CAS 111-42-2|C₄H₁₁NO₂

Diethanolamine (DEA)

Secondary alkanolamine for acid gas scrubbing, surfactant production, metalworking fluids, and cement grinding aids.

Flash Point

137 °C (279 °F)

Boiling Point

268.8 °C

Melting Point

28 °C (solid below)

Packaging

Drum / Tote / Bulk

Physical Properties

Molecular FormulaC₄H₁₁NO₂
Molecular Weight105.14 g/mol
CAS Number111-42-2
Boiling Point268.8 °C (515.8 °F)
Melting Point28 °C (82 °F)
Flash Point137 °C (279 °F)
Density1.097 g/cm³ at 20 °C
Vapor Pressure<0.01 kPa at 20 °C
Solubility in WaterMiscible in all proportions
pH (10% solution)~11.0
Viscosity351 mPa·s at 30 °C
Auto-ignition Temp.365 °C (689 °F)
Diethanolamine (DEA)HOCH₂CH₂NHCH₂CH₂OHC₄H₁₁NO₂ | MW 105.14 g/mol

Grades & Packaging

IndustrialTechnical Grade
55-gal Drums275-gal TotesBulk Tanker

Industrial Applications

Gas Treating

Acid gas scrubbing to remove H₂S and CO₂ from natural gas, refinery gas, and syngas streams. Used in amine treating units.

Surfactant Production

Feedstock for diethanolamide surfactants (DEA-based cocamide DEA) used in shampoos, detergents, and industrial cleaners.

Metalworking Fluids

Corrosion inhibitor and pH buffer in water-based metalworking fluids, cutting oils, and grinding fluids.

Cement & Concrete

Grinding aid and strength-enhancing additive in Portland cement production.

Chemical Synthesis

Intermediate for morpholine, ethyleneamines, and specialty chemicals. Reacts with fatty acids to form alkanolamides.

Textile Processing

Softening agent and pH adjuster in textile finishing and dyeing operations.

Safety & Regulatory

NFPA Health2 — Moderate hazard
NFPA Flammability1 — Slight hazard
NFPA Reactivity0 — Stable
OSHA PEL (TWA)3 ppm (AIHA WEEL)
ACGIH TLV (TWA)1 mg/m³
DOT Hazard ClassNot regulated (flash pt >60 °C)
UN NumberNot assigned
Packing GroupN/A

SDS and certificate of analysis available upon request. Note: DEA is a solid below 28 °C — heated storage and transfer equipment may be required.

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DEA vs. Alternatives

Diethanolamine (DEA) is a versatile alkanolamine used as a gas treating solvent, surfactant intermediate, and pH adjuster. Here's how it compares to related alkanolamines.

AttributeDEAMEA (Monoethanolamine)TEA (Triethanolamine)
Chemical ClassSecondary alkanolaminePrimary alkanolamineTertiary alkanolamine
CO2/H2S AbsorptionGood — moderate reactivity, lower degradationExcellent — highest reactivity, more degradationSelective for H2S — lower CO2 pickup
Vapor PressureVery low — less stripping lossLow — some stripping lossVery low — similar to DEA
ViscosityModerate — 351 cP at 20 °CLow — 24 cP at 20 °CHigh — 613 cP at 20 °C
Primary UseGas treating, surfactant intermediate, cosmeticsGas treating, cement, personal careCosmetics, cement, metalworking fluids

Industries We Supply DEA To

Natural Gas Processing

DEA is used in amine gas treating units to selectively absorb CO2 and H2S from natural gas streams, producing pipeline-quality gas and meeting sulfur recovery feed specifications.

DEA supply in Houston, TX

Personal Care & Cosmetics

Used as a pH adjuster, emulsifier, and foam booster in shampoos, conditioners, lotions, and liquid soaps — reacts with fatty acids to form DEA-based surfactants.

DEA supply in Dallas, TX

Metalworking Fluids

DEA is a component of water-soluble metalworking fluids and cutting oils, providing corrosion inhibition, pH buffering, and emulsification for machining operations.

DEA supply in Beaumont, TX

Textile & Fiber Processing

Used as a softening agent, lubricant, and antistatic additive in textile finishing and fiber processing operations.

DEA supply in San Antonio, TX