Title:
GAS PHASE PRODUCTION OF POLYETHYLENE
Document Type and Number:
WIPO Patent Application WO/2021/118751
Kind Code:
A3
Abstract:
Methods for producing a polymer include contacting at least one monomer under polymerization conditions with a fluidized bed of a polymerization catalyst on a particulate support; measuring a plurality of pressures of the fluidized bed at a plurality of locations corresponding to increasing heights from a bottom of the fluidized bed; calculating a plurality of pressure drops between the plurality of locations based on the measured pressures; performing a regression analysis on the calculated plurality of pressure drops; correlating the plurality of pressure drops to corresponding heights from the bottom of the fluidized bed based on the regression analysis; determining a height of the fluidized bed based on the correlating; and controlling polymerization conditions based on the determined height of the fluidized bed. The method can also be used to detect malfunctioning pressure transducers based on deviation between measured and expected values.
Inventors:
KARIMIPOUR SHAYAN (US)
SIELOFF MICHAEL (US)
OHRAN BENJAMIN (US)
SIELOFF MICHAEL (US)
OHRAN BENJAMIN (US)
Application Number:
PCT/US2020/060205
Publication Date:
July 15, 2021
Filing Date:
November 12, 2020
Export Citation:
Assignee:
EXXONMOBIL CHEMICAL PATENTS INC (US)
International Classes:
C08F2/34; C08F2/00; C08F2/01; C08F10/00
Foreign References:
| US20070003450A1 | 2007-01-04 | |||
| EP0233787A1 | 1987-08-26 | |||
| US20120283395A1 | 2012-11-08 | |||
| US5688865A | 1997-11-18 | |||
| US6759489B1 | 2004-07-06 | |||
| US20180162969A1 | 2018-06-14 | |||
| EP0093801A2 | 1983-11-16 |
Other References:
SUN JINGYUAN ET AL: "Online measurement of particle charge density in a gas-solid bubbling fluidized bed through electrostatic and pressure sensing", POWDER TECHNOLOGY, vol. 317, 7 April 2017 (2017-04-07) - 7 April 2017 (2017-04-07), pages 471 - 480, XP085066330, ISSN: 0032-5910, DOI: 10.1016/J.POWTEC.2017.04.026
AKBARI VAHID ET AL: "2D CFD-PBM simulation of hydrodynamic and particle growth in an industrial gas phase fluidized bed polymerization reactor", CHEMICAL ENGINEERING RESEARCH AND DESIGN, ELSEVIER, AMSTERDAM, NL, vol. 104, 26 July 2015 (2015-07-26), pages 53 - 67, XP029357449, ISSN: 0263-8762, DOI: 10.1016/J.CHERD.2015.07.016
ZHANG QING ET AL: "A comparative study of electrostatic current and pressure signals in a MSFC gas-solid fluidized bed", POWDER TECHNOLOGY, vol. 287, 1 January 2016 (2016-01-01), Basel (CH), pages 292 - 300, XP055791801, ISSN: 0032-5910, DOI: 10.1016/j.powtec.2015.10.005
AKBARI VAHID ET AL: "2D CFD-PBM simulation of hydrodynamic and particle growth in an industrial gas phase fluidized bed polymerization reactor", CHEMICAL ENGINEERING RESEARCH AND DESIGN, ELSEVIER, AMSTERDAM, NL, vol. 104, 26 July 2015 (2015-07-26), pages 53 - 67, XP029357449, ISSN: 0263-8762, DOI: 10.1016/J.CHERD.2015.07.016
ZHANG QING ET AL: "A comparative study of electrostatic current and pressure signals in a MSFC gas-solid fluidized bed", POWDER TECHNOLOGY, vol. 287, 1 January 2016 (2016-01-01), Basel (CH), pages 292 - 300, XP055791801, ISSN: 0032-5910, DOI: 10.1016/j.powtec.2015.10.005
Attorney, Agent or Firm:
BAEHL, Stephen, A. et al. (US)
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