Gas phase polymerization process of C2-C8-alk-1-enes using a Ziegler-Natta- or a metallocene catalyst
Gas phase homo- or copolymerisation of 2-8C alk-1-enes with a Ziegler-Natta or metallocene catalyst system is carried out in a stirred bed of finely-divided polymer, with addition of the catalyst solid (I) containing transition metal with the alkene. The novelty is that (I) is introduced into the re...
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Main Authors | , , , |
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Format | Patent |
Language | English French German |
Published |
27.01.1999
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Edition | 6 |
Subjects | |
Online Access | Get full text |
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Summary: | Gas phase homo- or copolymerisation of 2-8C alk-1-enes with a Ziegler-Natta or metallocene catalyst system is carried out in a stirred bed of finely-divided polymer, with addition of the catalyst solid (I) containing transition metal with the alkene. The novelty is that (I) is introduced into the reactor with (part of) the alkene through (almost) vertical pipe(s) projecting down into the gas space and ending above the stirred powder bed. Also claimed is the apparatus used. Preferably the vertical distance between the pipe(s) and the surface of the bed is < 15%, especially < 10% of the distance between the top of the reactor and the bed. The pipe(s) end in the middle of the reactor or are slightly eccentric, such that distance of the end(s) of the pipe(s) from the middle is < 20%, especially < 15% of the radius of the reactor. The bed is agitated with a spiral stirrer. |
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Bibliography: | Application Number: EP19970122067 |