Photochemical system and method for the removal of pcdd or...

A - Human Necessities – 62 – D

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A62D 3/17 (2007.01) A62D 3/176 (2007.01) A62D 3/37 (2007.01) B01D 46/02 (2006.01) C04B 12/00 (2006.01) B01D 53/70 (2006.01)

Patent

CA 2445946

A photochemical process for removing or minimizing the concentration of PCDD or PCDF compounds within an industrial gas stream. The process includes the direct photolysis of PCDD or PCDF compounds. Light within a particular spectral range is irradiated (28) into the gas stream and is absorbed by the PCDD and PCDF compounds in the presence of a hydrogen donor and this results in producing a lower chlorinated PCDD or PCDF compound form. In addition, the gas stream may be treated (22) by removing particular matter therefrom and thereafter subjected to the above-described irradiation (28). Further, as another optional step, the gas stream may be irradiated (14) with the specific purpose of targeting PCDD and PCDF precursor compounds. In this case, the irradiation is absorbed by the precursor compounds causing them to be chemically modified to different compounds that do not participate in chemical reactions that result in the formation of PCDD and PCDF compounds.

Procédé photochimique pour évacuer les composés PCDD ou PCDF dans un flux de gaz industriel ou réduire au minimum leur concentration. Il comprend la photolyse directe des composés PCDD ou PCDF. On éclaire (28) le flux gazeux avec de la lumière ayant une gamme spectrale déterminée, qui est absorbée par les composés PCDD ou PCDF en présence d'un donneur d'hydrogène, ce qui donne une forme de composés PCDD ou PCDF à plus faible teneur en chlore. En outre, le flux gazeux peut être traité (22) par l'évacuation de la matière particulaire puis éclairé de la manière décrite ci-dessus (28). De plus, un stade supplémentaire peut comprendre l'éclairage (14) du flux gazeux qui vise spécialement les composés précurseurs de PCDD et PCDF. Dans ce cas de figure, la lumière est absorbée par les composés précurseurs et modifiée chimiquement de manière à se transformer en des composés différents qui ne participent pas aux réactions chimiques menant à la formation de composés PCDD ou PCDF.

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