Dimitrios M. Tsangaris

Bio: Dimitrios M. Tsangaris is an academic researcher from University College London. The author has contributed to research in topics: Pipeline transport & Pipeline (software). The author has an hindex of 7, co-authored 9 publications receiving 235 citations.

Evaluation of Cubic, SAFT, and PC-SAFT Equations of State for the Vapor–Liquid Equilibrium Modeling of CO2 Mixtures with Other Gases

Abstract: Accurate thermodynamic models for phase equilibria calculations of carbon dioxide mixtures with other gases are of high importance for the safe and economic design of carbon capture and storage (CCS) technologies. In this work, we assess the capability of Redlich–Kwong (RK), Soave–Redlich–Kwong (SRK), Peng–Robinson (PR) cubic equations of state (EoS), as well as Statistical Associating Fluid Theory (SAFT) and Perturbed-Chain SAFT (PC-SAFT) in modeling vapor–liquid equilibria for binary mixtures of CO2 with CH4, N2, O2, SO2, Ar, and H2S, and for the ternary mixture CO2–N2–O2. Liquid density calculations for some of these mixtures are also performed. Experimental data available are used to assess the accuracy of the models. Two different expressions are used for the calculation of parameter α in PR EoS. PC-SAFT is, on average, more accurate than cubic EoS and SAFT when no binary interaction parameter is used. However, when a binary interaction parameter fitted to the experimental data is used, model correla...

Thermodynamic and transport property models for carbon capture and sequestration (CCS) processes with emphasis on CO2 transport

Abstract: Carbon capture and sequestration (CCS) is one of the most promising technologies for the reduction of carbon dioxide (CO 2 ) concentration in the atmosphere, so that global warming can be controlled and eventually eliminated. A crucial part in the CCS process design is the model that is used to calculate the physical properties (thermodynamic, transport etc.) of pure CO 2 and CO 2 mixtures with other components. In this work, an overview of various thermodynamic models together with calculations from cubic and higher order equations of state (EoS) are provided. Calculations are compared to experimental data and a discussion on the accuracy of the models is given. The CO 2 mixture properties studied include phase equilibria, density, isothermal compressibility, speed of sound, and Joule–Thomson inversion curve. The Peng–Robinson, Soave–Redlich–Kwong, and the Perturbed Chain-Statistical Associating Fluid Theory (PC-SAFT) are the EoS used for the calculations. In addition, various models for transport properties are discussed and calculations for viscosity and diffusion coefficient are presented.

Carbon capture and storage (CCS): the way forward

Abstract: Carbon capture and storage (CCS) is broadly recognised as having the potential to play a key role in meeting climate change targets, delivering low carbon heat and power, decarbonising industry and, more recently, its ability to facilitate the net removal of CO2 from the atmosphere. However, despite this broad consensus and its technical maturity, CCS has not yet been deployed on a scale commensurate with the ambitions articulated a decade ago. Thus, in this paper we review the current state-of-the-art of CO2 capture, transport, utilisation and storage from a multi-scale perspective, moving from the global to molecular scales. In light of the COP21 commitments to limit warming to less than 2 °C, we extend the remit of this study to include the key negative emissions technologies (NETs) of bioenergy with CCS (BECCS), and direct air capture (DAC). Cognisant of the non-technical barriers to deploying CCS, we reflect on recent experience from the UK's CCS commercialisation programme and consider the commercial and political barriers to the large-scale deployment of CCS. In all areas, we focus on identifying and clearly articulating the key research challenges that could usefully be addressed in the coming decade.

A systematic review on CO2 capture with ionic liquids: Current status and future prospects

Abstract: Global warming due to the emission of greenhouse gases, especially carbon dioxide (CO2), has a significant effect on the climate change and has become a widespread concern in the recent years. Carbon capture, utilization, and sequestration (CCUS) strategy appears to be effective in decreasing the carbon dioxide level in the atmosphere. Despite a great progress in this field, there are still major limitations in commercialized the CO2 capture methods that rely on absorption phenomena. High capital costs of for the CO2 capture, low absorption and desorption rates (which require large facilities), solvent losses due to evaporation, and the use of corrosive solvents are among main obstructions. Recently, CO2 capture with ionic liquids (ILs) has appreciably attracted researchers’ attention. The distinct properties of ILs such as negligible vapor pressure and their affinity to capture the CO2 molecules make them a feasible alternative for currently available solvents including, different amines. This paper covers a brief review of previous engineering and research works on various CO2 capture techniques, the description of CO2 capture process using ILs, mechanisms of the CO2 capture with ILs at molecular level, CO2 and ILs properties, characterization of the CO2/IL systems, impacts of operating and fluids conditions on CO2 absorption capacity by ILs, and CO2 solubility and selectivity in ILs. Moreover, the technical and economic aspects of the CO2 capture with ILs, screening criteria for ILs/CO2 systems, and important results obtained from previous studies will form the last parts of this manuscript. This review offers a proper/systematic guideline that assists researchers and engineers to comprehensively understand and to effectively design the CO2/ILs processes, focusing on the thermodynamic and mass transfer aspects.

Group Contribution Method for Viscosities Based on Entropy Scaling Using the Perturbed-Chain Polar Statistical Associating Fluid Theory

Abstract: In this work, we propose a new predictive entropy-scaling approach for Newtonian shear viscosities based on group contributions. The approach is based on Rosenfeld’s original work [Rosenfeld, Y. Phys. Rev. A 1977, 15, 2545−2549]. The entropy scaling is formulated as third order polynomial in terms of the residual entropy as calculated from a group-contribution perturbed-chain polar statistical associating fluid theory (PCP-SAFT) equation of state. In this study, we analyze the course of entropy scaling parameters within homologous series and suggest suitable mixing rules for the parameters of functional groups. The viscosity of nonpolar, of polar, and of self-associating (hydrogen bonding) components are considered. In total, 22 functional groups are parametrized to viscosity data of 110 pure substances, from 12 different chemical families. The mean absolute relative deviations (MADs) to experimental viscosity data are typically around 5%. For three chemical families, namely, branched alkanes, 1-alcohols,...