N,N-Dimethyloctylamine (DMA8) CAS 7378-99-6

Introduction to DMA8

N,N-Dimethyloctylamine is built on a straight eight-carbon alkyl chain bonded to a dimethylamino tertiary nitrogen group. The structure balances moderate hydrophobicity with high amine reactivity, supporting good solubility in both organic systems and aqueous dispersions. It appears as a colorless to pale yellow liquid at room temperature, with a characteristic fishy amine odor. It is slightly soluble in water and fully miscible with alcohols, ethers and most non-polar organic solvents.

Industrial production uses controlled alkylation and fractional distillation to achieve target purity and consistent amine value. The compound readily absorbs atmospheric carbon dioxide to form carbamate salts, which cause liquid turbidity and reduce active amine content over open storage.

DMA8 Chemical & Physical Properties

Applications of DMA8

Quaternary ammonium biocides: Reacts with benzyl chloride to produce octyl dimethyl benzyl ammonium chloride, a low-foaming cationic biocide used in industrial water treatment, hard surface disinfection and cooling tower slime control.

Polyurethane foam catalysts: Acts as a gelling co-catalyst in flexible and rigid polyurethane foam systems. It balances blowing and gel reactions to optimize cell structure and curing rate in foam formulations.

Emulsifier and surfactant intermediates: Oxidizes to form octyl dimethyl amine oxide, a foam booster and hydrotrope for industrial cleaners. It also serves as a precursor for amphoteric surfactants used in agrochemical formulations.

Oilfield corrosion inhibitors: Serves as an intermediate for filming amine corrosion inhibitors. The alkyl chain adsorbs onto steel pipe surfaces, forming a protective barrier against acidic brines and downhole corrosion.

Storage & Safety Precautions for DMA8

• Store in tightly sealed containers, preferably under nitrogen blanketing. Air exposure causes carbon dioxide absorption and carbamate formation, leading to turbidity and reduced active amine content.
• Use stainless steel or HDPE equipment for storage and transfer. The amine corrodes copper, brass and zinc alloys, causing product contamination and equipment damage.
• Handle as a flammable and corrosive liquid. Wear chemical splash goggles, nitrile gloves and chemical-resistant clothing during bulk transfer. Work in well-ventilated areas to avoid vapor inhalation.

DMA8 FAQ

Q: What is N,N-Dimethyloctylamine (DMA8) used for in biocide production?

A: It reacts into octyl benzalkonium chloride, a low-foaming cationic biocide for industrial water treatment and surface disinfection.

Q: Why does DMA8 require sealed storage?

A: It absorbs atmospheric CO₂ to form carbamate salts, causing turbidity and reduced active amine value. Store sealed under nitrogen.

Q: Is DMA8 a liquid at room temperature?

A: Yes, it is a colorless to pale yellow liquid with good flowability, easy to blend into formulations.