(19)
(11) EP 0 181 066 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.07.1988 Bulletin 1988/29

(43) Date of publication A2:
14.05.1986 Bulletin 1986/20

(21) Application number: 85306342

(22) Date of filing: 06.09.1985
(84) Designated Contracting States:
BE DE FR GB IT NL

(30) Priority: 29.10.1984 US 665793

(71) Applicant: MOBIL OIL CORPORATION
 ()

(72) Inventor:
  • Varghese, Philip
     ()

   


(54) Process for dewaxing heavy distillates and residual liquids


(57) Process for dewaxing heavy distillate and residual feed. Easily converted waxes are partially removed in a first catalytic dewaxing step, and the resulting product is separated to remove the light ends. The heavy liquid fraction, which contains difficult to convert waxes, such as poly-branched or mid-methyl branched paraffin waxes, is then introduced into a second dewaxing stage, where the liquid stream is dewaxed to a specification pour point. The process may be implemented via double pass dewaxing in existing units or by passing through two consecutive dewaxing units. Improvements are due to a decoupling of temperature requirements in each reaction step and removal of cracked products which inhibit dewaxing and accelerate aging in the second dewaxing stage.





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