Sustained high hydroconversion of petroleum residua feedstocks

Details Sustained high hydroconversion of petroleum residua feedstocks Sustained high hydroconversion of petroleum residua feedstocks

C - Chemistry, Metallurgy

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G

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C10G 47/24 (2006.01) C10G 47/26 (2006.01)

Patent

CA 1238599

ABSTRACT OF DISCLOSURE A process for high hydroconversion of petroleum residua containing at least about 25 V % material boiling above 975°F to produce lower boiling hydrocarbon liquid products and avoid undesirable precipitation of asphaltene compounds. In the process, the feedstock is at least about 80 percent catalytically hydroconverted to material boiling below 975°F and containing a mixture of gas and liquid fractions, after which the gas fraction is removed while maintaining the resulting liquid fractions temperature above about 730°F to avoid precipitation of asphaltene compounds which causes operations difficulties in the downstream equipment. Alternatively, the pressure-reduced liquid fraction can be stripped of material boiling below about 650°F before cooling the liquid to a temperature below about 730°F to prevent such precipitation of asphaltene compounds in the downstream equipment. The resulting liquid fraction is distilled to produce hydrocarbon liquid products, and a vacuum bottoms fraction is recycled to the catalytic reac- tion step to obtain increased percent conversion to lower boiling liquid products.

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