Solubilization of trace organics in block copolymer micelles for environmental separation using membrane extraction principles. Progress report, May 1, 1992--December 31, 1992
The solubilization of a range of polycyclic aromatic hydrocarbons in block copolymer micelles has been studied as a function of polymer composition, architecture, and temperature. Micelle formation is favored at high temperatures, leading to significant enhancements in solubilization capacity. At low temperatures, however, micelles do not form and the solubilization capacity of the block copolymer solution for the organics is low; this provides a convenient method for the regeneration of micellar solutions used as ``solvents`` in the treatment of contaminated feed streams using membrane extraction principles. It has also been shown (in collaboration with K.P. Johnston of University of Texas, Austin) that supercritical CO{sub 2} can be used effectively for micelle regeneration. Theoretical calculations of the structure of block copolymer micelles in the presence and absence of solutes using self-consistent mean-field lattice theories have successfully captured the trends observed with changing polymer composition and architecture, often quantitatively. The temperature and composition dependence of the micellar properties were determined by allowing the individual polymer segments to assume both polar and non-polar conformations.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-92ER14262
- OSTI ID:
- 10109673
- Report Number(s):
- DOE/ER/14262--1; ON: DE93006000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105
54 ENVIRONMENTAL SCIENCES
540320
CARBON DIOXIDE
CHEMICALS MONITORING AND TRANSPORT
COPOLYMERS
MICELLAR SYSTEMS
POLYCYCLIC AROMATIC HYDROCARBONS
POLYETHYLENE GLYCOLS
PROGRESS REPORT
PYRENE
REGENERATION
REMOVAL
SEPARATION PROCEDURES
SOLUBILITY
SOLUTIONS
SUPERCRITICAL GAS EXTRACTION