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Shinjuku, Japan

Matsuda H.,Nihon University | Yokoyama K.,Omega Simulation Co. | Kyuzaki H.,Nihon University | Kurihara K.,Nihon University | Tochigi K.,Nihon University
Journal of Chemical Engineering of Japan | Year: 2010

Isobaric vapor-liquid equilibria for the ethylbenzene + p-xylene system at 40.00, 66.66, and 93.32 kPa have been measured using a modified Rogalski-Malanowski equilibrium still. Parameters for the NRTL equation are determined from the experimental vapor-liquid equilibrium data. In addition, the number of columns and the reflux ratio needed for separation by distillation are estimated. The separation performance can be partially evaluated, even if the mixture is assumed to be an ideal solution. However, we find that the temperature distribution in the distillation column differs, and that consideration of the activity coefficients affects the selection of the feed location. © 2010 The Society of Chemical Engineers, Japan. Source


Matsuda H.,Nihon University | Kamihama N.,Nihon University | Kurihara K.,Nihon University | Tochigi K.,Nihon University | Yokoyama K.,Omega Simulation Co.
Journal of Chemical Engineering of Japan | Year: 2011

Isobaric vapor-liquid equilibria (VLE) were measured for four binary systems containing tetrahydrofuran (THF): THF+water, and three different mixtures of THF+n-alkane (n-pentane, n-hexane, and n-heptane). Measurements were conducted at pressures in the range 40.0-101.3kPa using a simple, automatic apparatus developed in our laboratory. From the experimental VLE data it was confirmed that the THF+water and THF+n-hexane systems formed minimum-boiling-point azeotropes, whereas the THF+n-pentane and THF+n-heptane systems were non-azeotropic mixtures. Non-random two-liquid (NRTL) parameters were also determined on the basis of the experimental VLE data. © 2011 The Society of Chemical Engineers, Japan. Source


Yokoyama K.,Omega Simulation Co. | Motohashi Y.,Nihon University | Matsuda H.,Nihon University | Kurihara K.,Nihon University | Tochigi K.,Nihon University
Journal of Chemical Engineering of Japan | Year: 2011

The compositions and the physical properties of mixtures are required to simulate multi-component batch distillation operations. In this study, temperature and accumulated distillate are measured as a function of time by use of a simple distillation apparatus. Initial compositions and physical parameters are estimated from this measurement data by a dynamic mathematical model, to examine the extent to which batch distillation operations can be predicted. For an ideal and a non-ideal solution system, the following three types of value estimation are examined: (I) compositions only, (II) parameters of one component, and (III) compositions and parameters of one component. The compositions could be estimated with sufficient accuracy. As for the physical properties, after devising a method for reducing the number of parameters, it is found that a batch distillation operation can be industrially designed from the estimated results. © 2011 The Society of Chemical Engineers, Japan. Source


Yokoyama K.,Omega Simulation Co. | Matsuda H.,Nihon University | Kurihara K.,Nihon University | Tochigi K.,Nihon University
Kagaku Kogaku Ronbunshu | Year: 2013

The Antoine constants and the NRTL parameters were determined for a system of water+ propyleneglycol monomethyl ether (PGME)+ propyleneglycol monomethyl ether acetate (PGMEA) using automatic vapor-liquid equilibrium measuring equipment. First, the NRTL parameters of a methanol+ ethanol+ water system and an acetone+ methanol+ water system were determined using the equipment. With these parameters, a distillate curve map was plotted to trace the vapor phase compositions of the residual curve map calculations, and this map was compared with the distillate trajectory of batch distillation. For the system of water+ PGME+ PGMEA, the distillate trajectory of batch distillation was examined by drawing the distillate curve map for the case in which the distillate in the region of liquid- liquid equilibrium was divided into two phases and the oil phase was returned to the still. These studies showed the possibility of evaluating batch distillation for systems with unknown physical properties using this equipment and the distillate curve map. © 2013 The Society of Chemical Engineers, Japan. Source


Yumoto T.,Omega Simulation Co. | Ootakara S.,Mitsui Chemical Inc. | Seki H.,Tokyo Institute of Technology | Hashimoto Y.,Nagoya Institute of Technology | And 3 more authors.
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2010

A dynamic simulator for the benchmark vinyl acetate (VAc) monomer production process is introduced. Rigorous first-principles dynamic models of the VAc process are implemented on the commercial software package Visual Modeler (Omega Simulation Co., Ltd.). The simulator employs pressure flow calculations and considers non-idealities in the process equipment, so that more realistic simulations are made possible, compared with the conventional simulators. The simulator's high performance calculation provides an environment where feasibility and performance of designed control systems can be efficiently evaluated without sacrificing high fidelity of the process model. The developed simulator will be made available in the public domain with a free limited license of Visual Modeler. © 2009 IFAC. Source

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