Nippon Mining Co., Ltd.

Hitachi, Ltd.

Yoshihito Satomi

Tomohiko Miyamoto

Susumu Yoshioka

Jinichi Tomuro

Teruo Suzuka

Seiichi Uchida

Takeo Yamagata

Norihiro Kiuchi

Shirou Aizawa

Mamoru Yamane

Kuniaki Fujimori

Hiromi Ozaki

Mizuho Hirato

Toshinobu Miyake

In a reactor for cracking heavy hydrocarbon oil through a fluidized bed of the particles of natural ores, coke-like materials are deposited on a top of the reactor or pipe inside surfaces of a transfer line from the reactor to a scrubber. To effectively scour out the deposited coke-like materials, particles of natural ores having a mean diameter of a few hundred .mu.m is made to be contained in an effluent gas from the top of reactor, passing through the transfer line at a concentration of 1 to 40 g/m.sup.3. The particles of natural ores have a good effect of scouring out the deposited coke-like materials and can keep the transfer line efficiently clean even with a small amount of the particles of natural ores, decreasing a pressure drop in the transfer line.

Apparatus for preventing coking in fluidized bed reactor for cracking

A process for producing a cracked distillate and hydrogen from a heavy oil which comprises cracking the heavy oil in the presence of laterite or a laterite-containing catalyst while simultaneously depositing coke on said laterite or laterite-containing catalysts, reducing the laterite or laterite-containing catalyst on which the coke is deposited, and forming a hydrogen-rich gas by contacting the reduced laterite or laterite-containing catalyst with steam.

Process for producing cracked distillate and hydrogen from heavy oil

In a reactor for cracking heavy hydrocarbon oil through a fluidized bed of particles of natural ores, coke-like materials are deposited on a top of the reactor or pipe inside surfaces of a transfer line from the reactor to a scrubber. To effectively scour out the deposited coke-like materials, particles of natural ores having a mean diameter of a few hundred .mu.m is made to be contained in an effluent gas from the top of reactor, passing through the transfer line at a concentration of 1 to 40 g/m.sup.3. The particles of natural ores have a good effect of scouring out the deposited coke-like materials and can keep the transfer line efficiently clean even with a small amount of the particles of natural ores, decreasing a pressure drop in the transfer line.

Method for preventing coking in fluidized bed reactor for cracking heavy

A catalyst suitable for cracking heavy oils can be obtained by baking nickel-containing ore at a temperature between about 850.degree. C and about 1200.degree. C.

Catalyst for treating heavy oils

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Kurashiki, Japan

Yoshihito Satomi