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N-MethyldiethanolaMine

Name: N-MethyldiethanolaMine
SKU: 0

Basic Information

CAS No.: 105-59-9
Molecular Formula: C5H13NO2
Molecular Weight: 119.16

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Product Details

N‑Methyldiethanolamine, commonly abbreviated as MDEA, is a colorless or pale yellow viscous liquid with a mild amine odor. It is a tertiary alkanolamine widely used in gas treatment, chemical synthesis, and industrial processing.

Chemical Properties

Property	Value
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.)
Flash point	260 °F
Storage condition	Store below +30°C.
Solubility	Soluble in chloroform (slightly), methanol (slightly)
Acid dissociation constant (pKa)	14.41±0.10 (Predicted)
Form	Liquid
Color	Clear colorless to pale yellow
Odor	Ammonia-like
pH value	11.5 (100g/l, H₂O, 20°C)
pH range (indicator)	11.5 at 100 g/l at 20 °C
Explosive limit	0.9-8.4%(V)
Water solubility	MISCIBLE
BRN	1734441
Stability	Stable. Combustible. Incompatible with strong oxidizing agents.
Cosmetic ingredient function	FILM FORMING
InChI	1S/C5H13NO2/c1-6(2-4-7)3-5-8/h7-8H,2-5H2,1H3
InChIKey	CRVGTSFCCXCTH-UHFFFAOYSA-N
SMILES	N(CO)(CO)C(C)O
LogP	-1.16 at 23°C
Surface tension	33.5 mN/m at 303.15K
CAS database	105-59-9 (CAS DataBase Reference)
NIST chemical substance information	Methyldiethanolamine (105-59-9)
EPA chemical substance information	N-Methyldiethanolamine (105-59-9)

Safety Information

Property	Value
Hazard symbol	Xi
Hazard class code	36
Safety description	24
UN dangerous goods number	2735
WGK Germany	1
RTECS number	KL7525000
Autoignition temperature	770 °F
TSCA	TSCA listed
HS code	2922 17 00
Hazard class	8
Packing group	II
Storage class	10 - Combustible liquids
Hazard class (category)	Eye irritation, Category 2
Hazardous substances data	105-59-9 (Hazardous Substances Data)
Toxicity	LD50 orally in Rabbit: 4680 mg/kg

Product Usage

N-MethyldiethanolaMine is an important organic amine compound with wide industrial applications. In natural gas and refinery gas purification, it serves as a selective acid gas removal agent, efficiently absorbing hydrogen sulfide while minimizing co-absorption of carbon dioxide, thereby reducing energy consumption. In the coatings and polyurethane industries, it acts as a neutralizing agent and catalyst, used for pH adjustment in water-based coatings and for rigid foam production. Additionally, it is used as an intermediate in textile and pharmaceutical synthesis, as well as in flue gas desulfurization and as a rust inhibitor additive in metalworking fluids.

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