Uses of methylene phosphonates of poly-diepoxidized polyalkylene polyamines
AssigneePetrolite Corporation
InventorPatrick M. Quinlan
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Abstract
Methylene phosphonates of poly-diepoxidized polyalkylene polyamines and to uses therefor, particularly as scale inhibitors, chelating agents, etc.
Claims10
A process of inhibiting the formation of scale in aqueous systems which comprises adding to the aqueous system a scale inhibiting amount of methylene phosphonates of poly-diepoxidized polyalkylene polyamines having 1. nitrogen-bonded methylene phosphonate units of the formula --CH.sub.2 PO(OM).sub.2 where M is alkali metal, alkaline earth metal, hydrogen, amine-derived ammonium or ammonium,
- 2.
at least one unit of the formula ##STR35## and
The process of chelating metal ions in an aqueous system which comprises adding to the aqueous system a chelating amount of methylene phosphonates of poly-diepoxidized polyalkylene polyamines having
- 1. nitrogen-bonded methylene phosphonate units of the formula --CH.sub.2 PO(OM).sub.2 where M is alkali metal, alkaline earth metal, hydrogen, amine-derived ammonium or ammonium,
- 2. at least one unit of the formula ##STR41##
- and 3. at least one unit of the formula ##STR42## the --CH.sub.2 -- of the ##STR43## unit (2) being bonded to one terimal nitrogen of the polyalkylene polyamine and the --CH.sub.2 -- of the ##STR44## unit (3) being bonded to the other terminal nitrogen of the polyalkylene polyamine, the poly-diepoxidized polyalkylene polyamine being the reaction product of polyalkylene polyamine and diepoxide.
Dependencies are inferred from the claim text.