IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Methanol with Octane (n-octane) and Water
Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Methanol (methyl alcohol); CH4O; [67-56-1]  NIST Chemistry WebBook for detail
   (3) Octane (n-octane); C8H18; [111-65-9]  NIST Chemistry WebBook for detail
Evaluator:
   A. Skrzecz, Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland (1996.04)

 Critical Evaluation:
      A survey of reported compositions along the saturation curve and compositions of coexisting phases in equilibrium (eq.) for the system methanol-octane-water is given in Table 16.

Saturation curve
   The ternary system methanol-octane-water forms a large miscibility gap of type 2 covering the majority of the concentration triangle. Compositions along the saturation curves were not reported independently in the references; the saturation curves can be constructed on the bases of equilibrium compositions. Two binary systems, octane-water and octane-methanol, form miscibility gaps. The data for these systems were compiled and critically evaluated in previously published SDS volumes, Refs. 3 and 4 respectively. The recommended, Ref. 3, values of mutual solubility of octane-water system at 293 K4 are: x"2 = 9.9·10–8 and x'2 = 0.9995. The mutual solubility of methanol-octane system at 293 K4 are: x"1 = 0.944 and x'1 = 0.105. The binary data reported by Budantseva et al.2 are: x"2 = 2.0·10–7, x'2=0.999 57 and x"1 = 0.960, x'1 = 0.155, respectively.

Phases in equilibrium
   Compositions of coexisting phases in equilibrium for the ternary system methanol-octane-water were reported in both references. The experimental procedure was reported only in Ref. 1. After separation, methanol was determined by reaction with phthalic anhydride; water - with the Karl Fischer reagent. The compositions of phases in equilibrium reported in Refs. 1 and 2 are consistent with one another, they are treated as tentative and those at 293.2 K are presented in Fig. 9 .

 Experimental Data:   (Notes on the Nomenclature)
TABLE 16. Summary of experimental data for the system methanol-octane-water
AuthorT/KDataTypeReference
Kogan et al., 1956283, 293eq. (12)1
Budantseva et al, 1976293eq. (10)2
 View Figure 1 for this Evaluation

Notes:
Table 16  Number of experimental points in parentheses.

 References: (Click a link to see its experimental data associated with the reference)
   1  Kogan, V.B.; Deizenrot, I.V.; Kulbyaeva, T.A.; Fridman, V.M., Zh. Prikl. Khim (Leningrad) 29, 1387 (1956).
   2  Budantseva, L.S.; Lesteva, T.M.; Nemstov, M.S., Zh. Fiz. Khim. 1976, 50, 1344. Deposited doc. 1976, VINITI 437-76.
   3  Shaw, D.G., ed., Solubility Data Series, Vol. 37, Hydrocarbons with Water and Seawater, Part I: Hydrocarbons C8 to C36 (Pergamon, New York, 1989).
   4  Shaw, D.G.; Skrzecz, A.; Lorimer, J.W.; Maczynski, A., eds., Solubility Data Series, Vol 56, Alcohols with Hydrocarbons (Pergamon, New York, 1994).