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HOMOGENEOUS HYDROLYSIS RATE CONSTANTS FOR SELECTED CHLORINATED METHANES, ETHANES, ETHENES, AND PROPANES
Citation:
Jeffers, P., L. Ward, L. Woytowitch, AND N. Wolfe. HOMOGENEOUS HYDROLYSIS RATE CONSTANTS FOR SELECTED CHLORINATED METHANES, ETHANES, ETHENES, AND PROPANES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/094 (NTIS PB90100843).
Description:
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 oC and at pH values of 3 to l4. rrhenius parapmeters were determined for both neutral and alkaline hydrolysis reactions. eactivity of these compounds in basic solutions increases in accord with the expected acidity of the most reactive hydrogen atom in the molecule. eutral hydrolysis appears to depend on both the C-CL bond strength and the degree of steric hindrance at the reaction site. nly a neutral hydrolysis process occurs for CCl4, 1,1,1-trlchloroethane, and 2,2-dichloropropane. he chlorinated ethenes and hexachloroethane react only with hydroxide under severe conditions and exhibit no neutral hydrolysis. ome 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. nvironmental hydrolysis half-lives (25 C, pH 7) range from 36 h for 2,2-dichloropropane to 1850 years for CHCL3 and to more than 10-6 years for C2CL6 nd the ethenes.
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HOMOGENEOUS HYDROLYSIS RATE CONSTANTS FOR SELECTED CHLORINATED METHANES, ETHANES, ETHENES, AND PROPANES