Reactor for carrying out an exothermic reaction

Details Reactor for carrying out an exothermic reaction Reactor for carrying out an exothermic reaction

1997-08-06

2001-11-27

Tran, Hien (Department: 1764)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Fluidized bed

C422S146000, C422S147000

Reexamination Certificate

active

06322755

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a process for carrying out an exothermic reaction in the presence of a solid catalyst in a three-phase slurry reactor. According to a further aspect, the present invention relates to a three-phase slurry reactor for carrying out an exothermic reaction.
BACKGROUND OF THE INVENTION
Three-phase slurry reactors are well known to those skilled in the art. In operation, the reactor comprises a slurry zone and a freeboard zone. In the slurry zone solid catalyst particles are kept in suspension in a liquid. The liquid serves as heat-transfer medium. The mixture of catalyst particles and liquid is commonly referred to as slurry. One or more gaseous reactants bubble through the slurry zone. The freeboard zone located above the slurry zone contains substantially no slurry and serves as a disengagement zone between slurry, and gaseous products and reactants.
The catalyst particles are typically kept in suspension by stirring or agitation by a mechanical device or, preferably, by an upward gas and/or liquid velocity.
Although substantially all catalyst particles are present in the slurry zone, a proportion of the catalyst particles escape from the slurry zone into the freeboard zone and may stick to the reactor wall or internals in the freeboard zone. In the absence of liquid heat-transfer medium, but in the presence of unreacted gaseous reactants, the said catalyst particles continue to catalyse the exothermic reaction. In this way, local hot spots are created which may damage the reactor vessel and/or internals.
Accordingly, it would be desirable to be able to remove catalyst particles efficiently from the freeboard zone.
For the purposes of this specification the term catalyst particles is intended as reference to catalyst particles per se and/or any fines thereof
SUMMARY OF THE INVENTION
Therefore, the present invention relates to a process for carrying out an exothermic reaction in the presence of solid catalyst particles in a three-phase slurry reactor comprising a slurry zone and a freeboard zone, in which slurry zone the catalyst particles are kept in suspension in a slurry liquid, which freeboard zone contains catalyst particles escaped from the slurry zone, and in which freeboard zone a liquid reflux is maintained to remove the catalyst particles from the freeboard zone.


REFERENCES:
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patent: 5417938 (1995-05-01), Sheldon et al.
patent: 5464459 (1995-11-01), VanBurskirk et al.
patent: 5518697 (1996-05-01), Dalla Betta et al.
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