20.500.12556/DKUM-37744 DOLOČITEV GOSTOTE SISTEMOV POLIMER/CO2 DENSITY DETERMINATION IN THE SYSTEM POLYMER/CO2 Gostota je ena izmed najpomembnejših termodinamskih lastnosti, ki jih potrebujemo za načrtovanje procesov oz. procesnih naprav. Gostote enofaznih sistemov so večinoma dobro raziskane in podatki so dostopni v številni literaturi (tudi za enofazne sisteme pri visokih tlakih). Podatki o gostotah dvofaznih sistemov (oziroma večfaznih sistemov) so nekoliko bolj redki, posebno pri povišanih tlakih. Gostoto takega sistema smo izmerili v okviru diplomskega dela in sicer smo delali s sistemom polietilen glikol (PEG)/CO2 pri povišanih tlakih (do 450 bar). PEG je polimerna snov z različnim povprečjem molskih mas. Pri našem delu smo uporabili PEG molskih mas 1500 g/mol, 3000 g/mol ter 6000 g/mol, ki so vsi v trdnem agregatnem stanju. Pri naših obratovalnih pogojih (tlak med 80 bar in 450 bar, temperatura med 50°C in 65°C) je CO2 v stanju superkritičnega fluida. To pomeni, da ima tako lastnosti plina kot tekočine. Superkritični CO2 je eden najpogosteje uporabljenih SCF zaradi svoje inertnosti in relativno nizke kritične temperature ter kritičnega tlaka se zelo pogosto uporablja za različne ekstrakcije. Density is one of the most important thermodynamic properties, which is needed for chemical process design. Densities of one phase systems are mostly well researched and the data is accessible in the literature (also for one phase systems at high pressure). Data on the densities of two phase systems (or multiphase systems) is not so accessible, especially for systems at high pressures. In this work the density of the PEG/CO2 system at high pressures (up to 450 bar) was determined. PEG is a polymer with a variety of molar masses. PEG of molar masses 1500 g/mol, 3000 g/mol and 6000 g/mol, which are all in a solid state, were applied in this work. At our operating conditions (pressure between 80 bar and 450 bar, temperature between 50oC and 65oC) CO2 is in a supercritical fluid state, which means it has gas and liquid characteristics. Supercritical CO2 is one of the most commonly used SCF, because of its inertness and relatively low critical temperature and critical pressure. CO2 is often used as a solvent in extraction processes. fazna ravnotežja superkritični fluid binarne mešanice polimer phase equilibrium supercritical fluid binary mixture polymer true true false [G. Mlakar] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2012-09-09 20:56:09 2012-09-11 09:32:06 2022-04-24 22:05:04 2021-04-18 03:36:24 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.061-987(043.2) 16712214 URN:SI:UM:DK:NA1ZA74U UNI_Mlakar_Gregor_2012.pdf UNI_Mlakar_Gregor_2012.pdf 1 7728AA1657C827CF9CDB13C813EBFFAF efe0669145c8cbe2569111a190c8d632cf9fbc79c97cf16dd7a4caa9953e9f27 526ac42f-7c08-11eb-bb7a-00155d0001ca 20.500.12556/dkum/eeedb2df-a6ce-4ae2-8e85-d76fecaadbf0 https://dk.um.si/Dokument.php?lang=slv&id=49920 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0