Method for controlling sedimentation in an ebullated bed process
This patent describes an improvement 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. The process comprises introducing the hydrogen-containing gas and feedstock into the lower end of a generally vertical catalyst containing reaction vessel wherein 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. 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 product is removed. The fluid hydrocarbon feedstock is changed from a first, sediment yielding feedstock F{sub 1} to a second feedstock of different sediment yield.
- Assignee:
- Texaco Inc., White Plaine, NY
- Patent Number(s):
- US 4898663; A
- Application Number:
- PPN: US 7-275831A
- OSTI ID:
- 7180770
- Resource Relation:
- Patent File Date: 25 Nov 1988
- Country of Publication:
- United States
- Language:
- English
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