Trichloroethylene

(redirected from trichloroethene)
Also found in: Dictionary, Thesaurus, Medical.

trichloroethylene

[trī¦klȯr·ō′eth·ə‚lēn]
(organic chemistry)
CHCl:CCl2 A heavy, stable, toxic liquid with a chloroform aroma; slightly soluble in water, soluble with greases and common organic solvents; boils at 87°C; used for metal degreasing, solvent extraction, and dry cleaning and as a fumigant and chemical intermediate.

Trichloroethylene

 

(CC12ᆖCHCl), a colorless liquid with an odor resembling that of chloroform. Boiling point, 87.2°C; density, 1.465 g/cm3 at 20°C.

Trichloroethylene is poorly soluble in water (0.11 g per 100 g at 25°C) and forms azeotropic mixtures with water (boiling point, 73.6°C; 5.4 percent water), methyl and ethyl alcohols, and acetic acid. Upon prolonged storage in the light, trichloroethylene is gradually oxidized by atmospheric oxygen to phosgene, COCl2. Upon exposure to concentrated nitric acid, trichloroethylene forms chloropicrin, CC13NO2, and other substances. The principal industrial method of obtaining trichloroethylene is the dehydrochlorination of symmetrical tetrachloroethane by boiling with lime or by pyrolysis at 400°–500°C.

Trichloroethylene has high dissolving power; it readily dissolves fats, waxes, resins, rubber, sulfur, and phosphorus. It also has a low boiling point and insignificant toxicity, and it is incombustible. Therefore, it is widely used in the removal of fat from fabrics and hides, the degreasing of metals, and the extraction of fats and oils from natural raw materials, as well as for dry-cleaning of clothing. The maximum permissible concentration of trichloroethylene fumes in the air is 0.05 mg per liter.

References in periodicals archive ?
nov., a strictly anaerobic bacterium that reductively dechlorinates tetra- and trichloroethene in an anaerobic respiration," Archives of Microbiology, vol.
Crittenden, "Trichloroethene degradation by UV/[H.sub.2][O.sub.2] advanced oxidation process: product study and kinetic modeling," Environmental Science & Technology, vol.
Based on comparable calculations from halogenated gas emissions in the atmosphere from present-day salt seas in the south of Russia, the scientists calculated that from the Zechstein Sea alone an annual VHC emissions rate of at least 1.3 million tonnes of trichloroethene, 1.3 million tonnes of tetrachloroethene, 1.1 million tonnes of chloroform as well as 0.050 million tonnes of methyl chloroform can be assumed.
Trichloroethene (TCE) was a common degreasing agent in dry-cleaning and machining industries, but the health hazards associated with this compound have largely restricted its use.
2015) and acetone, methyl ethyl ketone, methyl acetate, benzene, and trichloroethene (Spokas et al.
Subsequent soil and groundwater tests confirmed "extremely high levels" of trichloroethene (TCE) at the Heller property, which on-site U.S.EPA coordinator Cris D'Onofrio categorized as a "highly contaminated" spill site.
Methyltert-butylether (MTBE) (0.7 [micro]g/L), trichloroethene (2 [micro]g/L), 2,6-di-tert-butylquinone (2.3 [micro]g/L), and 1,2-dichloropropane (2 [micro]g/L) were detected in one private well.
Among the contaminants are hexavalent chromium, trichloroethene, chloroform, arsenic, nitrate, nitrite, uranium and methylene chloride.
They reported that 7 different VOCs, 1,1-Dichloroethene, methylene chloride, chloroform, benzene, trichloroethene, tetrachloroethene and styrene could be found in printing facilities.
Sherwood Lollar et al., "Stable carbon isotope evidence for intrinsic bioremediation of tetrachloroethene and trichloroethene at Area 6, Dover Air Force Base," Environmental Science and Technology 35 (2001), pp.
Injecting certain simple organic molecules (like simple sugars, molasses or soybean oil) into the ground as a food (i.e., carbon) source can promote the growth of these microbes and result in complete destruction of the chemicals they are "breathing." The chemicals amenable to this type of bioremediation include the commonly used solvents perchloroethene and trichloroethene. Today a number of anaerobic bioremediation amendments are commercially available including a product called HRC and various emulsified soy oil products.