Sergiu Sima

Sergiu Sima
Polytechnic University of Bucharest | UPB · Department of Applied Physical Chemistry and Electrochemistry

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26
Publications
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146
Citations
Introduction

Publications

Publications (26)
Article
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In recent years, the dramatic increase of greenhouse gases concentration in atmosphere, especially of carbon dioxide, determined many researchers to investigate new mitigation options. Thermodynamic studies play an important role in the development of new technologies for reducing the carbon levels. In this context, our group investigated the phase...
Article
New isothermal vapor–liquid equilibrium (VLE) data for the carbon dioxide + 1,4-dioxane system are reported at four temperatures (323.15, 333.15, 343.15, and 353.15) K and pressures up to 122.7 bar. The critical curve was also measured up to 158.8 bar and 420.15 K. Phase behavior measurements were performed in a high-pressure windowed cell with var...
Article
Full-text available
In recent years we have focused our efforts on investigating various binary mixtures containing carbon dioxide to find the best candidate for CO2 capture and, therefore, for applications in the field of CCS and CCUS technologies. Continuing this project, the present study investigates the phase behavior of three binary systems containing carbon dio...
Chapter
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Carbon dioxide (CO2) is an important material in many industries but is also representing more than 80% of greenhouse gases (GHGs). Anthropogenic carbon dioxide accumulates in the atmosphere through burning fossil fuels (coal, oil, and natural gas) in power plants and energy production facilities, and solid waste, trees, and other biological materi...
Article
Full-text available
Liquid–liquid equilibrium data for ternary systems are scarce in literature, although they are important both for industry and simulations. Investigating ternary systems is usually costly and labor-intensive. We propose a nontraditional approach to determine liquid–liquid phase equilibrium in ternary systems. Our method generates tie line equilibri...
Article
New isothermal vapor–liquid equilibrium (VLE) data for the carbon dioxide + 2-octanol system are measured at five temperatures between 298.15 and 333.15 K and pressures up to 103 bar. The experimental method used is the static-analytical one with phases sampling. The new experimental data obtained in this study are compared with all available liter...
Article
New isothermal vapor–liquid equilibrium (VLE) and vapor–liquid–liquid equilibrium data for the carbon dioxide + 1-octanol system are reported at several temperatures, 303.15, 310.15, 315.15, 323.15, and 333.15 K, and pressures up to 145 bar. A static-analytical method with phase sampling was used. The experimental results of this study are compared...
Article
Bulletin of Romanian Chemical Engineering Society Volume 4, Issue 2, 2017, pp. 2-13 The purpose of this paper is to demonstrate the ability of a cubic equation model to predict the phase behavior of the carbon dioxide (1) + isopropanol (2) binary system. The model selected is the cubic General Equation of State – GEOS, coupled with classical van...
Article
Vapor–liquid (VLE) data for the carbon dioxide + 1,2-dimethoxyethane binary system at 313.15, 323.15, 333.15, and 343.15 K up to 10.69 MPa and the critical curve are reported for the first time. Phase behavior measurements were made in a high-pressure visual cell with variable volume, using a static-analytical method with phases sampling by rapid o...
Article
Full-text available
The ability of different thermodynamic models to predict the phase behavior of carbon dioxide (1) + 2-propanol (2) binary system is tested. The models chosen are Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) cubic equations of state (EOS), coupled with classical van der Waals mixing rules (two-parameter conventional mixing rule, 2PCMR) mixing ru...
Article
Full-text available
This study compares the ability of different thermodynamic models to calculate the phase behaviour of the carbon dioxide + cyclohexane binary system. All available literature data (47 data sets, 348 experimental points) for the aforementioned system were modelled with the General Equation of State (GEOS) and Soave-Redlich-Kwong (SRK) equations of s...
Article
An unexpected synthesis of 4,5,6,7,8,9-hexahydro-1,3-diazonine, using hexamethylenediamine and dimethylformamide, is presented. The cyclization process was explained as a two-step process involving formylation and subsequent intramolecular condensation. The scope of this process was demonstrated through the synthesis of two other nitrogen-containin...
Article
Full-text available
New vapor-liquid equilibria (VLE) data at 333.15, 343.15, and 353.15 K and pressures up to 130.0 bar are reported for the carbon dioxide + 2-methyl-1-propanol (isobutanol) system. The experimental method used in this work was a static analytical method with liquid and vapor phases sampling using a rapid online sampler injector (ROLSITM) coupled to...
Article
Full-text available
New vapor-liquid equilibria (VLE) data at 323.15, 333.15, 343.15, and 353.15 K and pressures up to 112.9 bar are reported for the carbon dioxide + 2-methyl-2-propanol system. The experimental method used in this work was a static analytical method with liquid and vapor phases sampling using a rapid online sampler injector (ROLSI™) coupled to a gas...
Article
Full-text available
The phase behavior of the carbon dioxide + cycloalkane mixtures usually receives low attention, though these systems are important for many industries, e.g. the carbon capture and storage. In this paper calculations results for the carbon dioxide + cyclopentane binary system are presented, based on SRK and PR cubic equations of state with classical...
Article
Full-text available
The purpose of this paper is to compare three cubic equations of state to model the phase behaviour of carbon dioxide + methanol system. All available literature data for carbon dioxide + methanol system were modeled with cubic equations of state (EoS) using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A sin...
Article
Full-text available
The purpose of this paper is to compare three cubic equations of state to model the phase behaviour of carbon dioxide + methanol system. All available literature data for carbon dioxide + methanol system were modeled with cubic equations of state (EoS) using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A sin...
Article
Full-text available
Density and refractive index have been experimentally determined for binary liquid mixtures of n-octane + 2-hexanol, n-octane + 2-octanol, and 2-hexanol + 2-octanol at 298.15 K and atmospheric pressure, over the whole composition range. A comparative study of several relations for predicting the refractive index of a liquid has been carried out to...
Article
Full-text available
Vapor-liquid equilibria (VLE) data at 343.2 and 363.2 K and pressures between 1 and 14 MPa, and critical data (pressure - temperature - composition) at pressures between 9 MPa and 14 MPa for the carbon dioxide + ethanol system are reported. The experimental method used in this work was a static analytical method with liquid phase sampling using a r...
Article
Full-text available
Vapour - Liquid equilibrium and thermophysical properties of methanol were predicted, along the saturation curve and in the single-phase region. Five cubic equations of state were used: Soave-Redlich-Kwong (SRK), Peng-Robinson (PR), Schmidt-Wenzel (SW), Freze et al. (Cl) and GEOS3C. A wide comparison with NIST recommended data was made. So far GEOS...
Article
Vapor–liquid equilibria (VLE) data at (323.2, 333.2, 343.2, 353.2 and 363.2) K and pressures between 0.85 and 10.9 MPa for the carbon dioxide + ethyl acetate system are reported. The experimental method used in this work was a static analytical method with liquid phase sampling using a rapid on-line sampler injector (ROLSI™) coupled to a gas chroma...
Article
Vapor-liquid equilibria (VLE) data at (333.2, 343.2, 363.2, and 373.2) K and pressures between (1.1 and 14.1) MPa and critical data (pressure-temperature-composition) at pressures between (9.1 and 13.9) MPa for the carbon dioxide + ethanol system are reported. The experimental method used in this work was a static analytical method with liquid phas...

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