Thiacrown ether compound corrosion inhibitors for alkanolamine units
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Jun 2, 1998
filing date -
Jun 2, 1998
priority date (Note) -
Expired
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Abstract
The corrosion of metals in contact with aqueous alkanolamine solution in acid gas removal units is inhibited by adding to the alkanolamine solution a corrosion inhibiting amount of a thiacrown ether compound. The compounds are monomeric or polymeric and have from 4 to about 10 sulfur atoms on each of the crown rings. The polymeric thiacrown ether ring structures are substituted with polymerized ethylenically unsaturated monomers and have from 4 to about 10 sulfur atoms on each of the crown rings. In some embodiments of the invention, a linkage 'M' connects the thiacrown ether ring structures and the polymers and M is O; S; COO; C.sub.1 to C.sub.5 substituted or unsubstituted linear or branched alkylene wherein the substituent is OH, SH, F, Br, Cl, I, COOH, amine, mono- or di- C.sub.1 to C.sub.5 alkylamino, C.sub.1 to C.sub.3 lower alkanoylamino or nitro; or M is NR.sub.6 where R.sub.6 is H or C.sub.1 to C.sub.5 alkyl.
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