Recycled zeolite l preparation

Details Recycled zeolite l preparation Recycled zeolite l preparation

C - Chemistry, Metallurgy

01

B

252/15

C01B 39/46 (2006.01) B01J 29/60 (2006.01) C01B 39/32 (2006.01)

Patent

CA 1238032

ABSTRACT RECYCLED ZEOLITE L PREPARATION Zeolite L is prepared in a process employing a mother liquor recycle by adjusting the alkalinity of the crystallization gel contianing the mother liquor to suppress zeolite W formation and optionally heat treating the mother liquor prior to recycle to remove zeolite W nuclei and/or crystallites. The technique is especially suitable for the formation of zeolite L with cylindrical morphology from a crystallization gel comprising (in mole ratios of oxides): K2O/SiO2 0.22 - 0.36 H2O/K2O 25 - 90 SiO2/Al2O3 6 - 15 The cylindrical Zeolite L may be used as a catalyst base in aromatization of acyclic hydrocarbons with high benzene yields being sustained over commercially feasible periods.

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