• Applied Chemistry for Engineering
• /
• v.20 no.1
• /
• pp.94-98
• /
• 2009

The bubble point pressures of dimethyl carbonate and carbon dioxide mixtures were measured by using a high-pressure experimental apparatus equipped with a variable-volume view cell, at various $CO_2$ compositions in the range of temperatures above the critical temperature of $CO_2$ and below the critical temperature of dimethyl carbonate. The experimental bubble point pressure data were correlated with the Peng-Robinson equation of state (PR-EOS) to estimate the corresponding dew point compositions at equilibrium with the bubble point compositions. The experimentally measured bubble point pressures gave good agreement with those calculated by the PR-EOS. The variable-volume view cell equipment was verified to be an easy and quick way to measure the bubble point pressures of high-pressure compressible fluid mixtures.

• 유학연구
• /
• v.44
• /
• pp.303-333
• /
• 2018

In this paper, Peng Xiao's analysis of his Waitan Alchemy method was conducted, using Zhouyi Chantongqi Fenzhangtongzhenyi as the main text. Unlike former President Zhouyi Chantongqi, Peng Xiao's president Zhoui Chantongqi is characterized by the simultaneous appearance of Neidan and Waitan. It reveals the characteristics of the course. The study of Zhouyi Chantong qi Fenzhangtongzhenyi explains the shift in Waitan and Neitan in Taoism and the change in terms of its meaning and terminology. In this paper, we looked at the basic principles of Alchemy in Zhouyi Chantongqi Fenzhangtongzhenyi, the three main tools of Alchemy : pots, drugs, and fire control. In addition, Huangtan, Liangtan and Xuantan, which were acquired in the specific process of Alchemy, were also identified through text analysis. Finally, we looked at the effects and effects of the Waitan's Alchemy. These studies will provide easier access to the Waitan language, which is more diverse than the original Wei Boyang's Zhouyi Chantongqi and other comments. Based on this, another in-depth study of the Neitan idea of Fenzhangtongzhenyi will be possible in the future.

• Korean Chemical Engineering Research
• /
• v.43 no.5
• /
• pp.637-640
• /
• 2005

The density of polar-nonpolar liquid mixtures composed of methyl tert-butyl ether(MTBE) and 2,2,4-trimethylpentane, and methyl ethyl ketone (MEK) and 2,2,4-trimethylpentane, and the density of polar-polar liquid mixture of MTBE and MEK were measured by densitometer at 278.15 K, 288.15 K and 298.15 K, respectively. The excess molar volume of the binary systems calculated from the measured density was shown good agreement with the calculated one by the cubic Peng-Robinson- Stryjek-Vera (PRSV) equation of state together with Huron-Vidal mixing rule and it confirmed that the cubic PRSV equation of state could be used in the molar volume calculation of polar mixture.

• Journal of Industrial Technology
• /
• v.19
• /
• pp.253-260
• /
• 1999

Two thermodynamic models were used to predict the partial molar volumes of solutes in supercritical carbon dioxide at infinite dilution: (1) the Peng-Robinson equation of state with various mixing rules including those based on $EOS/G^E$ (2) the Kirkwood Buff fluctuation integral with the hard sphere expansion (HSE) method. The Kirkwood-Buff fluctuation integral method, in which an equation of state for pure component and molecular parameters are required, produced better results especially near the critical point than the Peng-Robinson equation of state with the several mixing rules based an $EOS/G^E$. When the $EOS/G^E$ mixing rules were used, poorer results were obtained compared with the classical mixing rule and Kirkwood-Buff model.

• Korean Chemical Engineering Research
• /
• v.45 no.1
• /
• pp.46-51
• /
• 2007

In this study, computer simulations have been performed for the removal of the transformer oil contaminated with polychlorinated biphenyls (PCBs) in supercritical water through complete combustion reaction. We regarded n-decane as a main material of transformer oil, and it is assumed to be 3.0 wt％ of transformer oil in supercritical water. We used Peng-Robinson equation of state to estimate the physical properties of components in supercritical water. Throughout the computer simulation done in this work, we could explain the solubilities of 3.0 wt% of transformer oil and excess oxygen in supercritical water.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.18 no.11
• /
• pp.859-866
• /
• 2006

This paper presents the vapor-liquid equilibrium (VLE) data measured for carbon dioxide and propane mixtures. Their mixtures were considered as promising alternative refrigerants due to good thermophysical properties and negligible environmental impact. The isothermal VLE data were measured at eight temperatures ranging from 253.15 to 323.15 K in the circulation type equipment with a view cell. The binary system was found to be a zeotropic mixture in the tested temperature range and could be correlated with sufficient accuracy by using the Peng-Robinson equation of state (PR EoS) with the van der Waals one fluid mixing rule. A comparison with published experimental VLE data has been carried out by means of the PR equation of state. In addition, the phase behaviors of carbon dioxide and propane mixtures were analyzed based on the measured VLE data.

• 한국생태학회:학술대회논문집
• /
• 1998.05a
• /
• pp.82.1-82.1
• /
• 1998

• Proceedings of the Korea Society of Mathematical Education Conference
• /
• 1996.06a
• /
• pp.43-55
• /
• 1996

• Proceedings of the Optical Society of Korea Conference
• /
• 2001.08a
• /
• pp.170-171
• /
• 2001

No Abstract.See Full-text

• Korean Architects
• /
• s.594
• /
• pp.152-157
• /
• 2018