Protecting catalytic activity of a SAPO molecular sieve

Details Protecting catalytic activity of a SAPO molecular sieve Protecting catalytic activity of a SAPO molecular sieve

2003-07-09

2008-03-18

Caldarola, Glenn (Department: 1797)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

From nonhydrocarbon feed

C585S639000, C585S638000, C585S906000, C502S214000, C502S439000, C502S514000

Reexamination Certificate

active

07345213

ABSTRACT:
This invention is directed to a method of making an olefin product from an oxygenate feedstock and a method of protecting catalytic activity of a silicoaluminophosphate molecular sieve. The methods comprise providing a silicoaluminophosphate molecular sieve having catalytic sites within the molecular sieve; shielding the catalytic sites to protect from loss of catalytic activity; and contacting the protected sieve in its activated state with an oxygenate feedstock under conditions effective to produce an olefin product before undesirable loss of catalytic activity. Undesirable loss in catalytic activity occurs when activated molecular sieve contacting the oxygenate feedstock has a methanol uptake index of at least 0.15.

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