scholarly journals Widom line and dynamical crossovers as routes to understand supercritical water

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
P. Gallo ◽  
D. Corradini ◽  
M. Rovere
Keyword(s):  
Supercritical Water ◽  
Widom Line

scholarly journals Visualization of supercritical water pseudo-boiling at Widom line crossover

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Florentina Maxim ◽  
Cristian Contescu ◽  
Pierre Boillat ◽  
Bojan Niceno ◽  
Konstantinos Karalis ◽  
...  
Keyword(s):  
Supercritical Water ◽  
New Technologies ◽  
Waste Treatment ◽  
Imaging Techniques ◽  
Current Theory ◽  
Density Fluctuations ◽  
Neutron Imaging ◽  
Materials Synthesis ◽  
Natural Systems ◽  
Widom Line

Abstract Supercritical water is a green solvent used in many technological applications including materials synthesis, nuclear engineering, bioenergy, or waste treatment and it occurs in nature. Despite its relevance in natural systems and technical applications, the supercritical state of water is still not well understood. Recent theories predict that liquid-like (LL) and gas-like (GL) supercritical water are metastable phases, and that the so-called Widom line zone is marking the crossover between LL and GL behavior of water. With neutron imaging techniques, we succeed to monitor density fluctuations of supercritical water while the system evolves rapidly from LL to GL as the Widom line is crossed during isobaric heating. Our observations show that the Widom line of water can be identified experimentally and they are in agreement with the current theory of supercritical fluid pseudo-boiling. This fundamental understanding allows optimizing and developing new technologies using supercritical water as a solvent.

scholarly journals Supercritical water anomalies in the vicinity of the Widom line

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Konstantinos Karalis ◽  
Christian Ludwig ◽  
Bojan Niceno
Keyword(s):  
Supercritical Water ◽  
Industrial Applications ◽  
Density Fluctuations ◽  
Anomalous Behaviour ◽  
Detailed Knowledge ◽  
Interatomic Potentials ◽  
Homogeneous Fluid ◽  
Widom Line ◽  
Scale Inhomogeneity ◽  
Dynamics Simulations

Abstract Supercritical water is used in a variety of chemical and industrial applications. As a consequence, a detailed knowledge of the structure-properties correlations is of uttermost importance. Although supercritical water was considered as a homogeneous fluid, recent studies revealed an anomalous behaviour due to nanoscale density fluctuations (inhomogeneity). The inhomogeneity is clearly demarked through the Widom line (maxima in response factions) and drastically affect the properties. In the current study the physical properties of supercritical water have been determined by classical molecular dynamics simulations using a variety of polarized and polarizable interatomic potentials. Their validity which was not available at supercritical conditions has been assessed based on the ability to reproduce experimental data. Overall, the polarized TIP4P/2005 model accurately predicted the properties of water in both liquid-like and gas-like regions. All interatomic potentials captured the anomalous behaviour providing a direct evidence of molecular-scale inhomogeneity.

PENGGUNAAN AIR SUPER KRITIS PADA DEPOLIMERISASI NYLON-12 (BATCH PROCESS)

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Mohamad Yusman
Keyword(s):  
Supercritical Water ◽  
Scale Up ◽  
Experimental Studies ◽  
Reaction System ◽  
Batch Process ◽  
Chemical Recycling ◽  
Water Decomposition ◽  
Product Distributions ◽  
New Process ◽  
Nylon 12

Water at the supercritical state is a new process for the chemical recycling. At this thermodynamic state i.e. Pc = 218 atmospheres and Tc = 374oC , water behaves very differently from its everyday temperament and it is a very good solvent for organic components. Experimental studies show that supercritical water can decompose hydrocarbons/polymers and produce useful products like 2-Azacyclotridecanone /lactam-1 from Nylon-12 (batch process). The decomposition process itself was carried out in batch reaction system in order to get more information about product distributions, time dependence, and scale-up possibilities.Keywords: supercritical water, decomposition, batch, polymer, hydrocarbon

Kinetics of Supercritical Water Oxidation. SERDP Compliance Technical Thrust Area

1996 ◽  
Author(s):  
Steven F. Rice ◽  
Richard R. Steeper ◽  
Russell G. Hanush ◽  
Jason D. Aiken ◽  
Eric Croiset
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Kinetics Of

Kinetics of Supercritical Water Oxidation

1995 ◽  
Author(s):  
Steven F. Rice ◽  
Jefferson W. Tester ◽  
Kenneth Brezinsky
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Kinetics Of

Kinetics of Supercritical Water Oxidation

1995 ◽  
Author(s):  
Steven F. Rice ◽  
Jefferson W. Tester ◽  
Kenneth Brezinsky
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Kinetics Of

Recent Developments of Supercritical Water Oxidation: A Patents Review

2011 ◽  
Vol 4 (3) ◽  
pp. 219-230 ◽  
Author(s):  
Angel Martin ◽  
Maria Dolores Bermejo ◽  
Maria Jose Cocero
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Recent Developments
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