Journal
POLYMER REACTION ENGINEERING - 10TH INTERNATIONAL WORKSHOP
Volume 302, Issue -, Pages 297-304Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.201000052
Keywords
extraction; latex; partitioning; residual monomer; shuttle effect; supercritical carbon dioxide
Categories
Funding
- Emulsion Polymerization
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Extraction of residual monomer from a latex product with supercritical carbon dioxide ((sc)CO2) in a column was studied. Operating conditions were chosen at 35 degrees C and 100 bar. For reducing the residual styrene level in a polystyrene latex from 10(4) ppm to 100 ppm and from 10(4) ppm to 10 ppm, a countercurrent bubble column with latex as continuous and (sc)CO2 as dispersed phase is suggested. Monomer partitioning was demonstrated to be a key parameter in the equipment design. Monomer transport was found to be governed by the shuttle effect, caused by Brownian motion of the latex to and from the H2O/CO2 interface. The drift-flux approach was followed to determine the column flooding conditions. Small column volumes are obtained. (sc)CO2 is a promising extraction medium for residual monomer reduction in latex products. Performance towards steam stripping is better as the final residual monomer level becomes lower.
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