diplomsko delo univerzitetnega študijskega programa
Marjan Horvat (Author), Željko Knez (Mentor), Maša Knez Hrnčič (Co-mentor)

Abstract

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.

Keywords

viskoznost;superkritični fluidi;Reynoldsovo število;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher: [M. Horvat]
UDC: 533.6.011.12:54-139(043.2)
COBISS: 20335126 Link will open in a new window
Views: 1606
Downloads: 81
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Other data

Secondary language: English
Secondary title: DEVELOPMENT OF A METHOD FOR THE DETERMINATION OF VISCOSITY OF DIFFERENT SUBSTANCES IN THE SYSTEMS WITH SUPERCRITICAL FLUIDS
Secondary abstract: 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.
Secondary keywords: viscosity;supercritical fluids;Reylons number;PEG;
URN: URN:SI:UM:
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages: XI, 37 str.
ID: 9174432