Catalyst inventory control in an ebullated bed process

Patent · Tue Jun 01 00:00:00 EDT 1993

OSTI ID:6423506

Nelson, G V; Nongbri, G

A method of maintaining a selected weight of catalyst in a reactor in a continuous process for treating a fluid hydrocarbon feedstock with a hydrogen-containing gas at elevated catalytic reaction temperatures and pressures in the presence of a bed of particulate solid catalyst is described, said process comprising introducing the hydrogen-containing gas and feedstock into the lower end of a generally vertical catalyst containing reaction vessel at sufficient velocity whereby the catalyst is placed in random motion within the fluid hydrocarbon whereby the catalyst bed is expanded to a volume greater than its static volume, wherein the mixture of feedstock, gas and catalyst constitutes a turbulent zone from which zone aged catalyst is removed and fresh catalyst is added, the upper portion of which turbulent zone is defined by an interface with a substantially catalyst depleted zone from which zone hydrocracked hydrocarbon is removed, wherein the improvement comprises: 1. determining an interface height (H2) from a point adjacent the bottom of the bed (h0) to a point corresponding to the interface (h2), 2. determining an effective bed height (H1) from h0 to an intermediate fixed point (h1) in the bed adjacent the interface, and 3. determining a reactor height (H3) from a point adjacent the catalyst depleted zone top (h3) to h0, 4. measuring a first differential pressure (DP1) between h0 and h1, 5. measuring a second differential pressure (DP2) between the point adjacent the catalyst depleted zone top (h3) and h1, 6. determining a value for a catalyst inventory characterization factor (Wc) in accordance with the formula given in this patent, 7. removing aged catalyst, thereby changing the value of Wc, and 8. adding fresh catalyst in an amount to return to said value of Wc.

• Assignee: Texaco Inc., White Plains, NY (United States)
• Patent Number(s): US 5215653; A
• Application Number: PPN: US 7-857143
• OSTI ID: 6423506
• Resource Relation: Patent File Date: 25 Mar 1992
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CATALYSTS
CONTROL
HYDROCARBONS
CATALYTIC CRACKING
HYDROCRACKING
CALCULATION METHODS
CHEMICAL REACTORS
EBULLATED BED
HEIGHT
INTERFACES
INVENTORIES
MATERIALS RECOVERY
PROCESS CONTROL
REGENERATION
REMOVAL
TURBULENCE
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
DIMENSIONS
MANAGEMENT
ORGANIC COMPOUNDS
PROCESSING
PYROLYSIS
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
020400* - Petroleum- Processing