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Mathematical modelling of phase equilibria for supercritical CO2 and polyethylene glycol of various molecular weightsMarkočič, Elena ; Knez, ŽeljkoThe Sanchez-Lacombe equation of state and the Statistical Associating Fluid Theory were applied for modelling the phase equilibrium for the polyethylene glycol-CO2 systems. The Aspen Plus software ... was used and polyethylene glycol with various molecular weights was investigated. The results were compared with previously obtained experimental values for solubility. The phase equilibrium was calculated at a temperature of 343 K, in the pressure range of 10-30 MPa and for polyethylene glycol molecular weights from 1000 to 100,000 g/mol. The binary interaction parameters for the models were optimized in order to obtain the best fit between the estimated and the experimental gas solubility data. The results suggest that both models are reliable in describing the phase equilibrium of the polyethylene glycol-CO2 systems at the proposed conditions. Moreover, the molecular weight of the polymer affects the behaviour of the system, as observed from the variation of solubility values and of binary interaction coefficients.Source: The Journal of supercritical fluids. - ISSN 0896-8446 (Vol. 95, Nov. 2014, str. 635-640)Type of material - article, component partPublish date - 2014Language - englishCOBISS.SI-ID - 18495766
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Markočič, Elena | 30607 |
Knez, Željko | 02619 |
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