Low toxicity corrosion inhibitor
AssigneeBaker Hughes Incorporated
InventorPhilippe Prince
Life of this patent
Estimating the term…
Abstract
A water soluble corrosion inhibitor containing a compound having at least one five-membered heterocyclic ring having at least one thione group and at least one other pendant group is described. Such a corrosion inhibiting compound can be made by reacting together a thiourea and a polyalkylene polyamine. A specific example includes preparing 1-(2-aminoethyl)-2-imidazolidinethione by reacting thiourea, per se, and diethylenetriamine. These corrosion inhibition compounds have greatly reduced aquatic toxicity, and may be employed as corrosion inhibitors in hydrocarbon streams.
Claims10
A water soluble corrosion inhibitor solution comprising a solvent;
- and
- a compound having at least one five-membered heterocyclic ring having at least one thione group and at least one other pendant group, where the other pendant group is selected from the group consisting of:
- --CH.sub.2 CH.sub.2 NH.sub.2 ;
- --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 ;
- --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 ;
- --CH.sub.2 CH.sub.2 OH;
- and mixtures thereof;
- said compound being present in the solution in an amount effective to reduce corrosion of a metal.
A method of inhibiting corrosion of metal in contact with a fluid comprising adding to the fluid an effective amount of a compound having at least one five-membered heterocyclic ring having at least one thione group and at least one other pendant group selected from the group consisting of:
- --CH.sub.2 CH.sub.2 NH.sub.2 ;
- --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 ;
- --CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 ;
- --CH.sub.2 CH.sub.2 OH;
- and mixtures thereof.
A method of preparing of a compound having at least one five-membered heterocyclic ring having at least one thione group and at least one other pendant group, comprising reacting a thiourea and a polyalkylene polyamine in the presence of nitrogen.
Dependencies are inferred from the claim text.