Corrosion inhibitor compositions and methods of using same
View Patent ↗Disclosed herein are sulfur-functional corrosion inhibitors that are adducts of a cyclic anhydride with 2-mercaptoethanol. Concentrates of the sulfur-functional corrosion inhibitors do not degrade to form H 2 S under standard storage conditions for a period of up to 5 years. Also disclosed herein are treated water sources and treated metal containments including one or more sulfur-functional corrosion inhibitors. The sulfur-functional corrosion inhibitors inhibit corrosion of metal containments contacted with one or more water sources, wherein the one or more water sources comprise one or more corrodents. The sulfur-functional corrosion inhibitors are as effective or more effective at inhibiting corrosion than conventional sulfur-based corrosion inhibitors when compared on a weight or a volume basis.
1. A sulfur-functional corrosion inhibitor composition comprising a compound according to formula I and the compound according to formula II,
wherein R 1 is hydrogen, sodium, lithium, potassium, or an ammonium; and R 2 is CH═CH, CH 2 —CH 2 , or CH(S—CH 2 —CH 2 —OH)CH 2 .
2. The composition of claim 1 further comprising a solvent.
3. The composition of claim 2 wherein the composition comprises about 10 wt. % to 99 wt. % of the solvent.
4. A treated water source comprising the sulfur-functional corrosion inhibitor composition and a produced water, the sulfur-functional corrosion inhibitor composition comprising a compound according to formula I, the compound according to formula II, or any combination thereof,
wherein R 1 is hydrogen, sodium, lithium, potassium, or an ammonium; and R 2 is CH═CH, CH 2 —CH 2 or CH(S—CH 2 —CH 2 —OH)CH 2 .
5. The treated water source of claim 4 wherein the treated water source comprises about 0.5 ppm to 500 ppm by weight of the sulfur-functional corrosion inhibitor composition.
6. The treated water source of claim 4 wherein the produced water comprises a corrodent comprising hydrogen sulfide, carbon dioxide, oxygen, sodium chloride, calcium chloride, or sulfur dioxide.
7. The treated water source of claim 6 wherein the produced water comprises H 2 S.
8. A treated metal containment comprising: a metal containment comprising a metal surface; and the treated water source of claim 4 in contact with the metal surface or a portion thereof.
9. The treated metal containment of claim 8 wherein the metal containment is a tank or a pipe.
10. The treated metal containment of claim 8 wherein the metal surface comprises a carbon steel.
11. The treated metal containment of claim 8 wherein the rate of corrosion of the contacted metal surface is reduced when compared to the same metal surface contacted by the same water source wherein the sulfur-functional corrosion inhibitor composition is replaced by the same weight of thioglycolic acid.
12. A method of treating a metal containment, the method comprising:
a. applying a sulfur-functional corrosion inhibitor composition to a water source form a treated water source, the sulfur-functional corrosion inhibitor composition comprising: a compound according to formula I, the compound according to formula II, or any combination thereof
wherein R 1 is hydrogen, sodium, lithium, potassium, or an ammonium; and R 2 is CH═CH, CH 2 —CH 2 , or CH(S—CH 2 —CH 2 —OH)CH 2 ; and
b. contacting a metal surface of the metal containment with the treated water source.
13. The method of claim 12 wherein the applying consists essentially of applying the compound having formula II.
14. The method of claim 12 wherein the applying consists essentially of applying a compound having formula I.
15. The method of claim 12 wherein the applying is applying a total of about 0.5 ppm to 500 ppm by weight of the sulfur-functional corrosion inhibitor composition to the water source.