Methyl diethanolamine

Methyl diethanolamine
IUPAC name Bis(2-hydroxyethyl)methylamine[citation needed]
Other names Diethanolmethylamine[citation needed] 2,2′-(Methylimino)bis-ethanol[citation needed]
Identifiers
Abbreviations	MDEA[citation needed]
CAS number	105-59-9 Y
PubChem	7767
ChemSpider	7479 Y
EC number	203-312-7
MeSH	N-methyldiethanolamine
RTECS number	KL7525000
Beilstein Reference	1734441
Jmol-3D images	Image 1
SMILES CN(CCO)CCO
InChI InChI=1S/C5H13NO2/c1-6(2-4-7)3-5-8/h7-8H,2-5H2,1H3 Y Key: CRVGTESFCCXCTH-UHFFFAOYSA-N Y
Properties
Molecular formula	C5H13NO2
Molar mass	119.16 g mol−1
Exact mass	119.094628665 g mol−1
Appearance	Colorless, transparent liquid
Odor	Ammoniacal
Density	1.038 g mL−1
Melting point	-21 °C, 252.15 K, -6 °F
Boiling point	247 °C, 520.2 K, 477 °F
Solubility in water	Miscible
Vapor pressure	1 Pa (at 20 °C)
Refractive index (nD)	1.4694
Viscosity	101 mPa s (at 20°C)
Pharmacology
Routes of administration	Oral
Hazards
GHS pictograms
GHS signal word	WARNING
GHS hazard statements	H319
GHS precautionary statements	P305+351+338
EU Index	603-079-00-5
EU classification	Xi
R-phrases	R36
S-phrases	(S2), S24
NFPA 704	1 1 0
Flash point	127 °C
Autoignition temperature	410 °C
Explosive limits	1.4-8.8%
LD50	1.945 g kg−1 (oral, rat)
Related compounds
Related alkanols	N-Methylethanolamine Dimethylethanolamine Diethylethanolamine Diethanolamine N,N-Diisopropylaminoethanol Triethanolamine Bis-tris methane
Related compounds	Diethylamine Triethylamine Diethylhydroxylamine Diisopropylamine Dimethylaminopropylamine Diethylenetriamine N,N-Diisopropylethylamine Triisopropylamine Tris(2-aminoethyl)amine Mechlorethamine HN1 (nitrogen mustard) HN3 (nitrogen mustard) Agmatine
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Methyl diethanolamine is a clear, colorless or pale yellow liquid with an ammonia odour. It is miscible with water, alcohol and benzene. Methyl diethanolamine is also known as N-Methyl diethanolamine and more commonly as MDEA. It has the formula CH₃N (C₂H₄OH)₂. MDEA is a tertiary amine and is widely used as a sweetening agent in chemical, oil refinery, syngas production and natural gas. This compound should not be confused with the similarly named commercial drug MDEA.

MDEA's popularity as a solvent for gas treating stems from several advantages it has over other alkanolamines, especially its ability to preferentially remove H₂S (and slip CO₂) from sour gas streams.

Similar compounds are monoethanolamine (MEA), a primary amine, and diethanolamine (DEA), a secondary amine, both of which are also used for amine gas treating.

See also

• Amine gas treating

References

• The GPSA Databook