄ and pure CO₂ in PMMA at 308 K. (The original data wre represented graphically)
Chemical Name	Pressure [MPa]	Sorption [(V₁(STP)/V₃)]
C2H4	0.09	2.03
C2H4	0.16	2.92
C2H4	0.19	3.36
C2H4	0.22	3.81
C2H4	0.27	4.29
C2H4	0.32	4.90
C2H4	0.34	5.13
C2H4	0.39	5.62
C2H4	0.43	5.99
C2H4	0.47	6.46
C2H4	0.53	6.92
C2H4	0.56	7.04
C2H4	0.64	7.83
C2H4	0.73	8.29
C2H4	0.75	8.85
C2H4	0.80	9.06
CO2	0.06	2.37
CO2	0.11	3.58
CO2	0.12	4.03
CO2	0.15	4.64
CO2	0.20	5.85
CO2	0.21	5.97
CO2	0.24	6.79
CO2	0.27	7.39
CO2	0.30	8.05
CO2	0.34	8.80
CO2	0.39	9.66
CO2	0.42	9.92
CO2	0.45	10.45
CO2	0.45	10.64
CO2	0.48	10.92
CO2	0.50	11.34
CO2	0.53	11.90
CO2	0.55	12.13
CO2	0.56	12.30
CO2	0.59	12.46
CO2	0.63	13.25
CO2	0.65	13.56
CO2	0.67	13.72
CO2	0.70	14.05
CO2	0.70	14.19

Table 2. Dual mode sorption parameters for pure component sorption of CO₂ and C₂H₄ in PMMA at 308 K
Chemical Name	Henry's law constant, K [cm³ (STP) cm^-3 atm^-1]	Concentration C₁ [cm³(STP) cm^-3]	Affinity Coefficient b [atm^-1]
CO2	0.916	12.59	0.236
C2H4	0.531	7.09	0.259

View Figure 1 for this Evaluation

Method/Apparatus/Procedure:
   A novel apparatus to measure precisely both pure and mixed gas sorption in glassy polymers is described. A method for accurate calibration and operation of the equipment is discussed, based upon complete closure of the material balance of all gaseous components in all phases. The overall scheme of the sorption apparatus is illustrated and the details of the sorption cell are presented.

Source and Purity of Materials:
   CO₂: Air Products, purity 99.99 % (Coleman grade).
C₂H₄: Airco Research Triangle Park, purity 99.5 % (2.5 grade).
PMMA: Aldrich Chemical Co., M_w = 600 000.

Estimated Errors:

   Temperature: No information given