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US 2006/0217501 A1Published application
Process for production of propylene homopolymers
AssigneeSunoco, Inc. (R&M)
InventorsRuben Migone, Sehyun Kim
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Abstract
A process for producing propylene homopolymers comprises producing a homopolymer in a reactor train having a first stage and a second stage, wherein the first stage is normally used for homopolymer production and the second stage is normally used only in the production of copolymer blends, and is left idle during homopolymer production. According to the invention, during the production of propylene homopolymer, the polymerization is carried out sequentially in both the first stage and second stage reactors.
Claims12
A process for producing a propylene homopolymer, comprising:
- in a first stage comprising at least one liquid or gas phase reactor, polymerizing propylene in the presence of a Zeigler-Natta catalyst to produce a target propylene homopolymer,
- transferring the target propylene homopolymer to a second stage comprising at least one separate gas phase reactor, and
- continuing to polymerize propylene in the presence of the target propylene homopolymer to produce additional amounts of the target propylene homopolymer, wherein a first amount of an external donor is added to the first stage and a second, additional, amount of external donor is added to the second stage.
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Dependencies are inferred from the claim text.