Patent ID: 6403853
Filing Date: 2002-06-11
Classification: B01J,C07C

Abstract:
A process for oligomerizing an olefinic feed, the process comprising:a) providing a catalyst comprising a crystalline silicon aluminophosphate molecular sieve characterized by a 3-dimensional framework structure type of SAPO-11 or SAPO-41 and having a chemical composition on an anhydrous basis expressed by an empirical formula of: (SixAlyPz)O2 â€ƒwhere â€œxâ€  is the mole fraction of Si and has a value of at least 0.005; â€œyâ€  is the mole fraction of Al and has a value of at least 0.01; â€œzâ€  is the mole fraction of P and has a value from greater than 0 to about 0.6; the molecular sieve having been washed at washing conditions with a strong acid having a pKa of less than 2.0, and; b) contacting the light olefin feed with the catalyst at oligomerization conditions to yield a higher olefin product.