Monsanto Company

Monsanto Europe S.a.

Michel A Ledent

Bronislav H May

Concentrated aqueous hexamethylene phonic acid solutions are described containing, in addition to high levels e.g. 40%-50% of phosphonic acid a narrowly defined level of non-oxidizing mineral acid, preferrably hydrochloric acid.

Hexamethlene phosphonate concentrate

Aqueous solutions of aminomethylenephosphonic acid selected from diethylenetriaminepenta(methylenephosphonic acid), diethylenetriaminetetra(methylenephosphonic acid), diethylenetriaminetri(methylenephosphonic acid) and mixtures thereof are stabilized against crystallization of said aminomethylenephosphonic acid by including non-oxidizing mineral acid in such solutions in an amount stoichiometrically equivalent to at least 10% hydrochloric acid by weight of the solution.

Aminomethylenephosphonic acid solutions

Aqueous solutions of aminomethylenephosphonic acid selected from diethylenetriaminepenta(methylenephosphonic acid). diethylenetriaminetetra(methylenephosphonic acid), diethylenetriaminetri(methylenephosphonic acid) and mixtures thereof are stabilized against crystallization of said aminomethylenephosphonic acid by including non-oxidizing mineral acid in such solutions in an amount stoichiometrically equivalent to at least 10% hydrochloric acid by weight of the solution.

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Saint Marc, Belgium

Michel A Ledent