Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
Basic Information
Product Name: Diethanolmethylamine
CAS Number: 105-59-9
Alias: Methyl diethanolamine, MDEA, N-Methyldiethanolamine
Molecular Formula: C5H13NO2
Molecular Weight: 119.16
IUPAC Name: 2,2'-(methylimino)diethanol
Structural Information
- Structure Type: Tertiary alkanolamine
- Structural Features: One methyl group attached to nitrogen, two hydroxyethyl side chains; contains two hydroxyl groups and one tertiary amine group, selective absorption capacity for CO?/H?S, low regeneration energy consumption
Physical & Chemical Properties
- Appearance: Colorless transparent viscous liquid
- Odor: Mild ammonia-like amine odor
- Melting Point: -21 °C
- Boiling Point: 246–248 °C
- Flash Point: 127 °C (closed cup)
- Density (20℃): 1.042 g/cm3
- Solubility: Fully miscible with water, ethanol, methanol; soluble in ketones; slightly soluble in aromatic solvents, insoluble in aliphatic mineral oil
- Stability: Stable at room temperature sealed storage; reacts with acids to form salts; reacts with esters to produce transesterification; oxidizes slowly under long-term high temperature and air exposure; compatible with most polar chemicals, incompatible with strong oxidants
Synthesis & Applications
Production Method
Methylamine aqueous solution reacts with ethylene oxide under heating and pressure, rectified to remove mono- and triethanolamine impurities to obtain pure MDEA.
Main Applications
- Gas purification industry: Selective decarbonization and desulfurization solvent for natural gas, refinery gas, coal chemical syngas
- Water treatment auxiliary: Corrosion inhibitor for circulating water system
- Surfactant intermediate: Raw material for amphoteric surfactants, shampoo and detergent formulations
- Polyurethane auxiliary: Catalyst for polyurethane foam production
- Electronic chemical additive: pH regulator for circuit board cleaning liquid
Safety & Storage Instructions
GHS Hazard Classification
- H314 Causes severe skin burns and eye damage
- H335 May cause respiratory irritation
Personal Protection
Organic vapor respirator, full-face splash goggles, chemical-resistant nitrile gloves, anti-chemical protective clothing; operate in ventilated fume hood
Storage Condition
Hermetically sealed steel drum, cool ventilated warehouse ≤30℃; isolate strong acids, strong oxidants
Transportation
General weakly corrosive organic liquid; avoid open flame, high temperature and direct sunlight
Quality Specifications
- Purity: ≥99.0% (GC)
- Water content: ≤0.1%
- Chroma (Pt-Co): ≤15
- Total amine impurities: ≤0.5%
Information Summary Table
| Item | Specification |
| CAS Number | 105-59-9 |
| Product Name | Diethanolmethylamine |
| Synonym | MDEA, N-Methyldiethanolamine |
| Molecular Formula | C5H13NO2 |
| Molecular Weight | 119.16 |
| Appearance | Colorless viscous liquid with faint amine odor |
| Boiling Point | 246–248°C |
| Flash Point | 127°C |
| Solubility | Miscible with water and short-chain alcohols |
| Purity Standard | ≥99.0% |
| Storage Condition | Sealed cool ventilated storage, separate from acid and oxidants |
| Hazard Property | Corrosive, causes severe skin/eye burns, irritates respiratory tract |
| Main Usage | Gas desulfurization/decarbonization solvent, PU foam catalyst, surfactant raw material, water treatment corrosion inhibitor |
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