N-Phosphono methylene amino alkane phosphonic acid compounds, process of producing same, and method and compositions of using same

US4098814A · kind A · utility

Assignee

• Benckiser-Knapsack GmbH · DE

Inventors

• Klaus Sommer · Heidelberg, DE
• Guenter Raab · Hemsbach, DE

Key dates

• Filing date: May 23, 1977
• Grant date: Jul 4, 1978
• Expiry date: May 23, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/3873
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Valuable and highly water soluble N-phosphono methylene mono- and di-amino alkane mono- and polyphosphonic acids which have not only an >N--CH.sub.2 --PO.sub.3 H.sub.2 group but also a C--PO.sub.3 H.sub.2 group in their molecule are produced by reacting amino alkane mono- or diphosphonic acids with formaldehyde and phosphorous acid or alkane nitriles with phosphorous acid, formaldehyde, and concentrated hydrochloric acid. The resulting phosphonic acid compounds are valuable sequestering agents forming complex compounds with bi- and polyvalent metal ions. They are useful for water softening even in substoichiometric amounts, in textile treatment baths, in the paper manufacture, in tanning baths, for the manufacture of liquid fertilizers, and for other purposes.