Process control for long chain branching control in polyethylene production

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United States of America Patent

PATENT NO 11459413
APP PUB NO 20210284768A1
SERIAL NO

16336611

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Abstract

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Polymerization process control methods for making polyethylene are provided. The process control methods include performing a polymerization reaction in a polymerization reactor to produce the polyethylene, where ethylene, and optionally one or more comonomers, in the polymerization reaction is catalyzed by an electron donor-free Ziegler-Natta catalyst and an alkyl aluminum co-catalyst. A melt flow ratio (I21/I2) of the polyethylene removed from the polymerization reactor is measured and an amount of long chain branching (LCB) of the polyethylene from the polymerization reactor is controlled by adjusting a weight concentration of the alkyl aluminum co-catalyst present in the polymerization reactor. In addition, an electron donor-free Ziegler-Natta catalyst productivity of the polyethylene being produced in the polymerization reactor is measured from which the amount of LCB of the polyethylene from the polymerization reactor is determined using the measured electron donor-free Ziegler-Natta catalyst productivity and a predetermined relationship between the electron donor-free Ziegler-Natta catalyst productivity and the LCB.

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Patent Owner(s)

Patent OwnerAddress
UNIVATION TECHNOLOGIES LLC5555 SAN FELIPE SUITE 700 HOUSTON TX 77056

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cann, Kevin J Tierra Verde, US 78 893
Goode, Mark G S. Charleston, US 68 698
Mariott, Wesley R Freeport, US 34 148
Moorhouse, John H Middlesex, US 47 416
Oswald, Thomas Lake Jackson, US 43 448

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