Process for thermally cracking heavy hydrocarbon oil

Details Process for thermally cracking heavy hydrocarbon oil Process for thermally cracking heavy hydrocarbon oil

Filed on

1985-06-24

Date issued

1986-04-08

Examiner

Metz, Andrew H.

Patent Class

Mineral oils: processes and products

SubClass

Chemical conversion of hydrocarbons

SubSubClass

Plural serial stages of chemical conversion

Other Related Categories

208 48R, 208 75, 208 67, 208 39, C10G 916, C10G 914, C10G 5102

Type

Patent

Status

active

Patent number

045811245

Description

ABSTRACT:
A continuous process for thermally cracking a heavy hydrocarbon oil, including heat-treating the heavy hydrocarbon oil in a first thermal cracking zone for obtaining a first cracked product, and introducing the first cracked product into a second thermal cracking zone where it is thermally cracked by direct contact with a gaseous heat transfer medium to form distillable cracked components and a mesophase-containing pitch. The liquid phase in the second thermal cracking zone, including the mesophase-containing pitch, is withdrawn therefrom and separated into a mesophase-rich pitch and a matrix pitch having a low concentration of mesophase. The matrix pitch is recycled to the second thermal cracking zone. The distillable cracked components are stripped from the liquid phase in the second thermal cracking zone with the heat transfer medium, and the resulting gas phase is discharged overhead therefrom and then separated into a light fraction and a heavy fraction. The heavy fraction is fed to a third thermal cracking zone to obtain light oil components and an aromatic tar. The aromatic tar is recycled to the second thermal cracking zone.

REFERENCES:
patent: 2063505 (1936-12-01), Huff
patent: 2234910 (1941-03-01), Barron
patent: 2247740 (1941-07-01), Angell
patent: 3065165 (1962-11-01), Amis et al.
patent: 3928170 (1975-12-01), Takahashi et al.
patent: 4178228 (1979-12-01), Chang
patent: 4264432 (1981-04-01), Gartside
patent: 4477334 (1984-10-01), Gomi et al.
patent: 4487686 (1984-12-01), Gomi et al.

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