Preparation of a solid Ziegler catalyst by using a multi-functio

Details Preparation of a solid Ziegler catalyst by using a multi-functio Preparation of a solid Ziegler catalyst by using a multi-functio

1994-03-22

1995-12-05

Pal, Asok

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502150, 502169, 502514, B01J 3300, B01J 3700

Patent

active

054729238

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a method for the preparation of a solid catalyst suitable for the polymerization of olefins which comprises a transition metal compound reacted upon a carrier by carrying out in the method the following consecutive steps: a vessel, where they residue, impurities are removed through the above-mentioned bottom sieve, and
The invention also relates to equipment for the preparation of such a solid procatalyst intended for olefin polymerization that comprises a transition metal compound reacted for a carrier by means of the above feed, reaction, separation, removal, washing and drying operations. The equipment comprises: keeping together and removing of the materials participating in the operations, above-mentioned materials, and procatalyst particles from the above-mentioned materials.


BACKGROUND OF THE INVENTION

For the polymerization of olefins, to which the method and equipment according to the invention relates, the Ziegler-Natta catalyst system is commonly used, which consists of a so-called procatalyst and a cocatalyst. The procatalyst is based on a compound of a transition metal belonging to any of the groups IVA-VIII (Hubbard) of the periodical table of the elements and the cocatalyst is based on an organometallic compound of a metal belonging to any of the groups IA-IIIA (Hubbard) of the periodical table of the elements. The procatalyst can also comprise a carrier, on which the transition metal compound is layered, and an internal electron donor improving and modifying the catalytic properties thereof.
The reacting of the transition metal compound onto the surface of the carrier is carried out between a solid phase carrier being and most frequently a liquid transition metal compound or a transition metal compound in a liquid. Thus this stage of the procatalyst preparation includes the operations where the starting materials are fed into the reaction vessel and suitable reaction conditions are created therein to separate the unreacted liquid from the product and to wash and dry the product.
The carrier layered with the transition metal compound is available for use as a dried powder for the polymerization of olefins, whereby the combination with the co-catalyst is carried out before or at the start of the polymerization operation. The above-mentioned operations for the preparation of a procatalyst are usually carried out in different units and thus the intermediate products must be transferred from one unit to another during the production. As both the reaction components and the reactions are very sensitive to impurities, such as the oxygen and moisture of the air, such transfer operations can result in low and unequal quality. Moreover, the various reaction and washing operations succeeding each other require that the created solid precipitate sinks to the bottom of the vessel, whereby the agitation must be stopped and the liquid siphonated away from the surface of the precipitate. Such an operation leaves an abundance of activation and washing liquid in the precipitate, for which reason its separation and washing effect is weak and many washing stages are required before a required purity grade is achieved.
Accordingly, an unreasonable amount of time and washing chemicals are spent in the present operations and, moreover, a part of the usable solid material disappears in the siphonation stage as it is dispersed in the liquid to be removed.
The drying stage can be very problematic since the polymerization catalyst, being sensitive to the oxygen and moisture in the air, can, in the absence of a protecting liquid layer, be destroyed, unless the operations are carried out in a very inert, dry and oxygen-free atmosphere. When mechanical driers are used the danger exists that the fragile catalyst particles are broken and imperceptible air leakages easily occur during the vacuum drying which destroy the catalyst.
To solve the above-mentioned problems it is known to use the method according to the Finnish patent No. 83329 and a multi-function reactor, in w

REFERENCES:
patent: 1331903 (1920-02-01), Elder

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