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RECORD NUMBER: 18 OF 39

OLS Field Name OLS Field Data
Main Title Homogeneous Hydrolysis Rate Constants for Selected Chlorinated Methanes, Ethanes, Ethenes, and Propanes.
Author Jeffers, P. M. ; Ward, L. M. ; Woytowitch, L. M. ; Wolfe, N. L. ;
CORP Author Environmental Research Lab., Athens, GA. ;State Univ. of New York Coll. at Cortland. Dept. of Chemistry.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/094;
Stock Number PB90-100843
Additional Subjects Hydrolysis ; Reaction kinetics ; Chlorine aliphatic compounds ; Water pollution ; Experimental design ; Catalysts ; Methanes ; Ethanes ; Ethylene ; Propane ; Reprints ; Homogeneous reactions
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB90-100843 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/10/1990
Collation 7p
Abstract
Hydrolysis rate constants of 18 chlorinated methanes, ethanes, ethenes, and propanes have been measured in dilute aqueous solutions within the temperature range of 0 to 180 C and at pH values of 3 to 14. Arrhenius parameters were determined for both neutral and alkaline hydrolysis reactions. Reactivity of these compounds in basic solutions increases in accord with the expected acidity of the most reactive hydrogen atom in the molecule. Neutral hydrolysis appears to depend on both the C-Cl bond strength and the degree of steric hindrance at the reaction site. Only a neutral hydrolysis process occurs for CCl4, 1,1,1-trichloroethane, and 2,2-dichloro-propane. The chlorinated ethenes and hexachloroethane react only with hydroxide under severe conditions and exhibit no neutral hydrolysis. Some of these compounds eliminate HCl, whereas others substitute OH for Cl to form alcohols that may react further to give aldehydes or carboxylic acids as products. Environmental hydrolysis half-lives (25 C, pH 7) range from 36 h for 2,2-dichloropropane to 1850 years for CHCl3 and to more than 1,000,000 years for C2Cl6 and the ethenes. (Copyright (c) 1989 American Chemical Society.)