Claims
- 1. An aqueous acid gas removal solutioon inhibited against acid gas promoted corrosion of metals comprising:
- a) an alkanolamine;
- b) a thiodialkanol effective as a corrosion inhibitor and having the formula;
- S(ROH).sub.2
- where R is C.sub.1 to C.sub.10 alkyl; C.sub.6 to C.sub.10 aryl; C.sub.3 to C.sub.10 cycloalkyl; or C.sub.7 to C.sub.12 aralkyl; and
- c) water.
- 2. The aqueous acid gas removal sulution inhibited against acid gas promoted corrosion of claim 1 wherein said thiodialkanol is selected from the group consisting of 3,3'-thiodi-n-propanol; 4-thia-1,7-heptanediol; 4,4'-thiodi-n-butanol; 5-thia-1,9-nonanediol; 2,2-thiodiethanol; 4-thia-2,6-heptanediol; 3-thia-2,4-dimethyl-1,5-pentanediol; 3-thia-1,5-diphenyl-1,5-pentanediol; 3-thia-2,4-diphenyl-1,5-pentanediol; 3-thia-1,5-dicyclohexyl-1,5-pentanedoil; bis-(2-hydroxycyclohexyl)sulfide; and 3,6-dithia-1,8-octanediol.
- 3. The aquious acid gas removal solution inhibited against acid gas promoted corrosion of claim 1 wherein said thiodialkanol is 2,2-thiodiethanol; 3,3'-thiodi-n-propanol; or 4,4'-thiodi-n-butanol.
- 4. The aqueous acid gas removal solution inhibited against acid gas s promoted corrosion of claim 10 wherein said solution comprises about 15 to 75 weight percent alkanolamine, less then about 1 weight percent thiodialkanol and from about 25 to 85 weight percent water with the proviso that the combined weight percentages equal 100 weight percent.
- 5. A corrosion inhibitor, for inhibiting corrosion of metals in contact with an aqueous alkanolamine solution in acid gas removal equipment, comprising a thiodialkanol having the formula:
- S(ROH).sub.2
- where R is C.sub.1 to C.sub.10 alkyl; C.sub.6 to C.sub.10 aryl; C.sub.3 to C.sub.10 cycloalkyl; or C.sub.7 to C.sub.12 aralkyl.
- 6. The composition of claim 5 wherein said thiodialkanol is selected from the group consisting of 3,3'-thiodi-n-propanol; 4-thia-1,7-heptanediol; 4,4'-thiodi-n-butanol; 5-thia-1,9-nonanediol; 2,2-thiodiethanol; 4-thia-2,6-heptanediol; 3-thia-2,4-dimethyl-1,5-pentanediol; 3-thia-1,5-diphenyl-1,5-pentanediol; 3-thia-2,4-diphenyl-1,5-pentanediol; 3-thia-1,5-dicyclohexyl-1,5-pentanediol; bis-(2-hydroxycyclohexyl)sulfide; and 3,6-dithia-1,8-octanediol.
- 7. The composition of claim 5 wherein said thiodialkanol is 2,2 -thiodiethanol; 3,3'-thiodi-n-propanol; or 4,4'-thiodi-n-butanol.
Parent Case Info
This is a divisional of application Ser. No. 08/920.277 filed Aug. 22. 1997 U.S. Pat. No. 5,843,373.
US Referenced Citations (23)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1487365 |
Jul 1967 |
FRX |
298638 |
Mar 1971 |
SUX |
Divisions (1)
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Number |
Date |
Country |
Parent |
920277 |
Aug 1997 |
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