Patent ID: 6652735
Filing Date: 2003-11-25
Classification: B01J,C10G

Abstract:
A process for isomerization dewaxing of a hydrocarbon feed under superatmospheric hydrogen conditions comprising contacting said hydrocarbon feed with a catalyst system under hydroprocessing conditions, said catalyst system comprising:a) a large pore crystalline molecular sieve having a Constraint Index less than 2, an alpha value less than 100 and an ultimate crystal size of less than 1 micron; and b) an intermediate pore crystalline molecular sieve having a Constraint Index greater than 2, an alpha value less than 100, an ultimate crystal size of less than 1 micron and a unidimensional or a non-intersecting two dimensional pore structure; wherein a dewaxed product having improved fluidity is produced by contacting said hydrocarbon feed with said catalyst system in an order starting with said large pore crystalline molecular sieve followed by said intermediate pore crystalline molecular sieve, and wherein said hydroprocessing conditions are selected to favor the production of dewaxed middle distillate products boiling in the range of about 165Â° C. to about 345Â° C. such that the overall yield of said dewaxed middle distillate products is greater than about 30 wt %.