@article{MTMT:34533649, title = {A new, automated method for the investigation of melting point depression under carbon dioxide pressure}, url = {https://m2.mtmt.hu/api/publication/34533649}, author = {Arany, Dóra and Kőrösi, Márton and Kózelné Székely, Edit}, doi = {10.1016/j.jcou.2023.102663}, journal-iso = {J CO2 UTIL}, journal = {JOURNAL OF CO2 UTILIZATION}, volume = {80}, unique-id = {34533649}, issn = {2212-9820}, abstract = {The aim of this work was to develop a new, automated method for the detection of solid-liquid phase transitions in the presence of high-pressure carbon dioxide. This is allowed because of the dissolution of the medium in the sample during the solid-liquid-gas equilibrium measurement. The pressure of an empty reference cell and one containing a solid sample is compared by a differential pressure transmitter. A gradual heating program is conducted after their equal pressurization. The solid-liquid transition of the sample is marked by a sharp decrease in the pressure of the sample holder (compared to the reference cell). A processing algorithm for the recorded time – temperature – pressure-difference data was implemented, to determine the melting temperature range accurately and automatically. The apparatus was validated with racemic ibuprofen and benzoic acid, and provides a new, objective, and easy-to-automate alternative to determine the melting temperature in high-pressure carbon dioxide. © 2024}, keywords = {VALIDATION; VALIDATION; Carbon Dioxide; phase transition; benzoic acid; high pressure; high pressure; Detection; Detection; melting point; Liquefied gases; solid/liquid; Melting temperature; Automated methods; High-pressure carbon dioxide; Solid-liquid phase transitions; Carbon dioxide pressures; Gas equilibrium; Melting point depressions}, year = {2024}, eissn = {2212-9839}, orcid-numbers = {Kőrösi, Márton/0000-0002-1224-4788; Kózelné Székely, Edit/0000-0002-6935-0071} } @article{MTMT:34470949, title = {Continuous Stripping with Dense Carbon Dioxide}, url = {https://m2.mtmt.hu/api/publication/34470949}, author = {Kőrösi, Márton and Kántor, Petra and Bana, Péter and Kózelné Székely, Edit}, doi = {10.1021/acsomega.3c06087}, journal-iso = {ACS OMEGA}, journal = {ACS OMEGA}, volume = {8}, unique-id = {34470949}, issn = {2470-1343}, abstract = {The integration of flow chemistry into continuous manufacturing requires efficient, controllable, and continuous methods for the concentration of diluted solutions on relatively small scales. The design and application examples of a new continuous solvent removal process are presented. The continuous stripping method employing dense carbon dioxide is based on the formation of homogeneous mixtures of dilute organic solutions of the target molecules with a large excess of carbon dioxide at temperatures as low as 35 °C and pressures around 10 MPa. Subsequent pressure reduction results in the quick release of carbon dioxide and vaporization of a significant fraction of the organic solvent. The concentration of the solute in the separated liquid phase can be up to 40 times higher than in the feed. Among the many controllable process parameters, the most significant ones are the mass-flow rate ratio of carbon dioxide to the feed and the temperature of the phase separator. By careful setting of the operational parameters, the degree of concentration enhancement may be accurately controlled. The new apparatus─despite consisting of laboratory equipment and being built in a fume hood─could easily support pilot-scale synthetic flow chemistry, being a continuous, efficient alternative to thermal concentration methods. © 2023 The Authors. Published by American Chemical Society}, year = {2023}, eissn = {2470-1343}, pages = {46757-46762}, orcid-numbers = {Kőrösi, Márton/0000-0002-1224-4788; Kózelné Székely, Edit/0000-0002-6935-0071} } @book{MTMT:34042163, title = {19th European Meeting on Supercritical Fluids. EMSF 2023}, url = {https://m2.mtmt.hu/api/publication/34042163}, isbn = {9789634219248}, editor = {Kózelné Székely, Edit}, publisher = {Budapesti Műszaki és Gazdaságtudományi Egyetem}, unique-id = {34042163}, year = {2023}, orcid-numbers = {Kózelné Székely, Edit/0000-0002-6935-0071} } @article{MTMT:33663382, title = {Experimental Determination of a Chiral Ternary Solubility Diagram and Its Interpretation in Gas Antisolvent Fractionation}, url = {https://m2.mtmt.hu/api/publication/33663382}, author = {Kőrösi, Márton and Varga, Csaba and Tóth, Péter and Buczkó, Noémi and Varga, Erzsébet and Kózelné Székely, Edit}, doi = {10.3390/molecules28052115}, journal-iso = {MOLECULES}, journal = {MOLECULES}, volume = {28}, unique-id = {33663382}, issn = {1420-3049}, abstract = {Although crystallization has been widely applied for the enantiomeric enrichment of non-racemates both in research and in industrial applications, the physical–chemical background of chiral crystallizations is not as frequently discussed. A guide for the experimental determination of such phase equilibrium information is lacking. In the current paper, the experimental investigation of chiral melting phase equilibria, chiral solubility phase diagrams and their application in atmospheric and supercritical carbon dioxide-assisted enantiomeric enrichment is described and compared. Benzylammonium mandelate is a racemic compound; it shows eutectic behavior when molten. A similar eutonic composition was observed in its methanol phase diagram at 1 °C. The influence of the ternary solubility plot could be unequivocally discovered in atmospheric recrystallization experiments, which proved that the crystalline solid phase and the liquid phase were in an equilibrium. The interpretation of the results obtained at 20 MPa and 40 °C, using the methanol–carbon dioxide mixture as a pseudo-component, was more challenging. Although the eutonic composition was found to be the limiting enantiomeric excess value in this purification process as well, the high-pressure gas antisolvent fractionation results were only clearly thermodynamically controlled in certain concentration ranges.}, year = {2023}, eissn = {1420-3049}, orcid-numbers = {Kőrösi, Márton/0000-0002-1224-4788; Kózelné Székely, Edit/0000-0002-6935-0071} } @{MTMT:33674854, title = {Új, automatizálható, nyomás alatti olvadáspont mérő műszer fejlesztése}, url = {https://m2.mtmt.hu/api/publication/33674854}, author = {Arany, Dóra and Kőrösi, Márton and Kózelné Székely, Edit}, booktitle = {XLV. Kémiai Előadói Napok}, unique-id = {33674854}, year = {2022}, orcid-numbers = {Kózelné Székely, Edit/0000-0002-6935-0071} } @article{MTMT:33215064, title = {Supercritical carbon dioxide assisted synthesis of ultra-stable sulfur/carbon composite cathodes for Li– S batteries}, url = {https://m2.mtmt.hu/api/publication/33215064}, author = {SHIVA SHANKAR, LAKSHMI and Zalka, Dóra and Szabó, Tamás and Kózelné Székely, Edit and Kőrösi, Márton and Pászti, Zoltán and Balázsi, Katalin and Illés, Levente and Czigány, Zsolt and Kun, Róbert}, doi = {10.1016/j.mtchem.2022.101240}, journal-iso = {MATER TODAY CHEM}, journal = {MATERIALS TODAY CHEMISTRY}, volume = {26}, unique-id = {33215064}, issn = {2468-5194}, abstract = {To mitigate the shuttle effect and enhance the electrical conductivity in lithium battery cathode, the unique characteristics of supercritical CO2 solvent (SC–CO2) and the distinctive porous and layered microstructure of reduced graphene oxide (rGO) are exploited in the fabrication of a high-performance rGO/sulfur composite cathode. Exploiting SC-CO2 technology can realize highly efficient sulfur transfer and precise microstructure regulation of S/C composite cathodes for Li–S batteries. On exposure, due to the sudden pressure release process, the SC-CO2 expands the interlayers of rGO rendering plenty of storage space for small sulfur allotropes in carbon matrices which increases the active sulfur loading. Being a remarkable hydrophobic solvent, the wetting properties of SC-CO2 are excellent, ensuring sulfur dissolution and penetration deep into the voids and interlayers of rGO. This creates intimate contact of sulfur with rGO interlayers, guaranteeing precise sulfur content, uniform sulfur distribution, and strong interaction between sulfur and carbon leading to enhanced electrical conductivity and sulfur utilization efficiency. Another important feature is that the S/C composites can be prepared at room temperature, unlike other conventional techniques which require a higher temperature. Moreover, the product mixture can be separated simply by de-pressuring SC-CO2. Herein, the rGO/sulfur composite cathode prepared on a lab scale showed an initial discharge capacity of 1024 mAh/g at 0.1C rate with capacity retention of 92.2% and coulombic efficiency of 99% even after 200 charge-discharge cycles. The developed cells showed excellent performance (929 mAh/g at 1 C rate) with an ultralow decay of 0.04% per cycle even after 200 charge-discharge cycles. Through this work, we believe that the synergistic effect of SC-CO2 technology and rGO as sulfur host will open up a promising future for the synthesis of efficient S/C composite cathodes with ultra-high cycling stability.}, keywords = {REDUCED GRAPHENE OXIDE; supercritical fluid; Li-S battery; Sulfur cathode; Carbon–sulfur composite; Polysulfide confinement}, year = {2022}, eissn = {2468-5194}, orcid-numbers = {SHIVA SHANKAR, LAKSHMI/0000-0003-0832-4387; Szabó, Tamás/0000-0001-8182-640X; Kózelné Székely, Edit/0000-0002-6935-0071; Kőrösi, Márton/0000-0002-1224-4788; Balázsi, Katalin/0000-0002-8929-9672; Czigány, Zsolt/0000-0001-6410-8801} } @article{MTMT:33112641, title = {Középiskolai tehetséggondozás a BME Vegyészmérnöki és Biomérnöki Karán}, url = {https://m2.mtmt.hu/api/publication/33112641}, journal-iso = {MAGY KEM LAP}, journal = {MAGYAR KÉMIKUSOK LAPJA}, volume = {77}, unique-id = {33112641}, issn = {0025-0163}, year = {2022}, eissn = {1588-1199}, pages = {177-178}, orcid-numbers = {Kózelné Székely, Edit/0000-0002-6935-0071} } @article{MTMT:33112640, title = {A BME-n kémiát oktatók véleménye az elsőévesek kémiatudásáról és kémiai iránti elkötelezettségéről – avagy mi segítené a mi munkánkat?}, url = {https://m2.mtmt.hu/api/publication/33112640}, journal-iso = {MAGY KEM LAP}, journal = {MAGYAR KÉMIKUSOK LAPJA}, volume = {77}, unique-id = {33112640}, issn = {0025-0163}, year = {2022}, eissn = {1588-1199}, pages = {174-176}, orcid-numbers = {Kózelné Székely, Edit/0000-0002-6935-0071} } @article{MTMT:32799387, title = {Application of the Integrated Supercritical Fluid Extraction–Impregnation Process (SFE-SSI) for Development of Materials with Antiviral Properties}, url = {https://m2.mtmt.hu/api/publication/32799387}, author = {Lukic, I. and Pajnik, J. and Nisavic, J. and Tadic, V. and Vági, Erika and Kózelné Székely, Edit and Zizovic, I.}, doi = {10.3390/pr10040680}, journal-iso = {PROCESSES}, journal = {PROCESSES}, volume = {10}, unique-id = {32799387}, issn = {2227-9717}, year = {2022}, eissn = {2227-9717}, orcid-numbers = {Kózelné Székely, Edit/0000-0002-6935-0071} } @{MTMT:33674819, title = {3-Klórmandulasav olvadási hőmérsékletének vizsgálata szuperkritikus szén-dioxid és szerves oldószerek nagynyomású elegyében}, url = {https://m2.mtmt.hu/api/publication/33674819}, author = {Arany, Dóra and Kőrösi, Márton and Mihalovits, Máté and Béri, János and Kózelné Székely, Edit}, booktitle = {XXIV. Tavaszi Szél Konferencia 2021: Absztrakt kötet}, unique-id = {33674819}, year = {2021}, pages = {279-280}, orcid-numbers = {Kózelné Székely, Edit/0000-0002-6935-0071} }