Patent ID: 8362183

Claim:
A process to make light olefins from a halogenide-containing or sulphur-containing organic feedstock comprising: contacting said halogenide-containing or sulphur-containing organic feedstock in a primary reactor with a catalyst comprising a metalloaluminophosphate (MeAPO) molecular sieve at conditions effective to convert at least a portion of the feedstock to form a first reactor effluent comprising light olefins and a heavy hydrocarbon fraction; separating said light olefins from said heavy hydrocarbon fraction; contacting said heavy hydrocarbon fraction in a second reactor at conditions effective to convert at least a portion of said heavy hydrocarbon fraction to light olefins; wherein said MeAPO molecular sieve has an empirical chemical composition on an anhydrous basis, after synthesis and calcination, expressed by the formula H x Me y Al z P k O 2 in which, y+z+k=1, x is less than or equal to y, y has a value ranging from 0.0008 to 0.4, z has a value ranging from 0.25 to 0.67, k has a value ranging from 0.2 to 0.67; said MeAPO molecular sieve having predominantly a plate crystal morphology having a width (W) and a thickness (T) wherein W/T is greater than or equal to 10.