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An Improved Apparatus for Vapour-Liquid Equilibria Measurement in Polymer + Solvent Systems at Higher Temperatures: a Study of the Water + Poly(ethylene glycol) System.
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SYSNO ASEP 0479630 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title An Improved Apparatus for Vapour-Liquid Equilibria Measurement in Polymer + Solvent Systems at Higher Temperatures: a Study of the Water + Poly(ethylene glycol) System. Author(s) Pavlíček, Jan (UCHP-M) RID, SAI
Bogdanić, Grozdana (UCHP-M) RID, ORCID, SAI
Wichterle, Ivan (UCHP-M) RID, ORCID, SAISource Title Fluid Phase Equilibria. - : Elsevier - ISSN 0378-3812
Roč. 454, 25 DEC (2017), s. 111-115Number of pages 5 s. Language eng - English Country NL - Netherlands Keywords correlation ; experimental data ; polymer-solvent system Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA15-19542S GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000414879000011 EID SCOPUS 85030125753 DOI 10.1016/j.fluid.2017.09.013 Annotation Recently we designed an apparatus for total pressure measurement in binary polymer + solvent systems. Accurate as it is, the apparatus is limited by its direct capacitance pressure sensor that can operate only at 318.15 K. In this study we tested a new setup that overcomes this limitation with a pressure transducer (MKS Baratron), which can be heated up to 430 K. The main improvement is that the new setup has eliminated solvent vapour condensation in the pressure measurement unit. Other parts of the equipment can easily be kept at temperatures higher than the system temperature with heating tapes. Unlike the ebulliometric method, which is limited by problems arising from the boiling of viscous mixtures, now we can study solutions with higher polymer concentrations. We tested the new setup by measuring the total pressure of binary poly(ethylene glycol) + water mixtures at six isotherms in the (308.15–343.15) K range. Additionally we determined new data for three isotherms (343.15, 353.15, and 363.15) K using ebulliometric method. We then correlated our measurements with both methods using the UNIQUAC–free volume model and compared them with available published data for isotherms 313.15 K and 333.15 K. The agreement with our static measurement results was excellent. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2018
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