ethylene glycol
ethylene glycol
ethylene glycol
gly•col
(ˈglaɪ kɔl, -kɒl)n.
ethylene gly·col
(glī′kôl′)| Noun | 1. | ethylene glycol - a sweet but poisonous syrupy liquid used as an antifreeze and solvent |
| 单词 | ethylene glycol | |||
| 释义 | ethylene glycolethylene glycolethylene glycolgly•col(ˈglaɪ kɔl, -kɒl)n. ethylene gly·col(glī′kôl′)
ethylene glycolethylene glycol:see glycolglycol, dihydric alcohol in which the two hydroxyl groups are bonded to different carbon atoms; the general formula for a glycol is (CH2)n(OH)2. ..... Click the link for more information. . Ethylene Glycol(also 1,2-ethanediol), HOCH2CH2OH, the simplest of the glycols. Ethylene glycol takes the form of a colorless, viscous liquid with a sweet taste. It has a melting point of – 12.3°C, a boiling point of 196°C, and a density of 1.113 g/cm3 at 20°C. Miscible in all proportions with water, alcohol, and acetone, it is poorly soluble in ether and insoluble in chloroform, aliphatic hydrocarbons, and aromatic hydrocarbons. Ethylene glycol is hygroscopic. An important property of ethylene glycol is its capacity to produce a marked lowering of the freezing point of water. A 40-percent solution of ethylene glycol in water has a freezing point of – 25°C, and a 60-percent solution has a freezing point of – 40°C. For this reason, ethylene glycol is commonly used in the manufacture of antifreezes. Similar to other dihydric alcohols, ethylene glycol forms monoglycolates and diglycolates (such as HOCH2CH2ONa and NaOCH2CH2ONa), ethers, and esters. Among the other derivatives of ethylene glycol are cellusolves (the monoethers HOCH2CH2OR, where R is a hydrocarbon) and polyesters, including polyethylene terephthalate, that have the general formula (—OCH2CH2OCO—R—CO—)n; cellosolves are used as solvents, and ethylene glycol polyesters are used in the preparation of Dacron and similar synthetic fibers (seeLAVSAN and POLYESTER FIBER). Nitroglycol, a diester of ethylene glycol and nitric acid, is an explosive. The principal industrial method for the production of ethylene glycol is the hydration of ethylene oxide at a pressure of 10 atmospheres and a temperature of 190°-200°C (or at 1 atmosphere and 50°-100°C) in the presence of 0.1–0.5 percent sulfuric or ortho-phosphoric acid; diethylene glycol and a small quantity of higher polymeric homologues of ethylene glycol are formed as by-products in this process. Ethylene glycol is used on a limited scale as a solvent for printer’s inks and certain other dyes, and it is used in the production of various inks, including inks for ball-point pens. It is also used in organic synthesis. Ethylene glycol is toxic. M. K. GRACHEV ethylene glycol[′eth·ə·lēn ′glī‚kȯl]ethylene glycolethylene glycolethylene[eth´ĭ-lēn]Ethylene oxide is toxic because it alkylates tissue constituents; it is carcinogenic and may produce adverse reproductive effects. Inhalation may cause nausea, vomiting, and neurological disorders, and severe exposure may be fatal. Before items exposed to ethylene oxide can be used they must be aired for 5 days at room temperature or for 8 hours at 120° C to remove any trace of the gas. This is also true for articles of clothing, such as gloves and shoes, that have been exposed, because chemical burns can occur when the contaminated clothing comes in contact with the skin. gly·col(glī'kol),ethylene glycolToxicology A chemical used as an antifreeze, which is highly toxic–50-100 ml and may be fatal ethanol surrogate occasionally used as an inebrient by alcoholics EG intoxication stagesethylene glycolA compound used mainly as an antifreeze additive. If ingested it may cause severe nervous system depression that may be fatal. Metabolism may lead to severe acidosis.ethylene glycol
Synonyms for ethylene glycol
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