期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 66, 期 3, 页码 510-516出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2009.02.008
关键词
VOCs; Coacervate; Co-current operation; Vacuum stripping; Cloud point extraction
资金
- The Thailand Research Fund (TRF)
- Royal Golden jubilee Ph.D. fellowships
- Center for Petroleum, Petrochemicals and Advanced Materials (PPAM)
- Ratchadapiseksompote Fund
- Chulalongkorn University
- Institute for Applied Surfactant Research, University of Oklahoma
- Akzo Nobel
- Clorox
- Conoco/Philips
- Church and Dwight
- Dow
- Ecolab
- Halliburton
- Huntsman
- Oxiteno
- Procter Gamble
- Sasol North America
- Shell Chemical
- Unilever
To make a cloud point extraction (CPE) process economically feasible, the used surfactant in the concentrated or coacervate phase should be recycled and reused. We have demonstrated a co-current vacuum stripping using a 30.5-cm long column packed with glass Raschig rings effectively removes as much as 90% of the toluene from a surfactant coacervate phase solution without flooding or plugging. it was found that the apparent Henry's law constant of the volatile organic compounds (VOCs) was significantly reduced due to solubilization of VOCs in surfactant micelles, but increased substantially with increasing temperature. In addition, it was observed that the increase in hydrophobicity of the VOCs results in higher micellar solubilization in the coacervate solution, leading to lower VOC removal efficiency. However, over 87% of all studied VOCs (benzene, toluene, ethylbenzene, 1,2 dichloroethane, trichloroethylene, and tetrachloroethylene) were removed from a coacervate solution within a single stage operation. The removal of VOCs increases with decreasing surfactant concentration and VOC hydrophobicity, and also increases with increasing system temperature. (C) 2009 Elsevier B.V. All rights reserved.
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