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Hot Spot Induced Thermal Runaway Map for Polymerization Reactors.

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Title: Hot Spot Induced Thermal Runaway Map for Polymerization Reactors.
Authors: Yoder, Elijah1 (AUTHOR) epyoder@liberty.edu, Strasser, Wayne1 (AUTHOR), Kacinski, Robert1 (AUTHOR), Jones, Braden1 (AUTHOR)
Source: Macromolecular Reaction Engineering. Apr2025, Vol. 19 Issue 2, p1-13. 13p.
Subjects: Polymerization reactors, Computational fluid dynamics, Thermal stability, Thermal instability, Catalysts, Chemical reactors, Temperature effect, Polyethylene
Abstract: Low‐Density Polyethylene (LDPE) reactors have the potential for rupture because of thermal runaway from auto‐accelerating chemistry. Pockets of unmixed, highly reactive, LDPE constituents, called hot spots, are often generated by conditions within the reactor and are the main source of thermal runaway. Because of this, there is a need to define thresholds of hot spot conditions that produce runaway. Computational Fluid Dynamics is used to study an isolated LDPE sphere with varying initial temperature, initial catalyst concentration, and volume to determine which combinations promote thermal runaway. It is found that increasing both initial temperature and initial catalyst concentration increased thermal runaway likelihood, while, counter‐intuitively, hot spot volume has no effect. An LDPE runaway map is provided to quantify the combinations that result in safe reactor operation. This allows manufacturers to make more informed control actions and to determine safe reactor conditions based on local mixture composition and temperature alone. [ABSTRACT FROM AUTHOR]
Copyright of Macromolecular Reaction Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Hot Spot Induced Thermal Runaway Map for Polymerization Reactors.
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  Data: <searchLink fieldCode="JN" term="%22Macromolecular+Reaction+Engineering%22">Macromolecular Reaction Engineering</searchLink>. Apr2025, Vol. 19 Issue 2, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Polymerization+reactors%22">Polymerization reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+instability%22">Thermal instability</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactors%22">Chemical reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Polyethylene%22">Polyethylene</searchLink>
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  Data: Low‐Density Polyethylene (LDPE) reactors have the potential for rupture because of thermal runaway from auto‐accelerating chemistry. Pockets of unmixed, highly reactive, LDPE constituents, called hot spots, are often generated by conditions within the reactor and are the main source of thermal runaway. Because of this, there is a need to define thresholds of hot spot conditions that produce runaway. Computational Fluid Dynamics is used to study an isolated LDPE sphere with varying initial temperature, initial catalyst concentration, and volume to determine which combinations promote thermal runaway. It is found that increasing both initial temperature and initial catalyst concentration increased thermal runaway likelihood, while, counter‐intuitively, hot spot volume has no effect. An LDPE runaway map is provided to quantify the combinations that result in safe reactor operation. This allows manufacturers to make more informed control actions and to determine safe reactor conditions based on local mixture composition and temperature alone. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Macromolecular Reaction Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1002/mren.202400026
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1
    Subjects:
      – SubjectFull: Polymerization reactors
        Type: general
      – SubjectFull: Computational fluid dynamics
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Thermal instability
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Chemical reactors
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Polyethylene
        Type: general
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      – TitleFull: Hot Spot Induced Thermal Runaway Map for Polymerization Reactors.
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            NameFull: Yoder, Elijah
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            NameFull: Strasser, Wayne
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            NameFull: Kacinski, Robert
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              M: 04
              Text: Apr2025
              Type: published
              Y: 2025
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