Trichloroethylene

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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 ?
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.
The presence of MTBE, trichloroethene, and other volatile organic chemicals in well water in the Rogers-Eubanks community, however, suggests that further investigation of groundwater quality and provision of improved water sources may be advisable.
They reported that 7 different VOCs, 1,1-Dichloroethene, methylene chloride, chloroform, benzene, trichloroethene, tetrachloroethene and styrene could be found in printing facilities.
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.
The chemicals amenable to this type of bioremediation include the commonly used solvents perchloroethene and trichloroethene.
In a $900,000 project, researchers this summer will begin treating groundwater contaminated with trichloroethene, or TCE, from two special wells at a site near North Base.
3) Chamber scenario (exposure to trichloroethene from a controlled exposure chamber experiment): US Air Force, Wright Patterson AFB, OH; contact: Jeff Fisher; Research Triangle Institute, Research Triangle Park, NC; contact: Paul Kizakevich
Tucson, Arizona) cleaned about 40,000 gal of groundwater contaminated with trichloroethene (TCE) and tetrachloroethene (PCE), which were present at concentrations of about 1,000 and 100 mg/L, respectively.
Historical industrial activity has contaminated the soil and groundwater with chemicals, including tetrachloroethene (PCE), trichloroethene (TCE), 1,1-dichloroethene (1,1-DCE), and 1,4-dioxane.
Kirk's attorneys were able to prove to the jury that she was exposed to a chemical called trichloroethene (TCE) while her mother was pregnant with her, and also as a child by playing in the nearby creeks and streams and being in contact with the soil in the area.
Nephrotoxic and genotoxic N-acetyl-S-dichlorovinyl-L-cysteine is a urinary metabolite after occupational 1,1,2-trichloroethene exposure in humans: Implications for the risk of trichloroethene exposure.