[Bite Chemical] Synthesis and usage industry scope of octadecyldimethyltertiary amine

Octadecyldimethyltertiary amine is a colorless or light yellow transparent liquid, soluble in alcohol but insoluble in water.

1. The synthesis method of octadecyldimethyltertiary amine is as follows:

(1) Condensation of octadecylamine, formaldehyde and formic acid be made of. First add octadecylamine into the reactor, stir evenly in the ethanol medium, control the temperature at 50-60°C, add formic acid, stir for a few minutes, add formaldehyde at 60-65°C, raise the temperature to 80-83°C, and reflux for 2 hours. , neutralize with liquid alkali to make the pH value greater than 10, let it stand for layering, remove water, distill under reduced pressure to remove ethanol, and then cool it to obtain N, N-dimethyloctadecylamine. Raw material consumption quota: octadecylamine (industrial product) 917k/t, ethanol (95%) 417kg/t, formic acid 510kg/t, formaldehyde (37%) 546kg/t.

(2) There is also a method of directly synthesizing higher alcohols and dimethylamine. Use stearyl alcohol and dimethylamine in the presence of a catalyst to perform catalytic amination in the liquid phase at 180-220°C to remove a molecule of water to obtain crude tertiary amine, which can be distilled under reduced pressure to obtain high-purity N, N -Dimethyloctadecylamine. Each ton of product consumes 971kg of stearyl alcohol and 170kg of dimethylamine.

2. Octadecyldimethyl tertiary amine can be used in the following industries:

(1) This product can be used to produce dimethyl amine Surfactant products, and their downstream products mainly play a bactericidal role. Downstream products can also be used as leveling agents in the textile industry.

(2) This product can produce trimethyl series surfactants, mainly used in the daily chemical industry.

(3) This product can be used to manufacture the amphoteric surfactant betaine, and the product has important applications in oil fields and other industries.

(4) This product is used as the main raw material for the surfactant ammonium oxide series produced. The foaming effect of downstream products is remarkable, and it is an important additive material in the daily chemical industry.

(5) This product can also be used in products such as fabric softening, antistatic agent, and improving hair combability. Can be used to produce insect repellents. N,N-dimethyloctadecylamine reacts with ethylene oxide and nitric acid to produce octadecyldimethylhydroxyethyl quaternary ammonium nitrate, which is the antistatic agent SN.