Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1985-03-20
1987-11-24
Chaudhuri, Olik
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208159, 502 43, C10G 1118
Patent
active
047087854
ABSTRACT:
Heat balance in a residual oil conversion unit can be controlled as a function of Conradson carbon of the feed, water added to the feed, hydrogen in the coke produced, CO.sub.2 /CO ratio, etc. Preferably, riser outlet temperature can be controlled to less than about 538.degree. C. (1000.degree. F.) at CO.sub.2 /CO flue gas ratios of 3/1 or less. Especially preferred are operations in a two-stage regenerator with cracking catalyst comprising at least 5000 ppm of Ni+V and residual carbon on regenerated catalyst of at least 0.1 wt. %. The contact time in the second stage of the regenerator being less than about 1/2 of that employed in the first stage, and with oxygen-lean gas being employed in the first stage. The heat transferred by the catalyst to the residual oil feed is preferably limited to about 500 to 1200 btu per pound of oil feed.
REFERENCES:
patent: 4009121 (1977-02-01), Luckenbach
patent: 4332673 (1982-06-01), Myers
Ashland Oil Inc.
Chaudhuri Olik
Willson, Jr. Richard C.
Wilson James L.
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