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Polyolefin Catalyst Transition Using an Increased Aluminum Alkyl Treatment

IP.com Disclosure Number: IPCOM000244003D
Publication Date: 2015-Nov-04
Document File: 3 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure relates to a process for transitioning between incompatible polyolefin polymerization catalysts In particular this disclosure relates to a process for transitioning from an olefin polymerization reaction utilizing a metallocene catalyst to Ziegler Natta catalyst using an increased aluminum alkyl treatment

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Polyolefin Catalyst Transition Using an Increased Aluminum Alkyl Treatment

Abstract: This disclosure relates to a process for transitioning between incompatible polyolefin polymerization catalysts. In particular, this disclosure relates to a process for transitioning from an olefin polymerization reaction utilizing a metallocene catalyst to Ziegler-Natta catalyst using an increased aluminum alkyl treatment.

Background

During the production of polyolefin polymers in commercial reactors, it is often necessary to transition from one type of catalyst producing polymers having certain properties and characteristics to a different catalyst capable of producing polymers of different chemical and/or physical attributes. Transitioning between similar types of catalysts or compatible catalysts generally takes place easily. However, where the catalysts are incompatible or of different types the process is typically complicated.

For example, when transitioning a gas phase reactor from a metallocene catalyst that uses a continuity additive (e.g., CA-200 or CA-300 available from Univation Technologies, LLC, Houston, TX) to a Ziegler-Natta catalyst that uses a co-catalyst (e.g., aluminum alkyls such as triethyl aluminum (TEAL)), there is potential for undesired reactions between the continuity additive and the aluminum alkyl. Their interaction has shown to produce pro-static agents which create operability issues when starting-up with a Ziegler-Natta catalyst. Thus, it would be desirable to avoid these issues when transitioning from a metallocene catalyst to a Ziegler-Natta catalyst.

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