Reductive dechlorination of polychlorinated biphenyl compounds in supercritical carbon dioxide

Download
  1. (PDF, 217 KB)
  2. Get@NRC: Reductive dechlorination of polychlorinated biphenyl compounds in supercritical carbon dioxide (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1039/b002740p
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleGreen Chemistry
Volume2
Issue4
Pages127132; # of pages: 6
AbstractPolychlorinated biphenyl mixtures (Aroclor 1242 and 1248) are dechlorinated efficiently (but not quantitatively) with heated columns of zero-valent metal or bimetallic mixture in a continuous process. Supercritical carbon dioxide transfers the substrates through the reactor and cumulative ten minute fractions of eluate are trapped in hexane during 1 h of continued operation. The extent of dechlorination is influenced appreciably by the identity of the zero-valent (ZV) metal (Feº > Niº > Znº > Cuº), by the temperature (400 ≫ 300 > 200 °C) and pressure (≤4500 psi) within the reactor column(s) and especially by the composition of the feedstock. Although water is both unnecessary and detrimental to the dechlorination yields, the inclusion of methyl ketone(s) in the feedstock solution appreciably improves the extent of the dechlorination. Two columns (25 Χ 1 cm) of Agº/Feº or Agº/Niº bimetallic mixture result in a virtually quantitative dechlorination of substrate Aroclor 1242 ( ~ 28 mg min⁻¹). Moreover, during 1 h of continued operation, the dechlorinations are very repeatable. In preliminary treatments of 30% (v/v) acetone–hexane extracts (ca. 600 ppm PCBs) of a spiked sandy loam soil, no chlorinated organics could be detected in the PCB eluting region by GC-MS.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Chemical Process and Environmental Technology
Peer reviewedNo
NRC number51876
NPARC number13063726
Export citationExport as RIS
Report a correctionReport a correction
Record identifierc42b3b7d-b499-466d-8cf2-3795cfdddde6
Record created2009-12-04
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)