496
INDUSTRIAL AND ENGINEERING CHEMISTRY Weight Fraction Acetone in
CL H 3 CII
Vol. 40, No: 3
Phose
Weight *IsWoter i n Woter Phose
Figure 6.
Weight Fraction Glycol in Water Phase
Figure 4.
Log Plot of Solute Distribution
Correlation of Tie-Line Data
glycol and 1%-ater,respectively, in the water phase and d x : , are the weight fractions of glycol and alcohol in the alcohol phase. Figure 5 shows the data of Table I and I1 plotted in this manner. Straight-line correlations are obtained over the range of concentrations investigated. Bachman (1) suggested that tie-line data could be correlated on a rectangular coordinate plot of weight per cent nonconsolute A in the A-rich phase versua the ratio of the weight per cent nonconsolute -4in the A-rich phase and the weight per cent nonconsolute B in the B-rich phase. This has been done in Figure 6 with good results where the weight per cent of r a t e r in the v-ater phase is plotted versus the ratio of the weight per cent of water in the m,ter phase and the weight per cent of alcohol in the alcohol phase. The advantage of the correlations illustrated in Figures 5 and 6 is, of course, that complete tie-line information can be obtained from the minimum experiniental data required to determine the straight line. NOMENCLATURE
n-eight fract,ion of ZTJI = xeight. fract,ion of = weight fraction of N . ~ = !;-eight, fraction of ZG
=
ZC
glycol in tBheivater phase water in the wat,er phase glycol in the alcohol phase alcohol in the alcohol phase
LITERATURE CITED
Figure 5. Correlation of Tie-Line Data
TABLE11. SYSTEM ETHYLENE GLYCOL-WHEXYL ALCOHOLWATERAT 20 ’ C. Solubility D a t a , Weight Per Cent n-Hexyl n-Hexyl alcohol Kate1 Glycol alcohol Water 99.6 0.5 5.7 0.0 94.3 89.5 10.0 0.5 6.5 74.8 79.6 1 9 . 9 0 . 5 7.4 64.8 69.5 29.9 0.6 7.7 61.5 59.6 3 9 . 7 0 . 7 8.4 55.0 49.6 49.6 0.8 10.0 45.0 39.6 1 . 0 5 9 . 4 1 1 . 4 35.4 29.4 68.5 14.0 2.1 26.0 19.2 7 6 . 5 1 6 , 2 4 . 3 17.0 ... ... 17 .O ... 8.3 Tie-Line D a t a ’ Water-Phase Composition, Weight% Alcohol-Phase Composition, Weight % n-Hexyl n-Hexyl Glycol Water alcohol Glycol Water alcohol 78.4 0.5 21.1 5.8 91.7 2.5 69.9 0.6 29.5 5.8 91.2 3.0 59.3 0.7 6.9 90,5 40.0 3.6 Glycol 0.0 18.7 27.8 30.8 36.6 45.0 53.1 60.0 67.8 74.7
(1) Bachman, Irvin, IXD. ENG.CHEM.,ANAL.ED.,12, 38 (1940). (2) Campbell, J. A , , IND.ESG.CHEM.,36, 1158 (1944). (3) Coleman, J. M.,and Swenson, 0. J., Ibid., 38, 834 (1946). (4) Durrans, T. H., “Solvents,” London. Chapman and Hall, 1944. (5) Hand, D. B., J . Phys. Chem., 34, 1961 (1930). (6) “Handbook bf Chemistry and Physics,” 26th ed., Akron, Ohio, Chemical Rubber Publishing Co.. 1942. (7) Treybal, R. E., Weber, L. D., and Daley, J. F., ISD.EXG.CHCU., 38,817 (1946). RECEIVED April 2 , 1947. Presented before the Dn-ision of Industiial and Engineering Chemistiy a t the 111th Meeting of t h e A V E R I C A N CHIXICAL SOCIETY, Atlantic City, S. J.
Vapor Pressure of Pure SubstancesCorrection I n the table of corrections on page 1684 of the December 1947 issue, the reference associated with cymene, CloHla,should have been Gibbons and eo-workers, J . Am. Chem. Soc., 68, 1130-1 (1946). DASIELR. STULL Dom CHEXICAL Co MIDLASD,MICH.
