Hydrothermal Processing of Chlorinated Hydrocarbons in a Titanium Reactor

Experiments are reported on the oxidative hydrothermal destruction of chlorinated organics in a cor rosion-resistant titanium reactor. Oxidation reaction conditions were 250−500 °C near 650 bar and reaction times of 30−100 s in a continuous-flow reactor. Trichloroacetic acid, trichloroethylene, and...

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Bibliographic Details
Published in:Environmental science & technology 1996-09, Vol.30 (9), p.2790-2799
Main Authors: Foy, Bernard R, Waldthausen, Kurt, Sedillo, Michael A, Buelow, Steven J
Format: Article
Language:English
Subjects:
Applied sciences
Chemical elements
Exact sciences and technology
General treatment and storage processes
Hydrocarbons
Pollution
Wastes
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Summary:Experiments are reported on the oxidative hydrothermal destruction of chlorinated organics in a cor rosion-resistant titanium reactor. Oxidation reaction conditions were 250−500 °C near 650 bar and reaction times of 30−100 s in a continuous-flow reactor. Trichloroacetic acid, trichloroethylene, and 1,1,1-trichloroethane behaved similarly. The organic concentration was ∼1.5 wt %; hydrogen peroxide was the oxidizer; sodium bicarbonate was added to achieve neutral pH. Hydrolysis occurs at low temper ature, producing chloride ion and secondary organics. Carbon dioxide is the sole carbon product at 500 °C. Sodium nitrate and sodium nitrite were also found to be effective oxidizers. Corrosion of the titanium was found to be slight (
ISSN:0013-936X
1520-5851
DOI:10.1021/es960041o