Patent · US Expired

Process for the manufacture of alkali metal polyphosphates

US3993734A · kind A · utility

3Cited by

3References

12Claims

0Family size

Assignee

Rhone-Progil · FR

Inventors

Jean-Michel Verdier · Paris, FR
Jacques Becuwe · Fontenay-sous-Bois, FR
Jacques Chastel · Mont-Saint-Aignan, FR

Key dates

Filing date	Jun 30, 1975
Grant date	Nov 23, 1976
Priority date	—
Expiry date	Jun 30, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B25/412
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for the manufacture of alkali metal polyphosphates having a predetermined crystalline form, in which a mixture of alkali metal orthophosphates having a molar ratio of alkali metal oxide to phosphoric anhydride between 1 and 2 is first granulated, the resulting granules are dried and then are subjected to thermal treatment in the presence of aqueous vapor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.