Vapour pressures and excess Gibbs energies of o-xylene +, m-xylene +, p-xylene +, and isopropylbenzene + carbon tetrachloride at 303.15 K
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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.
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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 %.
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Mr=106.17, monoclinic, P21/n, a=5.806(2), b= 5.023 (1), c=11.215 (2)/~, fl=100.48(2) ° , V= 321.61 (14) A3, Z = 2, Dx = 1.096 gcm -3, A(Mo Ka)=0.71069/~,, /x =0.66cm -1, F(000) = 116, T= 180 K, R = 0.045 for 926 reflections [I > 2.5o-(I)]. The cell dimensions are confirmed by powder diffraction. No phase transition is observed between 110 and 273 K. The crystal data reported by Biswas [Indian J. Phys. (1960), 34, 263-271] are incorrect. The bond lengths and bond angles in p-xylene are equal to the corresponding values in toluene within experimental error. The aromatic ring is essentially planar and slightly deformed at the substituent side. The centre of symmetry in p-xylene coincides with the space-group centre. The p-xylene molecules are packed into chains along b by nearly equal van der Waals contacts between the six ring C atoms and one methyl H of a neighbouring molecule. The chains are held together by van der Waals forces. Because of the great resemblance of packing in p-xylene and a-toluene crystals, the possibility of the existence of solid solutions of toluene in p-xylene is proposed. This proposal is verified by measuring the p-xylenerich part of the phase diagram of the toluene/p-xylene system. Separation of pure p-xylene crystals from a mixture containing toluene seems unlikely.
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A combination of azo and acylamide ligands is used in the preparation of metal–organic frameworks. Light response research reveals that under UV–vis irradiation, the CO2 adsorption of 1 declines as much as 21.4%. 1 exhibits excellent CO2 adsorption selectivity over CH4, O2, CO, and N2 gasses with IAST selectivity of 21–580 at 293 K. This MOF also has promising potential in separation of xylene isomers in the liquid phase with the adsorption of p-xylene of 265.15, o-xylene of 101.25 and m-xylene of 0 mg g−1, respectively.
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Density, speed of sound, IR of binary mixture of o-xylene, m-xylene, p-xylene with t-butanol have been measure at 303.15 .The excess molar volume and excess Isentropic compressibility have been calculated from the experimental value.The experimental sound velocisity data have been analysed in terms of free length theory (FLT) and collision factor theory (CFT).The experimental result are discussed in terms of intermolecular interaction between unlike molecules
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