Process for preparation of mordenite type zeolite

Claim 1

A process for the preparation of a mordenite zeolite which comprises the steps of: (1) simultaneously and continuously supplying an aqueous solution of an alkali metal silicate and an aluminum-containing aqueous solution at a substantially constant ratio into an overflow type reaction vessel with a stirrer and reacting the alkali metal silicate with the aluminum-containing aqueous solution while the pH of the reaction mixture is maintained at a value of 5 to 9, and the residence time of any portion of the reaction slurry in the reaction vessel is maintained at least three minutes, to obtain a microangular amorphous alumino-silicate of a homogeneous phase which is composed of, on the dry basis, 3.2 to 11.3% by weight of aluminum calculated as anhydrous Al 2 O 3 , 2.1 to 8.2% by weight of sodium calculated as anhydrous Na 2 O and the balance of silicon calculated as anhydrous SiO 2 , the microangular amorphous aluminosilicate in the form of a spherical particle having a particle size of from 1 to 500 microns, and then (2) crystallizing the microangular amorphous aluminosilicate of the homogeneous phase at a temperature of 130° to 250° C. in an aqueous solution containing 0.3 to 5% by weight of sodium hydroxide.