Abstract: A process is disclosed for recovering hydroprocessing effluent from a hydroprocessing unit utilizing a hot stripper and a cold stripper. The cold stripper and the hot stripper are contained in the same vessel. A barrier prevents material from the hot stripper from entering into the cold stripper.

Abstract: The present invention is an improved apparatus for stripping HPNA's from hydroprocessed streams in a fractionation column having a split shell configuration. Only one vapor stripping feed is required to the split shell of the fractionation column. The resulting reduction in steam requirement provides a superior fractionation in the column.

Abstract: The present invention is an improved process for stripping HPNA's from hydroprocessed streams in a fractionation column having a split shell configuration. Only one vapor stripping feed is required to the split shell of the fractionation column. The resulting reduction in steam requirement provides a superior fractionation in the column.

Abstract: Methods are described for generating electrical power from low grade heat sources from refining and petrochemical processes, including overhead vapors from vapor-liquid contacting apparatuses such as distillation columns, absorbers, strippers, quenching towers, scrubbers, etc. In many cases, these overhead vapors exit the apparatuses at a temperature from about 90° C. (194° F.) to about 175° C. (347° F.). Rather than rejecting the low temperature heat contained in these vapors to cooling air and/or cooling water, the vapors may instead be used to evaporate an organic working fluid. The vapors of the working fluid may then be sent to a turbine to drive a generator or other load.

Abstract: A process for the production of low sulfur diesel and high octane naphtha. Separate high pressure vapor liquid separators serve to maintain and isolate the high octane naphtha produced in the hydrocracking zone thereby maximizing the value of the hydrocarbon streams produced.

Abstract: A hydrocracking process and apparatus wherein the feedstock is hydrotreated and the liquid and gaseous effluent from the hydrotreater is directly introduced into the upper end of a hydrocracking vessel which provides a liquid seal to prevent the passage of the gaseous stream containing hydrogen sulfide and ammonia from the hydrotreater to enter the hydrocracking zone containing hydrocracking catalyst. Fresh hydrogen is then introduced into the hydrocracking zone.

Abstract: A method and an apparatus for removing sulfur hydrocarbon compounds from a naphtha stream and for simultaneously removing sulfur hydrocarbon compounds from two streams is described. A separator vessel having a top, a bottom, a primary feed inlet and a co-feed inlet is disposed vertically above the primary feed inlet. The separator vessel further includes a catalyst bed disposed between the co-feed inlet and the top. A primary feed stream comprising sulfur hydrocarbon compounds is delivered through the effluent inlet and a vaporized co-feed stream that also comprises sulfur hydrocarbon compounds is delivered through the co-feed inlet. Vaporized sulfur hydrocarbon compounds from the primary feed stream with the vaporized co-feed stream pass upwardly through the desulfurization catalyst bed. Sulfur hydrocarbon compounds from both primary feed and co-feed stream are at least partially converted to hydrogen sulfide and non-sulfur containing hydrocarbons in the catalyst bed.

Abstract: An integrated process for the hydroprocessing of multiple feedstreams including vacuum gas oil and light cycle oil. The light cycle oil is reacted with hydrogen in a hydrocracking zone and the hydrocarbon feedstream comprising vacuum gas oil is reacted with hydrogen in a hydrodesulfurization reaction zone. The hydrotreated vacuum gas oil is good FCC feedstock. Naphtha and ultra low sulfur diesel are recovered in a common fractionation column.

Abstract: A method and an apparatus for removing sulfur hydrocarbon compounds from naphtha stream as well as a method and an apparatus for simultaneously removing sulfur hydrocarbon compounds from two streams is shown and described. The method includes providing a separator vessel having a top, a bottom, a primary feed inlet in a co-feed inlet disposed vertically above the primary feed inlet. The separator vessel further includes a catalyst bed disposed between the co-feed inlet and the top. The top includes a vapor outlet and bottom includes a bottoms outlet The method includes delivering a primary feed stream comprising sulfur hydrocarbon compounds through the effluent inlet and delivering a vaporized co-feed stream that also comprises sulfur hydrocarbon compounds through the co-feed inlet.

Abstract: An integrated process for the upgrading of a vacuum gas oil feedstock and a light cycle oil feedstock. The vacuum gas oil feedstock is hydrodesulfurized and the light cycle oil feedstock is hydrocracked.

Abstract: A hydrocracking process wherein the feedstock is hydrotreated and the liquid and gaseous effluent from the hydrotreater is directly introduced into the upper end of a hydrocracking vessel which provides a liquid seal to prevent the passage of the gaseous stream containing hydrogen sulfide and ammonia from the hydrotreater to enter the hydrocracking zone containing hydrocracking catalyst. Fresh hydrogen is then introduced into the hydrocracking zone. An apparatus for hydrocracking a hydrocarbon feedstock is also disclosed.

Abstract: A process for the production of low sulfur diesel and high octane naphtha.

Abstract: A catalytic hydrocracking process for the production of ultra low sulfur diesel wherein a hydrocarbonaceous feedstock is hydrocracked at elevated temperature and pressure to obtain conversion to diesel boiling range hydrocarbons. The resulting hydrocracking zone effluent is hydrogen stripped in a stripping zone maintained at essentially the same pressure as the hydrocracking zone to produce a first gaseous hydrocarbonaceous stream and a first liquid hydrocarbonaceous stream. The first gaseous hydrocarbonaceous stream containing diesel boiling range hydrocarbons is introduced into a desulfurization zone and subsequently partially condensed to produce a hydrogen-rich gaseous stream and a second liquid hydrocarbonaceous stream containing diesel boiling range hydrocarbons. The first liquid stream is separated to produce a third liquid hydrocarbonaceous stream containing diesel boiling range hydrocarbons which is also introduced into the desulfurization zone. An ultra low sulfur diesel product stream is recovered.

Abstract: A catalytic hydrocracking process wherein a hydrocarbonaceous feedstock and a liquid recycle stream is contacted with hydrogen in a hydrocracking reaction zone at elevated temperature and pressure to obtain conversion to lower boiling hydrocarbons. A liquid hydrocarbonaceous stream produced from the effluent of the hydrocracking reaction zone is fractionated in a first zone of a divided-wall fractionation zone to produce at least one liquid hydrocarbonaceous product stream and a liquid hydrocarbonaceous stream containing hydrocarbons boiling at a temperature in the boiling range of the feedstock and heavy polynuclear aromatic compounds. At least a portion of the liquid hydrocarbonaceous stream containing heavy polynuclear aromatic compounds is introduced into a second zone of the divided-wall fractionation zone to produce a stream rich in polynuclear aromatic compounds.

Abstract: A dual recycle catalytic hydrocracking process for the production of ultra low sulfur diesel while simultaneously processing two feedstocks. One preferred feedstock boils in the temperature range of diesel and the second preferred feedstock boils in the temperature range above that of diesel.

Abstract: A method of operation of a steam stripped fractionation column by using a computer to process the relevant operating parameters of the column to determine the undesirable approach to a possible flooding condition.

Abstract: A hydrocracking process wherein the undesirable production of polynuclear aromatic compounds is controlled by removing a small dragstream of high pressure product stripper bottoms to reject polynuclear aromatic compounds and recovering valuable diesel boiling range hydrocarbons and unconverted feedstock by routing the dragstream to a hot flash separator and subsequently to a divided wall fractionation zone to produce a concentrated stream of polynuclear aromatic compounds while recovering the valuable hydrocarbon compounds.

Abstract: A catalytic hydrocracking process wherein a hydrocarbonaceous feedstock and a liquid recycle stream is contacted with hydrogen in a hydrocracking reaction zone at elevated temperature and pressure to obtain conversion to lower boiling hydrocarbons. A liquid hydrocarbonaceous stream produced from the effluent of the hydrocracking reaction zone is fractionated in a first zone of a divided-wall fractionation zone to produce at least one liquid hydrocarbonaceous product stream and a liquid hydrocarbonaceous stream containing hydrocarbons boiling at a temperature in the boiling range of the feedstock and heavy polynuclear aromatic compounds. At least a portion of the liquid hydrocarbonaceous stream containing heavy polynuclear aromatic compounds is introduced into a second zone of the divided-wall fractionation zone to produce a stream rich in polynuclear aromatic compounds.

Abstract: A catalytic hydrocracking process which provides for the simultaneous production of LPG and distillate hydrocarbons. The feedstock is introduced into a denitrification and desulfurization zone and then passed directly to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first liquid stream boiling in the range of the feedstock and a first vapor stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the feedstock. The first liquid stream is hydrocracked in a first hydrocracking zone and then passed to the denitrification and desulfurization zone. At least a portion of the first vapor stream is condensed to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the feedstock.

Abstract: A catalytic hydrocracking process wherein a denitrification and desulfurization reaction zone effluent is heat-exchanged with a hydrogen-rich gaseous stream and introduced into a hydrocracking zone. The resulting effluent from the hydrocracking zone is passed directly without cooling into a hot, high-pressure stripper utilizing a hot, hydrogen-rich gaseous stream at least a portion of which is heated during the heat exchange with the denitrification and desulfurization reaction zone effluent. The stripper overhead is partially condensed to produce a hydrogen-rich gaseous stream and a liquid stream containing hydrocracked hydrocarbon compounds. At least a portion of the stripper bottoms is recycled to the denitrification and desulfurization reaction zone.