Oil soluble molybdenum complexes for inhibiting high temperature corrosion and related applications in petroleum refineries
AssigneeEcolab USA Inc.
InventorsOussama Zenasni, Janelle Pennington, Ramon Colorado, Jr., Philip Andrew Thornthwaite
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Abstract
Disclosed are molybdenum-containing complexes used in compositions and methods for inhibiting or reducing high temperature corrosion in petroleum refineries.
Claims12
A method of inhibiting corrosion of a metal containment in a crude oil refining process, wherein the metal containment comprises an acidic fluid source containing crude oil or a fraction thereof and an acidic corrodents, comprising:
- introducing into the acidic fluid source at least one molybdenum-containing complex having the formula selected from the group consisting of Formula I, II, III, and IV;
- wherein the acidic fluid source has a temperature in the range of 175° C. to 600° C.;
- wherein the acidic corrodents comprise a naphthenic acid and sulfur in the form of hydrogen sulfide, an organic sulfide, a mercaptan, or sulfur dioxide;
- and wherein each of Formula I, II, III, or IV is given by the following:
- wherein R1, R2, R3, and R4, are each a hydrocarbon group and wherein R1, R2, R3, and R4 can be the same or different;
- and X is oxygen or sulfur and X can be the same or different;
- wherein Y1 and Y2 are each oxygen, nitrogen or carbon-containing ligands and Y1 and Y2 can be the same or different and X is each oxygen or sulfur, and X can be the same of different from each other.
A method of inhibiting corrosion of a metal containment in a crude oil refining process, wherein the metal containment comprises an acidic fluid source containing crude oil or a fraction thereof and an acidic corrodent that causes the metal containment to corrode, comprising:
- pre-passivating a metal surface of the metal containment to provide a treated, pre-passivated process containment surface, said pre-passivating comprising contacting the metal surface with a corrosion inhibiting, passivating composition comprising at least one molybdenum-containing complex;
- contacting the treated, pre-passivated process containment surface with the acidic fluid source;
- and
- introducing into the acidic fluid source at least one molybdenum-containing complex in an amount effective to reduce corrosion associated with the acidic corrodent.
Dependencies are inferred from the claim text.