{"title":"Binary Mixtures of n-Alkylbenzenes and Pentadecane: Densities, Speeds of Sound, and Viscosities within the Range of 288.15 and 333.15 K and at 0.1 MPa","authors":"Dianne J. Luning\r\nPrak*, and , Jim S. Cowart, ","doi":"10.1021/acs.jced.5c00217","DOIUrl":null,"url":null,"abstract":"<p >The physical properties of mixtures of alkanes and aromatic compounds can aid in the understanding and modeling of their combustion in engines. Herein, densities, viscosities, and speeds of sound of binary mixtures of <i>n</i>-alkylbenzenes with pentadecane and their corresponding excess molar volumes (<i>V</i><sub>m</sub><sup>E</sup>), excess speeds of sound (<i>c</i><sup>E</sup>), excess isentropic compressibilities (Κ<sub>s</sub><sup>E</sup>), and viscosity deviations (Δη) are reported. In general, mixture densities, viscosities, and speeds of sound increased monotonically with changing mole fractions, except for the speeds of sound of toluene, ethylbenzene, propylbenzene, and butylbenzene mixtures. These properties can be used for fuel modeling purposes. <i>V</i><sub>m</sub><sup>E</sup>’s, Δη’s, <i>c</i><sup>E</sup>’s, and <i>K</i><sub>s</sub><sup>E</sup>’s ranged from 0.04 to 0.56 cm·mol<sup>–1</sup>, −0.14 to 0.09 mPa·s, −14.8 to 2.5 m·s<sup>–1</sup>, and −2.2 to 18.1 TPa<sup>–1</sup>, respectively. Increasing the <i>n</i>-alkylbenzene size (up to decylbenzene) caused the equimolar mixture’s <i>V</i><sub>m</sub><sup>E</sup>’s, Δη’s, and <i>K</i><sub>s</sub><sup>E</sup>’s to decrease and <i>c</i><sup>E</sup>’s to increase at 293.15 K. The properties of smaller <i>n</i>-alkylbenzene molecules were more affected by the aromatic group. In comparison with <i>n</i>-alkylcyclohexane/pentadecane mixtures, <i>n</i>-alkylbenzene/pentadecane mixture Δη trends were similar, but <i>V</i><sub>m</sub><sup>E</sup>’s, <i>c</i><sup>E</sup>’s, and <i>K</i><sub>s</sub><sup>E</sup>’s trends were different, suggesting that molecular interactions of the benzyl and cyclohexyl groups affect volume and compressibility more than they affect viscosity.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":"70 9","pages":"3527–3544"},"PeriodicalIF":2.1000,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acs.jced.5c00217","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical & Engineering Data","FirstCategoryId":"1","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.jced.5c00217","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The physical properties of mixtures of alkanes and aromatic compounds can aid in the understanding and modeling of their combustion in engines. Herein, densities, viscosities, and speeds of sound of binary mixtures of n-alkylbenzenes with pentadecane and their corresponding excess molar volumes (VmE), excess speeds of sound (cE), excess isentropic compressibilities (ΚsE), and viscosity deviations (Δη) are reported. In general, mixture densities, viscosities, and speeds of sound increased monotonically with changing mole fractions, except for the speeds of sound of toluene, ethylbenzene, propylbenzene, and butylbenzene mixtures. These properties can be used for fuel modeling purposes. VmE’s, Δη’s, cE’s, and KsE’s ranged from 0.04 to 0.56 cm·mol–1, −0.14 to 0.09 mPa·s, −14.8 to 2.5 m·s–1, and −2.2 to 18.1 TPa–1, respectively. Increasing the n-alkylbenzene size (up to decylbenzene) caused the equimolar mixture’s VmE’s, Δη’s, and KsE’s to decrease and cE’s to increase at 293.15 K. The properties of smaller n-alkylbenzene molecules were more affected by the aromatic group. In comparison with n-alkylcyclohexane/pentadecane mixtures, n-alkylbenzene/pentadecane mixture Δη trends were similar, but VmE’s, cE’s, and KsE’s trends were different, suggesting that molecular interactions of the benzyl and cyclohexyl groups affect volume and compressibility more than they affect viscosity.
期刊介绍:
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.