Hydrocracking product recovery process
AssigneeUop LLC
InventorWilliam H. Munro
Life of this patent
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Abstract
The recovery of distillate products from a hydrocracking process includes passing the liquid-phase portion of the reaction zone effluent into a stripping column. A naphtha sidecut stream is recovered off the stripping column and combined with the net overhead liquid of the column. These combined streams are then combined with the naphtha recovered from the primary product recovery column. This minimizes the hydrogen sulfide present in the total naphtha product.
Claims15
A process for recovering the distillate products obtained by processing feed hydrocarbons chosen from the group consisting of straight run gas oils, vacuum gas oils, demetallized oils, deasphalted vacuum residue, coker distillates, cat cracker distillates, shale oil, tar sand oil and coal liquids in a hydrocracking process, which process comprises the steps of:
- a) passing a liquid-phase stream comprising both (1) hydrogen sulfide and (2) hydrocarbons, which stream has been recovered from the effluent of a hydrocracking reaction zone, into a first stripping column operated at conditions effective to separate the entering liquid phase stream into a first net overhead liquid stream comprising hydrogen sulfide and naphtha boiling range product hydrocarbons, a net overhead vapor stream comprising hydrogen sulfide and a first net bottoms stream comprising unconverted feed hydrocarbons and middle distillate boiling range product hydrocarbons boiling between 149.degree.-371.degree. C.;
- b) removing a first sidecut stream, which comprises naphtha boiling range product hydrocarbons, from the stripping column, and;
- c) passing the first net bottoms stream into a product recovery column operated at conditions effective to separate the entering hydrocarbons into a second net bottoms stream comprising unconverted feed hydrocarbons, a second sidecut stream, which comprises middle distillate hydrocarbons having boiling points between 149.degree.-371.degree. C., and a second net overhead liquid stream, which comprises naphtha boiling range hydrocarbons, and recovering naphtha boiling range hydrocarbons as a product.
A process for recovering the distillate products obtained by processing feed hydrocarbons having boiling points between 160.degree. and about 443.degree. C. in a hydrocracking process, which process comprises the steps of:
- a) passing a liquid-phase stream comprising both (1) hydrogen sulfide and (2) hydrocarbons, which have both been recovered from the effluent of a hydrocracking reaction zone into a first stripping column operated at conditions effective to separate the entering liquid phase stream into a first net overhead liquid stream comprising hydrogen sulfide and naphtha boiling range product hydrocarbons, a net overhead vapor stream comprising hydrogen sulfide and a first net bottoms stream comprising unconverted feed hydrocarbons and middle distillate boiling range product hydrocarbons having boiling points between 149.degree.-371.degree. C.;
- b) removing a first sidecut stream, which comprises naphtha boiling range product hydrocarbons, from the first stripping column, and;
- c) passing the first net bottoms stream into a product recovery column operated at conditions effective to separate the entering hydrocarbons into a second net bottoms stream comprising unconverted feed hydrocarbons, a second sidecut stream, which comprises middle distillate hydrocarbons having boiling points between 149.degree.-371.degree. C., and a second net overhead liquid stream, which comprises naphtha boiling range hydrocarbons;
- d) passing the first net overhead stream, the first sidecut stream and the second net overhead stream into a second stripping column operated to separate the entering hydrocarbons into a net overhead stream comprising propane and a third net bottoms stream which comprises naphtha boiling range hydrocarbons, and recovering naphtha boiling range hydrocarbons as a product.
Dependencies are inferred from the claim text.