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US 5,288,391 AGranted
Rendering oily wastes landtreatable or usable
AssigneeExxon Research & Engineering Co.
InventorOmer Biceroglu
Life of this patent
Estimating the term…
Abstract
A process for deoiling wastes is disclosed. The process is integrated with a refinery and utilizes a refinery intermediary hydrocarbon stream as a solvent to recover waste oil for reprocessing in the refinery and to produce waste solids, which are either reused or disposed for landtreatment.
Claims7
A process for deoiling an oily sludge produced in a refinery, consisting essentially of the following steps:
- (a) in an extraction zone, mixing the sludge with a solvent comprising a distillate stream from a refinery unit, which solvent comprises 40 to 75 percent by weight aromatics and has a boiling point of 100.degree. to 600.degree. C., wherein the sludge to solvent ratio in the extraction zone is about 2:1 to 1:5, whereby oil components of the sludge are extracted into the solvent;
- (b) in a separation zone, separating the mixture formed in the extraction zone into at least two streams:
- a first stream comprising solvent and extract, and a second stream comprising substantially all of the solid material in said sludge;
- (c) repeating steps (a) and (b) if further reduction in the oil content of the sludge is desired;
- (d) in a combustion zone, employing the solid material produced in step (b) as a source of fuel;
- and
- (e) blending the first stream from step (b) with crude oil for reprocessing in the refinery.
4 more elements
A process for deoiling an oily sludge produced in a refinery, consisting essentially of the following steps:
- (a) in an extraction zone, mixing the sludge with a solvent comprising a distillate stream from a refinery unit, which solvent comprises at least 20 percent by weight aromatics and has a boiling point of 100.degree. to 600.degree. C., wherein the sludge to solvent ratio in the extraction zone is about 2:1 to 1:5, whereby oil components of the sludge are extracted into the solvent;
- (b) in a separation zone, separating the mixture formed in the extraction zone into at least two streams:
- a first stream, comprising solvent and extract, and a second stream comprising substantially all of the solid material in said sludge;
- (c) repeating steps (a) and (b) if further reduction in the oil content of the sludge is desired;
- (d) recovering the first stream from step (b) and recycling at least a portion of said first stream to said refinery for processing in a FCC process unit;
- and
- (e) recovering the second stream from step (b) for use as a fuel or for landtreatment.
4 more elements
A process for deoiling an oily sludge, consisting essentially of the following steps:
- (a) in an extraction zone, mixing the sludge with a solvent comprising a distillate stream from a refinery unit, which solvent comprises 40 to 75 percent by weight aromatics and has a boiling point of 100.degree. to 600.degree. C., wherein the sludge to solvent ratio in the extraction zone is about 2:1 to 1:5, whereby oil components of the sludge are extracted into the solvent;
- (b) in a separation zone, separating the mixture formed in the extraction zone into at least two streams:
- a first stream, comprising solvent and extract, and a second stream comprising substantially all of the solid material in said sludge;
- and
- (c) repeating steps (a) and (b) if further reduction in the oil content of the sludge is desired.
2 more elements
Dependencies are inferred from the claim text.