Chevron Phillips Chemical Company LP

Daniel G Hert

Max P McDaniel

Qing R Yang

Ashish M Sukhadia

Chung Ching Tso

Eric D Schwerdtfeger

Errun Ding

Guylaine St Jean

Yongwoo Inn

Mark L Hlavinka

Steven J Secora

John R Rathman

William M Whitte

Youlu Yu

Carlos A Cruz

Jared L Barr

Albert P Masino

Eric J Netemeyer

Lloyd W Guatney

Brandy Rutledge-Ryal

William J Fisher

Kelly Frey

Bill Bridendolph

Max P Mcdaniel

Qing Yang

Bryan G Kubsch

Guylaine STJEAN

A method of operating a polyethylene reactor system includes feeding ethylene, an optional first comonomer, a diluent, and a chromium-based catalyst to a first polymerization reactor. The method further includes contacting ethylene and the comonomer with the catalyst in the first polymerization reactor to form a first product including a first polyethylene. The method further includes feeding the first product from the first polymerization reactor to a second polymerization reactor. The method further includes contacting ethylene and a second optional comonomer with catalyst from the first reactor in the second polymerization reactor to form a second product including the first polyethylene and a second polyethylene. The method further includes controlling one or both of a molecular weight or a breadth of molecular weight distribution of the second product by adjusting a rate of hydrogen fed to one or both of the first polymerization reactor or the second polymerization reactor.

Methods for operating polyethylene reactor systems

A method of monitoring a solid component of a reactor feed stream in a polymer production system, comprising (a) measuring a turbidity of the reactor feed stream, wherein the reactor feed stream comprises a solid component of a polymerization catalyst system, and (b) translating the turbidity of the reactor feed stream into a concentration of the solid component in the reactor feed stream. A method of monitoring a solid component of a reactor feed stream in a polymer production system, comprising (a) measuring a turbidity of a precontactor feed stream, wherein the precontactor feed stream comprises a solid component of a polymerization catalyst system, and (b) translating the turbidity of the precontactor feed stream into a concentration of the solid component in a precontactor effluent stream, wherein the precontactor effluent stream comprises the reactor feed stream.

Use of turbidimeter for measurement of solid catalyst system component in a reactor feed

The present disclosure relates generally to a system having a reactor system with a polymerization reactor and a feed system fluidly coupled to a feed inlet of the reactor. The feed system supplies components to the reactor via the feed inlet, and the reactor has a flow path that continuously conveys the components through the reactor and subjects the components to polymerization conditions to produce a polymer. The system also has an analysis system coupled to the reactor for online monitoring of a particle size of the polymer. Further, the system includes a control system, coupled to the analysis and feed systems, that receives a signal from the analysis system indicative of the monitored particle size of the polymer and adjusts an operating parameter of the feed system to control a flow rate of at least one of the components to the reactor based at least on the signal.

System and method for monitoring and controlling a polymerization system

Disclosed herein are ethylene-based polymers produced using dual metallocene catalyst systems. These polymers have low densities, high molecular weights, and broad molecular weight distributions, as well as having the majority of the long chain branches in the lower molecular weight component of the polymer, and the majority of the short chain branches in the higher molecular weight component of the polymer. Films produced from these polymers have improved impact and puncture resistance.

Low density polyolefin resins with low molecular weight and high molecular weight components, and films made therefrom

A polyolefin having a density of greater than about 0.930 g/ml which when extruded at a temperature in the range of from about 590&#xb0; F. to about 645&#xb0; F. and then coated onto a substrate at a rate of from about 300 ft/min to about 1000 ft/min has an edge weave of from about 0 in/side to about 2.5 in/side and a neck-in of less than about 3.0 in/side.

Polyethylene compositions and methods of making and using same

Disclosed herein are ethylene-based polymers having a density greater than 0.945 g/cm, a high load melt index less than 25 g/10 min, a peak molecular weight ranging from 52,000 to 132,000 g/mol, and an environmental stress crack resistance of at least 250 hours. These polymers have the processability of chromium-based resins, but with improved impact strength and stress crack resistance, and can be used in large-part blow molding applications.

Polymers with improved toughness and ESCR for large-part blow molding applications

Disclosed herein are broad molecular weight distribution olefin polymers having densities in the 0.895 to 0.930 g/cmrange, and with improved impact and tear resistance. These polymers can have a ratio of Mw/Mn in the 8 to 35 range, a high load melt index in the 4 to 50 range, less than about 0.008 LCB per 1000 total carbon atoms, and a reverse comonomer distribution.

Low density polyolefin resins and films made therefrom

Growing community of inventors

Owasso, OK, United States of America

Daniel G Hert