Method for the manufacturing of alkali monofluorophosphate

US5393506A · kind A · utility

Assignee

• Kali-Chemie Aktiengesellschaft · DE

Inventors

• Hans-Walter Swidersky · Hannover, DE
• Werner Rudolph · Hannover, DE
• Ulrich Hartmann · Überlingen, DE
• Frank Moewius · Berlin, DE
• Veronika Radonz · Hohen Neuendorf, DE
• Manfred Meisel · Berlin, DE

Key dates

• Filing date: Oct 7, 1993
• Grant date: Feb 28, 1995
• Expiry date: Oct 7, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B25/455
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method for manufacturing alkalimonofluorophosphate of general formula M.sub.2 PO.sub.3 F(I), where M stands for the cation of a metal of the first main group of the periodic system, in particular potassium, a reaction mixture containing alkali metal cations M, phosphate, fluoride, particularly in the form of alkali hydroxide, phosphoric acid and hydrofluoric acid, and water, the molar ratio of M:P:F being (2.+-.0.1):(1.+-.0.05):(1.+-.0.1) and the molar ratio of water:P being at least 1:1, is heated to a temperature of 150.degree. C. to 400.degree. C. Alkalimonofluorophosphate of general formula (I) occurs, with evaporation of water, as a reaction product, which is then isolated.