초록 ▼

A two stage hydrocracking process is characterized by operation of the second hydrocracking zone at a reduced pressure, which is conducive to cracking the highly paraffinic effluent of the first hydrocracking zone. The process is also characterized by the passage of the partially compressed hydrogen

A two stage hydrocracking process is characterized by operation of the second hydrocracking zone at a reduced pressure, which is conducive to cracking the highly paraffinic effluent of the first hydrocracking zone. The process is also characterized by the passage of the partially compressed hydrogen makeup gas stream into the second hydrocracking zone followed by compressing the gas recovered from the second hydrocracking zone effluent to form the makeup gas to the first stage hydrocracking zone. There is no recycle gas stream for the second hydrocracking zone.

대표청구항 ▼

[ We claim as our invention:] [1.]1. A two stage hydrocracking process, which process comprises:(a) passing hydrogen and a feed stream comprising hydrocarbons having boiling points above 700.degree. F. into a first hydrocracking zone operated at hydrocracking conditions including a first pressure an

[ We claim as our invention:] [1.]1. A two stage hydrocracking process, which process comprises:(a) passing hydrogen and a feed stream comprising hydrocarbons having boiling points above 700.degree. F. into a first hydrocracking zone operated at hydrocracking conditions including a first pressure and containing a hydrocracking catalyst and producing a first hydrocracking zone effluent stream comprising hydrogen, hydrogen sulfide, unconverted feed components and product hydrocarbons;(b) separating the first hydrocracking zone effluent to yield a recycle gas stream and a first liquid process stream, which liquid process stream is passed into a product fractionation zone producing a distillate product stream and a bottoms stream comprising unconverted feed components;(c) passing the bottoms stream and a makeup hydrogen gas stream into a second hydrocracking zone operated at paraffin selective hydrocracking conditions which include a lower second pressure, and producing a second hydrocracking zone effluent stream;(d) separating the second hydrocracking effluent stream into a vapor phase stream and a liquid phase stream, and passing the liquid phase stream into the product fractionation zone; and(e) compressing the vapor phase stream and passing the vapor phase stream into the first hydrocracking reaction zone as a makeup gas stream.