Solubility in Supercritical Carbon Dioxide

Gupta, Ram B.; Shim, Jae‐Jin

doi:10.1201/9781420005998

Cited by 183 publications

(223 citation statements)

References 0 publications

Supporting

Mentioning

212

Contrasting

Unclassified

Order By: Relevance

“…Therefore, increment of solubility can be induced fast reaction rate. The primary component of olive oil was oleic acid, and this produced the highest solubility at 45°C and 130 bar [20]. These results indicate that olive oil could produce the highest value of biodiesel and that reaction rate can be increased by increasing the solubility of the fatty acids.…”

Section: Biodiesel Production From Various Oils In Supercritical Fluimentioning

confidence: 78%

Biodiesel Production from Various Oils Under Supercritical Fluid Conditions by Candida antartica Lipase B Using a Stepwise Reaction Method

Lee

Kwon

Kang

et al. 2009

Appl Biochem Biotechnol

View full text Add to dashboard Cite

In this study, we evaluate the effects of various reaction factors, including pressure, temperature, agitation speed, enzyme concentration, and water content to increase biodiesel production. In addition, biodiesel was produced from various oils to establish the optimal enzymatic process of biodiesel production. Optimal conditions were determined to be as follows: pressure 130 bar, temperature 45 degrees C, agitation speed 200 rpm, enzyme concentration 20%, and water contents 10%. Among the various oils used for production, olive oil showed the highest yield (65.18%) upon transesterification. However, when biodiesel was produced using a batch system, biodiesel conversion yield was not increased over 65%; therefore, a stepwise reaction was conducted to increase biodiesel production. When a reaction medium with an initial concentration of methanol of 60 mmol was used and adjusted to maintain this concentration of methanol every 1.5 h during biodiesel production, the conversion yield of biodiesel was 98.92% at 6 h. Finally, reusability was evaluated using immobilized lipase to determine if this method was applicable for industrial biodiesel production. When biodiesel was produced repeatedly, the conversion rate was maintained at over 85% after eight reuses.

show abstract

Section: Biodiesel Production From Various Oils In Supercritical Fluimentioning

confidence: 78%

Biodiesel Production from Various Oils Under Supercritical Fluid Conditions by Candida antartica Lipase B Using a Stepwise Reaction Method

Lee

Kwon

Kang

et al. 2009

Appl Biochem Biotechnol

View full text Add to dashboard Cite

show abstract

“…In the subsurface, the injected scCO 2 produces regions in which the full spectrum of mutual CO 2 -H 2 O solubility can occur [6][7][8][9]. In basalt reservoirs, the CO 2 -rich (water-bearing scCO 2 ) fluids are highly reactive with regard to the minerals present [10], and the scCO 2 may mobilize the organics, as scCO 2 is an effective solvent of organic matter [11], which has been observed in the field and in experiments with geomaterials [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. In our recent investigation, we demonstrated that simple, naturally abundant organic ligands (the protonated forms of acetate, malonate, oxalate, and citrate) were transported through water-saturated scCO 2 and their presence impacted the carbonation of forsterite [25].…”

Section: Introductionmentioning

confidence: 98%

Experimental Study of Organic Ligand Transport in Supercritical CO2 Fluids and Impacts to Silicate Reactivity

et al. 2014

View full text Add to dashboard Cite

The interactions between water-saturated supercritical carbon dioxide, organics, and minerals are relatively unknown despite being important to carbon sequestration and enhanced hydrocarbon recovery activities. The goals of this study include verification of organic transport through scCO 2 and exploration of whether organic ligands can impact carbonate formation. An in situ near-infrared spectroscopic technique was used to probe supercritical CO 2 (scCO 2 )-organic mixtures at 35 °C and 100 bar. Observation of C-H bands in the spectra collected from scCO 2 equilibrated with a Ca-acetate solution (1.7 m) provided direct evidence of organic partitioning into the scCO 2 phase. A series of high pressure X-ray diffraction experiments at 50 °C and 90 bar were performed to investigate how citrate (0.01-0.5 m) affected the coupled dissolution of forsterite and precipitation of magnesium carbonates in scCO 2 . In control experiments where no citrate was present, nesquehonite (MgCO 3 •3H 2 O) was initially produced as a metastable intermediate that was then converted to magnesite (MgCO 3 ). However, experiments with citrate promoted magnesite, rather than nesquehonite, precipitation, and at the highest concentrations reduced the extent of the carbonation reaction. This paper discusses these unique findings on organic and scCO 2 interactions that are not currently being considered in the fate and transport of CO 2 in the subsurface.

show abstract

“…The resultant supercritical fluid (SCF) has a much increased solvent capacity for many nonvolatile and thermally labile compounds. And SCFs are unique and useful as extracting agents because their solvent power can be manipulated over a wide range by adjusting temperature and pressure [1,2].…”

Section: Introductionmentioning

confidence: 99%

Micronization and characterization of drug substances by RESS with supercritical CO2

Kim

2010

Korean J. Chem. Eng.

View full text Add to dashboard Cite

A RESS (rapid expansion of supercritical solution) process for the preparation of ultra-fine drug particles with no organic solvent has been developed with supercritical CO 2 . Three drug substances with different solubility in supercritical CO 2 were used, and orifice disks and capillary tubes were adapted as an expansion device. The solubilities of drug substances in supercritical CO 2 and the effects of various operating parameters on the characteristics of the particles prepared by RESS process were experimentally investigated. The solubility of the drug substance in supercritical CO 2 had a major effect on the average diameter of the particle prepared by RESS process, and the particle diameter decreased with the solubility for all the drugs and operating conditions. The particle diameter also decreased with preexpansion temperature and increased with the hole diameter of the orifice nozzle and aspect ratio (L/D) of the capillary tube.

show abstract

Solubility in Supercritical Carbon Dioxide

Cited by 183 publications

References 0 publications

Biodiesel Production from Various Oils Under Supercritical Fluid Conditions by Candida antartica Lipase B Using a Stepwise Reaction Method

Biodiesel Production from Various Oils Under Supercritical Fluid Conditions by Candida antartica Lipase B Using a Stepwise Reaction Method

Experimental Study of Organic Ligand Transport in Supercritical CO2 Fluids and Impacts to Silicate Reactivity

Micronization and characterization of drug substances by RESS with supercritical CO2

Contact Info

Product

Resources

About