COLL 518 |
| Phanphat Taechangam1, Somchai Osuwan1, Thirasak Rirksomboon1, Punjaporn Weschayanwiwat2, and John F. Scamehorn3. (1) Petrochemical Technology, The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand, (2) Natural Research Center for Environmental and Hazardous Waste Management, Chulalongkorn University, Soi Chula 12, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand, (3) Institute for Applied Surfactant Research and School of Chemical Engineering and Materials Science, The University of Oklahoma, 100 E. Boyd , EC, Room R-335, Norman, OK 73019 |
| The homologous series of alcohol ethoxylate (AE) and alkylphenol ethoxylate (APE) nonionic surfactants with varied alkyl chain length and number of ethylene oxide group were utilized as the separating agent in the cloud point extraction (CPE) of phenol from the wastewater. An increase in alkyl chain length and a decrease in number of ethylene oxide group can reduce the cloud point temperature, which influences the extraction efficiency. The phase separation of solutions containing nonionic surfactant occurs if the temperature of the solution is higher than the cloud point temperature. The micellar rich phase or coacervate phase, and the micellar dilute phase are formed. Phenol contained in the wastewater, will solubilize into the micelles and concentrate in the coacervate phase. The concentrations of nonionic surfactant and phenol in both phases were analyzed and the relative phase volume of each phase was measured. The effect of nonionic surfactant molecular structure on the CPE with and without added electrolyte will be discussed. |
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Environmental Colloids
2:00 PM-3:40 PM, Thursday, April 1, 2004 Marriott -- Grand Ballroom H, Oral
Division of Colloid and Surface Chemistry |