Southwest Petroleum University

Dingli Wang

Yongming Li

Xiyu Chen

Youshi Jiang

Juhui Zhu

The present invention discloses a process for preparing a Mannich base quaternary ammonium salt high-temperature resistant corrosion inhibitor and applications thereof. The preparation process comprises the following steps: (1) dissolve an amine substance indole, benzhydrylpiperidine, diphenylethylamine, dibenzylamine or diisopropanolamine into an organic solvent, slowly add an aldehyde substance 3-(2-thienyl)benzaldehyde or cinnamaldehyde, then place in a constant-temperature water bath, stir to react at 60-80&#xb0; C. for 1 to 3 hours, then add a ketone substance benzalacetone, diphenylstyryl acetone or 1,1-diphenylacetone, adjust the reaction system pH to 3 to 4 using a hydrochloric acid solution, and then react for 7 to 10 hours; after cooled to room temperature, perform distillation under a reduced pressure to remove the solvent, to obtain a Mannich base; (2) dissolve the Mannich base in an organic solvent, add quaternizing reagent chloromethylnaphthalene, benzyl chloride or triphenylchloromethane, then react at 70-90&#xb0; C. for 14-16 h, after cooled to room temperature, perform distillation under a reduced pressure. The process is simple and feasible, and its raw material is non-toxic, safe and environmental-friendly, and the prepared corrosion inhibitor has obvious resistance to the acid corrosion of carbon steels in oil-gas wells.

Process for preparing Mannich base quaternary ammonium salt high-temperature resistant corrosion inhibitor and applications thereof

The present invention discloses a process for preparing a dibenzylaminquaternary ammonium salt high-temperature resistant corrosion inhibitor and applications thereof. The preparation process comprises the following steps: (1) Dissolve the amine reagents benzylamine, phenethylamine, morpholine or indole in an organic solvent, slowly add epichlorohydrin dropwise, stir to react at a room temperature for 12-14 hours, and then distill under reduced pressure, and wash to obtain an intermediate I; (2) Dissolve the intermediate I in an organic solvent, add dibenzylamine at a ratio, then add an acid binding agent, warm to 60-80&#xb0; C. to react for 14 to 16 hours, after cooling to room temperature, perform filtration, extraction and distillation under a reduced pressure to obtain an intermediate II; (3) Dissolve the intermediate II in an organic solvent, add quaternizing reagent at a ratio, then warm to 80-110&#xb0; C. to react for 12 to 15 hours, after cooling to room temperature, perform filtration, extraction and distillation under a reduced pressure to obtain the dibenzylaminquaternary ammonium salt high-temperature resistant corrosion inhibitor. The process is simple and feasible, and its principle is reliable, and the prepared corrosion inhibitor has good resistance to the acid corrosion of carbon steels in oil-gas wells.

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Sichuan, China

Dingli Wang