20.500.12556/DKUM-64254 RAZVOJ METODE ZA DOLOČEVANJE VISKOZNOSTI SUBSTANC V SISTEMIH S SUPERKRITIČNIMI FLUIDI DEVELOPMENT OF A METHOD FOR THE DETERMINATION OF VISCOSITY OF DIFFERENT SUBSTANCES IN THE SYSTEMS WITH SUPERCRITICAL FLUIDS Uporaba superkritičnih fluidov vse bolj narašča. V literaturi najdemo veliko podatkov o obnašanju sistema pri določenih pogojih. Zelo malo pa je podatkov za dvofazne sisteme, ki so zelo pomembni za načrtovanje novih industrijskih postopkov. Tako smo v diplomskem delu preizkusili do sedaj neuporabljeno metodo določanja viskoznosti sistema polietilen glikol/CO2 pri različnih tlakih in z različnimi molskimi masami polietilen glikola ter ugotovili, kako oba dejavnika vplivata na viskoznost sistema. Omenjen sistem PEG/CO2 smo preučevali v tlačnem območju od 10 MPa do 35 MPa, pri konstantni temperaturi 333 K. Ugotovili smo, da se gostota sistema PEG/CO2 obnaša kot funkcija tlaka. Vpliv molske mase je precej manjši. Iz diagramov viskoznost/tlak za različne molske mase polietilen glikola je razvidno, da je zmanjšanje viskoznosti bolj izrazito pri nižjih tlakih. Applications supercritical fluids are growing rapidly. In the literature a lot of information about the behavior of the system under certain conditions can be found. On the other hand, there is lack of data for two-phase systems, which are very important for design of new industrial processes. A new method for determining viscosity of system multi-compound systems at elevated pressures has been developed. Viscosity of different molar weight polyethylene glycols has been evaluated after addition of CO2. System of PEG/CO2 was studied in the pressure range of 10 MPa to 35 MPa at a constant temperature of 333 K. The method requires previos knowledge of system density. Density of the system PEG/CO2 behaves as a function of pressure. Influence of the molar weight is much smaller. Diagrams presenting viscosity as a fanction of pressure clearly demonstrate that reduction in viscosity is more pronounced at lower pressures. superkritični fluid ogljikov dioksid polietilen glikol viskoznost supercritical fluid carbon dioxide polyethylene glycol a viscosity true true false [M. Horvat] Slovenski jezik Angleški jezik Diplomsko delo 2016-09-25 11:17:17 2016-10-25 11:22:28 2022-07-05 03:06:41 2019-07-11 13:55:34 2016 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 533.6.011.12:54-139(043.2) 20335126 URN:SI:UM:DK:2SUXACLB UN_Horvat_Marjan_2016.pdf UN_Horvat_Marjan_2016.pdf 1 08BEE103587BF516B27B7D6BF1F19F31 5259bf87a2c87d9654f98f390099f1ae3f0a78448e9eea2b1f0085ea0b1364d4 cfd28a1c-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=107799 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0