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Title: Vapor pressure isotope effects in the benzene (B) --cyclohexane (C) system from 5 to 80 /sup 0/C. I. The pure liquids B-d/sub 0/,B-d/sub 1/,ortho-,meta-, and para-B-d/sub 2/, B-d/sub 6/,C-d/sub 0/, and C-d/sub 12/. II. Excess free energies and isotope effects on excess free energies in the solutions B-h/sub 6//B-d/sub 6/, C-h/sub 12//C-d/sub 12/, B-h/sub 6//C-h/sub 12/, B-d/sub 6//C-h/sub 12/, and B-h/sub 6//C-d/sub 12/

Abstract

High precision measurements of the vapor pressure differences between some deuterated benzenes B-d/sub x/ (x=1, para-2, and 6) and protio benzene B-d/sub 0/; between para- and ortho-, and para- and meta-dideuterobenzene; and between perdeuterocyclohexane C-d/sub 12/ and protiocyclohexane C-d/sub 0/ were made from near the freezing point to the normal boiling point. The data are best represented as the logarithmic ratios ln R (d/sub 6/) =ln (P/sub d/0/P/sub d/6) =1226.5/T/sup 2/-12.178/T, ln R (para/ortho) =ln (P/sub parahyphend/2/P/sub orthohyphend/2) =2.6/T/sup 2/, and ln R (para/meta) =ln (P/sub parahyphend/2/P/sub metahyphend/2) =-2.0/T/sup 2/, together with the deviations from the law of the mean ..delta.. (d1) =6-(ln R (d/sub 6/)/lnR (d/sub 1/))=0.177-3.6 x 10/sup -4/t and ..delta.. (d/sub 2hyphenpara/=3-(ln R (d/sub 6/)/ln R (d/sub 2hyphenpara/))=0.028 +1.0 x 10/sup -4/t. The isotope effects are inverse and display significant deviations from the law of the mean. The cyclohexane results are given by ln R (C-d/sub 12/) =-2188.4/T/sup 2/-18.587/T. New measurements of the vapor pressures of benzene--cyclohexane solutions are also reported between 5 and 80 /sup 0/C. The data are in good agreement with the best earlier work. Excess free energies of the equimolar solutions B-h/sub 6//B-d/sub 6/ and C-h/sub 12//C-d/sub 12/ have been measured between 20more » and 80 /sup 0/C. Suitable fits to the data yield the following results (30 /sup 0/C); G/sup ex/(B-h/B-d), G/sup ex/(C-h/C-d); H/sup ex/(B-h/B-d),« less

Authors:
; ;
Publication Date:
Research Org.:
Chemistry Department, University of Tennessee, Knoxville, Tennessee 37916
OSTI Identifier:
5120323
Resource Type:
Journal Article
Journal Name:
J. Chem. Phys.; (United States)
Additional Journal Information:
Journal Volume: 68:7
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BENZENE; VAPOR PRESSURE; CYCLOHEXANE; DEUTERIUM; ISOTOPE EFFECTS; DEUTERIUM COMPOUNDS; SOLUTIONS; ALKANES; AROMATICS; CYCLOALKANES; DISPERSIONS; HYDROCARBONS; HYDROGEN COMPOUNDS; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; MIXTURES; NUCLEI; ODD-ODD NUCLEI; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; STABLE ISOTOPES; THERMODYNAMIC PROPERTIES; 400302* - Organic Chemistry- Isotope Effects- (-1987)

Citation Formats

Jakli, G., Tzias, P., and Van Hook, W.A.. Vapor pressure isotope effects in the benzene (B) --cyclohexane (C) system from 5 to 80 /sup 0/C. I. The pure liquids B-d/sub 0/,B-d/sub 1/,ortho-,meta-, and para-B-d/sub 2/, B-d/sub 6/,C-d/sub 0/, and C-d/sub 12/. II. Excess free energies and isotope effects on excess free energies in the solutions B-h/sub 6//B-d/sub 6/, C-h/sub 12//C-d/sub 12/, B-h/sub 6//C-h/sub 12/, B-d/sub 6//C-h/sub 12/, and B-h/sub 6//C-d/sub 12/. United States: N. p., 1978. Web.
Jakli, G., Tzias, P., & Van Hook, W.A.. Vapor pressure isotope effects in the benzene (B) --cyclohexane (C) system from 5 to 80 /sup 0/C. I. The pure liquids B-d/sub 0/,B-d/sub 1/,ortho-,meta-, and para-B-d/sub 2/, B-d/sub 6/,C-d/sub 0/, and C-d/sub 12/. II. Excess free energies and isotope effects on excess free energies in the solutions B-h/sub 6//B-d/sub 6/, C-h/sub 12//C-d/sub 12/, B-h/sub 6//C-h/sub 12/, B-d/sub 6//C-h/sub 12/, and B-h/sub 6//C-d/sub 12/. United States.
Jakli, G., Tzias, P., and Van Hook, W.A.. Sat . "Vapor pressure isotope effects in the benzene (B) --cyclohexane (C) system from 5 to 80 /sup 0/C. I. The pure liquids B-d/sub 0/,B-d/sub 1/,ortho-,meta-, and para-B-d/sub 2/, B-d/sub 6/,C-d/sub 0/, and C-d/sub 12/. II. Excess free energies and isotope effects on excess free energies in the solutions B-h/sub 6//B-d/sub 6/, C-h/sub 12//C-d/sub 12/, B-h/sub 6//C-h/sub 12/, B-d/sub 6//C-h/sub 12/, and B-h/sub 6//C-d/sub 12/". United States.
@article{osti_5120323,
title = {Vapor pressure isotope effects in the benzene (B) --cyclohexane (C) system from 5 to 80 /sup 0/C. I. The pure liquids B-d/sub 0/,B-d/sub 1/,ortho-,meta-, and para-B-d/sub 2/, B-d/sub 6/,C-d/sub 0/, and C-d/sub 12/. II. Excess free energies and isotope effects on excess free energies in the solutions B-h/sub 6//B-d/sub 6/, C-h/sub 12//C-d/sub 12/, B-h/sub 6//C-h/sub 12/, B-d/sub 6//C-h/sub 12/, and B-h/sub 6//C-d/sub 12/},
author = {Jakli, G. and Tzias, P. and Van Hook, W.A.},
abstractNote = {High precision measurements of the vapor pressure differences between some deuterated benzenes B-d/sub x/ (x=1, para-2, and 6) and protio benzene B-d/sub 0/; between para- and ortho-, and para- and meta-dideuterobenzene; and between perdeuterocyclohexane C-d/sub 12/ and protiocyclohexane C-d/sub 0/ were made from near the freezing point to the normal boiling point. The data are best represented as the logarithmic ratios ln R (d/sub 6/) =ln (P/sub d/0/P/sub d/6) =1226.5/T/sup 2/-12.178/T, ln R (para/ortho) =ln (P/sub parahyphend/2/P/sub orthohyphend/2) =2.6/T/sup 2/, and ln R (para/meta) =ln (P/sub parahyphend/2/P/sub metahyphend/2) =-2.0/T/sup 2/, together with the deviations from the law of the mean ..delta.. (d1) =6-(ln R (d/sub 6/)/lnR (d/sub 1/))=0.177-3.6 x 10/sup -4/t and ..delta.. (d/sub 2hyphenpara/=3-(ln R (d/sub 6/)/ln R (d/sub 2hyphenpara/))=0.028 +1.0 x 10/sup -4/t. The isotope effects are inverse and display significant deviations from the law of the mean. The cyclohexane results are given by ln R (C-d/sub 12/) =-2188.4/T/sup 2/-18.587/T. New measurements of the vapor pressures of benzene--cyclohexane solutions are also reported between 5 and 80 /sup 0/C. The data are in good agreement with the best earlier work. Excess free energies of the equimolar solutions B-h/sub 6//B-d/sub 6/ and C-h/sub 12//C-d/sub 12/ have been measured between 20 and 80 /sup 0/C. Suitable fits to the data yield the following results (30 /sup 0/C); G/sup ex/(B-h/B-d), G/sup ex/(C-h/C-d); H/sup ex/(B-h/B-d),},
doi = {},
journal = {J. Chem. Phys.; (United States)},
number = ,
volume = 68:7,
place = {United States},
year = {1978},
month = {4}
}