Microcontaminants in pentachlorophenol synthesis. 2. Effects of catalyst identity, concentration, and addition strategy

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

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Polychlorinated dibenzodioxins (PCDDs.) and dibenzofurans (PCDFs) are undesired byproducts that form as microcontaminants during the synthesis of pentachlorophenol. Using catalyst concentrations below 0.25 wt% leads to a marked increase in the toxic equivalent (TEQ) concentration of PCDDs and PCDFs in the pentachlorophenol product. With a catalyst concentration of 0.5 wt %, the TEQ concentration in the product was largely insensitive to the catalyst identity (AlCl3 vs FeCl3) and to the catalyst addition strategy (adding all at once or adding it incrementally). These results suggest that the microcontaminant-forming reactions are not catalyzed by the Lewis acid, which catalyzes the desired chlorination reaction. Thus, one must examine other process or reaction variables to identify the means to influence the microcontaminant level in pentachlorophenol.

Original languageEnglish (US)
Pages (from-to)5205-5210
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume45
Issue number15
DOIs
StatePublished - Jul 19 2006

All Science Journal Classification (ASJC) codes

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

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