Method of using an aqueous chemical system to recover hydrocarbo

Details Method of using an aqueous chemical system to recover hydrocarbo Method of using an aqueous chemical system to recover hydrocarbo

1989-10-31

1992-02-04

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

134 2219, 134 40, 252170, 252173, 25217421, 25217422, 252DIG1, B08B 908

Patent

active

050857100

ABSTRACT:
Sludge deposited in a crude oil storage tank is treated with a warm-water based nonionic surfactant to minimize waste and recover hydrocarbon. The process entails draining oil from the storage tank, adding water with a nonionic surfactant, and adding diluent to recover hydrocarbon. The tank contents are heated to 145.degree. F. to 180.degree. F. When no sludge remains on the tank bottom, the diluent layer containing the recovered hydrocarbon can be drained directly into the crude unit, without upsets, and the aqueous layer into the API unit.

REFERENCES:
patent: 3436263 (1969-01-01), Strenkert et al.
patent: 4233174 (1980-11-01), Sheridan
Barnett, Better Ways to Clean Crude Storage Tanks and Desaltens, Hydrocarbon Processing, pp. 82-86 (1980).
Yoshimura, T. et al., A New Chemical Cleaning Method for Sludge Produced in Oil Storage Tanks, Eiron. Eng. Technol. Dep. Shin Nikka Co. Ltd., vol. 24(2), pp. 58-63 (Japan 1980) (Search Answer No. 54).
Barnett, Better Ways to Clean Crude Storage Tanks and Desalters, 60 Hydrocarbon Processing, pp. 82-86 (United States 1980).
Broad, F. W., Studies in Cleaning Techniques, Chemistry Industry, No. 48, pp. 1371-1375 (London 1971).
Inventors Literature Search Report (Search No. 2965 8/17/89).

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