Dewaxing process using zeolites MTT and MTW

Abstract

The present invention relates to the use of a combination of zeolites having the MTT and MTW framework topologies defined by the connectivity of their tetrahedral atoms wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron 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 MTW framework topologies defined by the connectivity of their tetrahedral atoms wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron.  
     
     
         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 . 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 MTW framework topologies defined by the connectivity of their tetrahedral atoms wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron.  
     
     
         7 . The process of  claim 6  wherein the zeolites are predominantly in the hydrogen form.  
     
     
         8 . The process of  claim 6  wherein the catalyst further comprises at least one Group VIII metal.  
     
     
         9 . 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 MTW framework topologies defined by the connectivity of their tetrahedral atoms wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron.  
     
     
         10 . The process of  claim 9  wherein the zeolites are predominantly in the hydrogen form.  
     
     
         11 . The process of  claim 9  wherein the catalyst further comprises at least one Group VIII metal.  
     
     
         12 . A process for catalytically dewaxing a hydrocarbon oil feedstock boiling above about 350° F. 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 MTW framework topologies defined by the connectivity of their tetrahedral atoms wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron.  
     
     
         13 . The process of  claim 12  wherein the zeolites are predominantly in the hydrogen form.  
     
     
         14 . The process of  claim 12  wherein the catalyst further comprises at least one Group VIII metal.  
     
     
         15 . 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 MTW framework topologies defined by the connectivity of their tetrahedral atoms wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron.  
     
     
         16 . The process of  claim 15  wherein the zeolites are predominantly in the hydrogen form.  
     
     
         17 . The process of  claim 15  wherein the catalyst further comprises at least one Group VIII metal.  
     
     
         18 . The process of  claim 15  wherein the raffinate is bright stock.  
     
     
         19 . 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. with a catalyst system comprising a combination of a zeolite having MTT topology and a zeolite having MTW topology wherein the MTT and MTW zeolites have a crystal size less than 0.1 micron., and wherein at least a portion of said feedstock is converted.  
     
     
         20 . The process of  claim 19  wherein the catalyst system further comprises a hydrogenation component.  
     
     
         21 . The process of  claim 19  wherein the cloud point of the feedstock is reduced to not more than 10° C.  
     
     
         22 . The process of  claim 20  wherein the hydrogenation component comprises a Group VIII metal.  
     
     
         23 . The process of  claim 22  wherein the Group VIII metal is selected from platinum, palladium and mixtures thereof.  
     
     
         24 . The process of  claim 19  wherein the process is a dewaxing process and wherein the contacting is conducted under dewaxing conditions.  
     
     
         25 . The process of  claim 19  wherein the hydrocarbon oil is bright stock.  
     
     
         26 . The process of  claim 19  wherein the hydrocarbon oil is derived from a Fischer-Tropsch wax.  
     
     
         27 . The process of  claim 19  wherein the process is conducted in the presence of added hydrogen gas.  
     
     
         28 . The process of  claim 19  wherein the MTT and MTW zeolites are aluminosilicates.  
     
     
         29 . The process of  claim 19  wherein the MTT and MTW zeolites have a crystal size less than about 0.1 micron.