Effects of Preliminary Thermal Extraction on <i>De Novo</i> Synthesis<sup />

Tsytsik, Palina; Czech, Jan; Reggers, Guy; Carleer, Robert; Buekens, Alfons

doi:10.1089/ees.2010.0057

Cited by 2 publications

(2 citation statements)

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“…495 C), that is, a vapor pressure at room temperature between 10 4 and 10 À5 Pa. In a second article, (Tsytsik et al, 2010) the yield losses associated with sorption on the walls of semivolatiles are also evaluated.…”

Section: Target Compoundsmentioning

confidence: 99%

“…The latter are analyzed in a second article (Tsytsik et al, 2010), after conducting comparative de novo tests on samples that previously were thermally extracted. TE products are fundamentally different from those generated by de novo synthesis; the latter appear only marginally in TE products, and the comparison between TE and de novo products is the most essential feature of this study.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Extraction of Dioxin Surrogates and Precursors from Filter Dust: Effects of Temperature, Time, and Matrix

Tsytsik

Czech

Carleer

et al. 2010

Environmental Engineering Science

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This study identified potential precursors and surrogates of dioxins during thermal extraction (TE) of a sooty filter dust in a wide range of operating conditions, mainly temperature (120 C-540 C) and time, during direct thermal extraction (DTE) in a dedicated commercial analyzer and indirect thermal extraction (ITE) in a thermobalance used as desorber. Using identical analytical techniques, DTE products were monitored in the range of 120 C-320 C, and ITE products were monitored in the range of 300 C-540 C. Emphasis was on polychlorinated dibenzo-p-dioxins/furans potential precursors and surrogates: aromatic hydrocarbons as well as O, Cl, N, and S compounds. Aliphatic compounds were not monitored. Product distributions differ markedly between both TE techniques: matrix effects eliminate heteroatoms O, Cl, and N, rendering especially DTE less suitable for characterizing a complex sample. Effects of temperature and time were specific for each compound and tentatively explained by low-temperature desorption (up to 240 C) and progressive evolution of volatiles and their eventual decomposition on the matrix at higher temperature. The particular filter dust sample was selected due to its amount of volatiles and fixed carbon; it derived from a baghouse filter, cleaning off-gas from a clean aluminum scrap-melting furnace. TE results strongly diverged from those obtained by solvent-extractionbased analysis. Hence, TE cannot be recommended for analyzing complex samples. A second article compared de novo formation from samples precleaned by TE with raw samples. Such tests may differentiate between dioxin formation and carbonaceous matter (de novo route) from the precursor route involving sorbed organics. Results suggest that there is little or no resemblance between TE and de novo products. The novelty of these articles resides in monitoring numerous dioxin structurally related compounds during (1) TE under reducing conditions and (2) de novo tests in an airflow. The scope of these tests is exploratory and the results suggested strong influence of the matrix on the products evolved.

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Section: Target Compoundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%