Patent ID: 7772335
Filing Date: 2010-08-10
Classification: B01J,C01B,C07C,C08F,Y02P

Abstract:
1. A method for converting an oxygenated hydrocarbon feedstock into an olefin product comprising: (a) forming an aluminosilicate molecular sieve catalyst having a CHA framework type, which is made from a synthesis mixture comprising a silicon source, an aluminum source, a slurry medium, and a structure directing agent, wherein the synthesis mixture is substantially free from fluorine atoms, wherein the molecular sieve is substantially free of framework phosphorus and exhibits an x-ray diffraction pattern having at least the following peaks: and wherein the molecular sieve exhibits a Si/Al ratio from about 40 to about 60; (b) optionally formulating the molecular sieve catalyst with an oxidized aluminum-containing precursor matrix material and a clay binder to form a molecular sieve catalyst composition, wherein the composition comprises from about 20% to about 60% by weight of the molecular sieve catalyst, and wherein the molecular sieve, the molecular sieve composition, or both have an attrition resistance index not greater than about 1.5 wt %/hr; (c) activating the molecular sieve catalyst by removing and/or decomposing the structure directing agent; and (d) contacting the activated molecular sieve catalyst with an oxygenated hydrocarbon feedstock under conditions sufficient to form an olefin product comprising ethylene and propylene in a combined amount of at least about 65% by weight of the olefin product, on a water-free basis, and wherein the olefin product has an ethylene-to-propylene ratio of at least about 1.2 by weight, based on the weight of the product from the contacting.