Method and composition for inhibiting corrosion

Claim 1

A METHOD FOR REDUCING THE CORROSIVITY OF CORRODIBLE FERROUS METALS OF A CORROSIVE FLUID INCLUDING MOISTURE AND AN ACIDIC COMPONENT FROM THE GROUP CONSISTING OF CARBON DIOXIDE AND HYDROGEN SULFIDE IN CONTACT WITH SAID FERROUS METAL WHICH COMPRISES INTRODUCING INTO SAID FLUID A CORROSION INHIBITING AMOUNT OF THE REACTION PRODUCT OBTAINED BY HEATING TOGETHER FOR A TIME IN THE RANGE FROM ABOUT ONE-HALF TO TWO HOURS AT A TEMPERATURE FROM ABOUT 140* TO 200* C. REACTIVE AMOUNTS OF AN ALKANOL AMINE SELECTED FROM THE GROUP CONSISTING OF MONO- AND TRIETHANOL AMINE AND THE AMBER-COLORED VISCOUS RESIDUE CONTAINING LONG-CHAINED POLYCARBOXYLIC ACIDS, HAVING AN ACID NUMBER BETWEEN 140 AND 165, HAVING AN IODINE NUMBER BETWEEN THIRTY AND SIXTY, AND BEING THE NON-VOLATILE MATERIAL REMAINING FROM VACUUMDISTILLING AT 270* C. UNDER FOUR MM. PRESSURE AND BYPRODUCT ACIDS OBTAINED IN THE PREPARATION OF SEBACIC ACID FROM CASTOR OIL BY TREATMENT WITH ALKALI.