Acryloyl based polymers with active end cap as corrosion inhibitors

Abstract

A corrosion inhibiting polymer is provided. The corrosion inhibiting polymer has a general formula of.

What is claimed is: 
     
         1 . A polymer of the general formula: 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are each independently chosen from divalent C 4 -C 7  aliphatic groups and divalent C 4 -C 7  heteroaliphatic groups, optionally substituted with one or more C 1 -C 6  aliphatic groups, heteroatoms independently chosen from S, N, and O, or combination thereof, wherein the divalent C 4 -C 7  heteroaliphatic groups of R 1  and R 2  comprise one or two heteroatoms independently chosen from S, N, and O, and the maximum number of heteroatoms in R 1  or R 2  is two; 
         R 3  is chosen from —OH, NH 2 , —OH, —OCH 3 , —OCH 2 —CH 3 , —NH—CH 2 —CH 3 , monovalent C 4 -C 7  aliphatic groups and monovalent C 4 -C 7  heteroaliphatic groups, optionally substituted with one or more C 1 -C 6  aliphatic groups, heteroatoms independently chosen from S, N, and O, or combinations thereof, wherein the monovalent C 4 -C 7  heteroaliphatic groups of R 3  comprise one or two heteroatoms independently chosen from S, N, and O, and the maximum number of heteroatoms in R 3  is two; 
         Z is a heteroatom selected from S, N, or O, or is an R 4  group; 
         R 4  are each independently chosen from —H, —CH 2 —COOH, —CH 2 —CH 2 —NH 2 , —CH 2 —CH 2 —NH 3 C, —CH 2 —CH 2 —OH or —CH 2 —CH 2 —CH 3 , or CH 3 . 
         x is a molar fraction range chosen from 0.1 to 0.9; 
         y is a molar fraction range chosen from 0.1 to 0.9; and 
         z is a molar fraction range chosen from 0 to 0.8, wherein the summation of x, y, and z equals 1. 
       
     
     
         2 . The polymer of  claim 1 , wherein R 1  is chosen from divalent C 4 -C 6  linear heteroaliphatic groups. 
     
     
         3 . The polymer of  claim 1 , wherein R 2  is chosen from divalent C 4 -C 6  linear heteroaliphatic groups. 
     
     
         4 . The polymer of  claim 1 , wherein R 3  is chosen from monovalent C 3 -C 7  linear heteroaliphatic groups. 
     
     
         5 . The polymer of  claim 1 , wherein R 3  is chosen from monovalent C 3 -C 7  linear aliphatic groups. 
     
     
         6 . The polymer of  claim 1 , wherein —NR 1  comprises a piperidine ring. 
     
     
         7 . The polymer of  claim 1 , wherein —NR 2  comprises a pyrrolidine ring. 
     
     
         8 . The polymer of  claim 1 , wherein —NR 1  comprises a piperidine ring and —NR 2  comprises a pyrrolidine ring. 
     
     
         9 . The polymer of  claim 1 , wherein —NR 1  comprises a piperidine ring, —NR 2  comprises a pyrrolidine ring, and —NR 3  comprises a monovalent C 3 -C 7  linear heteroaliphatic group. 
     
     
         10 . The polymer of  claim 1 , wherein z is 0. 
     
     
         11 . The polymer of  claim 1 , wherein Z is selected from S, O, or N. 
     
     
         12 . The polymer of  claim 1 , wherein Z is S. 
     
     
         13 . The polymer of  claim 1 , wherein R 4  is selected from —H, —CH 2 —COOH, —CH 2 —CH 2 —NH 3   + Cl − , and —CH 3 . 
     
     
         14 . The polymer of  claim 1 , wherein R 4  is —CH 2 —CH 2 —NH 3   + Cl −   
     
     
         15 . The polymer of  claim 1 , comprising acryloyl piperidine and acryloyl pyrrolidine monomer units. 
     
     
         16 . The polymer of  claim 1 , comprising acryloyl piperidine, acryloyl pyrrolidine, and acrylic monomer units. 
     
     
         17 . A method for inhibiting corrosion, the method comprising:
 contacting a metal with at least one polymer of the general formula:   
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are each independently chosen from divalent C 4 -C 7  aliphatic groups and divalent C 4 -C 7  heteroaliphatic groups, optionally substituted with one or more C 1 -C 6  aliphatic groups, heteroatoms independently chosen from S, N, and O, or combination thereof, wherein the divalent C 4 -C 7  heteroaliphatic groups of R 1  and R 2  comprise one or two heteroatoms independently chosen from S, N, and O, and the maximum number of heteroatoms in R 1  or R 2  is two; 
         R 3  is chosen from —OH, NH 2 , —OH, —OCH 3 , —OCH 2 —CH 3 , —NH—CH 2 —CH 3 , monovalent C 4 -C 7  aliphatic groups and monovalent C 4 -C 7  heteroaliphatic groups, optionally substituted with one or more C 1 -C 6  aliphatic groups, heteroatoms independently chosen from S, N, and O, or combinations thereof, wherein the monovalent C 4 -C 7  heteroaliphatic groups of R 3  comprise one or two heteroatoms independently chosen from S, N, and O, and the maximum number of heteroatoms in R 3  is two; 
         Z is a heteroatom selected from S, N, or O, or is an R 4  group; 
         R 4  are each independently chosen from —H, —CH 2 —COOH, —CH 2 —CH 2 —NH 2 , —CH 2 —CH 2 —NH 3 C, —CH 2 —CH 2 —OH or —CH 2 —CH 2 —CH 3 , or CH 3 . 
         x is a molar fraction range chosen from 0.1 to 0.9; 
         y is a molar fraction range chosen from 0.1 to 0.9; and 
         z is a molar fraction range chosen from 0 to 0.8, wherein the summation of x, y, and z equals 1. 
       
     
     
         18 . The method of  claim 17 , wherein the polymer is added to a fluid in contact with the metal. 
     
     
         19 . The method of  claim 17 , wherein the fluid comprises a brine. 
     
     
         20 . The method of  claim 17 , wherein the fluid comprises CO 2 , H 2 S, or both. 
     
     
         21 . The method of  claim 17 , wherein the fluid comprises a crude oil. 
     
     
         22 . The method of  claim 17 , wherein the fluid comprises a natural gas.