Process for conversion of gas oil to ethylene and needle coke

Details Process for conversion of gas oil to ethylene and needle coke Process for conversion of gas oil to ethylene and needle coke

1977-12-22

1979-02-06

Davis, C.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

260683R, C10G 3706, C07C 330

Patent

active

041383257

ABSTRACT:
A process for the conversion of gas oil to a naphtha pyrolysis feedstock and needle coke comprising thermally cracking the gas oil to produce a product comprising cracked naphtha and aromatic tar oil, delay coking said aromatic tar oil to produce needle coke and coker naphtha, and hydrotreating said cracked naphtha and said coker naphtha at a temperature at least 50.degree. F. (28.degree. C.) lower than the temperature in the thermal cracking and coking zones to avoid hydrocarcking reactions and to produce a hydrogenated naphtha containing at least 10 volume percent of cycloparaffins. Said hydrogenated naphtha is thereupon passed through a pyrolysis zone without added molecular hydrogen and without a catalyst operated at a temperature between 1,300 and 2,300.degree. F. (704 and 1,260.degree. C.) and a residence between 0.05 and 2 seconds to produce a product containing ethylene. The ethylene yield can be increased by adding a sulfur compound to the hydrogenated naphtha stream flowing to the pyrolysis zone.

REFERENCES:
patent: 3556987 (1971-01-01), Zimmerman et al.
patent: 3617495 (1971-11-01), Zimmerman et al.
patent: 3839484 (1974-10-01), Zimmerman et al.
patent: 3878088 (1975-04-01), Nahas et al.
patent: 4039429 (1977-08-01), Klinken et al.
patent: 4061562 (1977-12-01), McKinney et al.

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