Preparation of phosphate-containing alumina gels

Claim 1

A PROCESS FOR PRODUCING A PHOSPHATE-CONTAINING ALUMINA GEL COMPRISING REACTING IN AQUEOUS SOLUTION A WATERSOLUBLE BASIZ ALUMINUM SALT CHARACTERIZED BY THE FORMULA: (ALA(OH)BE)X WHERE Y IS AN ACID ANION SELECTED FROM THE GROUP CONSISTING OF C1-,NO3,-,BR-, AND U-, A IS A NUMBER BETWEEN 1 AND 10, B IS A NUMBER BETWEEN 1 AND 29, C IS A NUMBER BETWEEN 1 AND 29, AND X IS A NUMBER BETWEEN 1 AND 100, AND AN AMMONIUM ACID PHOSPHATE TO EFFECT FORMATION OF A HOMOGENEOUS HYDROSOL CHARACTERIZED BY PH BETWEEN ABOUT 3 AND ABOUT 5, PERMITTING SAID HUDROSOL TO SET TO AN ALL-EMBRACING POHSPHATE-CONTAINING ALUMINA HYDROGEL, TREATING THE HYDROGEL SO OBTAINED IN A BASIC MEDIUM FOR A SUFFICIENT TIME TO RENDER THE HYDROGEL RESISTANT TO DISINTERGRATION UPON SUBSEQUENT CONTACT WITH AQUEOUS MEDIA, THEREAFTER WASHING THE HYDROGEL FREE OF WATER-SOLUBLE MATTER, AND DRYING.