Corrosion inhibitor used during e.g. recovery and transport of natural gas and crude oil

摘要

Corrosion inhibitor contains: (A) 2-98 wt.% of a condensation product of diethylenetriamine or dipropylene triamine with (un)satd. 6-22C fatty acids in mol. ratio of 2-1:1-2.5, which has been partially converted into corresponding ammonium salts; and (B) 0-70 wt.% organic solvent. The novelty is that the inhibitor further contains (C) 2-98 wt.% of a condensation product, as corrosion inhibitor, of an amine mixt. of: (a) 20-70 wt.pts. N-(2-aminoethyl)ethanolamine; (b) 30-80 wt.pts. polyamines of formula: H2N-(CH2)m-NHn-H (where m = 2 or 3; and n = 3-8); and (c) 0-20 wt.pts. further aliphatic amines, with (un)satd. 6-22C fatty acids in mol. ratio of 2-1:1-2. An alternative corrosion inhibitor is also claimed.