Rejuvenating SAPO molecular sieve by freeze drying
AssigneeExxonMobil Chemical Patents Inc.
InventorsMarcel J. G. Janssen, Cornelis W. M. Van Oorschot, Kenneth R. Clem
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Abstract
Disclosed is a method of rejuvenating molecular sieve and molecular sieve catalyst. The method includes freeze drying a molecular sieve having a methanol conversion ratio of less than 1, or a catalyst containing molecular sieve and a binder having a methanol conversion ratio of less than 1. The rejuvenated molecular sieve or catalyst is used to make an olefin product from an oxygenate. The olefin product containing ethylene and propylene can then be used to make polyethylene and polypropylene, respectively.
Claims11
A method of making an olefin product from an oxygenate comprising:
- providing molecular sieve containing catalyst having a methanol uptake index of less than 1;
- freeze drying the molecular sieve containing catalyst until the methanol uptake index is increased by at least 10%;
- and
- contacting the freeze dried molecular sieve containing catalyst with an oxygenate to produce olefin product.
Dependencies are inferred from the claim text.