PROCESS FOR THE PREPARATION OF CRYSTALLINE ALUMINIUM SILICATES, CRYSTALLINE ALUMINIUM SILICATES SO PREPARED AND PROCESS FOR THE PRODUCTION OF AN AROMATIC HYDROCARBON MIXTURE

摘要

Process for the preparation of crystalline aluminum silicates. As aqueous mixture containing a compound of an alkali metal (M), a quaternary alkylammonium compound (R4NX), a silicon compound and an aluminum compound, the various compounds being present in the following molar ratios expressed in moles of the oxides: M2O : SiO2 = 0.01 - 0.35, (R4N)2O : SiO2 = 0.07 - 0.15, H2O : SiO2 = 8 - 12, and Al2O3 : SiO2 < 0.1, is maintained at elevated temperature until the crystalline silicate has been formed. The silicate is separated from the mother liquor and calcined. After calcination during 1 hour in air at 500 DEG C, the X-ray powder diffraction pattern shows as the strongest ones the following four lines: Process for the production of an aromatic hydrocarbon mixture using this silicate as catalyst.