N-Sulfo alkane amino alkane phosphoric acids and their alkali metal salts, and a process of producing same

US4216163A · kind A · utility

Assignee

• Benckiser-Knapsack GmbH · DE

Inventors

• Klaus Sommer · Heidelberg, DE
• Hermann Weber

Key dates

• Filing date: Mar 28, 1978
• Grant date: Aug 5, 1980
• Expiry date: Mar 28, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F5/14
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Novel and highly advantageous N-sulfo alkane amino alkane phosphonic acids and their alkali metal salts are provided. Said phosphonic acids are produced by reacting an alkali metal salt of an amino phosphonic acid with a halo, preferably chloro, or hydroxy alkane sulfonic acid or their alkali metal salts in an alkaline medium, while heating. In place of the halo and especially chloro or hydroxy alkane sulfonic acid reactants, there can also be used compounds which are capable of producing hydroxy alkane sulfonates such as carbylsulfate or aldehydes or, respectively, ethylene oxide with alkali metal bisulfites or metasulfites. The reaction is preferably carried out in a molar proportion of about 1:1 to about 1:2. The novel compounds are excellent complexing or sequestering agents especially with respect to polyvalent metal ions. They are highly resistant against hydrolysis and high temperatures and are of a very high water solubility.