Liquid-liquid equilibrium and physical properties of aqueous mixtures of poly(vinyl pyrrolidone) with potassium phosphate at different pH: Experiments and modeling

Liquid-liquid equilibrium data for poly vinyl pyrrolidone (PVP) K30+K 2 HPO 4 +H 2 O system were measured at 298.15 K and different pH values (7.54, 8.05, and 9.47). A binodal curve was fitted to the Merchuk equation and the tie line compositions were fitted to both the Othmer-Tobias and Bancroft eq...

Full description

Saved in:
Bibliographic Details
Published in:The Korean journal of chemical engineering 2017, 34(4), 205, pp.1149-1158
Main Authors: Rahmani, Abbas, Rostami, Abbas Ali, Pirdashti, Mohsen, Mobalegholeslam, Poorya
Format: Article
Language:English
Subjects:
Binary systems
Biotechnology
Catalysis
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Interaction parameters
Liquid-liquid equilibrium
Materials Science
Nonlinear equations
Parameter modification
Phase equilibria
Physical properties
Potassium
Potassium phosphates
Refractivity
Separation Technology
Thermodynamics
화학공학
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Liquid-liquid equilibrium data for poly vinyl pyrrolidone (PVP) K30+K 2 HPO 4 +H 2 O system were measured at 298.15 K and different pH values (7.54, 8.05, and 9.47). A binodal curve was fitted to the Merchuk equation and the tie line compositions were fitted to both the Othmer-Tobias and Bancroft equations. The refractive indices and densities of several homogeneous binary and ternary solutions used for calibration were also measured within a range of 0–30 mass% of PVP and 0–50 mass% of K 2 HPO 4 . Then, the viscosities, densities, electrical conductivities, and refractive indices of binary (PVP K30+water; potassium phosphate+water) and ternary (PVP K30+potassium phosphate+water) systems were measured and correlated at different pH values. The density data showed a linear variation of the polymer and salt mass fractions. The viscosity data of PVP K30 solutions were correlated as a function of the mass fractions by using a nonlinear equation. The effects of the tie line lengths on the densities and viscosities of the aqueous two-phase systems were represented. Also, the modified UNIFAC-NRF is used to calculate the phase equilibria of the mention system. The fitted binary interaction parameters of the model were reported.
ISSN:0256-1115
1975-7220
DOI:10.1007/s11814-016-0326-9