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

1991-10-14

1993-05-04

Hruskoci, Peter

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

1662441, 252180, C02F 514

Patent

active

052079198

ABSTRACT:
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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P. H. Ralston, "Inhibiting Water Formed Deposits with Threshold Compositions," Materials Performance, vol. 11, No. 6, 1972, pp. 39-44.
R. J. Motekaitis, et al., "Equilibria of Ethylenediamine-N,N,N',N'-tetrakis(methylenephosphonic) Acid with Cu(II), Ni(II), Co(II), Zn(II), Mg(II), Ca(II), and Fe(III) Ions in Aqueous Solution," Inorganic Chemistry, vol. 15, No. 19, 1976, pp. 2303-2306.
M. T. M. Zaki, et al., "Metal Chelates of Phosphonate-Containing Ligands IV: Stability of Some 1,6-Hexamethylenediamine-N,N,N',N'-Tetra(methylenephosphonic) Acid Metal Chelates," Talanta, vol. 27, 1980, pp. 709-713.
B. Spiess, et al., "Complexing Properties of Nitrilotri(methylenephosphonic) Acid with Various Transition and Heavy Metals in a 10:90 Ethanol-Water Medium," Polyhedron, vol. 6, No. 6, 1987, pp. 1247-1249.

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