6533b7d7fe1ef96bd1268d8d
RESEARCH PRODUCT
Phase behavior of the system hyperbranched polyglycerol+methanol+carbon dioxide
Daniel WilmsChristian S. SchachtSara BahramaliTheo W. De LoosJoachim GrossJoachim GrossHolger Freysubject
chemistry.chemical_classificationCloud pointEquation of stateTernary numeral systemMolar massGeneral Chemical EngineeringGeneral Physics and AstronomyThermodynamicsPolymerBranching (polymer chemistry)Physics::Fluid DynamicsCondensed Matter::Soft Condensed MatterchemistryOrganic chemistryBubble pointPhysical and Theoretical ChemistryPhase diagramdescription
Abstract Phase equilibrium data have been measured for the ternary system hyperbranched polyglycerol + methanol + carbon dioxide at temperatures of 313–450 K and pressures up to 13.5 MPa. Phase changes were determined according to a synthetic method using the Cailletet setup. At elevated temperatures the system shows a liquid–liquid–vapor region with lower solution temperatures. Besides the vapor–liquid and liquid–liquid equilibria, the vapor–liquid to vapor–liquid–liquid and vapor–liquid–liquid to liquid–liquid phase boundaries are reported at different polymer molar masses and can serve as test sets for thermodynamic models. A distinct influence of the polymer molar mass on the vapor–liquid equilibrium can be noticed and indicates the existence of structural effects due to the polymer branching. Modeling the systems with the PCP-SAFT equation of state confirms these findings.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-12-01 | Fluid Phase Equilibria |