IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: n-Butane with 2-Methylpropane, 2,2-Dimethylpropane and Ethyl Cellulose (EC)
Components:
   (1) Ethyl Cellulose (EC); ; [9004-57-3]  NIST Chemistry WebBook for detail
   (2) n-Butane with 2-Methylpropane, 2,2-Dimethylpropane; CH10, C4H10, C5H12; [106-97-8, 75-28-5, 463-82-1]  NIST Chemistry WebBook for detail
Original Measurements:
   R.M. Barrer, J.A. Barrie and J. Slater, J. Polym. Sci. 27, N 115, 177 (1958). A.H. Chan, W.J. Koros and D.R. Paul, J. Membr. Sci. 3, 117 (1978).

 Variables:
   Temperature = 303.7 K - 353 K
   Pressure = 0-24 kPa

 Prepared By:
   Yu. P. Yampol'skii

 Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)
   
Table 1. Enthalpies of sorption of hydrocarbon gases in ethyl cellulose
Chemical NameEnthalpy [kJ/mol]Enthalpy NoteRemark(s)
n-Butane-18.12H-4.33 kcal/mol
2-Methylpropane-8.41H-2.01 kcal/mol
2,2-Dimethylpropane-38.07H-9.10 kcal/mol
Table 2. Sorption isotherms of various gases in ethyl cellulose measured by Barrer et al. (The original data were represented graphically)
T/KChemical NamePressure [cm Hg]Sorption [mol1 cm2-3]
303.7n-C4H101.785.86
303.7n-C4H103.579.75
303.7n-C4H105.6913.27
303.7n-C4H108.8217.26
303.7n-C4H1011.7120.58
303.7n-C4H1014.5323.22
313.5n-C4H102.565.34
313.5n-C4H105.188.81
313.5n-C4H107.8111.87
313.5n-C4H1011.6115.34
313.5n-C4H1015.1417.88
323.3n-C4H103.604.82
323.3n-C4H106.707.78
323.3n-C4H109.9910.47
323.3n-C4H1011.5111.30
323.3n-C4H1014.5013.17
333n-C4H102.932.85
333n-C4H104.614.20
333n-C4H108.386.58
333n-C4H1012.158.81
333n-C4H1014.039.69
343n-C4H103.572.33
343n-C4H105.623.42
343n-C4H109.995.49
343n-C4H1011.576.12
343n-C4H1014.437.36
303.7iso-C4H101.934.38
303.7iso-C4H105.208.79
303.7iso-C4H107.0610.87
303.7iso-C4H1010.8613.70
303.7iso-C4H1014.8016.35
313.5iso-C4H102.773.83
313.5iso-C4H104.595.81
313.5iso-C4H106.857.65
313.5iso-C4H1011.5910.82
313.5iso-C4H1014.5212.42
323.3iso-C4H103.543.38
323.3iso-C4H105.794.98
323.3iso-C4H108.396.61
323.3iso-C4H1011.158.04
323.3iso-C4H1014.049.30
323.3iso-C4H1016.1610.01
333iso-C4H102.021.40
333iso-C4H104.282.83
333iso-C4H107.004.19
333iso-C4H1010.065.61
333iso-C4H1013.166.8
333iso-C4H1015.647.44
343iso-C4H102.391.12
343iso-C4H105.112.34
343iso-C4H108.243.53
343iso-C4H1011.674.62
343iso-C4H1014.935.66
323.3neo-C5H122.804.00
323.3neo-C5H124.915.70
323.3neo-C5H127.237.61
323.3neo-C5H1211.239.65
323.3neo-C5H1213.6211.19
323.3neo-C5H1215.4012.52
338.6neo-C5H122.121.77
338.6neo-C5H124.103.20
338.6neo-C5H126.654.63
338.6neo-C5H129.685.99
338.6neo-C5H1214.347.52
348neo-C5H124.872.69
348neo-C5H127.863.81
348neo-C5H1211.155.13
348neo-C5H1216.156.38
353neo-C5H122.651.33
353neo-C5H125.272.41
353neo-C5H128.493.39
353neo-C5H1211.954.61
353neo-C5H1215.675.52
Table 3. Dual mode sorption parameters for gases in EC calculated by Chan et al. by treatment of sorption isotherms (The original data were represented graphically)
T/KChemical NameHenry's law constant, K [cm3(STP)/cm3 atm]Langmuir's parameter, CH [cm3(STP) cm-3]Affinity Coefficient b [atm-1]
303n-C4H100.16563.710.2173
313n-C4H100.11613.730.1232
323n-C4H100.10202.300.1297
333n-C4H100.10071.280.1395
343n-C4H100.06101.300.1005
303iso-C4H100.09093.340.1810
313iso-C4H100.06142.940.0087
323iso-C4H100.09780.750.4587
333iso-C4H100.05522.030.0688
343iso-C4H100.06980.510.1362
323neo-C5H120.10231.680.2074
338neo-C5H120.06991.450.1149
348neo-C5H120.03902.370.0638
353neo-C5H120.03461.260.0894
 Method/Apparatus/Procedure:
   A glass volumetric apparatus was employed. The sorption system was immersed in a thermostat and the pressure was read by a cathetometer. A nonlinear least squares program was used to calculate sorption parameters as in Ref. I.

 Source and Purity of Materials:
   EC: Standard Ethocel, density 1.13 g/cm3, M,, = 35 000.

 Estimated Errors:
   Solubility: Relative precision: p ± 6.6%.
   Temperature: Precision in T: ±0.05 K.

 References:
   1W I. Korot, D. R. Paul, and A. A. Rocha, J. Polym. Sci., Polym. Phys. Ed. 14, 687 (1976).