Claims
- 1. A composition for inhibiting corrosion of steel containing greater than about 9% chromium exposed to elevated temperatures above about 250.degree. F. to about 475.degree. F. and to at lest one mineral acid, comprising:
- an organic inhibitor selected from the group consisting of phenyl ketone, phenyl ketone with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound, and cinnamaldehyde with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound; and
- an acid-soluble compound from the group consisting of antimony and bismuth.
- 2. A composition as defined in claim 1, further comprising a surfactant.
- 3. A composition as defined in claim 1, wherein the phenyl ketone is a member of the group consisting of phenones, .alpha.-alkenylphenones and .alpha.-hydroxyalkenylphenones.
- 4. A composition as defined in claim 1, wherein, the quaternary salt of a nitrogen-containing heterocyclic aromatic compound is a member of the group consisting of alkyl pyridinium halides, alkylaryl pyridinium halides, alkyl quinolinium halides, alkylaryl quinolinium halides, alkyl isoquinoliniun halides, alkylaryl isoquinolinium halides, alkyl benzoazolinium halides, alkylaryl benzoazolinium halides, alkyl benzothiazolinium halides and alkylaryl benzothiazolinium halides.
- 5. A composition as defined in claim 1, wherein the acid-soluble compound is antimony, further comprising a member of the group consisting of formic acid and a formic acid derivative.
- 6. A composition as defined in claim 1, wherein the acid-soluble compound is bismuth further comprising a compound generating a soluble iodide under acidic conditions.
- 7. A composition for inhibiting corrosion of steel having greater than about 9% chromium exposed to elevated temperatures above about 250.degree. F. to about 475.degree. F. and to a volume (D) of at least one mineral acid, comprising:
- from about 0.1 to 2 wt %, compared to D, of an organic inhibitor selected from the group consisting of phenyl ketone, phenyl ketone with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound, and cinnamaldehyde with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound;
- from about 0.1 to 2 wt %, compared to D, Bi.sub.2 O.sub.3 and from about 0.1 to 2 wt %, compared to D, soluble iodide.
- 8. A composition for inhibiting corrosion of steel having greater than about 9% chromium exposed to elevated temperatures above about 250.degree. F. to about 475.degree. F. and to a volume (D) of at least one mineral acid, comprising:
- from 0.1 to approximately 2% wt %, compared to D, or an organic inhibitor selected from the group consisting of phenyl ketone, phenyl ketone with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound, and cinnamaldehyde with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound; and
- from 0.01 to approximately 2 wt %, compared to D, of a acid-soluble antimony compound.
- 9. A composition as defined in claim 8, further comprising from 0.5 to 10 wt %, compared to D, of a member of the group consisting of formic acid and a formic acid derivative.
- 10. A composition as defined in claim 9, wherein the formic acid derivative is a member of the group consisting of unsubstituted formamide, substituted formamide, unsubstituted formate and substituted formate.
- 11. A composition as defined in claim 9, wherein the acid soluble antimony compound is a member of the group consisting of SbCl.sub.3 and Sb.sub.2 O.sub.3.
- 12. A process for inhibiting corrosion of steel having greater than about 9% chromium, exposed to at least one mineral acid and elevated temperatures above about 250.degree. F. to about 475.degree. F., comprising the steps of:
- providing a composition of an organic inhibitor selected from the group consisting of phenyl ketone, phenyl ketone with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound and cinnamaldehyde with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound; and an acid-soluble metal from the group consisting of an antimony and bismuth; and
- exposing the steel to an effective amount of the composition.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 07/474,232, filed Jan. 30, 1990, now U.S. Pat. No. 5,013,483, application Ser. No. 07/013,603, filed Feb. 12, 1987, now abandoned, and application Ser. No. 06/765,890, filed Aug. 14, 1985, now abandoned.
US Referenced Citations (19)
Non-Patent Literature Citations (1)
Entry |
Raymond Jasinski et al., "Inhibiting HCl Corrosion of High Chrome Tubular Steels" presented at Corrosion 88, pp. 188/1 to 188/13 (Mar. 21-25, 1988). |
Related Publications (2)
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Number |
Date |
Country |
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13603 |
Feb 1987 |
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765890 |
Aug 1985 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
474232 |
Jan 1990 |
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