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Methylene phosphonates of poly-diepoxidized polyalkylene polyamines
| Details |
Inventors: Quinlan, Patrick M.;
Assignee: Petrolite Corporation (St. Louis, MO)
Primary Examiner: Evans; Joseph E.
Assistant Examiner:
Attorney, Agent or Firm: Ring; Sidney B., Glass; Hyman F.
Methylene phosphonates of poly-diepoxidized polyalkylene polyamines and to uses therefor, particularly as scale inhibitors, chelating agents, etc. |
|
DETAILED DESCRIPTION We claim: 1.
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 ##STR34## and (3) at least one unit of the formula ##STR35## the --CH.
sub.
2 -- of the ##STR36## unit (2) being bonded to one terminal nitrogen of the polyalkylene polyamine and the --CH.
sub.
2 -- of the ##STR37## 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.
2.
The methylene phosphonates of poly-diepoxidized polyalkylene polyamines of claim 1 where the polyalkylene polyamines are polyethylene polyamines.
3.
The methylene phosphonates of poly-diepoxidized polyalkylene polyamines of claim 2 where the polyethylene polyamines are of the formula ##STR38## 4.
The methylene phosphonates of a poly-diepoxidized polyalkylene polyamine having repeating units of the formula ##STR39## where X is hydrogen or --CH.
sub.
2 PO(OM).
sub.
2 where M is alkali metal, alkaline earth metal, hydrogen, amine-derived ammonium or ammonium and at least 50% of the X units are CH.
sub.
2 PO(OM).
sub.
2.
5.
The methylene phosphonates of poly-diepoxidized polyalkylene polyamines of claim 4 where at least 80% of the X units is --CH.
sub.
2 PO(OM).
sub.
2 .
Description:
Most commercial water contains alkaline earth metal cations, such as calcium, barium, magnesium, etc.
, and anions such as bicarbonate, carbonate, sulfate, oxalate, phosphate, silicate, fluoride, etc.
When combinations of these anions and cations are present in concentrations which exceed the solubility of their reaction products, precipitates form until their product solubility concentrations are not longer exceeded.
For example, when the concentrations of calcium ion and carbonate ion exceed the solubility of the calcium carbonate reaction product, a solid phase of calcium carbonate will form as a precipitate
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