Isobaric Vapor–Liquid Equilibrium for Binary Systems of 2,2,4-Trimethylpentane with o-Xylene, m-Xylene, p-Xylene, and Ethylbenzene at 250 kPa
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Abstract:
Isobaric vapor–liquid equilibrium (VLE) data were determined at the pressure of 250 kPa for the four binary mixtures composed of 2,2,4-trimethylpentane (isooctane) + para-, ortho-, or meta-xylene and ethylbenzene (EB) by using a circulation-type apparatus, in which both vapor and liquid phases are recirculated. The vapor- and liquid-phase compositions were analyzed by gas chromatography. All of the data were found to be thermodynamically consistent according to the Herington, van Ness, infinite dilution, and pure component consistency tests. The experimental data were regressed with Aspen Plus 7.3, and binary interaction parameters were reported for the most frequently used activity coefficient models: the nonrandom two-liquid (NRTL) and the universal quasichemical activity coefficient (UNIQUAC) models, respectively. All of the calculated values with these models showed good agreement with the experimental data, as well as with available isobaric and isothermal data from the literature.Keywords:
Isobaric process
p-Xylene
m-Xylene
o-Xylene
Vapor–liquid equilibrium
Isobaric binary vapor–liquid equilibrium (VLE) data for 1-butanol + ethylbenzene, or o-, or m-, or p-xylene and isobaric quinary VLE data for 1-butanol + ethylbenzene + o-xylene + m-xylene + p-xylene are measured at 101.33 kPa using a modified Rose cell with circulation of both phases. The four binary systems of 1-butanol + ethylbenzene, or o-, or m-, or p-xylene exhibit minimum boiling azeotropes, and the composition of the azeotropes are reported. The VLE data for the four binary systems are checked to meet rigorous thermodynamic consistency by Herington method and the point-to-point test of the Fredenslund method. The nonideality in vapor phase of the measured binary systems is analyzed through calculating fugacity coefficients. Combined with the Hayden–O'Connell (HOC) equation, the VLE data for 1-butanol + ethylbenzene, or o-, or m-, or p-xylene are well-correlated by the nonrandom two-liquid (NRTL), universal quasichemical activity coefficient (UNIQUAC), and Wilson equations. The NRTL model parameters obtained from correlation are used to predict the VLE data of the quinary system. According to the average absolute deviation values, the obtained quinary predicted values are in good agreement with the experimental values.
UNIQUAC
Isobaric process
Quinary
p-Xylene
Vapor–liquid equilibrium
Boiling point
UNIFAC
m-Xylene
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The feasibility of simultaneous measurement of important components such as o-xylene, m-xylene, p-xylene, ethylbenzene, toluene, aliphatic hydrocarbons, and total C 9 –C 10 aromatic hydrocarbons in the p-xylene production process is investigated. Mixtures of those components were prepared to simulate concentration levels in actual p-xylene processes, and near-infrared (NIR) spectra were collected from mixtures over the spectral range of 1100 to 2500 nm. Even with the very similar spectral features of xylene isomers and other aromatic compounds, the concentrations of each of the components in the mixtures are accurately predicted by using a partial least-squares (PLS) algorithm and show excellent correlation with conventional gas chromatographic analysis. The results clearly demonstrate the possibility of using NIR spectroscopy for monitoring the major components in an actual p-xylene production process for process control and optimization.
p-Xylene
m-Xylene
o-Xylene
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The solubilities of vitamin K3 in benzene, toluene, ethylbenzene, o-xylene, m-xylene, and p-xylene have been measured using a static equilibrium method from (299.44 to 344.24) K. The experimental data were correlated against temperature with the absolute average deviations less than 1.0 %.
m-Xylene
p-Xylene
o-Xylene
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Experimental data on density and viscosity at 303.15 and 323.15 K are presented for the binary mixtures of sulfolane + benzene, toluene, ethylbenzene, p-xylene, o-xylene, and m-xylene. From these data, excess molar volumes and deviations in viscosity have been calculated. The computed quantities have been fitted to the Redlich−Kister equation to derive the coefficients and estimate the standard error values. The results are discussed in terms of the intermolecular interactions.
Sulfolane
p-Xylene
o-Xylene
m-Xylene
BTEX
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The densities and viscosities for binary mixtures of vitamin K3 + benzene, toluene, ethylbenzene, o-xylene, m-xylene, and p-xylene, respectively, have been determined experimentally under normal atmospheric pressure over the entire molality range from (303.15 to 333.15) K. The apparent molar volumes of vitamin K3 were calculated from experimental measurements. Results were fit to obtain the appropriate parameters and standard deviations between the measured and fitted values.
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p-Xylene
m-Xylene
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBenzene, Toluene, Ethylbenzene, o-Xylene, m-Xylene, and p-XyleneD. D. Tunnicliff, R. R. Brattain, and L. R. ZumwaltCite this: Anal. Chem. 1949, 21, 8, 890–894Publication Date (Print):August 13, 1949Publication History Published online1 May 2002Published inissue 13 August 1949https://pubs.acs.org/doi/10.1021/ac60032a002https://doi.org/10.1021/ac60032a002research-articleACS PublicationsRequest reuse permissionsArticle Views1438Altmetric-Citations23LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
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Isobaric vapor–liquid equilibrium (VLE) data were determined at the pressure of 250 kPa for the four binary mixtures composed of 2,2,4-trimethylpentane (isooctane) + para-, ortho-, or meta-xylene and ethylbenzene (EB) by using a circulation-type apparatus, in which both vapor and liquid phases are recirculated. The vapor- and liquid-phase compositions were analyzed by gas chromatography. All of the data were found to be thermodynamically consistent according to the Herington, van Ness, infinite dilution, and pure component consistency tests. The experimental data were regressed with Aspen Plus 7.3, and binary interaction parameters were reported for the most frequently used activity coefficient models: the nonrandom two-liquid (NRTL) and the universal quasichemical activity coefficient (UNIQUAC) models, respectively. All of the calculated values with these models showed good agreement with the experimental data, as well as with available isobaric and isothermal data from the literature.
Isobaric process
p-Xylene
m-Xylene
o-Xylene
Vapor–liquid equilibrium
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Vapor–liquid equilibrium (VLE) data for binary systems of 2-methyl-1-butanol with ethylbenzene and xylene isomers are isobarically obtained with a modified Rose still at 101.33 kPa, as well as for the quinary system of 2-methyl-1-butanol + ethylbenzene + xylene isomers. The binary VLE data are considered to be thermodynamically consistent according to the Herington method and the point-to-point test. Taking the nonideality of the vapor phase into consideration, the activity coefficients are calculated. All systems show positive deviation from ideality. The VLE data are correlated using the nonrandom two-liquid (NRTL), universal quasichemical activity coefficient (UNIQUAC), and Wilson models. The calculated vapor-phase compositions and temperature agree well with the experimental values. The obtained model parameters of the binary systems are used to predict the VLE data for the quinary system. The results indicate that these three models allow a good prediction of the phase equilibrium for the quinary system.
Quinary
UNIQUAC
Vapor–liquid equilibrium
UNIFAC
m-Xylene
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Consistent vapor−liquid equilibria (VLE) data have been determined at (5 and 15) kPa for the binary systems styrene + ethylbenzene, + o-xylene, + m-xylene, and + p-xylene in the temperature range (324 to 359) K. The binary systems exhibit very slight deviations from ideal behavior, and no azeotrope is present. The VLE data were well-correlated by the Wilson, NRTL, and UNIQUAC equations.
UNIQUAC
Isobaric process
Azeotrope
m-Xylene
p-Xylene
Vapor–liquid equilibrium
UNIFAC
o-Xylene
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Isobaric binary vapor–liquid equilibrium (VLE) data for ethylbenzene + ethyl benzoate, o-xylene + ethyl benzoate, m-xylene + ethyl benzoate, and p-xylene + ethyl benzoate, as well as the quinary VLE data for ethyl benzoate + o-xylene + m-xylene + p-xylene + ethylbenzene, were measured at 101.33 kPa using a modified Rose still. The thermodynamic consistency test was implemented by using the Herington method. Moreover, the VLE data for ethyl benzoate + o-xylene, ethyl benzoate + m-xylene, ethyl benzoate + p-xylene, and ethyl benzoate + ethylbenzene were correlated using the nonrandom two-liquid (NRTL) and universal quasichemical activity coefficient (UNIQUAC) models using the nonlinear least-square method. The obtained NRTL and UNIQUAC model parameters of the binary systems were utilized to predict the VLE data for the quinary system. It was shown that all the models showed a relatively small deviation from the experimental results, and the quinary predicted values obtained in this way agreed well with the experimental values, indicating that the experimental data were suitable for designing the extractive distillation process of ethyl benzoate with ethylbenzene and xylene isomers.
UNIQUAC
Ethyl benzoate
p-Xylene
Isobaric process
Quinary
Vapor–liquid equilibrium
Benzoic acid
Methyl benzoate
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