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Methyldiethanolamine (MDEA) is a new solvent with excellent performance for selective desulfurization and decarburization.
Methyldiethanolamine (MDEA) has the advantages of high selectivity, less solvent consumption, remarkable energy saving effect, and not easy to degrade.
Methyldiethanolamine (MDEA) widely used in oil gas and gas desulfurization purification emulsifier and acid gas absorbent, acid-base control agent, polyurethane foam catalyst.
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
The carbon dioxide in synthetic ammonia can be removed with the participation of an activator, so that Methyldiethanolamine (MDEA) has been gradually promoted in the absorption of carbon dioxide in flue gas in recent years.
In addition, 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.
Methyldiethanolamine, also known as N-methyl diethanolamine and more commonly as Methyldiethanolamine (MDEA), is the organic compound with the formula CH3N(C2H4OH)2.
Methyldiethanolamine (MDEA) is a colorless liquid with an ammonia odor.
Methyldiethanolamine (MDEA) is miscible with water, ethanol and benzene.
A tertiary amine, Methyldiethanolamine (MDEA) is widely used as a sweetening agent in chemical, oil refinery, syngas production and natural gas.
Similar compounds are Methyldiethanolamine (MDEA), a primary amine, and diethanolamine (DEA), a secondary amine, both of which are also used for amine gas treating.
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.
Methyldiethanolamine (MDEA) is a colorless to yellow liquid tertiary amine compound with an ammonia-like odor.
Methyldiethanolamine (MDEA) is completely soluble in water and a very versatile intermediate that is used in a variety of applications.
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.
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: Methyldiethanolamine (MDEA)(105-59-9)
EPA Substance Registry System: Methyldiethanolamine (MDEA) (105-59-9)
Methyldiethanolamine (MDEA) is a colorless to yellow viscous liquid with an ammonia-like odor.
Methyldiethanolamine (MDEA) is completely soluble in water.
Methyldiethanolamine (MDEA) is an alkyl alkanolamine.
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
Methyldiethanolamine (MDEA) is used as an intermediate in the synthesis of numerous products.
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.
Methyldiethanolamine (MDEA) is also used in absorption of acidic gases, catalyst for polyurethane foams, pH control agent.
Methyldiethanolamine (MDEA) is a reagent used for protection of boronic acids as N-methyl-O,O-diethanolamine esters.
MDEA blends
Methyldiethanolamine (MDEA) is less reactive towards CO2, but has an equilibrium loading capacity approaching 1 mole CO2 per mole amine.
Methyldiethanolamine (MDEA) also requires less energy to regenerate.
To combine the advantages of Methyldiethanolamine (MDEA) and the smaller amines, MDEA is usually mixed with a catalytic promoter such as piperazine, PZ, or a fast reacting amine such as MEA to retain reactivity, but lower regeneration costs.
Activated Methyldiethanolamine (MDEA) or aMDEA uses piperazine as a catalyst to increase the speed of the reaction with CO2.
Methyldiethanolamine (MDEA) has been commercially successful.
Many tests have been done on the performance of MDEA/MEA or MDEA/piperazine mixtures compared to single amines.
CO2 production rates were higher than Methyldiethanolamine (MDEA) for the same heat duty and total molar concentration when experiments were performed in the University of Regina pilot plant, which is a modeled after a natural gas plant.
There were also insignificant trace amounts of degradation products detected.
However, when the same control variables and tests were conducted at the Boundary Dam Power Station plant, the CO2 production rate for the mixed solvent was lower than Methyldiethanolamine (MDEA).
This was a result of the reduction in the capacity of the solvent to absorb CO2 after degradation.
Because the Boundary Dam plant is a coal-fired power plant, it operates under harsher environments and produces an impure flue gas containing, fly ash, SO2, and NO2 that are fed into carbon capture.
Even with flue gas pretreatment, there is still enough to produce degradation products such as straight chain amines and sulfur compounds, which accumulate so it is no longer possible to regenerate MEA and Methyldiethanolamine (MDEA).
For these blends to be successful in reducing heat duty, their chemical stabilities must be maintained.
Degradation
Main oxidative degradation products of Methyldiethanolamine (MDEA) include monoethanol amine (MEA), methyl-aminoethanol (MAE), diethanolamine (DEA), amino acids bicine, glycine and hydroxyethyl sarcosine (HES), formyl amides of MAE and DEA, ammonia, and stable salts formate, glycolate, acetate, and oxalate.
In an industrial plan that utilizes Methyldiethanolamine (MDEA), oxidative degradation is most likely to shift to the cross exchanger where temperatures are greater than 70 °C.
Higher temperatures and higher CO2 loading accelerate the rate of degradation, resulting in an increase of alkalinity loss as well as total formate production.
While MDEA is more resistant to degradation as a standalone compared to MEA, Methyldiethanolamine (MDEA) is preferentially degraded when in an Methyldiethanolamine (MDEA)/MEA blend.
Because of the formation of DEA and MAE, which could form nitroso-compounds or diethylnitrosamine and diethylnitraine, the blend could potentially have an adverse impact in terms of atmospheric admissions.
In the Boundary Dam plant, emissions increased when CO2 loading of lean amine increased for the blend and MEA.
However, decreasing the lean loading increases the reboiler heat duty, which results in an obvious tradeoff between emissions and heat duty or energy costs.
This compound should not be confused with the recreational drug methylenedioxyethylamphetamine which is also abbreviated Methyldiethanolamine (MDEA).
Production
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.
