Microcontaminants in pentachlorophenol synthesis. 3. Effect of temperature and chlorine flow rate at end of run

Jianli Yu, Terry J. Nestrick, Phillip E. Savage

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Polychlorinated dibenzodioxins (PCDDs) and dibenzofurans (PCDFs) are undesired byproducts that form as microcontaminants during the synthesis of pentachlorophenol. In temperature-programmed, laboratory-scale synthesis, most of the microcontaminant toxicity forms near the end of the run and while the molten pentachlorophenol product cools and solidifies. Terminating the chlorine feed to the reactor before the end of the run, where some tetrachlorophenol remains, prevented the formation of microcontaminants in high concentrations in the final product. Therefore, it appears that the microcontaminant-forming reactions that occur near the end of the run are inhibited by creating chlorine starvation conditions in the reaction system. In a commercial implementation of this strategy, it may also be beneficial to purge the reactor contents with an inert gas after stopping the chlorine flow to remove the residual chlorine.

Original languageEnglish (US)
Pages (from-to)5211-5216
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume45
Issue number15
DOIs
StatePublished - Jul 19 2006

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Pentachlorophenol
Chlorine
Flow rate
Noble Gases
Temperature
Inert gases
Byproducts
Toxicity
Molten materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

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title = "Microcontaminants in pentachlorophenol synthesis. 3. Effect of temperature and chlorine flow rate at end of run",
abstract = "Polychlorinated dibenzodioxins (PCDDs) and dibenzofurans (PCDFs) are undesired byproducts that form as microcontaminants during the synthesis of pentachlorophenol. In temperature-programmed, laboratory-scale synthesis, most of the microcontaminant toxicity forms near the end of the run and while the molten pentachlorophenol product cools and solidifies. Terminating the chlorine feed to the reactor before the end of the run, where some tetrachlorophenol remains, prevented the formation of microcontaminants in high concentrations in the final product. Therefore, it appears that the microcontaminant-forming reactions that occur near the end of the run are inhibited by creating chlorine starvation conditions in the reaction system. In a commercial implementation of this strategy, it may also be beneficial to purge the reactor contents with an inert gas after stopping the chlorine flow to remove the residual chlorine.",
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Microcontaminants in pentachlorophenol synthesis. 3. Effect of temperature and chlorine flow rate at end of run. / Yu, Jianli; Nestrick, Terry J.; Savage, Phillip E.

In: Industrial and Engineering Chemistry Research, Vol. 45, No. 15, 19.07.2006, p. 5211-5216.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microcontaminants in pentachlorophenol synthesis. 3. Effect of temperature and chlorine flow rate at end of run

AU - Yu, Jianli

AU - Nestrick, Terry J.

AU - Savage, Phillip E.

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Y1 - 2006/7/19

N2 - Polychlorinated dibenzodioxins (PCDDs) and dibenzofurans (PCDFs) are undesired byproducts that form as microcontaminants during the synthesis of pentachlorophenol. In temperature-programmed, laboratory-scale synthesis, most of the microcontaminant toxicity forms near the end of the run and while the molten pentachlorophenol product cools and solidifies. Terminating the chlorine feed to the reactor before the end of the run, where some tetrachlorophenol remains, prevented the formation of microcontaminants in high concentrations in the final product. Therefore, it appears that the microcontaminant-forming reactions that occur near the end of the run are inhibited by creating chlorine starvation conditions in the reaction system. In a commercial implementation of this strategy, it may also be beneficial to purge the reactor contents with an inert gas after stopping the chlorine flow to remove the residual chlorine.

AB - Polychlorinated dibenzodioxins (PCDDs) and dibenzofurans (PCDFs) are undesired byproducts that form as microcontaminants during the synthesis of pentachlorophenol. In temperature-programmed, laboratory-scale synthesis, most of the microcontaminant toxicity forms near the end of the run and while the molten pentachlorophenol product cools and solidifies. Terminating the chlorine feed to the reactor before the end of the run, where some tetrachlorophenol remains, prevented the formation of microcontaminants in high concentrations in the final product. Therefore, it appears that the microcontaminant-forming reactions that occur near the end of the run are inhibited by creating chlorine starvation conditions in the reaction system. In a commercial implementation of this strategy, it may also be beneficial to purge the reactor contents with an inert gas after stopping the chlorine flow to remove the residual chlorine.

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