A method is disclosed for synthesizing zincoaluminosilicate molecular sieve SSZ-41 having high aluminum content from a combined source of silicon oxide and aluminum oxide selected from one or more a FAU framework type zeolite and a colloidal aluminosilicate.

Systems and methods for processing a C.sub.3 and C.sub.4 hydrocarbon mixture have been disclosed. The C.sub.3 and C.sub.4 hydrocarbon mixture is separated to remove propane from C.sub.4 hydrocarbons. The resulting C.sub.4 hydrocarbons are then processed in an isomerization unit to produce additional isobutane. The isobutane of the isomerization unit effluent is dehydrogenated in a dehydrogenation unit to produce isobutene. The resulting isobutene is reacted with an alkanol to produce an alkyl tert-butyl ether.