Polyethylene production with multiple polymerization reactors

a polyethylene and polymerization reactor technology, applied in chemical/physical/physical-chemical stationary reactors, chemical apparatus and processes, chemical/physical/physical-chemical processes, etc., can solve the problems of polyethylene polymer production in the reactor system, affecting the production efficiency of polyethylene polymer, and affecting the operation efficiency of the polyethylene reactor system

Active Publication Date: 2017-01-26
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach ensures reliable and stable polyethylene production by maintaining velocity and pressure within specified ranges, reducing the risk of fouling and downtime, and maintaining consistent product quality.

Problems solved by technology

In some instances, unfortunately, the flow of slurry that is transferred from one reactor to the next may become unstable or the transfer slurry flow is lost or greatly reduced, giving unstable production of polyethylene polymer in the reactor system, fouling of the slurry transfer line, and so on.
Such problematic operation may result in off-spec polyethylene polymer and downtime of the polyethylene reactor system.

Method used

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  • Polyethylene production with multiple polymerization reactors
  • Polyethylene production with multiple polymerization reactors
  • Polyethylene production with multiple polymerization reactors

Examples

Experimental program
Comparison scheme
Effect test

embodiment a

[0121]A method of operating a polyethylene reactor system, comprising: discharging continuously a transfer slurry from a first polymerization reactor through a transfer line to a second polymerization reactor, the transfer slurry comprising diluent and a first polyethylene; discharging a product slurry from a second polymerization reactor, the product slurry comprising diluent, the first polyethylene, and a second polyethylene; determining a pressure loss due to friction in the transfer line, and adjusting a process variable in response to the pressure loss exceeding a specified value.

embodiment b

[0122]The method of embodiment A, wherein the first polymerization reactor and the second polymerization reactor each comprise a liquid-phase reactor.

embodiment c

[0123]The method of embodiments A through B, wherein the first polymerization reactor and the second polymerization reactor each comprise a loop reactor.

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Abstract

A system and method for discharging a transfer slurry from a first polymerization reactor through a transfer line to a second polymerization reactor, the transfer slurry including at least diluent and a first polyethylene. A product slurry is discharged from the second polymerization reactor, the product slurry including at least diluent, the first polyethylene, and a second polyethylene. The velocity, pressure drop, or pressure loss due to friction in the transfer line is determined, and a process variable adjusted in response to the velocity, pressure drop, or pressure loss not satisfying a specified value.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. patent application Ser. No. 13 / 713,232 filed on Dec. 13, 2012 and U.S. patent application Ser. No. 13 / 687,170 filed on Nov. 28, 2012, which claims priority to Ser. No. 12 / 785,333, filed on May 21, 2010 and issued as U.S. Pat. No. 8,344,078 on Jan. 1, 2013.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates generally to polyethylene production and, more specifically, to operating a transfer slurry between two or more polyethylene polymerization reactors.[0004]2. Description of the Related Art[0005]This section is intended to introduce the reader to aspects of art that may be related to aspects of the present invention, which are described and / or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understoo...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C08F2/01B01J19/00B01J19/24C08F10/02
CPCC08F2/01C08F10/02B01J19/0006B01J2219/24B01J19/245B01J2219/00162B01J19/2455B01J19/1837B01J2208/0007B01J2208/00088B01J2219/00033B01J2219/0006B01J2219/00164B01J19/2435C08F210/16C08F2/14C08F2/001B01J19/06B01J19/242
InventorBHANDARKAR, MARUTIBENHAM, ELIZABETH ANNGONZALES, REBECCA A.KUFELD, SCOTT E.MUTCHLER, JOEL A.GILL, CATHERINE M.NGUYEN, THANH T.ODI, TIMOTHY O.
OwnerCHEVRON PHILLIPS CHEMICAL CO LP