Title: Diethanolamine
CAS Registry Number: 111-42-2
CAS Name: 2,2¢-Iminobisethanol
Additional Names: 2,2¢-iminodiethanol; diethylolamine; bis(hydroxyethyl)amine; 2,2¢-dihydroxydiethylamine
Molecular Formula: C4H11NO2
Molecular Weight: 105.14
Percent Composition: C 45.69%, H 10.55%, N 13.32%, O 30.43%
Line Formula: (HOCH2CH2)2NH
Literature References: Produced along with mono- and triethanolamine by ammonolysis of ethylene oxide. See refs under Ethanolamine. Toxicity study: H. F. Smyth et al., J. Ind. Hyg. Toxicol. 23, 259 (1941).
Properties: Deliquescent prisms, mp 28°. Usually offered as a viscous liquid. Mild ammoniacal odor. d430 1.0881; d460 1.0693. One U.S. gallon weighs 9.09 lbs at 30°. Viscosity at 30°: 351.9 cP; at 60°: 53.85 cP. bp760 268.8°; bp150 217°; bp0.01 20°. Strong base: pH of 0.1N aq soln: 11.0. nD30 1.4753. Dipole moment 2.81. Flash pt 300°F. Miscible with water, methanol, acetone. Soly at 25° in benzene: 4.2%, in ether: 0.8%, in carbon tetrachloride: <0.1%, in n-heptane: <0.1%. LD50 orally in rats: 12.76 g/kg (Smyth).
Melting point: mp 28°
Boiling point: bp760 268.8°; bp150 217°; bp0.01 20°
Flash point: Flash pt 300°F
Index of refraction: nD30 1.4753
Density: d430 1.0881; d460 1.0693
Toxicity data: LD50 orally in rats: 12.76 g/kg (Smyth)
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, nose and throat; eye and skin burns, corneal necrosis; lacrimation, cough, sneezing. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 104.
Use: To scrub gases as indicated under ethanolamine. Diethanolamine can be used with cracking gases and coal or oil gases which contain carbonyl sulfide that would react with monoethanolamine. As rubber chemicals intermediate. In the manuf of surface active agents used in textile specialties, herbicides, petr demulsifiers. As emulsifier and dispersing agent in various agricultural chemicals, cosmetics, and pharmaceuticals. In the production of lubricants for the textile industry. As humectant and softening agent. In organic syntheses.

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