TWO PHASE EQUILIBRIA OF METAL IONS IN PULPING UNIT OPERATIONS: FROM IMPREGNATION TO OXYGEN BLEACHING

2000 ◽  
pp. 95-102
Author(s):  
J. Karhu ◽  
P. Snickars ◽  
L. Harju ◽  
A. Ivaska
Keyword(s):  
Phase Equilibria ◽  
Metal Ions ◽  
Two Phase ◽  
Unit Operations ◽  
Oxygen Bleaching

scholarly journals Thermodynamics and Machine Learning Based Approaches for Vapor–Liquid–Liquid Phase Equilibria in n-Octane/Water, as a Naphtha–Water Surrogate in Water Blends

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 413
Author(s):  
Sandra Lopez-Zamora ◽  
Jeonghoon Kong ◽  
Salvador Escobedo ◽  
Hugo de Lasa
Keyword(s):  
Machine Learning ◽  
Liquid Phase ◽  
Phase Equilibria ◽  
Aspen Plus ◽  
Phase Region ◽  
Two Phase ◽  
Technical Literature ◽  
Phase Liquid ◽  
Liquid Vapor ◽  
Vapor Liquid

The prediction of phase equilibria for hydrocarbon/water blends in separators, is a subject of considerable importance for chemical processes. Despite its relevance, there are still pending questions. Among them, is the prediction of the correct number of phases. While a stability analysis using the Gibbs Free Energy of mixing and the NRTL model, provide a good understanding with calculation issues, when using HYSYS V9 and Aspen Plus V9 software, this shows that significant phase equilibrium uncertainties still exist. To clarify these matters, n-octane and water blends, are good surrogates of naphtha/water mixtures. Runs were developed in a CREC vapor–liquid (VL_ Cell operated with octane–water mixtures under dynamic conditions and used to establish the two-phase (liquid–vapor) and three phase (liquid–liquid–vapor) domains. Results obtained demonstrate that the two phase region (full solubility in the liquid phase) of n-octane in water at 100 °C is in the 10-4 mol fraction range, and it is larger than the 10-5 mol fraction predicted by Aspen Plus and the 10-7 mol fraction reported in the technical literature. Furthermore, and to provide an effective and accurate method for predicting the number of phases, a machine learning (ML) technique was implemented and successfully demonstrated, in the present study.

scholarly journals The Effect of Salts on the Liquid–Liquid Phase Equilibria of PEG600 + Salt Aqueous Two-Phase Systems

2013 ◽  
Vol 58 (12) ◽  
pp. 3528-3535 ◽  
Author(s):  
Sara C. Silvério ◽  
Oscar Rodríguez ◽  
José A. Teixeira ◽  
Eugénia A. Macedo
Keyword(s):  
Liquid Phase ◽  
Phase Equilibria ◽  
Two Phase ◽  
Aqueous Two Phase Systems ◽  
Phase Systems

Phase Equilibria of Three Aqueous Two-Phase Systems

1992 ◽  
pp. 1833-1838
Author(s):  
MASAHIRO KATO ◽  
MASATO YAMAGUCHI ◽  
TOSHIHIRO KIUCHI ◽  
SHOICHI ITO ◽  
MICHIMASA NAKAMURA
Keyword(s):  
Phase Equilibria ◽  
Two Phase ◽  
Aqueous Two Phase Systems ◽  
Phase Systems

Phase Equilibria in Hydrocarbon Systems. n-Butane-Water System in the Two-Phase Region.

1952 ◽  
Vol 44 (3) ◽  
pp. 609-615 ◽  
Author(s):  
H. H. Reamer ◽  
B. H. Sage ◽  
W. N. Lacey
Keyword(s):  
Phase Equilibria ◽  
Water System ◽  
Phase Region ◽  
Two Phase

Critical lines and phase equilibria in binary van der Waals mixtures

1980 ◽  
Vol 298 (1442) ◽  
pp. 495-540 ◽  
Keyword(s):  
Phase Equilibria ◽  
Binary Mixtures ◽  
Critical Points ◽  
Van Der Waals ◽  
Coexistence Curve ◽  
Phase Behaviour ◽  
Maximum Temperature ◽  
Phase System ◽  
Two Phase ◽  
Critical Solution Temperatures

The study of phase equilibria is historically one of the most important sources of information about the nature of intermolecular forces in non-electrolyte liquids and their mixtures. Many of the main features of vapour-liquid and liquid-liquid phase behaviour were already well characterized experimentally during the early part of this century, but the theoretical explanation of phase equilibria for a wide variety of substances and over a large range of pressures and temperatures has lagged far behind. This paper presents theoretical studies of phase equilibria in binary mixtures obeying the van der Waals equation, especially liquid-liquid equilibria that can occur at high pressures. The variety of fluid phase behaviour that occurs in binary mixtures can be qualitatively discussed in terms of the changes in thermodynamic properties near critical points. Upper critical solution temperatures (UCSTs) occur when a heterogeneous (two-phase) system becomes a homogeneous (one-phase) system when the temperature is raised. The maximum temperature along the temperature-mole fraction ( T, x ) coexistence curve for constant pressure is the UCST at this pressure. Lower critical solution temperatures (LCSTs) occur when a homogeneous system becomes a two-phase system when the temperature is increased. The LCST is at the minimum of the T, x coexistence curve. Thermodynamic considerations of critical points yield requirements for the curvature of the mixing functions plotted against x .

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