Mineral oils: processes and products – Paraffin wax; treatment or recovery – Separation of paraffin from oil
Patent
1993-04-23
1994-10-25
Lieberman, Paul
Mineral oils: processes and products
Paraffin wax; treatment or recovery
Separation of paraffin from oil
208 37, 208 38, 585818, 585819, 21050039, 210654, C10G 7306, C10G 7332, B01D 3900, C07C 7144
Patent
active
053586255
ABSTRACT:
A process for solvent dewaxing a waxy oil feed to produce a lubricating oil by contacting a warm waxy oil feed in counter-current with a cold oil/solvent filtrate stream through a selectively permeable membrane to transfer cold solvent through the membrane to the feed and simultaneously cool the feed, dilute it with solvent and separate solvent from the cold oil/solvent filtrate stream. The cooled, diluted feed stream is then further cooled to precipitate the wax to form an oil/solvent/wax mixture which is further diluted with cold solvent and filtered to remove wax. The cold oil/solvent filtrate stream is cycled to the selectively permeable membrane for the counter-current contact with the warm waxy oil feed and, after removal of a portion of the solvent over the membrane, is sent to an oil/solvent separation operation in which the solvent is removed from the dewaxed oil.
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Hailey Patricia L.
Keen Malcolm D.
Lieberman Paul
McKillop Alexander J.
Mobile Oil Corporation
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