Neues Aluminiumphosphat und Verfahren zu seiner Herstellung

摘要

1376491 Aluminium phosphate catalyst TEIKOKU KAKO CO Ltd 15 March 1972 [15 March 1971] 12168/72 Heading C1A Aluminium phosphate having an acidity of more than 3 m.eq./g., a pKa greater than 1À5 and an X-ray diffraction spectrum showing a prominent peak at 2# = 11À2 degrees is produced by heating and stirring a mixture of aluminium or an aluminium containing material (e.g. alumina, aluminium hydroxide and aluminium salts) and a P 2 O 5 containing material (e.g. phosphoric acid, ammonium phosphate, phosphorus pentoxide and phosphorus oxyhalide) to effect the formation of an opaque semi-solid intermediate product and subsequently dehydrating the product to cause crystallization. The intermediate product may be cooled prior to reheating to effect dehydration and crystallization. The first heating may be performed at 90‹ C. to 450‹ C' and the intermediate product may be heated at from 200‹ C. to 450‹ C. The so formed aluminium phosphate may be employed as a catalyst to effect dehydration of isopropyl alcohol contained in a nitrogen atmosphere to produce propylene and may be used in antirusting agents and binders.