以溶劑萃取法回收應用在界面活性劑萃取程序的非離子界面活性劑的研究

黃敏獅

doi:10.6844/NCKU.2011.02269

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以溶劑萃取法回收應用在界面活性劑萃取程序的非離子界面活性劑的研究

Study on Recovery of Nonionic Surfactants by Solvent Extraction after Surfactant-Based Extraction Processes

黃敏獅 , Masters　　Advisor：陳炳宏　　

英文 DOI： 10.6844/NCKU.2011.02269

濁點萃取（CPE）； L3相萃取；多環芳香烴（PAHs）；非離子表面活性劑；溶劑萃取；烷烴；醇； ASTM D2959 - 95 ； HPLC分析； cloud point extraction (CPE) ； L3-phase extraction ； polycyclic aromatic hydrocarbons (PAHs) ； nonionic surfactant ； solvent extraction ； alkane ； alcohol ； ASTM D2959-95 ； HPLC analysis

Abstract │ Reference (87) │ Altmetrics

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Solvent extraction method has been successfully attempted to remove 9 compounds of polycyclic aromatic hydrocarbons (PAHs) and to recover nonionic surfactant Tergitol 15-S-7 and Tergitol 15-S-5 contained in the surfactant-rich phase. This recovery is necessary to make the process more economical and environmental friendly. The HPLCs equipped with UV-Vis and Fluorescence detectors were used to determine individual concentration of PAHs. The surfactant concentration was measured according to the standard test method ASTM D2959-95.
In this work, various alkanes have been employed to separate surfactants from coexisting PAH solutes. These alkanes include n-octane, n-decane, n-dodecane, n-tetradecane, and n-hexadecane. Various alcohols, such as ethanol, n-propanol, iso-propanol, n-butanol, and iso-butanol were also used to decrease the hydrophobicity of the system. With introduction of these solvents, the PAH-containing surfactant-rich phase tends to phase-separate into two coexisting phases: the upper organic phase and the lower hydrophilic phase. No PAHs was detected in the lower hydrophilic phase after solvent extraction, while the surfactant might be distributed in both phases.
Among various alkanes used, n-dodecane worked the best since it produced the maximum PAHs recovery in the upper organic phase after solvent extraction, while retaining more surfactant in the lower hydrophilic phase. By using this solvent and several variations of weight ratio, ca. 60-63% of surfactant could be recovered from the surfactant-rich phase after a CPE. The optimal condition was 1:1 or 1:0.75 surfactant-rich phase/solvent weight ratios. Addition of n-dodecane in 1:1 weight ratio with surfactant-rich phase after L3-phase extraction, added with 15 wt-% of n-propanol or iso-propanol can recover 56% of Tergitol 15-S-5 contained in the surfactant-rich phase.

Keywords: cloud point extraction (CPE); L3-phase extraction; polycyclic aromatic hydrocarbons (PAHs); nonionic surfactant; solvent extraction; alkane; alcohol; ASTM D2959-95; HPLC analysis

Reference ( 87 ) 〈TOP〉

[1] Tsai, P.J., et al., “Health-Risk Assessment for Workers Exposed to Polycyclic Aromatic Hydrocarbons (PAHs) in a Carbon Black Manufacturing Industry”, Sci. Total Environment, 278(1-3), p. 137-150, (2001)
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[4] Agency for Toxic Substances and Disease Registry, “Polycyclic Aromatic Hydrocarbons (PAHs), http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=121&tid=25”, (1996)
連結：
[10] Villaizan, M., J.S. Lozano, and M.A.L. Yusty, “Determination of Polycyclic Aromatic Hydrocarbons in Drinking and Surface Waters from Galicia (NW SPAIN) by Constant Wavelength Synchronous Spectrofluorometry”, Talanta, 42(7), p. 967-970, (1995)
連結：
[12] Llompart, M.P., R.A. Lorenzo, R. Cela, K. Li, K. Jacqueline, M.R Bélanger, and J.R Jocelyn Paré, “Evaluation of Supercritical Fluid Extraction, Microwave-Assisted Extraction and Sonification in the Determination of Phenolic Compounds from Various Soil Matrices”, J. Chromatogr. A, 774, 243-251, (1997)
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