Method for manufacturing zeolite and method for manufacturing epsilon-caprolactam

摘要

Provided is a method for manufacturing a zeolite by effectively using ammonia and/or an ammonium salt collected after a contact processing so that an aqueous solution containing ammonia and an ammonium salt can be repeatedly used. Disclosed is a method for manufacturing a zeolite, comprising the steps of: (1) subjecting a crystal obtained by a hydrothermal synthesis reaction of a silicon compound to a contact processing with an aqueous solution containing ammonia and an ammonium salt; (2) mixing the aqueous solution obtained after the contact processing in the step (1), with at least one selected from the group consisting of ammonia, an ammonium salt, and water, thereby to obtain an aqueous solution containing ammonia and an ammonium salt in which a silicon concentration is adjusted to 100 ppm by weight or less; and (3) recycling the aqueous solution containing ammonia and an ammonium salt obtained in the step (2) into the step (1).