Method for the discontinuous thermal treatment of catalyst material
First Claim
1. A method for the discontinuous thermal treatment of a catalyst material comprising a chromium compound and a support material for olefin polymerization comprising the steps(a) introducing the catalyst material for olefin polymexization into a preheated reactor;
- (b) heating the catalyst material;
(c) thermally treating in the form of calcination the catalyst material in the reactor at a reactor temperature;
(d) discharging the catalyst material from the reactor; and
(e) cooling the catalyst material in nitrogen, wherein the reactor temperature is kept constant during steps (a) to (e) and wherein step (c) is carried out after step (b) and before step (e) and step (d) is carried out before step (e) and steps (a) to (d) are performed in the presence of oxygen.
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Abstract
Method for the discontinuous thermal treatment of catalyst material comprising the steps
(a) introducing the catalyst material into a reactor,
(b) heating the catalyst material,
(c) thermally treating the catalyst material in the reactor at the reactor temperature,
(d) discharging the catalyst material from the reactor and
(e) cooling the catalyst material,
wherein the reactor temperature is kept constant during the steps (a) to (e), step (b) is carried out during and/or after step (a), step (e) is carried out during and/or after step (d), and step (c) is carried out after step (b) and before step (e).
The method is used primarily for the calcination or activation of catalysts or catalyst supports which are used in polyolefin production.
18 Citations
17 Claims
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1. A method for the discontinuous thermal treatment of a catalyst material comprising a chromium compound and a support material for olefin polymerization comprising the steps
(a) introducing the catalyst material for olefin polymexization into a preheated reactor; -
(b) heating the catalyst material;
(c) thermally treating in the form of calcination the catalyst material in the reactor at a reactor temperature;
(d) discharging the catalyst material from the reactor; and
(e) cooling the catalyst material in nitrogen, wherein the reactor temperature is kept constant during steps (a) to (e) and wherein step (c) is carried out after step (b) and before step (e) and step (d) is carried out before step (e) and steps (a) to (d) are performed in the presence of oxygen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification