(19)
(11) EP 0 188 898 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.06.1988 Bulletin 1988/23

(43) Date of publication A2:
30.07.1986 Bulletin 1986/31

(21) Application number: 85309273

(22) Date of filing: 19.12.1985
(84) Designated Contracting States:
BE DE FR GB IT NL

(30) Priority: 21.12.1984 US 685089
21.12.1984 US 685000
21.12.1984 US 685001
29.05.1985 US 738818

(71) Applicant: MOBIL OIL CORPORATION
 ()

(72) Inventors:
  • Chen, Nai Yuen
     ()
  • Yen, Jeffrey Hsing-Gan
     ()
  • Huang, Tracy Jau-Hau
     ()

   


(54) Cascade dewaxing process


(57) Hydrocarbon feedstocks are dewaxed in a cascade process by contacting a waxy feedstock with a large pore crystalline zeolite catalyst and then with a medium pore crystalline zeolite catalyst. Preferably both contactings are performed in the presence of added hydrogen, each zeolite being associated with a hydrogenation/dehydrogenation component: the first contacting may function as a hydroisomerisation step. In certain applications as preferred large pore zeolite is zeolite beta. In certain applications a preferred medium pore zeolite is ZSM-11. Some degree of interstage separation can be adopted.






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