IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Ethane with Poly(n-butyl methacrylate) (PBMA)
Components:
   (1) Poly(n-butyl methacrylate) (PBMA); ; [9003-63-8]  NIST Chemistry WebBook for detail
   (2) Ethane; C2H6; [74-84-0]  NIST Chemistry WebBook for detail
Original Measurements:
   S.A. Stern, U.M. Vakil and G.R. Mauze, J. Polym. Sci., Part B: Polym. Phys. 27, 405-423 (1989).

 Variables:
   Temperature = 259.4 K - 315.4 K
   Pressure = 0-67 kPa

 Prepared By:
   A.K. Bokarev

 Experimental Remarks:
   Sorption isotherms of ethane are linear in the range 259-315 K. Solubility coefficients can be described by Van't Hoff equation

   S = 5.25 × 10-5) - exp(-ΔHs/RT)cm3(STP)/cm3 cm Hg,

where ΔHs = -14.9 kJ/mol.
Sorption isotherms of butane are linear in the range 283-313 K: at lower temperatures they are convex to the pressure axis. The isotherms were represented by exponential relation

   C = S(0)p - exp(σ · c),

where S(0) is the Henry's law solubility coefficient and σ is a constant which depends on temperature. The parameters of this equation are given below:

S(0) can be described by the Van't Hoff equation

   S(0) = 5.24 × 10-4 exp(-ΔHg/RT)cm-3(STP)/cm-3 (cm Hg)-1, where ΔH1=-20.6 kJ/mol.

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

T/KSolubility [cm3(STP)/cm3/cm Hg]Remark(s)
2730.4320.0128 (sigma)
2830.3360.0051 (sigma)
2930.2520 (sigma)
3030.1760 (sigma)
3130.1790 (sigma)
 Method/Apparatus/Procedure:
   The solubility was measured by a gravimetric method. The apparatus included a Cahn microbalance, Model 2000 RG.

 Source and Purity of Materials:
   PBMA (Scientific Polymer Products of Ontario, NY) had a density of 1.06 g/cm3 at 299K and glass transition temperature (DSC) in the temperature range from 295 to 308 K.
The minimum purity of ethane and n-butane (Linde Division of Union Carbide Corp.) were 99.0 %.

 Estimated Errors: