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Residual Monomer Reduction in Polymer Latex Products by Extraction with Supercritical Carbon Dioxide
Author(s) -
Aerts Marijke,
Meuldijk Jan,
Kemmere Maartje,
Keurentjes Jos
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000052
Subject(s) - monomer , supercritical carbon dioxide , extraction (chemistry) , stripping (fiber) , supercritical fluid extraction , polymer , supercritical fluid , chromatography , materials science , chemical engineering , residual oil , styrene , carbon dioxide , chemistry , copolymer , organic chemistry , composite material , engineering
Summary: Extraction of residual monomer from a latex product with supercritical carbon dioxide ((sc)CO 2 ) in a column was studied. Operating conditions were chosen at 35 °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)CO 2 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 H 2 O/CO 2 interface. The drift‐flux approach was followed to determine the column flooding conditions. Small column volumes are obtained. (sc)CO 2 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.