A kind of fluorine-containing cationic imidazoline corrosion inhibitor and preparation method thereof

Abstract

The invention provides a fluorine-containing cationic imidazoline corrosion inhibitor and a preparation method thereof. The method comprises the following steps: adding an organic carboxylic acid and diethylenetriamine into a reactor in a molar ratio of 1:(0.1-2); adding a benzene solvent, heating, and performing a reaction at the temperature of 130-165 DEG C; heating, and performing a cyclization reaction at the temperature of 190-210 DEG C; cooling to 80-110 DEG C after the cyclization reaction; dripping perfluoroalkglsulfonyl fluoride after cooling, and performing a thermostatic reaction; and dripping a quaternizing reagent after the thermostatic reaction, and performing a thermostatic reaction to prepare the fluorine-containing cationic imidazoline corrosion inhibitor. The corrosion inhibitor is a rufous sticky liquid and can be miscible with water in any proportion, wherein the flash point is more than 60 DEG C, the condensation point is less than minus 10 DEG C, and the density is between 0.86g / ml and 0.99g / ml. The fluorine-containing cationic imidazoline corrosion inhibitor has the advantages of good metal surface adsorption, easily formed oleophobic metal surface, less possibility of dropping and the like, and can be used for reducing the friction of organic media, such as crude oil, finished product oil and the like, to a vessel surface.

Description

technical field [0001] The invention relates to an imidazoline corrosion inhibitor and a preparation method thereof, in particular to a fluorine-containing cationic imidazoline corrosion inhibitor and a preparation method thereof. Background technique [0002] In recent years, imidazoline compounds are one of the fastest-growing organic corrosion inhibitors. Its molecular structure contains a nitrogen five-membered heterocycle. A monomolecular film is formed on the surface to change the oxidation-reduction potential of hydrogen ions to achieve the purpose of corrosion inhibition. [0003] At present, domestic reports on imidazoline corrosion inhibitors include: Wang Jianhua, Shu Fuchang, etc. use diethylenetriamine, triethylenetetramine, polyethylenepolyamine, oleic acid, benzyl chloride, chloroacetic acid, and absolute ethanol as raw materials. , to synthesize a series of imidazoline derivative corrosion inhibitors. Zhu Xun, Zhou Xiuqin and others synthesized cycloalkylim...

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Problems solved by technology

Although imidazoline compounds have a certain effect in preventing metal corrosion, the above-mentioned imidazoline compounds have certain shortcomings in terms of corrosion inhibition efficiency, high temperature resistance, water solubility, hydrophobicity, etc., especially for high temperature Corrosive medium and flowing medium have great adverse effects on corrosion inhibition rate, etc., resulting in the popularization and application of imidazoline corrosion inhibitors being affected

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