Dewaxing process using zeolites MTT and GON

Abstract

The present invention relates to the use of a combination of zeolites having the MTT and GON framework topologies defined by the connectivity of their tetrahedral atoms as a catalyst in a process for dewaxing hydrocarbon feedstocks.

1 . A dewaxing process comprising contacting a hydrocarbon feedstock under dewaxing conditions with a catalyst comprising a combination of zeolites having the MTT and GON framework topologies defined by the connectivity of their tetrahedral atoms.  
   
   
       2 . The process of  claim 1  wherein the zeolites are predominantly in the hydrogen form.  
   
   
       3 . The process of  claim 1  wherein the catalyst further comprises at least one Group VIII metal.  
   
   
       4 . The process of  claim 1  wherein the feedstock is bright stock.  
   
   
       5 . The process of  claim 1  wherein the feedstock is derived from a Fischer Tropsch process.  
   
   
       6 . The process of  claim 1  wherein the MTT and GON zeolites have a crystal size less than 0.1 micron.  
   
   
       7 . A process for improving the viscosity index of a dewaxed product of waxy hydrocarbon feeds comprising contacting a waxy hydrocarbon feed under isomerization dewaxing conditions with a catalyst comprising a combination of zeolites having the MTT and GON framework topologies defined by the connectivity of their tetrahedral atoms.  
   
   
       8 . The process of  claim 7  wherein the zeolites are predominantly in the hydrogen form.  
   
   
       9 . The process of  claim 7  wherein the catalyst further comprises at least one Group VIII metal.  
   
   
       10 . A process for producing a C 20+  lube oil from a C 20+  olefin feed comprising isomerizing said olefin feed under isomerization conditions over a catalyst comprising a combination of zeolites having the MTT and GON framework topologies defined by the connectivity of their tetrahedral atoms.  
   
   
       11 . The process of  claim 10  wherein the zeolites are predominantly in the hydrogen form.  
   
   
       12 . The process of  claim 10  wherein the catalyst further comprises at least one Group VIII metal.  
   
   
       13 . A process for catalytically dewaxing a hydrocarbon oil feedstock boiling above about 350° F. (177° C.) and containing straight chain and slightly branched chain hydrocarbons comprising contacting said hydrocarbon oil feedstock in the presence of added hydrogen gas at a hydrogen pressure of about 15-3000 psi under dewaxing conditions with a catalyst comprising a combination of zeolites having the MTT and GON framework topologies defined by the connectivity of their tetrahedral atoms.  
   
   
       14 . The process of  claim 13  wherein the zeolites are predominantly in the hydrogen form.  
   
   
       15 . The process of  claim 13  wherein the catalyst further comprises at least one Group VIII metal.  
   
   
       16 . A process for isomerization dewaxing a raffinate comprising contacting said raffinate in the presence of added hydrogen under isomerization dewaxing conditions with a catalyst comprising a combination of zeolites having the MTT and GON framework topologies defined by the connectivity of their tetrahedral atoms.  
   
   
       17 . The process of  claim 16  wherein the zeolites are predominantly in the hydrogen form.  
   
   
       18 . The process of  claim 16  wherein the catalyst further comprises at least one Group VIII metal.  
   
   
       19 . The process of  claim 16  wherein the raffinate is bright stock.  
   
   
       20 . A process for reducing the cloud point of a hydrocarbon feed comprising contacting a hydrocarbon oil feedstock which has a major portion boiling over 1000° F. (538° C.) with a catalyst system comprising a combination of a zeolite having MTT topology and a zeolite having GON topology, wherein at least a portion of said feedstock is converted.  
   
   
       21 . The process of  claim 20  wherein the catalyst system further comprises a hydrogenation component.  
   
   
       22 . The process of  claim 20  wherein the cloud point of the feedstock is reduced to not more than 10° C.  
   
   
       23 . The process of  claim 21  wherein the hydrogenation component comprises a Group VIII metal.  
   
   
       24 . The process of  claim 23  wherein the Group VIII metal is selected from platinum, palladium and mixtures thereof.  
   
   
       25 . The process of  claim 20  wherein the process is a dewaxing process and wherein the contacting is conducted under dewaxing conditions.  
   
   
       26 . The process of  claim 20  wherein the hydrocarbon oil is bright stock.  
   
   
       27 . The process of  claim 20  wherein the hydrocarbon oil is derived from a Fischer-Tropsch wax.  
   
   
       28 . The process of  claim 20  wherein the process is conducted in the presence of added hydrogen gas.  
   
   
       29 . The process of  claim 20  wherein the MTT and GON zeolites are aluminosilicates.  
   
   
       30 . The process of  claim 20  wherein the MTT and GON zeolites have a crystal size less than about 0.1 micron.