Thermal behaviour of organochlorine pesticides in the presence of alkaline substances

Gruzdiewa, Ludwika; Dokurno, P.; Rak, Janusz; Błażejowski, Jerzy

doi:10.1007/bf02548903

Cited by 4 publications

(2 citation statements)

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“…The Na2CO3 reactions have slightly lower activation energies, but the vanadium oxide system had larger steric factors and produced larger extents of reaction under similar conditions. ∆ r H ) +96 kJ/mol (6) Na 2 CO 3 + C 2 H 4 Cl 2 f 2NaCl + CO 2 + H 2 O + C 2 H 2 ∆ r H ) +30 kJ/mol (7) Na 2 CO 3 + 2C 6 H 5 Cl f 2NaCl + C 6 H 6 + C 7 H 4 O 3 (8) CC(g) + Na 2 CO 3 (s) T CC (in Na 2 CO 3 )…”

Section: Resultsmentioning

confidence: 99%

“…The second method suggested is to react the chlorocarbon with alkaline salts. For example, sodium oxalate is reported to react quantitatively with chlorofluorocarbons at 550 K in circulating bed systems ( , ). Because sodium oxalate thermally decomposes to form sodium carbonate in this temperature region ( , ), sodium carbonate may have contributed to the reaction and may also react with chlorofluorocarbons in this tem perature range.…”

Section: Introductionmentioning

confidence: 99%

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Reaction between Chlorocarbon Vapors and Sodium Carbonate

Parrett

Sumner

Devore

1999

Environ. Sci. Technol.

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The kinetics of the reactions between tetrachloromethane (CCl4), 1,2-dichloroethane (C2H4Cl2), or chlorobenzene (C6H5Cl) and sodium carbonate were investigated using evolved gas analysis−Fourier transform infrared spectroscopy. Sodium carbonate reacted with CCl4 between 600 and 900 K to form over 90% carbon dioxide (CO2) and less than 10% tetrachloroethene (C2Cl4). This reaction followed the three-dimensional diffusion mechanism and had an activation energy of 105 ± 10 kJ/ mol and a steric factor of 5000 ± 3000 min-1. The reaction between C2H4Cl2 and sodium carbonate produced CO2, ethanal (C2H4O), water (H2O), vinyl chloride (C2H3Cl), ethene (C2H4), and ethyne (C2H2) between 600 and 900 K from at least two different pathways. The product temperature profiles indicated that CO2, C2H4O, and C2H3Cl were formed initially and that approximately 10% of the product is C2H4 at 900 K. The reaction kinetics followed the Ginstling−Brounshtein diffusion mechanism and had an activation energy of 100 ± 10 kJ/ mol and a steric factor of approximately 104 min-1. Benzene was produced from the reaction between chlorobenzene and sodium carbonate at temperatures above 800 K. This reaction followed the three-dimensional diffusion mechanism and had an activation energy of 80 ± 10 kJ/mol and a steric factor of approximately 500 min-1.

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Section: Resultsmentioning

confidence: 99%