Lubricating oil dewaxing with membrane separation

Details Lubricating oil dewaxing with membrane separation Lubricating oil dewaxing with membrane separation

C - Chemistry, Metallurgy

10

G

C10G 73/22 (2006.01) C10G 73/04 (2006.01) C10G 73/32 (2006.01)

Patent

CA 2251865

A semicontinuous process for solvent dewaxing a waxy petroleum oil feed stream by diluting a waxy oil feed stream (1) with solvent (2), heating the mixed waxy oil/solvent stream to dissolve wax crystals present therein, cooling the mixture to precipitate any wax crystals not soluble in the solvent, filtering the wax crystals from the mixed petroleum oil/solvent stream with a filter (11), contacting the cold filtrate under pressure with a selective premeable membrane (7), so as to selectively permeate the solvent and thereby separate the solvent from the dewaxed petroleum oil, and periodically stopping the permeation process and directing a warm stream of solvent onto the selective permeable membrane surface to wash the membrane and remove impurities therefrom.

Le procédé de la présente invention consiste à introduire l'huile paraffineuse par la ligne (1) et à la mélanger à un solvant méthyléthylcétone/toluène introduit par la ligne (2), puis à introduire le mélange dans un échangeur thermique (3) pour dissoudre tous les cristaux. L'huile paraffineuse introduite par la ligne (101) se mélange directement au solvant puis passe par la ligne (102) pour refroidir le produit. Le procédé se poursuit par un échange thermique indirect dans l'échangeur thermique (9) permettant de refroidir encore plus l'huile paraffineuse refroidie introduite.

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