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Taylor, P.H.* ; Wehrmeier, A. ; Sidhu, S.S.* ; Lenoir, D. ; Schramm, K.-W. ; Kettrup, A.

Copper-catalyzed chlorination and condensation of acetylene and dichloroacetylene.

Chemosphere 40, 1297-1303 (2000)

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Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.

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The chlorination and condensation of acetylene at low temperatures is demonstrated using copper chlorides as chlorinated agents coated to model borosilicate surfaces. Experiments with and without both a chlorine source and borosilicate surfaces indicate the absence of gas-phase and gas-surface reactions. Chlorination and condensation occur only in the presence of the copper catalyst. C-2 through C-8 organic products were observed in the effluent; PCDD/F were only observed from extraction of the borosilicate surfaces. A global reaction model is proposed that is consistent with the observed product distributions. Similar experiments with dichloroacetylene indicate greater reactivity in the absence of the copper catalyst. Reaction is observed in the gas phase and in the presence of borosilicate surfaces at low temperatures. The formation of hexachlorobenzene is only observed in the presence of a copper catalyst. PCDD/F were only observed from extraction of the borosilicate surfaces. A global reaction model is proposed for the formation of hexachlorobenzene from dichloroacetylene.

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