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Naslov:Estimation of solid solubilities in supercritical carbon dioxide: Peng-Robinson adjustable binary parameters in the near critical region
Avtorji:Škerget, Mojca (Avtor)
Novak-Pintarič, Zorka (Avtor)
Knez, Željko (Avtor)
Kravanja, Zdravko (Avtor)
Datoteke:URL http://dx.doi.org/10.1016/S0378-3812(02)00177-2
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Opis:The density dependence of the binary parameters of the Peng-Robinson equation of state in near the critical region was examined. Published solubility data of eight compounds in pure CO2 have been fitted to the Peng-Robinson equation in combination with one and two parameters van der Waals mixing rules and in combination with the three parameter density dependent mixing rule of Mohamed and Holder. A systematic study has been done to determine the influence of different terms in the mixing rules. In order to obtain density dependence, binary parameters were calculated for each isotherm at particular experimental point separately in the way to equalise experimental and calculated solubility data. The system was formulated as an equation-oriented model and solved by means of a nonlinear programming optimisation algorithm. For all compounds the binary interaction parameters thus obtained were found to vary strongly with pressure in the range from 75 bar to approximately 150 bar, i.e. near the critical end point (CEP) of the low temperature branch of the three phase solid-liquid-gas (SLG) curve. At higher pressures, the parameter is practically independent on pressure. In general, for the systems investigated, kij increases linearly with increasing density and reaches a constant value at higher densities in the range from 700 to 800 kg/m3, depending on the system under investigation.
Ključne besede:solid liquid equilibria, equation of state, mixing rules, binary parameters, near critical region, nonlinear programming, thermodynamic model, supercritical fluids, CO2, solubility
Leto izida:2002
UDK:66-987:541.8
COBISS_ID:7503894 Novo okno
ISSN pri članku:0378-3812
NUK URN:URN:SI:UM:DK:9X8QZVMR
Število ogledov:1605
Število prenosov:99
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
Področja:Ostalo
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Gradivo je del revije

Naslov:Fluid phase equilibria
Skrajšan naslov:Fluid phase equilib.
Založnik:Elsevier
ISSN:0378-3812
COBISS.SI-ID:6362119 Novo okno

Sekundarni jezik

Jezik:Angleški jezik
Ključne besede:ravnotežje trdno tekoče, enačba stanja, mešanje, binarni parametri, kritično območje, nelinearno programiranje, termodinamični model, superkritični fluidi, CO2, topnost


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