Patent ID: 9017547
Filing Date: 2015-04-28
Classification: C10G

Abstract:
1. A process for hydrogenating a feedstream in a hydroprocessing reactor, the feedstream comprising a heavy hydrocarbon liquid component, the reactor also receiving a hydrogen gas input component, the reactor producing a reactor effluent, the process comprising: a. separating the reactor effluent with a high pressure separator into an effluent liquid stream and an effluent gas stream, the effluent gas stream comprising unreacted hydrogen, methane and heavier hydrocarbons; b. compressing the effluent gas stream from the high pressure separator and a make-up hydrogen gas stream in a recycle gas compressor to produce a compressed recycle gas stream containing unreacted hydrogen, methane and heavier hydrocarbons from the effluent gas stream, and make-up hydrogen from the make-up hydrogen gas stream; c. cooling the compressed recycle gas stream to a temperature in the range of +30° F. (−1.1° C.) to −40° F. (−40° C.); d. contacting the cooled compressed recycle gas stream with a lean liquid solvent stream comprising C e. recovering the hydrogen-rich gas stream from the absorption zone; f. adding the hydrogen-rich gas stream to the hydroprocessing reactor feedstream as the hydrogen gas input component; and g. flashing the rich liquid solvent stream in at least one flashing stage to produce the lean liquid solvent stream comprising C