Rejuvenating SAPO molecular sieve with anhydrous liquid or vapor

The invention is directed to a method of rejuvenating silicoaluminophosphate (SAPO) molecular sieve catalyst, and a method of using the rejuvenated catalyst to make an olefin product from methanol feed. In particular, the invention is directed to rejuvenating the sieve by contacting the molecular si...

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Bibliographic Details
Main Authors Janssen, Marcel J. G, Van Oorschot, Cornelius W. M, Clem, Kenneth R
Format Patent
LanguageEnglish
Published 24.12.2002
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Summary:The invention is directed to a method of rejuvenating silicoaluminophosphate (SAPO) molecular sieve catalyst, and a method of using the rejuvenated catalyst to make an olefin product from methanol feed. In particular, the invention is directed to rejuvenating the sieve by contacting the molecular sieve with anhydrous, polar liquid or vapor until a desired methanol uptake index is achieved. This invention is to a method of rejuvenating a molecular sieve. The method includes contacting a molecular sieve having a methanol uptake index of less than 1, or a catalyst containing molecular sieve having a methanol uptake index of less than 1, with anhydrous liquid or vapor until the methanol uptake index is increased by at least 10%. The rejuvenated molecular sieve or catalyst can be used to make an olefin product from an oxygenate-containing feedstock. The preferred molecular sieve is a silicoaluminophosphate (SAPO) molecular sieve.