An environmentally friendly approach for contaminants removal using supercritical CO2 for remanufacturing industry

Liu, Wei Wei; Zhang, Bin; Li, Yanzeng; He, Yanming; Zhang, Hongchao

doi:10.1016/j.apsusc.2013.11.102

Cited by 55 publications

(24 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the past few decades supercritical carbon dioxide (sc-CO2) has been used for various applications [3][4] and interest still remains high today [5][6][7][8]. As such CO2 is a nonpolar molecule with low dielectric constant and solubility parameter, which makes it unsuitable for dissolving polar and high-molecular-weight materials [9].…”

Section: Introductionmentioning

confidence: 99%

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Mohamed

Ardyani

Sagisaka³

et al. 2015

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

The article addresses an interesting issue in the development of hybrid surfactants for waterin-CO2 (w/c) microemulsion stabilisation: the role of surfactant headgroup on the surfactant performance. The synthetic procedure, aqueous properties, and phase behaviour of a new hybrid sulfoglutarate surfactant are described. The compound resembles sulfosuccinate surfactants, commonly used to stabilize w/c phases, but with an extra methylene group incorporated into the hydrophilic headgroup. For comparison purposes, the related hydrocarbon (AOT14 and AOT14GLU) and fluorocarbon (di-CF2 and di-CF2GLU) surfactants are used to form w/c microemulsions. In general, the aqueous properties and w/c phase stability of both sulfoglutarates and sulfosuccinates are found to be similar, which shows the secondary role of the hydrophilic headgroup. Interestingly, the newly synthesised hybrid CF2/AOT14GLU (sodium (4H,4H,5H,5H,5H-pentafluoropentyl-2,2-dimethyl-1-propyl)-2-sulfoglutarate) proved to be more efficient than the normal sulfosuccinate, hybrid CF2/AOT14 (Ptrans = 383 bar, γcmc = 26.8 mN m -1 ) in terms of the aqueous behaviour and w/c phase stability.Switching to the sulfoglutarate compound, hybrid CF2/AOT14GLU (Ptrans = 232 bar, γcmc = 20.6 mN m -1 ) more effectively decreases the air-water surface tension by about ~ 5 mN m -1 as compared to the sulfosuccinate. High-pressure phase behaviour studies show significant improvements in stabilising w/c microemulsions at much lower cloud pressures. The results indicate distinct effects of the headgroup structure on the phase behaviour and physicochemical properties, particularly for this hybrid surfactant.

show abstract

Section: Introductionmentioning

confidence: 99%

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Mohamed

Ardyani

Sagisaka³

et al. 2015

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

show abstract

“…Therefore, the organic contaminants can be removed significantly. In addition, supercritical CO 2 fluid has strong diffusibility and low surface tension, so it is able to enter small cracks and removes the grease in contaminants [18]. In high pressure environment, supercritical CO 2 can make stubborn deposits become loose contaminants, which is easy to be removed during the subsequent cleaning process.…”

Section: Microscopy Analysismentioning

confidence: 99%

Supercritical CO2 Cleaning of Carbonaceous Deposits on Diesel Engine Valve

Liu¹,

Qing²,

Li³

et al. 2015

Procedia CIRP

View full text Add to dashboard Cite

Carbonaceous deposits can reduce the durability and performance of diesel engines. Chemical cleaning methods are widely used to remove the deposits in remanufacturing industry but the wasted liquid is harmful to the environment. In this paper the supercritical CO 2 cleaning technology, an environmentally friendly approach, has been used to remove these contaminants. The surfaces of diesel engine valve before and after cleaned were examined by field emission scanning electron microscope (FE-SEM) and Fourier transform infrared spectroscope (FT-IR).The testing results showed that most organic compounds were dissolved and the stubborn contaminants were changed to be removed easily after cleaning by supercritical CO 2 fluid. The new cleaning method can reduce carbonaceous deposits significantly without changing the surface properties of the diesel engine valve.

show abstract

“…Supercritical carbon dioxide (sc-CO2) is considered a desirable solvent for green materials and chemical processing [1][2], so sc-CO2 has been used for various applications [3][4] and interest still remains high today [5][6][7][8]. As such CO2 is a nonpolar molecule with low dielectric constant and solubility parameter, which makes it unsuitable for dissolving polar and high-molecular-weight materials [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant headgroup on low-fluorine-content CO2-philic hybrid surfactants

Mohamed

Ardyani

Bakar

et al. 2016

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms AbstractThe article addresses the role of surfactant headgroup structure on hybrid surfactant performance for water-in-CO2 (w/c) microemulsion stabilisation. The synthetic procedure, aqueous properties, and phase behaviour of a new hybrid sulfoglutarate surfactant are described. The sulfoglutarate version has an extra methylene group incorporated into the hydrophilic headgroup. The related hydrocarbon (AOT14 and AOT14GLU) and fluorocarbon (di-CF2 and di-CF2GLU) surfactants were used to form w/c microemulsions. For these two groups, the aqueous properties and w/c phase stability of both sulfoglutarates and sulfosuccinates were found to be similar. The newly synthesized hybrid CF2/AOT14GLU (sodium (4H,4H,5H,5H,5H-pentafluoropentyl-2,2-dimethyl-1-propyl)-2-sulfoglutarate)proved to be more efficient than the normal sulfosuccinate, hybrid CF2/AOT14 in terms of the aqueous behaviour and w/c phase stability. Hybrid CF2/AOT14GLU more effectively decreased the air-water surface tension by ~ 2 mN m -1 and lowering the cloud pressures on CO2 by ~150 bar.

show abstract

An environmentally friendly approach for contaminants removal using supercritical CO2 for remanufacturing industry

Cited by 55 publications

References 37 publications

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions

Supercritical CO2 Cleaning of Carbonaceous Deposits on Diesel Engine Valve

Effect of surfactant headgroup on low-fluorine-content CO2-philic hybrid surfactants

Contact Info

Product

Resources

About