Method of inhibiting corrosion of metals

Claim 1

THE METHOD OF PROTECTING FERROUS METAL SURFACES EXPOSED TO CORROSIVE FLUIDS CONTAINING VARYING AMOUNTS OF HYDROGEN SULFIDE, CARBON DIOXIDE AND OTHER ACIDIC MATERIALS, WHICH COMPRISES INTRODUCING INTO THE CORROSIVE FLUID A QUANTITY, SMALL BUT A SUFFICIENT IN AMOUNT TO SUBSTANTIALLY INHIBIT CORROSION, OF A PRODUCT PREPARED BY FIRST HEATING TOGETHER 1 MOL OF A POLYETHYLENEAMINE SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE TRIAMINE, TRIETHYLENE TETRAMINE AND TETRAETHYLENE PENTAMINE WITH 1 MOL OF AN ALDEHYDE HAVING FROM 1 TO ABOUT 15 CARBON ATOMS UNDER REFLUX SO AS TO REMOVE FROM THE REACTANT MIXTURE 1 MOL OF WATER BY AZEOTROPIC DISTILLATION, THEREBY EFFECTING FORMATION OF OF THE IMIDAZOLIDINE RING AND TREATING THE IMIDAZOLIDINE RING COMPOUND UNDER CONDITIONS WHICH EFFECT OXYETHYLATION WITH FROM 1 TO 2 MOLS OF EHTYLENE OXIDE TO PROVIDE THE DESIRED FINAL REACTION PRODUCT, AND PASSING THE CORROSIVE FLUID CONTAINING THE FINAL PRODUCT IN CONTACT WITH THE METAL TO BE PROTECTED.

Claim 2

THE METHOD OF PROTECTING FERROUS METAL SURFACES EXPOSED TO CORROSIVE FLUIDS CONTAINING VARYING AMOUNTS OF HYDROGEN SULFIDE, CARBON DIOXIDE AND OTHER ACIDIC MATERIALS, WHICH COMPRISES INTRODUCING INTO THE CORROSIVE FLUID A QUANTITY, SMALL BUT A SUFFICIENT IN AMOUNT TO SUBSTANTIALLY INHIBIT CORROSION, OF A PRODUCT PREPARED BY FIRST HEATING TOGETHER 1 MOL OF A POLYETHYLENEAMINE SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE TRIAMINE, TRIETHYLENE TETRAMINE AND TETRAETHYLENE PENTAMINE WITH 1 MOL OF AN ALDEHYDE HAVING FROM 1 TO ABOUT 15 CARBON ATOMS UNDER REFLUX SO AS TO REMOVE FROM THE REACTANT MIXTURE 1 MOL OF WATER BY AZEOTROPIC DISTILLATION, THEREBY EFFECTING FORMATION OF OF THE IMIDAZOLIDINE RING AND TREATING THE IMIDAZOLIDINE RING COMPOUND UNDER CONDITIONS WHICH EFFECT OXYETHYLATION WITH FROM 1 TO 2 MOLS OF EHTYLENE OXIDE TO PROVIDE THE DESIRED FINAL REACTION PRODUCT, AND PASSING THE CORROSIVE FLUID CONTAINING THE FINAL PRODUCT IN CONTACT WITH THE METAL TO BE PROTECTED.