Abstract: An integrated hydrotreating process which produces a high quality feed for the FCC to maintain sulfur in FCC gasoline to a level lower than 30 ppm from a high boiling feedstock and an ultra low sulfur diesel stream preferably less than 10 ppm from a cracked diesel boiling material. The high boiling feedstock is firstly hydrotreated to reduce the concentration of heterogeneous compounds which produces lower boiling hydrocarbonaceous compounds boiling in the diesel range and the resulting hydrotreated high boiling feedstock is separated in a high pressure stripper. The resulting hydrocarbonaceous compounds boiling in the diesel range together with other cracked and/or straight run material in the diesel boiling range are further hydrotreated in an integrated second hydrotreating zone to meet ultra low sulfur diesel specifications and a high cetane index.

Abstract: A novel catalyst composite is disclosed. Also disclosed is a use for the novel composite. The catalyst composite comprises a Group VIII noble metal component, a Group IA or IIA metal component, and a component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium, or mixtures thereof, all on an alumina support comprising essentially theta-alumina, having a surface area from about 50 to about 120 m2/g, an apparent bulk density of at 0.5 g/cm3 and a mole ratio of the Group VIII noble metal component to the component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium or mixtures thereof in the range from about 1.5 to about 1.7.

Abstract: Heavy hydrocarbons are upgraded to higher value distillates in a hydrocarbon conversion process which employs several parallel on-stream reaction zones which each contain both hydrotreating and hydrocracking catalyst beds. The feed and liquid recycled from the bottom of the reaction zone is charged to the top of the uppermost catalyst bed. Hydrogen flow in the reaction zones is countercurrent to the descending liquid, and products are removed as vapor. The flow of feed to one of the reaction zones is periodically stopped to allow sequential on-stream hydrogenative regeneration of the catalysts within the reaction zones. This allows continuous commercial operation at conditions which are otherwise unfeasible.

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 catalytic hydrocracking process which simultaneously hydroprocesses two feedstocks to provide higher liquid product yields and increase the quality of the liquid products. A first feedstock is passed to a denitrification and desulfurization reaction zone to produce a stream which is in turn passed to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first vapor stream and a first liquid stream. At least a portion of the first liquid stream is passed to a hydrocracking zone. A second feedstock having an average boiling point lower than the first feedstock in one embodiment is passed into an upper end of the hot, high pressure stripper to serve as reflux and in another embodiment is passed to an intermediate location in the denitrification and desulfurization reaction zone to serve as quench.

Abstract: A process for desulfurizing a gasoline stream while continuing to maintain the octane rating of the blend stock. A gasoline stream containing sulfur compounds and olefins is introduced into a fractionation zone to produce a low boiling fraction containing mercaptan sulfur compounds and olefins, a mid boiling fraction containing thiophene and olefins, and a high boiling fraction containing sulfur compounds. The low boiling fraction containing mercaptan sulfur compounds is contacted with an aqueous alkaline solution to selectively remove mercaptan sulfur compounds. The mid boiling fraction containing thiophene is extracted to produce a raffinate stream containing olefins and having a reduced sulfur content relative to the mid boiling fraction and a hydrocarbonaceous stream rich in thiophene.

Abstract: A hydrocracking process wherein a hydrocarbonaceous feedstock and a hot hydrocracking zone effluent containing hydrogen is passed to a denitrification and desulfurization reaction zone to produce hydrogen sulfide and ammonia to thereby clean up the fresh feedstock. The resulting hot, uncooled effluent from the denitrification and desulfurization zone is hydrogen stripped in a stripping zone maintained at essentially the same pressure as the preceding reaction zone with a hydrogen-rich gaseous stream to produce a vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the fresh feedstock, hydrogen sulfide and ammonia, and a liquid hydrocarbonaceous stream which is countercurrently contacted with hydrogen in a hydrogenation zone located in the bottom end of the stripping zone.

Abstract: A catalytic hydrocracking process for the production of lube base oil wherein a hydrocarbonaceous feedstock is contacted with hydrogen and a metal promoted hydrocracking catalyst in a hydrocracking reaction zone at elevated temperature and pressure to obtain conversion to higher hydrogen-content hydrocarbons including lube base oil. The resulting hot, uncooled effluent from the hydrocracking reaction zone is hydrogen stripped in a hot, high pressure 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. At least a portion of the first gaseous hydrocarbonaceous stream is condensed to produce a second liquid hydrocarbonaceous stream and a second hydrogen-rich gaseous stream. The first liquid hydrocarbonaceous stream is preferably separated at a pressure greater than atmospheric pressure to provide at least one lube base oil product stream.

Abstract: A selective acetylene hydrogenation process which is able to produce a high quality diolefin having extremely low levels of acetylene over an extended period of time compared with the prior art. The process of the present invention provides a selective hydrogenation reaction zone wherein the catalyst activity is maintained at a high level while the process unit remains on stream by contacting the selective hydrogenation catalyst with a polymer solvent, diolefin feed and hydrogen in one embodiment and by contacting the selective hydrogenation catalyst off-line with only polymer solvent and hydrogen in a second embodiment. In addition, the quantity of make-up regeneration solvent is significantly reduced.

Abstract: A process for the production of lube oil basestock wherein a high boiling hydrocarbonaceous feedstock is hydrocracked to produce hydrocarbons boiling in the range of lube oil basestock and the resulting hydrocracker effluent is hot, hydrogen stripped to remove lower boiling hydrocarbons and hydrogen sulfide before being introduced into a hydrodewaxing zone. In a preferred embodiment the hot hydrogen stripper contains a hydrogenation zone conducted at “sweet” hydrogenating conditions which permits the subsequent use of sulfur sensitive catalysts in downstream reaction zones including hydrodewaxing and hydrofinishing reaction zones. Preferably, the effluent from the hydrodewaxing reaction zone is immediately further processed in a hydrofinishing reaction zone.

Abstract: A catalytic hydrocracking process wherein a hydrocarbonaceous feedstock is converted by combining with a hot recycle stream containing hydrogen, and the mixture is passed to a denitrification and desulfurization reaction zone, and then to a hydrocracking zone. The resulting hot, uncooled effluent from the hydrocracking zone is hydrogen stripped in a stripping zone maintained at essentially the same pressure as the hydrocracking zone to produce a vapor stream containing hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the fresh feedstock, hydrogen sulfide and ammonia, and a liquid hydrocarbonaceous stream wherein at least a portion of this liquid stream is then passed to the denitrification and desulfurization reaction zone.

Abstract: A hydrocracking process wherein a hydrocarbonaceous feedstock and a hot hydrocracking zone effluent containing hydrogen is passed to a hydrocracking reaction zone to produce lower boiling hydrocarbon compounds. The resulting hot, uncooled effluent from the hydrocracking zone is hydrogen stripped in a stripping zone maintained at essentially the same pressure as the preceding hydrocracking reaction zone with a hydrogen-rich gaseous stream to produce a vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the fresh feedstock, hydrogen sulfide and ammonia, and a liquid hydrocarbonaceous stream which is countercurrently contacted with hydrogen in a hydrogenation zone located in the bottom end of the stripping zone.

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 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 process for the rejection of heavy reaction by-products from a selective hydrogenation reaction zone effluent containing butadiene and trace amounts of heavy reaction by-products by introducing the selective hydrogenation reaction zone effluent into a butadiene extraction vaporizer containing a fractionation zone, refluxing the fractionation zone with a raffinate stream from a butadiene extraction zone; removing a vaporized stream containing butadiene and having a reduced concentration of heavy reaction by-products from the vaporizer; removing and recovering a concentrated liquid product stream containing heavy reaction by-products from the vaporizer; and introducing the vaporized stream containing butadiene into the butadiene extraction zone.

Abstract: A catalytic hydrocracking process wherein a hydrocarbonaceous feedstock and a liquid recycle stream having a temperature greater than about 500° F. and saturated with hydrogen is contacted with hydrogen in a hydrocracking reaction zone at elevated temperature and pressure to obtain conversion to lower boiling hydrocarbons. The resulting hot, uncooled effluent from the hydrocracking reaction zone is hot 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 is passed through a post-treat hydrogenation zone to saturate aromatic compounds and at least partially condensed to produce a second liquid hydrocarbonaceous stream and a second hydrogen-rich gaseous stream.

Abstract: A catalytic hydrocracking process wherein a first hydrocarbonaceous feedstock is contacted with a hydrogen and a metal promoted hydrocracking catalyst in a hydrocracking reaction zone at elevated temperature and pressure to obtain conversion to lower boiling hydrocarbons. The resulting hot, uncooled effluent from the hydrocracking reaction zone is hot 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. At least a portion of the first liquid hydrocarbonaceous stream is preferably recycled to the hydrocracking reaction zone. A second hydrocarbonaceous feedstock having a boiling temperature range lower than that of the first hydrocarbonaceous feedstock is introduced into an upper end of the stripper to serve as reflux.

Abstract: A hydrocracking process wherein a hydrocarbonaceous feedstock and a hot hydrocracking zone effluent containing hydrogen is passed to a denitrification and desulfurization reaction zone to produce hydrogen sulfide and ammonia to thereby clean up the fresh feedstock. The resulting hot, uncooled effluent from the denitrification and desulfurization zone is hydrogen stripped in a stripping zone maintained at essentially the same pressure as the preceding reaction zone with a hydrogen-rich gaseous stream to produce a vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the fresh feedstock, hydrogen sulfide and ammonia, and a liquid hydrocarbonaceous stream.