Abstract: Saturation of a pyrolysis stream is achieved while managing exotherms. The pyrolysis stream is split into at least two feed streams for at least two saturation reactors. The process may split the hydrogen stream into at least two streams for the at least two saturation reactors. A recycle stream may also be provided to manage the exotherm. The feed may comprise at least 5 wt % aromatics.

Abstract: An apparatus and process heat a process stream taken from a separator vessel by heat exchange with a hydroprocessed effluent stream and return the heated process stream to the separator vessel. We have found the significant heater duty reduction is provided particularly for a hydroprocessing unit. A spiral tube heat exchange can achieve heating of an already hot process stream by heat exchange with a hot effluent stream.

Abstract: A process for recovery of C5+ hydrocarbons from a stripper gaseous hydroprocessed stream by contacting it with a stripper liquid stream. The stripper liquid stream absorbs C5+ hydrocarbons predominantly over other hydrocarbons thereby increasing C5+ yield and enabling the stripper gaseous stream to meet hydrocarbon limits. The rich absorbent stream may be sent to recovery with the stripper liquid from whence it came.

Abstract: A process and apparatus for hydrocracking a hydrocarbon stream that feeds a cold stripped stream and a hot stripped stream to a product fractionation column which may be reboiled. The product fractionation bottoms stream is passed to a heavy fractionation column that may be steam stripped and may be under vacuum.

Abstract: A medium separator is used to recover a gaseous stream from a hydroprocessed liquid stream for hydrogen recovery in a hydrogen recovery unit. A medium flash drum may further remove liquid components from the gaseous stream prior to hydrogen recovery in the hydrogen recovery unit.

Abstract: A membrane unit is able to recover hydrogen from a resid waste gas stream. Two membrane units provide even greater hydrogen recovery. The membrane separation is performed at conditions that allow the pressure of the recovered hydrogen to enter into a second stage of compression, saving the expense of the first stage of compression.

Abstract: A process is disclosed for reducing loss of hydrogen in solution to the fractionation section of a hydroprocessing unit. The hot flash overhead vapor bypasses the cold flash drum and may be treated with the cold flash vapor stream from the cold flash drum to recover hydrogen. Substantial conservation of hydrogen gas is achieved.

Abstract: A process for recovery of C5+ hydrocarbons from a stripper gaseous hydroprocessed stream by contacting it with a stripper liquid stream. The stripper liquid stream absorbs C5+ hydrocarbons predominantly over other hydrocarbons thereby increasing C5+ yield and enabling the stripper gaseous stream to meet hydrocarbon limits. The rich absorbent stream may be sent to recovery with the stripper liquid from whence it came.

Abstract: The invention provides processes for the production of hydrocarbons from a biorenewable feedstock blended with a mineral feedstock comprises hydrotreating to remove heteroatoms and saturate olefins. The carbon monoxide is not fed to the downstream hydroisomerization reactor but supplanted with a hydrogen gas with a low concentration of carbon monoxide so as not to poison the hydroisomerization catalyst to improve the cold flow properties for a diesel fuel.

Abstract: We have discovered a process for hydrocracking a distillate stream and separating it into several product cuts including LPG, light naphtha, heavy naphtha and distillate without a stripper column. Additionally, no more than two heaters relying on external utilities are required for reboiling fractionator bottoms.

Abstract: Processes for combining the stripping sections for two different reaction zones, such as a diesel hydrotreating zone and a naphtha hydrotreating zone. The stripping section includes an air cooler, a combined overhead receiver and two different separation sections. The two separation sections may be in the same column, but be fluidically separated. Alternatively the two sections may be in different columns. A stream from the second section may be used as a reflux from the first. While a stream from the combined overhead condenser may provide a reflux for the first section.

Abstract: A process and apparatus for hydrocracking a hydrocarbon stream that feeds a cold stripped stream and a hot stripped stream to a product fractionation column which may be reboiled. The product fractionation bottoms stream is passed to a heavy fractionation column that may be steam stripped and may be under vacuum.

Abstract: We have discovered a process for hydrocracking a distillate stream and separating it into several product cuts including LPG, light naphtha, heavy naphtha and distillate without a stripper column. Additionally, no more than two heaters relying on external utilities are required for reboiling fractionator bottoms.

Abstract: A process and apparatus removes HPNA's from a fractionated bottoms stream from a reboiled product fractionation column that obtains heat from a reboiler. HPNA's are removed from the fractionated bottoms stream by stripping it with an inert gas. The HPNA lean stream may be fed back to the reboiled product fractionation column at the same elevation as the feed stream to the column.

Abstract: A hydrotreating reactor including a vessel comprising an upper zone, and intermediate zone and a lower zone. The upper zone comprises at least one upper catalyst bed. The intermediate zone comprises a vapor/liquid separation zone, wherein gas separated within the vapor/liquid separation zone is directed to a high pressure knockout drum and the liquid separated within the vapor/liquid separation zone is directed to a stripping section and then the lower zone. The lower zone comprises at least one lower catalyst bed. Preferably, the stripping section is configured and arranged for removing hydrogen sulfide and ammonia from the gas.

Abstract: The invention provides processes for the production of hydrocarbons from a biorenewable feedstock blended with a mineral feedstock comprises hydrotreating to remove heteroatoms and saturate olefins. The carbon monoxide is not fed to the downstream hydroisomerization reactor but supplanted with a hydrogen gas with a low concentration of carbon monoxide so as not to poison the hydroisomerization catalyst to improve the cold flow properties for a diesel fuel.

Abstract: An apparatus and process is disclosed for hydrocracking a hydrocarbon feed stream following hydrotreating the feed stream. A separator removes diesel and lower boiling materials in a hydrotreated stream before a hydrocracking reactor, so only liquid materials heavier than diesel are hydrocracked in a hydrocracking reactor. A vapor hydrotreated stream and the hydrocracked stream are separated and fractionated together.

Abstract: A process and apparatus for two stage hydrocracking saturates aromatics from the first stage hydrocracking unit to prevent production of HPNA's. The saturated HPNA's can be hydrocracked in the second stage to minimize or eliminate purged unconverted oil to approach or obtain maximum conversion. In an aspect, the second stage hydrocracking reactor and hydrotreating reactor may be located in the same vessel.

Abstract: A process is disclosed for reducing loss of hydrogen in solution to the fractionation section of a hydroprocessing unit. The hot liquid stream is stripped with an inert gas in a hot flash stripper to urge hydrogen into the hot flash vapor stream. Substantial conservation of hydrogen gas is achieved.

Abstract: We have discovered a process for hydrocracking a distillate stream and separating it into several product cuts including LPG, light naphtha, heavy naphtha and distillate without a stripper column. Additionally, no more than two heaters relying on external utilities are required for reboiling fractionator bottoms.