COLL 522 |
| Suratsawadee Kungsanant1, Boonyarach Kitiyanan1, Somchai Osuwan1, and John F. Scamehorn2. (1) Petrochemical Technology, The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12 , Phayathai Road, Pathumwan, Bangkok, 10330, Thailand, (2) 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 |
| To make the cloud point extraction (CPE) a more economically attractive process, recovery of surfactant from the concentrated solution from the process coacervate phase containing high concentrations of surfactant and pollutant, is necessary. This study utilized a continuous bench-scale flash vacuum column to strip out toluene from a coacervate phase containing t-octylphenolpolyethoxylate. The column was a differential stripper packed with glass Raschig rings and operated under rough vacuum. The performance of co-current flash vacuum stripping was evaluated by comparison to equilibrium vapor-liquid partition coefficients of the toluene. The apparent Henry’s constant in the coacervate phase is lower than in water due to partitioning of toluene into surfactant micelles. At liquid loading rates lower than 0.29 cm/min, the overall mass transfer coefficient ( Kx a ) is greatly reduced because of channeling. However, at higher liquid loading rate, channeling is eliminated, leading to higher Kx a. At a pressure greater than 100 torr, the effect of pressure on Kx a is insignificant. Nevertheless, the Kx a increases significantly as harder vacuum is used. |
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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 |