Document type
Conference papers
Document subtype
Abstract
Title
Complex and not so complex systems for SDG´s solutions
Participants in the publication
Maria José V. Lourenço (Author)
Dep. Química e Bioquímica
CQE
Summary
This keynote aims to show that the accurate measurement of thermophysical properties is a very important factor in making energy decisions, especially when working above 200 °C. Possible systems used for heat transfer and storage are presented, in different temperature ranges, at low pressures, based on molten salts, ionic liquids, and nanofluids. The in-depth knowledge of these properties in molten salts and ionic liquids, with or without the addition of nanomaterials could quickly contribute to increase, for example, the performance of some solar systems, heat transfer fluids, heat storage and/or nuclear energy plants [1,2]. Society faces a complex mission in the development of energy-efficient, low-polluting systems (CO2 footprint), with secondary resources which should be based, whenever possible, on a sustainable circular economy without environmental damage or human risk. In fact, it is understood that the future of chemical industry must be mainly driven by the sun [3], which complicates the safety rules issue. It should be noted that most of the equipment operating with these materials (of which the purity, contaminants, concentration, toxicology, ecotoxicology are unknown) perform their function based on very old experimental/theoretical results, never questioning whether they are still the most appropriate.\nDue to the main characteristics of molten salts, such as stability at high temperatures, low vapor pressure, liquid state over a wide range of temperatures, ability to dissolve many inorganic and organic compounds, generally low viscosity, and high heat capacity per unit volume [1], their use has increased in energy production plants with solar incidence. On the other hand, ionic liquids have a wide range of properties that give them enormous technological flexibility and make them convenient for applications in low and medium range temperatures, when mass flow is important, but they generally have higher viscosities and can degrade at temperatures higher than 250 ºC. Its industrial use depends on the cost/kg of its production, still high today. However, by blending the ionic liquid with water, significant decrease in viscosity is achieved and cost decreased [4].\nThus, the strictly measured thermophysical properties combined with the safety data of some nanosystems (synthetic and/or natural) are discussed for the near future, which is intended to be sustainable in terms of resources, health, and environmental protection, paving the way for more efficient industries, less polluting and recyclable, in the light of the 2030 UN Agenda\n\n\n[1] V. Nunes, M. Lourenço, F. Santos, C. A. Nieto Castro, Applied Energy, 2019, 242, 1626. \n[2] F. Bioucas, S. Vieira, M. Lourenço, F. Santos, M. Lopes, C. A. Nieto Castro, K. Massonne, Ind. Eng. Chem. Res., 2018, 57, (25), 8541.\n[3] A. González-Garay, N. Mac Dowell and N. Shah, Discov Chem Eng, 2021, 1, 2.\n[4] F. Bioucas, C. Queirós, D. Lozano-Martín, M. Ferreira, X. Paredes, A. Santos, F. Santos, M. Lopes, M. Lampreia, M. Lourenço, C. Nieto Castro and K. Massonne, Ind. Eng. Chem. Res., 2022, 61, (5), 2280.\n\n\n[1] V. Nunes, M. Lourenço, F. Santos, C. A. Nieto Castro, Applied Energy, 2019, 242, 1626. \n[2] F. Bioucas, S. Vieira, M. Lourenço, F. Santos, M. Lopes, C. A. Nieto Castro, K. Massonne, Ind. Eng. Chem. Res., 2018, 57, (25), 8541.\n[3] A. González-Garay, N. Mac Dowell and N. Shah, Discov Chem Eng, 2021, 1, 2.\n[4] F. Bioucas, C. Queirós, D. Lozano-Martín, M. Ferreira, X. Paredes, A. Santos, F. Santos, M. Lopes, M. Lampreia, M. Lourenço, C. Nieto Castro and K. Massonne, Ind. Eng. Chem. Res., 2022, 61, (5), 2280.\n
Date of Publication
2023-07-09
Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Event
38th International Conference on Solution Chemistry, Belgrade, Serbia, 09-14 July 2023
Publication Identifiers
ISBN - 9788670316249
Address
Belgrade, Serbia
Organizers
University of Novi Sad, Faculty of Sciences
Publisher
University of Novi Sad, Faculty of Sciences
Number of pages
1
Starting page
12
Document Identifiers
ISBN - 978-86-7031-624-9
Awards
Keynote Address