The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 2004
Filed:
Jul. 26, 2002
Marcel J. G. Janssen, Kessel-Lo/Leuven, BE;
Cornelius W. M. Van Oorschot, Brasschaat, BE;
Shun C. Fung, Bridgewater, NJ (US);
Luc R. M. Martens, Meise, BE;
Wilfried J. Mortier, Kessel-Lo, BE;
Ronald G. Searle, Houston, TX (US);
Machteld M. Mertens, Boortmeerbeek, BE;
Stephen N. Vaughn, Kingwood, TX (US);
ExxonMobil Chemical Patents Inc., Houston, TX (US);
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.