Physicochemical properties and preparation method of imidazoline quaternary ammonium salt corrosion inhibitor

Imidazoline Quaternary Ammonium Salt Corrosion Inhibitor

[Physical and chemical properties] This type of corrosion inhibitor has no special pungent odor, good thermal stability, and low toxicity

[Preparation method] (1) Synthesis of imidazoline quaternary ammonium salt corrosion inhibitor

① imidazoline Synthesis of imidazoline amide is dehydrated by dehydration and cyclization further formed

②Synthesis of imidazoline quaternary ammonium salt.

The quaternization reaction of imidazoline is further carried out: when the temperature is 100-120° C.

(2) Preparation example

①Add 0.

②Li Bang used naphthenic acid with an acid value (KOH) of 190mg/g as a raw material to react with polyethylene polyamine to synthesize a cycloalkylimidazoline intermediate, and then use diethyl sulfate to quaternize the intermediate.

The best synthesis conditions are: the first step, naphthenic acid: diethylene triamine (molar ratio) = 1: (1.

③Song Sasha uses benzoic acid and triethylenetetramine as raw materials to synthesize imidazoline precursors, and modifies them with 1-chloro3-phenylpropane to prepare imidazoline quaternary ammonium salt corrosion inhibitors: combine benzoic acid and triethylenetetramine The amine was added to a 250 mL three-necked flask at a molar ratio of 1:1.

④ Zhang Guanghua prepared 2-aminoethyl heptadecenyl by reacting oleic acid (industrial product, the fraction obtained under reduced pressure 180～230℃/mmHg), diethylenetriamine and benzyl chloride in xylene solution Imidazoline quaternary ammonium salt

Put oleic acid, diethylenetriamine, xylene, and catalyst into the reaction kettle, and install a water separator to return the reactants to separate water