US 10,889,748 B2
Process for preparing dibenzylamine quaternary ammonium salt high-temperature resistant corrosion inhibitor and applications thereof
Yongming Li, Sichuan (CN); Dingli Wang, Sichuan (CN); Youshi Jiang, Sichuan (CN); Xiyu Chen, Sichuan (CN); and Juhui Zhu, Sichuan (CN)
Assigned to SOUTHWEST PETROLEUM UNIVERSITY, Sichuan (CN)
Appl. No. 16/622,673
Filed by Southwest Petroleum University, Sichuan (CN)
PCT Filed Nov. 20, 2018, PCT No. PCT/CN2018/116451
§ 371(c)(1), (2) Date Dec. 13, 2019,
PCT Pub. No. WO2020/082476, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 2018 1 1240768 (CN), filed on Oct. 23, 2018.
Prior Publication US 2020/0339865 A1, Oct. 29, 2020
Int. Cl. C09K 8/54 (2006.01); C07C 209/84 (2006.01); C23F 11/14 (2006.01); E21B 41/02 (2006.01)
CPC C09K 8/54 (2013.01) [C07C 209/84 (2013.01); C23F 11/143 (2013.01); E21B 41/02 (2013.01); C09K 2208/32 (2013.01)] 9 Claims
 
1. A process for preparing a dibenzylamine quaternary ammonium salt high-temperature resistant corrosion inhibitor, comprising the following steps in sequence:
(1) dissolve amine reagents selected from the group consisting of 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 a reduced pressure, and wash to obtain an intermediate I;
(2) dissolve the intermediate I in an organic solvent, add dibenzylamine, then add an acid binding agent, warm to 60-80° 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, then warm to 80-110° 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 dibenzylamine quaternary ammonium salt high-temperature resistant corrosion inhibitor.