Patent ID: 9056775
Filing Date: 2015-06-16
Classification: A61L,C01B

Abstract:
1. A process for the preparation of an inorganic hydrogel of formula M 3 (H 2 O) 4 (PO 4 ) wherein M is selected from alkali metals for the corresponding alkali halides under mild conditions and the process comprising the steps of: (i) adding alkali halide in water, a solution of sodium phosphate and a solution of alkali hydroxide and stirring for 1 to 2 minutes at temperature in the range of 30 to 35° C.; (ii) stirring the reaction mixture as obtained in step (i) at a speed in the range of 400 to 1000 rpm for 15 to 20 minutes and maintaining the temperature in the range of 40 to 80° C.; (iii) cooling the solution as obtained in step (ii) for a period of 4 to 6 hours to obtain inorganic hydrogel; and (iv) storing the inorganic hydrogel as obtained in step (iii) for 15 to 20 hours to transform the inorganic hydrogel into crystalline form.