Corrosion inhibitor

Abstract

The present invention is directed to an aqueous amine resin corrosion inhibitor composition and methods of using the same for inhibiting corrosion in equipment in contact with alkanolamine, hot carbonate solutions, diglyme and/or other solvents and acid gases such as carbon dioxide, hydrogen sulfide or a mixture of the two. The inhibitor preferably relates to compositions useful for inhibiting corrosion in environments in contact with alkanolamine, hot carbonate solutions, diglyme, and/or solvent gas treating systems and acid gases, and more particularly, to an amine resin solution made by reacting sterically hindered amines such as those selected from the group consisting of alkyl diamines, alkyltriamines, amino alcohols and mixtures thereof with aldehydes, aldehyde donors, the reaction product of lower alkanolamines and lower aldehydes, and mixtures thereof. The subject compositions are preferably made by reacting the sterically hindered amines and aldehyde compounds in about a 1:1 molar ratio at a temperature ranging from about 110° F. to 120° F., using a sufficient amount of the sterically hindered amine to produce a reaction product having a pH ranging from about 10.5 to about 12.0.

What we claim is:  
     
         1 . A method for inhibiting corrosion in environments in contact with alkanolamine, hot carbonate solutions, diglyme, or solvents and acid gases such as CO 2 , H 2 S, and mixtures thereof, said method comprising: 
 injecting into said environment an aqueous amine resin solution.    
     
     
         2 . The method of  claim 1  wherein the aqueous amine resin solution is the product of reacting a sterically hindered amine with a compound selected from the group consisting of aldehydes, aldehyde donors, the reaction products of lower alkanolamines and lower aldehydes, or mixtures thereof.  
     
     
         3 . The method of  claim 2  wherein the amine resin is the product of reacting a sterically hindered amine and an aldehyde compound in about a 1:1 molar ratio.  
     
     
         4 . The method of  claim 2  wherein the solution is the product of adding a sufficient amount of amine to produce a product having a pH ranging from about 10.5 to about 12.  
     
     
         5 . The method of  claim 2  wherein the sterically hindered amine is selected from the group consisting of diamines, triamines, amino alcohols, and mixtures thereof.  
     
     
         6 . The method of  claim 1  wherein the aqueous amine resin solution is injected in an amount to obtain about 25 ppm to about 5000 ppm of resin solution in a batch mode of injection, or lower in a continuous mode of injection.  
     
     
         7 . A non-toxic composition for inhibiting corrosion in environments in contact with alkanolamine, hot carbonate solution, diglyme, or other solvents gas treating systems, said composition comprising: 
 the reaction product made from reacting a sterically hindered amine selected from the group consisting of diamines, triamines, amino alcohols, and mixtures thereof, with an aldehyde, an aldehyde donor, a reaction product of lower alkanolamines and lower aldehydes, or mixtures thereof.    
     
     
         8 . The composition of  claim 7  wherein the amine and aldehyde components are present in about a 1:1 molar ratio.  
     
     
         9 . The composition of  claim 7  wherein a sufficient amount of amine is added to produce a reaction product having a pH ranging from about 10.5 to about 12.