Mathematical simulation of the solubility of substances in the process of extraction with the use as the solvent of a dioxide of carbon in the supercritical fluid state

2015 ◽  
Vol 3 (9) ◽  
pp. 313-316
Author(s):  
A. Kraynov ◽  
T. Stepanova
Keyword(s):  
Mathematical Simulation ◽  
Supercritical Fluid ◽  
Fluid State ◽  
Supercritical Fluid State

Observation of Pinning Strengthening in “MgB2 – CNT – α-Fe” Nanocomposites Studied by Microwave Absorption Technique

2015 ◽  
Vol 233-234 ◽  
pp. 750-753
Author(s):  
Valerii V. Bazarov ◽  
Pavel N. Togulev ◽  
Farkhad A. Nizamov ◽  
Nikolay M. Lyadov ◽  
Svetlana N. Ivicheva ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Supercritical Fluid ◽  
Iron Nanoparticles ◽  
Pinning Force ◽  
Fluid State ◽  
Absorption Technique ◽  
Supercritical Fluid State

Microwave absorption histeresis is measured in superconducting composites, prepared from MgB2 , carbon nanotubes, graphene particles and iron nanoparticles. Iron nanoparticles were synthesized with using of isopropanol in the supercritical fluid state. Measurements showed that the greatest increase in the pinning force is observed in the “MgB2 – (CNT-α-Fe)” composite.

Some thermodynamic processes of anthracite–carbon dioxide mixture in supercritical fluid state

2016 ◽  
Vol 10 (8) ◽  
pp. 1180-1190 ◽  
Author(s):  
Ameer Abed Jaddoa ◽  
A. A. Zakharov ◽  
T. R. Bilalov ◽  
R. R. Nakipov ◽  
I. R. Gabitov ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Fluid ◽  
Fluid State ◽  
Thermodynamic Processes ◽  
Supercritical Fluid State

Dynamics of pulsed laser ablation in high-density carbon dioxide including supercritical fluid state

2013 ◽  
Vol 114 (14) ◽  
pp. 143303 ◽  
Author(s):  
Keiichiro Urabe ◽  
Toru Kato ◽  
Sven Stauss ◽  
Shohei Himeno ◽  
Satoshi Kato ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Laser Ablation ◽  
Supercritical Fluid ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
High Density ◽  
Fluid State ◽  
Supercritical Fluid State

scholarly journals Developments in CO2 research

2001 ◽  
Vol 73 (8) ◽  
pp. 1281-1285 ◽  
Author(s):  
Jacqueline A. Behles ◽  
Joseph M. DeSimone
Keyword(s):  
Critical Temperature ◽  
Small Molecules ◽  
Supercritical Fluid ◽  
Small Molecule ◽  
Critical Pressure ◽  
Operating Conditions ◽  
Polymeric Surfactants ◽  
Fluid State ◽  
Compressed Liquid ◽  
Supercritical Fluid State

CO2 can be a good solvent for many compounds when used in its compressed liquid or supercritical fluid state. Above its critical temperature and critical pressure (Tc = 31 C, Pc = 73.8 bar), CO2 has liquid-like densities and gas-like viscosities, which allows for safe commercial and laboratory operating conditions. Many small molecules are readily soluble in CO2, whereas most macromolecules are not. This has prompted development of several classes of small molecule and polymeric surfactants that enable emulsion and dispersion polymerizations as well as other technological processes.

scholarly journals The role of water in volcanism

2019 ◽  
pp. 69-80 ◽  
Author(s):  
G. I. Arsanova
Keyword(s):  
Supercritical Fluid ◽  
Gas Transport ◽  
Environmental Parameters ◽  
Silicate Melt ◽  
Fluid State ◽  
State Of Water ◽  
Fluid Properties ◽  
The Relationship ◽  
Supercritical Fluid State

Water plays an extremely important role in volcanism: it acts as an evacuator of viscous melts in a variety of ways, which is ensured by the presence of relevant properties of its phase states, which successively changing with the fall of the environmental parameters. In this sense, the supercritical (fluid) state of water is especially significant. The paper provides a summary of fluid properties that are unique in many ways. The properties determine the relationship between water fluid and silicate melt, which in turn explains the cause of volcanic phenomena and the course of eruptions: explosions of different power, the emergence of the so-called fluidized mass, scorching clouds, landslides and breakthroughs on the slopes, the formation of ignimbrites, as well as the mechanism of gas transport to the foot of volcanoes. Both by role and quantity, water is the main volcanic substance, which together with the silicate melt constitutes magma.

Supercritical fluid state of hydrocarbon-water fluids in a porous medium and optimization of fluid release from pores

2011 ◽  
Vol 5 (8) ◽  
pp. 1240-1244
Author(s):  
E. N. Alexandrov ◽  
N. M. Kuznetsov ◽  
G. P. Brusova ◽  
A. V. Shlyakhtin ◽  
A. L. Petrov ◽  
...  
Keyword(s):  
Porous Medium ◽  
Supercritical Fluid ◽  
Fluid State ◽  
Fluid Release ◽  
Supercritical Fluid State

Devulcanization of Sulfur-Cured Isoprene Rubber in Supercritical Carbon Dioxide

2003 ◽  
Vol 76 (4) ◽  
pp. 957-968 ◽  
Author(s):  
M. Kojima ◽  
K. Ogawa ◽  
H. Mizoshima ◽  
M. Tosaka ◽  
S. Kohjiya ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Molecular Weight ◽  
Supercritical Co2 ◽  
Crosslink Density ◽  
Soxhlet Extraction ◽  
Gaseous State ◽  
Fluid State ◽  
Cure Time ◽  
Supercritical Fluid State ◽  
Isoprene Rubber

Abstract A new devulcanization process that utilizes supercritical CO2 (scCO2) along with devulcanizing reagents was studied. Unfilled polyisoprene rubber samples (vulcanizates) with different crosslink distributions were prepared by controlling the cure time and the curatives. Each of the vulcanizates was subjected to the Soxhlet extraction using azeotropic acetone/chloroform to remove residual curatives. The devulcanization was performed at various temperatures (140–200 °C) in the presence of scCO2 for 60 min. The product was fractionated into sol and gel components, and molecular weight of the sol component and the crosslink density of the gel component were determined. Thiol-amine reagent was found to be effective among several devulcanizing reagents; the molecular weight of the resulted sol component was about tens of thousands and the crosslink density of gel component decreased substantially from the initial ones. Yield of the sol component increased with the increase in the CO2 pressure. In the supercritical fluid state of CO2, the vulcanizate was more efficiently devulcanized than in an ordinary gaseous state of CO2. The sol fraction depended considerably on the crosslink distribution in the vulcanizate. These results suggest that the devulcanizing reagents penetrate and diffuse into the vulcanizate in the presence of scCO2.

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