An investigation of process parameters on colour during the dyeing of polyester in supercritical carbon dioxide media

2021 ◽  
Author(s):  
İdil Yiğit ◽  
Semiha Eren ◽  
Hande Özcan ◽  
Ozan Avinc ◽  
Hüseyin Aksel Eren
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Process Parameters ◽  
Supercritical Carbon Dioxide Media ◽  
Supercritical Carbon

scholarly journals Controlling Foam Morphology of Poly(methyl methacrylate) via Surface Chemistry and Concentration of Silica Nanoparticles and Supercritical Carbon Dioxide Process Parameters

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Deniz Rende ◽  
Linda S. Schadler ◽  
Rahmi Ozisik
Keyword(s):  
Carbon Dioxide ◽  
Surface Modification ◽  
Supercritical Carbon Dioxide ◽  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Process Parameters ◽  
Process Conditions ◽  
Average Cell ◽  
Foam Morphology ◽  
Supercritical Carbon

Polymer nanocomposite foams have received considerable attention because of their potential use in advanced applications such as bone scaffolds, food packaging, and transportation materials due to their low density and enhanced mechanical, thermal, and electrical properties compared to traditional polymer foams. In this study, silica nanofillers were used as nucleating agents and supercritical carbon dioxide as the foaming agent. The use of nanofillers provides an interface upon which CO2nucleates and leads to remarkably low average cell sizes while improving cell density (number of cells per unit volume). In this study, the effect of concentration, the extent of surface modification of silica nanofillers with CO2-philic chemical groups, and supercritical carbon dioxide process conditions on the foam morphology of poly(methyl methacrylate), PMMA, were systematically investigated to shed light on the relative importance of material and process parameters. The silica nanoparticles were chemically modified with tridecafluoro-1,1,2,2-tetrahydrooctyl triethoxysilane leading to three different surface chemistries. The silica concentration was varied from 0.85 to 3.2% (by weight). The supercritical CO2foaming was performed at four different temperatures (40, 65, 75, and 85°C) and between 8.97 and 17.93 MPa. By altering the surface chemistry of the silica nanofiller and manipulating the process conditions, the average cell diameter was decreased from9.62±5.22to1.06±0.32 μm, whereas, the cell density was increased from7.5±0.5×108to4.8±0.3×1011cells/cm3. Our findings indicate that surface modification of silica nanoparticles with CO2-philic surfactants has the strongest effect on foam morphology.

Control of calcium carbonate morphology by precipitation in compressed and supercritical carbon dioxide media

2004 ◽  
Vol 271 (1-2) ◽  
pp. 268-273 ◽  
Author(s):  
Concepción Domingo ◽  
Jesús García-Carmona ◽  
Eva Loste ◽  
Alejandra Fanovich ◽  
Julio Fraile ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Calcium Carbonate ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon Dioxide Media ◽  
Supercritical Carbon

scholarly journals High Pressure Vapour-Liquid Equilibrium of Volatiles in Supercritical Carbon Dioxide

2013 ◽  
Vol 34 (3) ◽  
pp. 387-392 ◽  
Author(s):  
Karina Gurgenova ◽  
Rafał Bogeł-Łukasik ◽  
Paweł Wawrzyniak
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
High Pressure ◽  
Equation Of State ◽  
Supercritical Carbon Dioxide ◽  
Process Parameters ◽  
Liquid Equilibrium ◽  
Isothermal Conditions ◽  
Selection Of ◽  
Supercritical Carbon

Abstract Binary vapour-liquid equilibrium of thymoquinone and carbon dioxide at the isothermal conditions was carried out at temperature 323.15 K and pressures from 6 to 10 MPa. The experimental data were fitted to the Soave-Redlich-Kwong equation of state. Results could be used for selection of process parameters in separation of volatiles from raw oil or for evaluation of existing separation technologies.

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