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SOME PHYSICAL PROPERTIES OF THE SYSTEM 2-ETHOXYETHANOLBUTYL ACETATE
Vol 62
Positive pressure on the still was provided by dfy nitrogen. The boiling point was read to a precision of f 0 . 1 . Samples were analyzed by comparing their refractive indices with the refractive index-composition curve of the system.
BY K. J. MILLER
Results
Chemistry Department, Mount Union College, Alliance, Ohio Received January $1, 1068
Refractive index values, listed in Table I, when plotted as a function of mole yo show a curve bowed downward with maximum deviation from a linear relation at 50-50 mole Yo.
Particularly because of its excellent solvent properties 2-ethoxyethanol has been of interest to investigators. Little information has been available on binary mixtures of 2-ethoxyethanolorganic acetates. Consequently it seemed of interest t o begin a study of these systems. This paper deals with the densities, refractive indices and viscosities a t 25' and of the boiling pointcomposition diagram of the system 2-ethoxyethanol-butyl acetate. Experimental Materials.-2-Ethoxyethanol (Eastman Kodak No. 1697) was dried by refluxing over freshly ignited lime and carefully distilled using a Todd distillation column. Butyl acetate (Eastman Kodak No. 710) was dried with anhydrous MgSOc and carefully distilled using a Todd distillation column.
Fig. 1.-Boiling
point-composition diagram for the system 2-ethoxyethanol-butyl acetate.
TABLE I 2-ETHOXYETHANOL-BUTYL
ZEE, mole %
Density d%, g./ml.
0 8.26 12.49 14.54 21.82 39.51 46.91 50.20 51.74 56.04 64.88 75.47 76.74 77.94 90.79 95.31 96.78 100
0.8764 .8786 ,8800 .8808
.8832 ,8905 .8939 .8956 .8962 .8984 ,9029 .9092 .9100 .9107 .9187 .9217 .9227 .9250
c
ACETATE
Viscosity
Refractive index, n%
V / V H ~ O , 2.5'
0.7527 .7779 .7935 .SO37 .8411 .9558 1.0238 1.0564 1.0714 1.1186 1.2327 1.4082 1.4286 1.4509 1.7517 I.8761 1.9261 2.0316
I
1.3918 1.3925 1.3929 1.3931 1.3938 1.3958 I. 3967 1.3971 1.3973 1.3980 1.3992 1.4011 1,4013 1.4016 1.4039 1.4048 1.4050 1.4059
Viscosity of mixtures relative to water a t 25O, listed in Table I, when plotted as a function of mole % show a curve bowed downward, below both the l o g a r i t h r n i ~and ~ ~ ~lineara ideal type relations proposed for viscosity of solutions. The boiling point-composition diagram, shown in Fig. 1, shows an azeotrope boiling at 125.7' a t a composition of about 16 mole % 2-ethoxyethanol. The composition of this azeotrope was found t o differ appreciably from that previously reported.'
The center fractions in distillations were used for measurements. Apparatus and Procedure.-The measurement of density, refractive index and viscosity and the preparation of solutions have been described previously.' In this study temperature of the refractometer was controlled at 25 f 0.05" by circulating water through the refractometer cell with a small pump and a precision in refractive index of f.0.0001 was obtained. (4) J. Kendall and A. H. Wright, J. A m . Chsm. Soe., 4.2, 1776 Boiling point-composition determinations were carried out in an Othmer equilibrium still* manufactured by the (1920). (5) R. E. Powell, W. E. Roseveare and H. Eyring. Ind. Eno. CAem., Emil Greiner Co. The pressure was maintained a t 760 mm. by means of a manostat similar to that previously d e ~ c r i b e d . ~ 33, 430 (1941). (1) K. J. Miller, THIBJOURNAL, 61, 932 (1957). (2) D. F. Othmer, Anal. Chsm., SO, 763 (1948).
(3) E . L. Piret and M. W. Hall, Ind. Eno. Chsm., 40, 661 (1948).
c
( 6 ) E. C. Bingham, Am. Chem. J.. 36, 195 (1900). (7) An azeotrope contaiping 35.7 weight % 2-ethoxyethanol has been reported; Carbide and Carbon Chemicals Co., "Cellosolve and Carbitol Solvents," 1956.
