Mineral oils: processes and products – Refining – Purifying used oil
Patent
1980-10-28
1982-08-03
Tufariello, T. M.
Mineral oils: processes and products
Refining
Purifying used oil
208355, C10M 1100, C10G 706
Patent
active
043426450
ABSTRACT:
Used oil is refined by distillation to remove a volatile forecut followed by further distillation with recirculation provisions to obtain the desired fractions of lubricating oil products while reducing the vaporization temperature of the oil. The recycle effect tends to reduce coking and cracking while providing a greater recovery of lubricating oil products through the carrier effect of the light ends.
In one embodiment of the invention, a waste oil feedstock has water, gasoline and other similarly volatile components removed in a first stage evaporator (16). Heavier fuel, such as fuel oil is then removed in a second stage evaporator (28). A light lube oil fraction is then obtained by distillation with a third stage wiped-film evaporator (40). Finally, a heavy lube oil fraction is obtained by distillation of the bottoms from the evaporator (40) with a fourth-stage evaporator (64).
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Beard Harold J.
Fletcher Laird C.
Delta Central Refining, Inc.
Tufariello T. M.
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