Hydrothermal processing of chlorinated hydrocarbons in a titanium reactor
- Los Alamos National Lab., NM (United States)
Experiments are reported on the oxidative hydrothermal destruction of chlorinated organics in a corrosion-resistant titanium reactor. Oxidation reaction conditions were 250-500 {degree}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 approximately 1.5 wt%; hydrogen peroxide was the oxidizer; sodium bicarbonate was added to achieve neutral pH. Hydrolysis occurs at low temperature, producing chloride ion and secondary organics. Carbon dioxide is the sole carbon product at 500 {degree}C. Sodium nitrate and sodium nitrite were also found to be effective oxidizers. Corrosion of the titanium was found to be slight (<0.038 mm/yr). The reaction mixture is likely not a single phase at these conditions. The destruction efficiency for trichloroethylene was estimated as 99.96% at 450 {degree}C and 60 s, with <0.02% conversion to volatile chlorinated organic byproducts. 33 refs., 9 figs., 6 tabs.
- OSTI ID:
- 414975
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 9 Vol. 30; ISSN 0013-936X; ISSN ESTHAG
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
CARBON MONOXIDE
CHEMICAL REACTORS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINATION
CORROSION
ENVIRONMENTAL IMPACTS
FOURIER TRANSFORM SPECTROMETERS
HYDROCARBONS
HYDROLYSIS
HYDROTHERMAL ALTERATION
INFRARED SPECTRA
NUMERICAL DATA
OXIDATION
PH VALUE
SODIUM NITRATES
TITANIUM