METHYL DIETHANOLAMINE- ▸ Gas treating: Selective absorbent for hydrogen sulfide and carbon dioxide
- ▸ Chemical intermediate: Feedstock for cationic surfactants and amine derivatives
- ▸ Polyurethane: Catalyst for polyurethane foam systems
- ▸ pH control: Acid-gas neutralizing and pH-adjusting agent
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Methyldiethanolamine (CAS 105-59-9) is a tertiary alkanolamine. It is used to absorb acidic gases such as hydrogen sulfide and carbon dioxide in gas treating and refining, as a chemical intermediate including for cationic surfactants, as a catalyst for polyurethane foams, and as a pH-control agent.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 203-312-7
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Amines & Antifoams for Reliable Gas Sweetening (Oil, Gas & Mining)
Frequently Asked Questions
What is methyldiethanolamine used for?
MDEA (CAS 105-59-9) is a tertiary alkanolamine used to absorb acidic gases such as hydrogen sulfide and carbon dioxide in gas treating and refining, as a chemical intermediate (including for cationic surfactants), as a polyurethane-foam catalyst, and as a pH-control agent. RawSource supplies it in bulk for gas treating and synthesis.
What is MDEA used for in a refinery?
In refineries and gas plants, MDEA is used as a selective absorbent to remove hydrogen sulfide (H2S) and carbon dioxide (CO2) from gas streams. Its tertiary-amine structure allows selective H2S pickup over CO2, which is valued in sour-gas treating and tail-gas units.
Is methyldiethanolamine an amine or an alcohol?
It is both – an alkanolamine. MDEA is a tertiary amine bearing two hydroxyethyl (alcohol) groups and one methyl group, formula C5H13NO2, which is why it functions in both acid-gas absorption and pH control.
What CAS number and HS code apply to MDEA?
CAS 105-59-9; HS code 2922.17 (amino-alcohols, their ethers and esters: methyldiethanolamine and ethyldiethanolamine).
What is the cost of bulk methyldiethanolamine?
Bulk MDEA pricing depends on volume, packaging (drums, totes, or bulk), and freight. Request a bulk quote from RawSource with your target quantity and delivery location for current pricing and lead time.
What is the REACH and TSCA regulatory status of Methyldiethanolamine (MDEA)?
Methyldiethanolamine (MDEA) (CAS 105-59-9) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 203-312-7).