Metal ion complexes for use as scale inhibitors

Details Metal ion complexes for use as scale inhibitors Metal ion complexes for use as scale inhibitors

C - Chemistry, Metallurgy

23

F

134/35

C23F 11/10 (2006.01) C02F 5/14 (2006.01) C09K 8/528 (2006.01)

Patent

CA 2040179

METAL ION COMPLEXES FOR USE AS SCALE INHIBITORS Abstract of the Disclosure Complex molecules of phosphonic acid ligands and transition metal ions are found to be surprisingly good at inhibiting and even preventing scale in aqueous solutions, crude oils, aqueous production fluids, heat exchange media, etc. Ethylenediaminetetra(methylenephosphonic) acid (ENTMP) complexed with copper (II) is a particularly effective scale inhibitor over wide pH and temperature ranges. Other useful metal complex molecules include various alkyleneamino(alkylphosphonic) acids, or salts thereof, complexed with transition metals such as nickel (II), cobalt (II) and zinc (II), in addition to copper (II). The active complexes may be termed phosphonate metal complexes, or in some forms, phosphonic acid metal complexes.

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