Process for preparing dimethylaminomethylenebis(phosphonic acid)

Details Process for preparing dimethylaminomethylenebis(phosphonic acid) Process for preparing dimethylaminomethylenebis(phosphonic acid)

1978-02-08

1979-06-05

Wyse, Thomas G.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

2605025, 260932, 252181, 422 15, 210 58, C07F 940

Patent

active

041573641

ABSTRACT:
Dimethylaminomethylenebis(phosphonic acid) is prepared by reacting dimethylformamide with phosphorous trichloride and treating the reaction mixture with alcohols or glycols and water. The phosphonic acid is combined with water soluble carboxylic acid polymers for use as a corrosion and scale inhibitor in aqueous systems. These compositions may also be combined with phosphorous acid and water soluble zinc salts.

REFERENCES:
patent: 3299123 (1967-01-01), Fitch et al.
patent: 3641223 (1972-02-01), Schlor et al.
patent: 3821335 (1974-06-01), Lewis
patent: 3846420 (1974-11-01), Wollmann et al.

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