High-acid and high-salt corrosion inhibitor for low-temperature part of oil refining unit

Abstract

The invention discloses a high-acid and high-salt corrosion inhibitor for a low-temperature part of an oil refining unit. The high-acid and high-salt corrosion inhibitor for the low-temperature part of the oil refining unit comprises oleic acid, diethylenetriamine, dimethyl sulfate, xylene, 10-50 parts by weight of alkynol, 10-50 parts by weight of quaternary ammonium salt and 5-10 parts by weightof a heterocyclic compound. The alkynol is selected from butynol, hexynol, propargyl alcohol, 1,4-butynediol, methylparafynol, methylbutynol, butynediol, and 4-trimethylsilyl-3-butynol. The quaternary ammonium salt is selected from dodecyl dimethyl benzyl ammonium chloride, benzyl dimethyl dodecyl ammonium bromide, triphenyl cyclo-imidazoline quaternary ammonium salt, (4-vinyl)-benzyl chloroquinequaternary ammonium salt, (4-vinyl)-benzyl chloropyridine quaternary ammonium salt, epoxypropane chloroquine, epoxypropane chloropyridine, allyl chloroquine and allyl chloropyridine. The heterocycliccompound is selected from hexadecylpyridinium bromide, hexadecylpyridinium chloride, dodecylpyridinium hloride, and decylpyridinium romide. The corrosion inhibitor is prepared.

Description

technical field [0001] The invention relates to the technical field of oil refinery corrosion inhibitors, in particular to a high-acid and high-salt anticorrosion corrosion inhibitor suitable for low-temperature parts of oil refineries. Background technique [0002] Oil refining generally refers to petroleum refining, which is to separate petroleum through distillation to produce kerosene, gasoline, diesel and other fuel oils suitable for internal combustion engines. The by-products are petroleum gas and residual oil, which are heavier than fuel oil. Cracking, catalytic cracking and other processes are chemically converted into fuel oil, and some of these fuel oils are refined by hydrogenation and other processes. The heaviest vacuum residue is produced through solvent deasphalting process to produce deasphalted oil and petroleum pitch, or through delayed coking process to crack heavy oil into fuel oil components and by-product petroleum coke. Lubricating oil refineries pro...

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Problems solved by technology

[0004] Oil refining corrosion inhibitors are indispensable in industrial oil refining. However, the oil refining corrosion inhibitors in the prior art have a single component and cannot achieve multi-level protection. The present invention mainly aims at the shortcomings of the prior art. Developed a high-acid and high-salt corrosion inhibitor suitable for low-temperature parts of oil refineries