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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;N-METHYLDIETHANOLAMINE;105-59-9;Bis(hydroxyethyl)methylamine;Methyldiethanolamine;Methyl diethanolamine;Ethanol, 2,2'-(methylimino)bis-;2,2'-(Methylimino)diethanol;591248-66-7;N-Methylaminodiglycol;N-Methyldiethanolimine;N-Methyliminodiethanol;2,2'-Methyliminodiethanol;N-Methyl-2,2'-iminodiethanol;2-[2-hydroxyethyl(methyl)amino]ethanol;USAF DO-52;N-methyl diethanolamine;N,N-Bis(2-hydroxyethyl)methylamine;Bis(2-hydroxyethyl)methylamine;Methylbis(2-hydroxyethyl)amine;Diethanolmethylamine;Methyliminodiethanol;Bis(2-hydroxyethyl) methyl amine;Ethanol, 2,2'-(methylimino)di-;NSC 11690;CCRIS 4843;N,N-Di(2-hydroxyethyl)-N-methylamine;2-(N-2-Hydroxyethyl-N-methylamino)ethanol;EINECS 203-312-7;UNII-3IG3K131QJ;BRN 1734441;N-Methylimino-2,2'-diethanol;DTXSID8025591;HSDB 6804;n-methyl-diethanol amine;AMINO ALCOHOL MDA;NSC-11690;N-Methyl-2,2-iminodiethanol;3IG3K131QJ;DTXCID605591;METHYLDIETHANOLAMINE, N-;2-[(2-hydroxyethyl)(methyl)amino]ethan-1-ol;EC 203-312-7;4-04-00-01517 (Beilstein Handbook Reference);N-METHYLDIETHANOLAMINE [HSDB];N-(2-Hydroxyethyl)-N-methylethanolam;n-methyl-n,n-bis(2-hydroxyethyl)amine;2,2'-(METHYLIMINO)BIS(ETHANOL);Ethanol,2'-(methylimino)di-;Ethanol,2'-(methylimino)bis-;WLN: Q2N1 & 2Q;N-methyl-diethanolamine;bis-(Hydroxyethyl)methylamine;methyldiethanolamin;MDEA amine;Mdea (diol);NMethylaminodiglycol;Amietol M12;N-Methyldethanolamne;n-methyldiethanolamin;NMethyldiethanolimine;NMethyliminodiethanol;methyl diethanol amine;N-methyl diethanol-amine;2,2'Methyliminodiethanol;di(hydroxyethyl)methylamine;NMethyl2,2'iminodiethanol;2,2'(Methylimino)diethanol;2-Hydroxy-1-[(2-hydroxyethyl)methylamino]-ethyl;SCHEMBL17605;2,2`(Methylimino)bisethanol;Bis(2hydroxyethyl)methylamine;Methylbis(2hydroxyethyl)amine;N-Methyldiethanolamine, 99%;NMethylbis(2hydroxyethyl)amine;Ethanol, 2,2'(methylimino)di;Bis(2hydroxyethyl) methyl amine;2,2`-(Methylimino)bis-ethanol;CHEMBL3185149;Ethanol, 2,2'(methylimino)bis;N-Methyldiethanolamine, >=99%;2,2'-(methylazanediyl)diethanol;N,NBis(2hydroxyethyl)methylamine;N,NDi(2hydroxyethyl)Nmethylamine;N(2hydroxyethyl)Nmethylethanolamine;NSC11690;NSC49131;NSC51500;2(N2HydroxyethylNmethylamino)ethanol;METHYL DIETHANOLAMINE [INCI];Tox21_201199;MFCD00002848;NSC-49131;NSC-51500;STL281951;2,2'-METHYLIMINODIETHANOLAMINE;AKOS009031354;N,N-bis-(2-hydroxyethyl)-methylamine;AT34020;N-METHYLBIS(2-HYDROXYETHYL)AMINE;NCGC00248955-01;NCGC00258751-01;CAS-105-59-9;LS-13102;2-[(2-hydroxy-ethyl)methyl-amino]-ethanol;DB-297071;M0505;NS00004394;N-(2-HYDROXYETHYL)-N-METHYLETHANOLAMINE;2,2'-(METHYLAZANEDIYL)BIS(ETHAN-1-OL);ethane, 1-hydroxy-2-(2-hydroxyethylmethyl)amino-;Q252344;J-523676;ethane, 1-hydroxy-2-(2-hydroxyethyl-N-methyl)amino-;N-Methyldiethanolamine 1000 microg/mL in Ammonium Hydroxide
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 monoethanolamine (MEA), 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) 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)
pka: 14.41±0.10(Predicted)
Form: Liquid
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.
InChIKey: CRVGTESFCCXCTH-UHFFFAOYSA-N
LogP: -1.16 at 23℃
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 (MDEA) 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.
N-Methyldiethanolamine (MDEA) is a new solvent with excellent performance for selective desulfurization and decarburization.
N-Methyldiethanolamine (MDEA) has the advantages of high selectivity, less solvent consumption, remarkable energy saving effect, and not easy to degrade.
Widely used in oil gas and gas desulfurization purification emulsifier and acid gas absorbent, acid-base control agent, polyurethane foam catalyst.
The carbon dioxide in synthetic ammonia can be removed with the participation of an activator, so that N-Methyldiethanolamine (MDEA) has been gradually promoted in the absorption of carbon dioxide in flue gas in recent years.
In addition, N-Methyldiethanolamine (MDEA) can also be used as pesticides, emulsifiers, semi-finished products of fabric additives, intermediates of antineoplastic drug hydrochloric acid nitrogen mustard, catalyst of carbamate coatings, it is also a drying accelerator for paint.
Preparation Method
Ethylene oxide is reacted with methylamine at a temperature of 100 ° C.
To 170 ° C.
And a pressure of 0588 MPA to 9.8066MPA, followed by distillation and rectification to obtain a finished N-methyldiethanolamine.
In addition, formaldehyde and cyanoethanol as raw materials, through catalytic hydrogenation, or formaldehyde and diethanolamine can be obtained N-Methyldiethanolamine (MDEA).
Reactivity Profile
N-Methyldiethanolamine (MDEA) is an aminoalcohol.
Amines are chemical bases.
They neutralize acids to form salts plus water.
These acid-base reactions are exothermic.
The amount of heat that is evolved per mole of amine in a neutralization is largely independent of the strength of the amine as a base.
Amines may be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides.
Flammable gaseous hydrogen is generated by amines in combination with strong reducing agents, such as hydrides.
N-Methyldiethanolamine (MDEA) may react with oxidizing materials.
