Catalyst inventory control in an ebullated bed process

Nelson, G V; Nongbri, G

Title: Catalyst inventory control in an ebullated bed process

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Abstract

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)more »« less

Inventors:: Nelson, G V; Nongbri, G

Publication Date:: Tue Jun 01 00:00:00 EDT 1993

OSTI Identifier:: 6423506

Patent Number(s):: US 5215653; A

Application Number:: PPN: US 7-857143

Assignee:: Texaco Inc., White Plains, NY (United States)

Resource Type:: Patent

Resource Relation:: Patent File Date: 25 Mar 1992

Country of Publication:: United States

Language:: English

Subject:: 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

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                    Nelson, G V, and Nongbri, G. Catalyst inventory control in an ebullated bed process.  United States: N. p., 1993. 
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                    Nelson, G V, & Nongbri, G. Catalyst inventory control in an ebullated bed process.  United States.

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                    Nelson, G V, and Nongbri, G. 1993.  
        "Catalyst inventory control in an ebullated bed process".  United States.

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@article{osti_6423506,

  title        = {Catalyst inventory control in an ebullated bed process},

  author       = {Nelson, G V and Nongbri, G},

  abstractNote = {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.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6423506},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Jun 01 00:00:00 EDT 1993},

  month        = {Tue Jun 01 00:00:00 EDT 1993}

}

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