Two-stage catalytic hydroconversion of hydrocarbon...

Details Two-stage catalytic hydroconversion of hydrocarbon... Two-stage catalytic hydroconversion of hydrocarbon...

C - Chemistry, Metallurgy

10

G

196/119

C10G 47/00 (2006.01) C10G 65/10 (2006.01)

Patent

CA 1229570

ABSTRACT OF DISCLOSURE A two-stage catalytic hydroconversion process for heavy hydrocarbon feedstocks usually containing fine particulate solids to produce lower boiling hydrocarbon liquid and gas products. The feedstock is fed into a first stage ebullated bed reactor containing fine sized catalyst and operated at moderate reaction conditions for hydroconversion to produce hydrocarbon gas and liquid fractions, from which a low boiling liquid fraction is separated and withdrawn as a product. The remaining gas and heavier liquid fractions are recombined and fed to a second stage ebullated bed reactor containing larger size catalyst for further hydroconversion reactions at less severe conditions to produce lower boiling hydrocarbon liquid fractions. Following product distilla- tion steps, liquid product fractions are withdrawn and a portion of vacuum bottoms material is recycled to the second stage reactor to provide increased hydroconversion and improved yields of the light hydrocarbon liquid product.

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