Metal corrosion inhibitor and preparation method thereof
A metal corrosion inhibitor and corrosion inhibitor technology, applied in the direction of organic chemistry, can solve the problem of not seeing CO2 gas-liquid two-phase corrosion inhibitor, so as to reduce the wetting angle, improve the utilization rate, strength and compactness Improved effect
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[0037]Example one
[0038]Preparation of 2-ethylthioazamine ethylbenzyl-1-heptadecenyl imidazoline quaternary ammonium salt
[0039]The cis-octadec-9-enoic acid and triethylenetetramine were amidated at 130°C for 1 hour at a molar ratio of 1:0.55, then cyclized at 250°C for 7 hours, and then added 2 times moles of benzyl chloride, 100℃ quaternization reaction 3h, and finally add equimolar ethyl sulfide nitrogen 100℃ to react for 1h to obtain natural gas storage CO2The liquid phase corrosion inhibitor in the gas-liquid two-phase corrosion inhibitor is 2-ethionine ethylbenzyl-1-heptadecenyl imidazoline quaternary ammonium salt.
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[0040]Example two
[0041]Preparation of 2-ethylxanthogenic amine ethylbenzyl-1-methylimidazoline quaternary ammonium salt
[0042]Acetic acid and triethylenetetraamine were amidated at 120°C for 1 hour at a molar ratio of 1:0.5, then cyclized at 220°C for 6 hours, and then 2 times moles of benzyl chloride were added, and quaternized at 100°C for 2.5 hours. Finally, equimolar ethyl sulfonate was added and reacted at 100°C for 1 hour to obtain the gas phase corrosion inhibitor 2-ethylsulfonate amine ethylbenzyl-1-methyl in the CO2 gas-liquid two-phase corrosion inhibitor for natural gas storage. Glyimidazoline quaternary ammonium salt.
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[0043]Example three
[0044]Determination of corrosion inhibition rate by static weight loss method (liquid phase)
[0045]Experimental temperature is 50℃, CO2 partial pressure is 0.50MPa, liquid phase salinity is 30000mg / L, CO2Liquid phase corrosion inhibitor 2-Ethylthioazinylamine ethylbenzyl-1-heptadecenyl imidazoline quaternary ammonium salt (YX), CO2Gas phase corrosion inhibitor 2-ethyl sulfonated amine ethyl benzyl-1-methylimidazoline quaternary ammonium salt (QX), sodium butyl sulfonate (DH) combined liquid phase corrosion inhibition experiment, the experimental results are shown in Table 3 .
[0046] Concentration / (mg / L) CR / (mm / a) IE / % 00.9214—— 150 / (QX) 0.256772.1 150 (YX) 0.151683.5 150 (DH) 0.491846.6 60(QX)+100(YX)+30(DH) 0.045695.1
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