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Monoethanolamine (MEA)

CAS Number: 141‑43‑5

Synonyms: Monoethanolamine; 2‑aminoethanol; Ethanolamine; MEA

Chemical Formula: C₂H₇NO (HO–CH₂–CH₂–NH₂)

Molecular Weight: 61.08 g/mol

Product Introduction

A clear, colorless, hygroscopic liquid with a mild ammonia-like odor. Contains both amine and alcohol functional groups, offering unique versatility. Widely used in gas treatment (CO₂/H₂S scrubbing), surfactants, detergents, metalworking, corrosion inhibition, wood and textile treatment, coatings, and carbon capture systems.

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Physical & Chemical Properties

Property	Value (≈40 % in H₂O)
Appearance	Colorless viscous liquid
Odor	Ammonia-like
Density @ 20 °C	~1.011 g/cm³
Melting Point	~10.3 °C
Boiling Point	~170 °C
Vapor Pressure @ 20 °C	<1 mm Hg (~64 Pa)
Refractive Index (n₂₀ᴅ)	~1.4539
Flash Point	~85 °C cc
pKₐ	~9.5
Solubility	Miscible with water, alcohols, polyols
Vapor Density	~2.1 × air

Applications

Detergents & Surfactants: Ingredient in household and industrial cleaners and cosmetics
Corrosion Inhibitor / Metalworking Fluids: Used in industrial machining and cooling applications
Wood & Textile Treatment: Component of preservatives and finishing agents
Carbon Capture: Emerging use in CCS (Carbon Capture and Storage) technologies

Safety & Handling

Corrosive; irritating to skin, eyes, and respiratory system. OSHA PEL/TLV: 3 ppm TWA. Store sealed, cool, in corrosion-resistant containers using PPE and good ventilation.