FINE MAGNETIC PARTICLE-CONTAINING STOCK OIL SUPPLY SYSTEM

WIPO Patent Application WO/1994/011463

A1

This invention relates to a stock oil pretreatment supply system adapted to supply heavy petroleum stock oil to a hydrogenator. In order to remove fine iron particles of not larger than 25 mu, which cannot be removed by the conventional techniques, from stock oil, a system consisting of a heater for heating the stock oil to a predetermined temperature by conducting heat exchange between the stock oil and a high-temperature hydrogenated oil at the bottom of a fractionating tower, a back washer-carrying solid filter for the heated stock oil, and a high-gradient magnetic separator for magnetically separating fine magnetic iron particles of not larger than 25 mu from the stock oil is formed, in which the bottom oil in the fractionating tower is used as a magnetic separator cleaning oil. The fine iron particles could be removed from the stock oil by repeating the iron removing operation and cleaning operation. This pretreatment supply system enables the iron particles, which cause a catalyst layer in the hydrogenator to be closed and deteriorated, to be reduced, and the length of time during which a conventional hydrogenator can be operated continuously to be increased.

OKAZAKI HAJIME (JP)
KAZATO MANABU (JP)
OUCHI MASAOKI (JP)
NAGANO HARUKI (JP)
USHIO MASARU (JP)
KAMIYA KOZO (JP)

PCT/JP1993/001634

May 26, 1994

November 10, 1993

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NIPPON OIL CO LTD (JP)
NIPPON PETROLEUM REFINING CO (JP)
OKAZAKI HAJIME (JP)
KAZATO MANABU (JP)
OUCHI MASAOKI (JP)
NAGANO HARUKI (JP)
USHIO MASARU (JP)
KAMIYA KOZO (JP)

C10G32/02; C10G45/02; C10G47/00; C10G67/02; C10G67/14; (IPC1-7): C10G32/02

JPS5688492A	1981-07-17
JPS6254790A	1987-03-10
US4298456A	1981-11-03

See also references of EP 0626440A4

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