Phase equilibria in supercritical propane systems for separation of continuous oil mixtures

Phase behaviour of heavy petroleum fractions in pure propane and n-butane and with methanol as co-solvent

“…Measurements were accomplished over the temperature range from 323 K to 393 K and the results are presented in table 7. Figure 5a and b shows the pressure-composition diagram for this system at all temperatures investigated in this work and, as one should expect, the three-phase region exhibits an almost linear composition-independent behaviour at all temperatures.…”

“…Radosz et al [7] reported experimental data and thermodynamic modelling of systems containing propane and mixtures of petroleum derivatives which have molar mass ranging from (300 to 350) g Á mol À1 . In that study, two systems constituted respectively by saturated hydrocarbons and aromatics compounds were investigated at temperatures close to 400 K and pressures up to 5.5 MPa.…”

Phase equilibria calculations for ill‐defined mixtures using the prsv equation of state

“…The system chosen is the supercritical propane-continuous oil mixture of Radosz et al (1987). The system chosen is the supercritical propane-continuous oil mixture of Radosz et al (1987).…”

“…The system chosen is the supercritical propane-continuous oil mixture of Radosz et al (1987). Qualitatively the curve is similar to the composite beta function curve of Radosz et al (1987). Flash calculations were performed over the ranges 374-414 K and 3102-5514 @a.…”

"Utilização de fluidos no estado sub/supercritico na polpação de Eucalyptus grandis e Pinus taeda"

“…A lavagem da polpa é um deles. Enquanto nos processos convencionais a polpa é lavada com água, no processo organossolve, o uso direto da lavagem com água é inviável, uma vez que pode ocorrer precipitação da lignina dissolvida sobre as fibras (Aziz e Sarkanen, 1989 Um fluido supercrítico pode ser definido como um gás "muito denso" ou a forma da substância na qual os estados líquido e gasoso são indistinguíveis (Radosz, 1987).…”