Mineral oils: processes and products – Paraffin wax; treatment or recovery – Separation of paraffin from oil
Patent
1994-07-25
1995-12-12
Pal, Asok
Mineral oils: processes and products
Paraffin wax; treatment or recovery
Separation of paraffin from oil
208 35, C10G 7306
Patent
active
054746680
ABSTRACT:
A process for dewaxing including the steps of mixing a waxy feedstock near its pour point with an ambient or below ambient temperature solvent essentially free of a selected cosolvent, to form a solvent/feedstock mixture, essentially free of a selected cosolvent, and subsequently adding the cosolvent to the solvent/feedstock mixture to cause instantaneous precipitation of wax on addition of cosolvent with the amount of wax precipitation being controlled by the quantity and temperature of cosolvent added. The cosolvent is essentially completely miscible with the solvent, but immiscible with the oil and wax. For example, alcohols (methanol, ethanol, propanol), ketones (ketene, acetone), amines, etc. The process of the present invention provides the advantages of lower solvent ratios (higher solvent recovery), higher filtration temperatures, "environmentally compatible" solvents, rapid filtration rates, and debottlenecking of existing dewaxing plants.
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Ackerson Michael D.
Arabshahi Seyed-Hamid
Babcock Robert E.
Advanced Refining Technologies, Inc.
Alexander Daniel R.
Pal Asok
University of Arkansas
Yildirim Bekir L.
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