Table VIII. Effect of Carrier Gas Flow Rate on Activity Coefficients of C7Fla and of CBF160 in FC 10 1
Nitrogen Flow Rate. Cc./Min. at 1 Atm. and 30” C.
Activity Coefficient, y Peak BO Peak A a J 13 5.74 3.34 24 6.71 3.86 72 5.03 2.96 a Peak B = C7Hle; peak A = C8F160. * Vapor pressure of C8F16O a t 80’ C. = 535 mm. of mercury. coefficients of C7F16 and of C8FI60may be determined (Table 1‘111). The activity coefficients both shoiv a maximum a t a nitrogen flow rate of 24 cc. per minute, where the retention volumes are minimum. ACKNOWLEDGMENT
The assistance of John F. Walter in the experimental work is gratefully acknowledged. The author also thanks J. H. Simons for the perfluoropentane standard. NOMENCLATURE
E K
efficiency = partition coefficient, moles of =
solute per cc. of mobile gas phase divided by moles of solute per cc. of stationary solvent phase ’ Pi = inlet pressure = outlet pressure P O PO = vapor pressure = number of theoretical plates T = temperature, O K. t = temperature, O C. = time on chromatogram for 1/2.72 t, of maximum peak height = time on chromatogram for maxit, mum peak height VC = void volume in column v d = dead volume between sample injection and detector v1 = molar volume of solvent V , = molar volume of gas phase VR = observed retention volume at column temperature = corrected retention volume = volume of stationary solvent in column = mole fraction of solute in stationX ary solvent Y = mole fraction of solute in mobile gas phase AH = partial molal heat of mixing of solute in stationary solvent = activity coefficient of solute in Y stationary solvent n = total pressure in gas phase
s
LITERATURE CITED
Benning, A. F., Park, J. D., U. S. Patent 2,490,764 (1949).
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(4) Ibid., 78,876 (1956). (5) Dresdner, R. D., Department of Chemical Engineering, University of Florida, private communication. (6) Evans, D. G. hl., Tatlow, J. C., J . Chern. SOC.(London) 1955,3021. (7) Glen-, D. N., Reeves, L. W., J . Phys. C h e m 60,615 (1956). (8) Hildebrand, J. H , Scott, R. L., “Solubility of Sonelectrolytee,” 3rd ed., Reinhold, New York, 1950. (9) Leais, J. S., Patton, H. IT., Kaye, IT. I., ASAL. CHEM. 28, 1370 (1956). (10) Musgrave, W. K. R., Smith, F., J . Chena. Soc. (London) 1949.3021. (11) Oliver, G. D., Blumkin, S., Cunningham, C. IT’., J . Am. C h e w Soc. 73, 5 i 2 2 (1951). (12) Olivrr, G. D., Grisard, J.
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W.,Ihid.,
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