Hydrocarbon functionalized polyamines for corrosion inhibition
Compositions and methods are provided for reducing, inhibiting, or preventing corrosion of a surface, the polyamine compounds corresponding to the structure of Formula 1 or 2, or a salt thereof: wherein X 1 is —C(O)R 9 or —[C(R 10 R 11 )] p —C(R 12 )(X 2 )—R 13 ; X 2 is —OH or —NH 2 ; R 1 and R 4 are independently hydrogen, alkyl, or —[C(R 10 R 11 )] p —C(R 12 )(X 2 )—R 13 ; R 2 , R 3 , R 5 , R 6 , R 7 , R 8 , R 10 , R 11 , and R 12 are independently hydrogen or alkyl; R 9 and R 13 are independently C 7 to C 30 alkyl or alkenyl; m and o are integers from 1 to 10; n is an integer from 1 to 6; and p is an integer from 1 to 10; wherein X 2 is —OH or —NH 2 ; R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , and R 28 are independently hydrogen or alkyl; R 27 is C 10 to C 30 alkyl or alkenyl; m and o are integers from 1 to 10; n is an integer from 1 to 6; and q is an integer from 0 to 10.
1 . A method of inhibiting corrosion at a surface, the method comprising contacting the surface with a corrosion-inhibiting effective amount of a polyamine compound of formula 1, the polyamine compound of formula 1 having the structure:
wherein
X 1 is —[C(R 10 R 11 )] p —C(R 12 )(X 2 )—R 13 ;
X 2 is —OH or —NH 2 ;
R 1 and R 4 are independently hydrogen, alkyl, or —[C(R 10 R 11 )] p —C(R 12 )(X 2 )—R 13 ;
R 2 , R 3 , R 5 , R 6 , R 7 , R 8 , R 10 , R 11 , and R 12 are independently hydrogen or alkyl;
R 13 is C 7 to C 20 alkyl or C 7 to C 20 alkenyl;
m and o are integers from 1 to 10;
n is an integer from 1 to 6; and
p is an integer from 1 to 10.
2 . The method of claim 1 , wherein R 1 and R 4 are independently hydrogen or —[C(R 10 R 11 )] p —C(R 12 )(X 2 )—R 13 .
3 . The method of claim 2 , wherein R 2 , R 3 , R 5 , R 6 , R 7 , R 8 , R 10 , R 11 , and R 12 are independently hydrogen, methyl, or ethyl.
4 . The method of claim 2 , wherein X 2 is —OH.
5 . The method of claim 1 , wherein m is an integer from 2 to 6.
6 . The method of claim 5 , wherein n is an integer from 2 to 6.
7 . The method of claim 6 , wherein o is an integer from 2 to 6.
8 . The method of claim 7 , wherein p is an integer from 1 to 4.
9 . A method of inhibiting corrosion at a surface, the method comprising contacting the surface with a corrosion-inhibiting effective amount of a polyamine compound having a structure of Formula 2
wherein
X 2 is —OH or —NH 2 ;
R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , and R 28 are independently hydrogen or alkyl;
R 27 is C 10 to C 30 alkyl or C 10 to C 30 alkenyl;
m and o are integers from 1 to 10;
n is an integer from 1 to 6; and
q is an integer from 0 to 10.
10 . The method of claim 9 , wherein X 2 is —OH.
11 . The method of claim 10 , wherein R 21 , R 22 , R 23 , R 24 , R 25 , R 26 , and R 28 are independently hydrogen, methyl, or ethyl.
12 . The method of claim 10 , wherein m is an integer from 2 to 6.
13 . The method of claim 10 , wherein n is an integer from 2 to 6.
14 . The method of claim 10 , wherein o is an integer from 2 to 6 and q is an integer from 0 to 6.
15 . The method of claim 1 , wherein the surface is a metal surface and the surface is part of a piece of equipment in an oil and gas refinery or petroleum plant and the piece of equipment is in a unit susceptible to aqueous corrosion and the piece of equipment is in an amine unit, a crude distillation unit, or a fluid catalytic cracking unit.
16 . The method of claim 1 , wherein the polyamine compound of Formula 1 is contacted with the surface at a concentration from 1 ppm to 1000 ppm of the active ingredient based on the weight of refinery stream being treated.
17 . The method of claim 1 , wherein X 2 is —OH and R 10 , R 11 , and R 12 are hydrogen.