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SOLUBILITY OF ORGANIC BIOCIDES IN SUPERCRITICAL CO2 AND CO2+ COSOLVENT MIXTURES
Citation:
SahleDemessie*, E, U R. Pillai**, S. Junsophonsri, AND K. L. Levien. SOLUBILITY OF ORGANIC BIOCIDES IN SUPERCRITICAL CO2 AND CO2+ COSOLVENT MIXTURES. Marsh, K.N. (ed.), CHEMICAL & ENGINEERING DATA. American Chemical Society, Washington, DC, 48(3):541-547, (2003).
Description:
Solubilities of four organic biocides in supercritical carbon dioxide (Sc-CO2) were measured using a dynamic flowr apparatus over a pressure range of 10 to 30 MPa and temperature of 35-80 degrees C. The biocides studied were: Amical-48 (diiodomethyl p-tolyl sulfone), chlorothalonil (tetrachloroisophthalonitrile), TCMTB (2-(thiocyanomethylthio) benzothiazole, and tebuconazole (a-[2-(4-chlorophenyl)ethyl]-a-(1,1-dimethylethyl)-1H-1, 2,4-triazole-1-ethanol). Data represented effects of temperature and pressure on biocide solubility. Measured solubilities were correlated with density of pure solvent. The effects of methanol and acetone as cosolvents on the solubility of TCMTB and tebuconazole were determined at 50 and 65 degrees C and at selected pressures between 10 and 30 MPa. The introduction of 3 mol% acetone or methanol increased the solubilities of tebuconazole by a factor of 3 to 7. The cosolvent effect decreased with increase in pressure. At 5 to 10 mol% of cosolvent, solubility of either biocides increased with the amount of cosolvents, however, the increase was more significant for tebuconazole than for TCMTB.