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Methyldiethanolamine, also known as N-Methyldiethanolamine (MDEA) and more commonly as MDEA, is the organic compound with the formula CH3N(C2H4OH)2.
N-Methyldiethanolamine (MDEA) is a colorless liquid with an ammonia odor.
N-Methyldiethanolamine (MDEA) is miscible with water, ethanol and benzene.
CAS: 105-59-9
MF: C5H13NO2
MW: 119.16
EINECS: 203-312-7
Synonyms
N,N-BIS(2-HYDROXYETHYL)METHYLAMINE;N-METHYL-2,2'-IMINODIETHANOL;N-METHYL-2,2-IMINOBIS(ETHANOL);N-METHYLDIETHANOLAMINE;N-METHYL-N-(2-HYDROXYETHYL)-2-AMINOETHANOL;METHYL DIETHANOLAMINE;MDEA;BIS(2-HYDROXYETHYL)METHYLAMINE
A tertiary amine, N-Methyldiethanolamine (MDEA) is widely used as a sweetening agent in chemical, oil refinery, syngas production and natural gas.
Similar compounds are N-Methyldiethanolamine (MDEA), a primary amine, and diethanolamine (DEA), a secondary amine, both of which are also used for amine gas treating.
N-Methyldiethanolamine (MDEA)'s defining characteristic when compared to these other amines is its ability to preferentially remove H2S (and strip CO2) from sour gas streams.
N-Methyldiethanolamine (MDEA)'s popularity as a solvent for gas treating stems from several advantages it has when compared to other alkanolamines.
One of these advantages is a low vapor pressure, which allows for high amine compositions without appreciable losses through the absorber and regenerator.
N-Methyldiethanolamine (MDEA) is also resistant to thermal and chemical degradation and is largely immiscible with hydrocarbons.
N-Methyldiethanolamine (MDEA) is a common base note in perfumes to allow the fragrance to last.
Lastly, N-Methyldiethanolamine (MDEA) has a relatively low heat of reaction with hydrogen sulfide and carbon dioxide, which allows for lower reboiler duties, thus lower operating costs.
N-Methyldiethanolamine (MDEA) is a colorless to yellow liquid tertiary amine compound with an ammonia-like odor.
N-Methyldiethanolamine (MDEA) is completely soluble in water and a very versatile intermediate that is used in a variety of applications.
N-Methyldiethanolamine (MDEA) is heavily used as a gas-treating agent, as an intermediate for textile softeners in home care formulations and as an epoxy curing agent.
N-Methyldiethanolamine (MDEA) Chemical Properties
Melting point: -21 °C
Boiling point: 246-248 °C(lit.)
Density: 1.038 g/mL at 25 °C(lit.)
Vapor density: 4 (vs air)
Vapor pressure: 0.01 mm Hg ( 20 °C)
Refractive index: n20/D 1.469(lit.)
Fp: 260 °F
Storage temp.: Store below +30°C.
Solubility: Chloroform (Slightly), Methanol (Slightly)
Form: Liquid
pka: 14.41±0.10(Predicted)
Color: Clear colorless to light yellow
Odor: Ammonical
PH Range: 11.5 at 100 g/l at 20 °C
PH: 11.5 (100g/l, H2O, 20℃)
Explosive limit: 0.9-8.4%(V)
Water Solubility: MISCIBLE
BRN: 1734441
Stability: Stable. Combustible. Incompatible with strong oxidizing agents.
Cosmetics Ingredients Functions FILM FORMING
InChI: 1S/C5H13NO2/c1-6(2-4-7)3-5-8/h7-8H,2-5H2,1H3
InChIKey: CRVGTESFCCXCTH-UHFFFAOYSA-N
LogP: -1.16 at 23℃
Surface tension: 33.5 mN/m at 303.15K
CAS DataBase Reference: 105-59-9(CAS DataBase Reference)
NIST Chemistry Reference: N-Methyldiethanolamine (MDEA)(105-59-9)
EPA Substance Registry System: N-Methyldiethanolamine (MDEA) (105-59-9)
N-Methyldiethanolamine (MDEA) is a colorless to yellow viscous liquid with an ammonia-like odor.
N-Methyldiethanolamine (MDEA) is completely soluble in water. N-Methyldiethanolamine is an alkyl alkanolamine.
N-Methyldiethanolamine (MDEA) combines the chemical characteristics of both amines and alcohols so that it is capable of undergoing reactions typical of both alcohols and amines: forming quaternary amine salts, soaps, and esters.
Uses
N-Methyldiethanolamine (MDEA) is a reagent used for protection of boronic acids as N-methyl-O,O-diethanolamine esters.
N-Methyldiethanolamine (MDEA) is used as an intermediate in the synthesis of numerous products.
N-Methyldiethanolamine (MDEA)'s unique chemistry has resulted in its use in diverse areas, including coatings, textile lubricants, polishes, detergents, pesticides, personal-care products, pharmaceuticals, urethane catalysts, and water-treatment chemicals.
N-Methyldiethanolamine (MDEA) is also used in absorption of acidic gases, catalyst for polyurethane foams, pH control agent.
Production
N-Methyldiethanolamine (MDEA) is produced by ethoxylation of methylamine using ethylene oxide:
CH3NH2 + 2 C2H4O → CH3N(C2H4OH)2
Another route involves hydroxymethylation of diethanolamine followed by hydrogenolysis.
