Multibed hydrocracking process utilizing beds with disparate particle sizes and hydrogenating metals contents
In a process for hydrocracking a hydrocarbon feedstock having components boiling above 375 F by reacting the feedstock with hydrogen at a temperature ranging from about 600-900 F, a pressure ranging from about 500-5,000 psig, an LHSV of about 0.1-10 and a hydrogen feed to the process ranging from about 500-20,000 standard cubic feed of hydrogen per barrel of feedstock in the presence of a hydrocracking catalyst comprising a Group VIII component consisting of Ni metal, oxide, sulfide, Co metal, oxide, sulfide and mixtures thereof and a Group VIB component consisting of W metal, oxide, sulfide, Mo metal, oxide, sulfide and mixtures thereof and a carrier comprising an ultra stable zeolite Y and a binder comprising alumina in a reactor comprising five separate beds of the catalyst stacked on top of each other which process comprises (a) providing the feedstock and a hydrogen-containing gas to the top bed, (b) passing the reaction product of each bed directly to the next bed, (c) providing interbed cooling and (d) removing a hydrocracked product from the bottom bed; the improvement is described comprising using in the top bed a catalyst which contains the same hydrogenating components as in the remaining beds and which contains about 1.5 times or greater the gram atom content per gram of total catalyst of one of the Group VIB and Group VIII components and which has an average effective pellet diameter of 0.75 times or less the average effective pellet diameter of the catalyst used in the remaining beds and wherein the catalyst in the remaining beds has a Group VIB content of about 2-15% by weight of the total catalyst, a Group VIII content of about 0.2-3.5% by weight of the total catalyst, a zeolite content ranging from about 70-90% by weight, basis zeolite plus alumina and an average effective pellet diameter ranging from about 0.05-0.2 inches.
- Assignee:
- Shell Oil Co., Houston, TX (United States)
- Patent Number(s):
- US 5232578; A
- Application Number:
- PPN: US 7-682180
- OSTI ID:
- 6416655
- Resource Relation:
- Patent File Date: 9 Apr 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COBALT
CATALYTIC EFFECTS
MOLYBDENUM
NICKEL
PETROLEUM
HYDROCRACKING
TUNGSTEN
ALUMINIUM OXIDES
BOILING POINTS
CATALYST SUPPORTS
CHEMICAL REACTORS
COBALT OXIDES
COBALT SULFIDES
DESIGN
HIGH PRESSURE
HYDROGEN
MEDIUM PRESSURE
MIXTURES
MOLYBDENUM OXIDES
MOLYBDENUM SULFIDES
NICKEL OXIDES
NICKEL SULFIDES
OPERATION
TEMPERATURE RANGE 0400-1000 K
TUNGSTEN OXIDES
TUNGSTEN SULFIDES
ZEOLITES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
CRACKING
DECOMPOSITION
DISPERSIONS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
MOLYBDENUM COMPOUNDS
NICKEL COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
REFRACTORY METAL COMPOUNDS
SILICATE MINERALS
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE RANGE
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
TUNGSTEN COMPOUNDS
020400* - Petroleum- Processing