IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: 2-Butanol with Benzene and Water

   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 2-Butanol (sec-butanol, sec-butyl alcohol, (RS)-2-butanol, dl-2-butanol, DL-2-butanol); C4H10O; [78-92-2]  NIST Chemistry WebBook for detail
   (3) Benzene; C6H6; [71-43-2]  NIST Chemistry WebBook for detail

   A. Skrzecz, Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland (1997.05)

Critical Evaluation:

      A survey of reported compositions along the saturation curve (sat), and compositions of coexisting phases in equilibrium (eq.) for the system 2-butanol-benzene-water is given in Table 78.

Saturation curve
   The ternary system 2-butanol-benzene-water forms a miscibility gap of type 2. Two binary systems, benzene-water and 2-butanol-water, form miscibility gaps. These systems were compiled and critically evaluated in previously published SDS volumes, Refs. 3 and 4, respectively. These recommended values of mutual solubility at 303 K are x'2=0.996 40, x"2=0.000 418 for the benzene-water system, and x'1=0.318, x"1=0.0491 for the 2-butanol-water system. Both types of data reported by Davis and Evans1 are consistent with one another at a binodal curve. The data of Letcher et al.2 were reported in graphical form only and therefore are not compiled. The maximum alcohol concentration on the binodal curve at 298 K, x1=0.50, Ref. 2, is consistent with the results of Davis and Evans at 303 K,1 x1=0.499. The experimental tie lines at 303.2 K1 are shown in Fig. 42 together with the experimental points along the saturation curve.

Experimental Data:   (Notes on the Nomenclature)

TABLE 78. Summary of experimental data for the system 2-butanol-benzene-water
Davis and Evans, 1960303sat. (17), eq. (10)1
Letcher et al., 1990298sat. (13), eq. (4)2
View Figure 1 for this Evaluation

Table 78  Number of experimental points in parentheses.

References: (Click a link to see its experimental data associated with the reference)

   1  Varteressian, K.A.; Fenske, M.R., Ind. Eng. Chem. 28, 928 (1936).
   2  Letcher, T.M.; Sewry, J.; Radloff, S., S. Afr. J. Chem. 43, 56 (1990).
   3  Shaw, D.G., ed., Solubility Data Series, Vol. 37, Hydrocarbons with Water and Seawater, Part I: Hydrocarbons C5 to C7 (Pergamon, New York, 1989).
   4  Barton, A.F. M., ed., Solubility Data Series, Vol. 15, Alcohols with Water (Pergamon, New York 1984).