Process for treating oil sludge
First Claim
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1. A process for treating petroleum refinery sludge to produce a solid residue product which process comprises:
- (a) forming a feed-stream of an oily petroleum refinery sludge containing organic solid material boiling about 1000°
F. and water;
(b) pretreating said feed-stream to adjust the water content thereof to between about 5% and about 25%, based upon the total weight of the resulting pre-treated feed-stream;
(c) introducing the resulting pre-treated feed-stream into a thermal sludge drier wherein said pre-treated feed-stream is indirectly heated by a heat transfer medium;
(d) heating said pretreated feed-stream in said drier to a temperature above the boiling point of water and below the temperature at which thermal cracking of said feed-stream occurs;
(e) maintaining the heated feed-stream in a nonoxidative atmosphere in said sludge drier for a time sufficient for said water in said feed-stream to form steam and for said steam to strip any light hydrocarbons from the solid material in said feed-stream to form a solid residue;
(f) separating a hydrocarbon-water vapor stream from said solid material; and
(g) recovering said solid material as a solid residue product having a BTU content between about 3000 and 10,000 BTU/lb.
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Abstract
A process for treating pretroleum refinery sludge to produce a coke-like residue product wherein an oily petroleum refinery sludge containing organic solid material boiling above 1000° F. and water is heated to a temperature above the boiling point of water and below the thermal cracking temperature of hydrocarbons and water in the sludge forms steam used to steam strip any light hydrocarbons from the organic solid material which is recovered as a solid coke-like residue product.
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Citations
9 Claims
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1. A process for treating petroleum refinery sludge to produce a solid residue product which process comprises:
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(a) forming a feed-stream of an oily petroleum refinery sludge containing organic solid material boiling about 1000°
F. and water;(b) pretreating said feed-stream to adjust the water content thereof to between about 5% and about 25%, based upon the total weight of the resulting pre-treated feed-stream; (c) introducing the resulting pre-treated feed-stream into a thermal sludge drier wherein said pre-treated feed-stream is indirectly heated by a heat transfer medium; (d) heating said pretreated feed-stream in said drier to a temperature above the boiling point of water and below the temperature at which thermal cracking of said feed-stream occurs; (e) maintaining the heated feed-stream in a nonoxidative atmosphere in said sludge drier for a time sufficient for said water in said feed-stream to form steam and for said steam to strip any light hydrocarbons from the solid material in said feed-stream to form a solid residue; (f) separating a hydrocarbon-water vapor stream from said solid material; and (g) recovering said solid material as a solid residue product having a BTU content between about 3000 and 10,000 BTU/lb. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification