Process for introducing a solid catalyst into a fluidized or...

Details Process for introducing a solid catalyst into a fluidized or... Process for introducing a solid catalyst into a fluidized or...

2001-01-23

2002-06-04

Teskin, Fred (Department: 1713)

Conveyors: fluid current

Intake to fluid current conveyor

Load receptacle type

C406S108000, C222S195000, C222S630000, C222S637000, C526S086000, C526S919000

Reexamination Certificate

active

06398463

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a process for introducing a solid into a fluidised or agitated vessel and in particular for introducing a catalytically active solid into a fluidised or agitated vessel. It also relates to an apparatus for carrying out said process.
French Patent Application n
o
2 562 077 discloses a process and an apparatus for introducing a powdery catalyst into a fluidised bed reactor for the gas phase polymerisation of olefins. The catalyst powder is conveyed into the reactor in the form of a dense and compacted powder,. i.e. in ‘plug flow’ or ‘packed bed’ mode. Such ‘plug flow’ or ‘packed bed’ flow generally results in poor dispersion of the catalyst inside the reactor causing the formation of hot-spots, and possibly agglomeration of polymer, which may lead to termination of the reaction.
French Patent Application n
o
2 705 252 discloses a process for introducing a solid into a reactor wherein the solid is first introduced into a feed enclosure and subsequently, on introduction of a gas into the feed enclosure, is suspended in the gas. The gas is introduced into the feed enclosure above the uppermost level of the solid. While this technique already represents an improvement in term of catalyst dispersion, major improvements were still needed in the art.
A process and apparatus have now been found for introducing a solid into a fluidised or agitated vessel without the abovementioned drawbacks i.e. a process and apparatus which provide for improved entry of the solid into the vessel and which also provide for improved dispersion of the solid in the vessel, particularly when a gas phase reactor such as a fluidised bed reactor is used.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a process for introducing a solid particles feed into a fluidised or agitated vessel utilising a feed delivery device, a vertical feed dilution pipe and a feed injection pipe connected to the vessel, said process comprising the following steps:
(a) introducing the solid particles feed from the feed delivery device into the vertical feed dilution pipe,
(b) diluting the solid particles feed by letting the solid particles reaching by gravity their terminal velocity in the feed dilution pipe,
(c) introducing the diluted solid particles feed into the injection pipe and mixing it with a conveying gas, and
(d) introducing said gas conveyed diluted solid particles feed into the Vessel.


REFERENCES:
patent: 3573200 (1971-03-01), Vogel
patent: 0 032 064 (1981-07-01), None
patent: 0 728 771 (1996-08-01), None
patent: 981.775 (1951-05-01), None
patent: 2 274 110 (1994-07-01), None
A Haider, et al., “Drag Coef ficient and Terminal Velocity of Spherical and Nonspherical Particles”,Powgder Technology, vol. 58, pp. 63-70 (1989).

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