The effect of vacuum degree, heating rate and final temperature on gaseous pollutants' migration characteristics are discussed in this study, by means of vacuum pyrolysing the epoxy resin powder of waste printed circuit boards with tube furnace and analyzing the organic and inorganic constituents in the condensate gaseous products by GC/MS and IC. The result indicates that the major organics are phenol and benzene series and the major inorganics are HBr, NO_2, and SO_2, in the condensate gaseous products. An increase of the vacuum degree can reduce the yield of gas phase, the content of phenol, NO_2 and SO_2, while enhancing the content of benzene series and HBr in the gas phase. An increase of the heating rate can reduce the gas phase yield and the content of phenol, while enhancing the content of benzene series in the gas phase. An increase of the final temperature can decrease the content of phenol and benzene series, while enhancing the content of HBr. SO_2, and NO,. In order to reduce the gaseous pollutants generated in vacuum pyrolysis, the optimum pyrolysis conditions are a vacuum degree of 0.09 MPa. a heating rate of 10°C/min and a final temperature of 500°C.
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