Sj. Macnaughton et Nr. Foster, SOLUBILITY OF DDT AND 2,4-D IN SUPERCRITICAL CARBON-DIOXIDE AND SUPERCRITICAL CARBON-DIOXIDE SATURATED WITH WATER, Industrial & engineering chemistry research, 33(11), 1994, pp. 2757-2763
As part of a program of the assessment of supercritical fluid processe
s for environmental applications, the solubilities of two priority pol
lutants in supercritical CO2 were investigated. The solubilities of th
e pesticide 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane (DDT) and th
e herbicide (2,4-dichlorophenoxy)acetic acid (2,4-D) have been determi
ned in supercritical carbon dioxide at 313, 323, and 333 K for pressur
es ranging from 104 to 208 bar. While saturation of carbon dioxide wit
h water had negligible effect on the solubility of DDT, a solubility e
nhancement of up to 90% for the highly polar 2,4-D was observed. The d
ata were modeled using the Peng-Robinson equation of state which, with
an empirical modification, provides a good description of the behavio
r of the systems investigated. Preliminary solubility data from a mixe
d solute bed containing both DDT and 2,4-D are also reported.