Abstract:

The vacuum pyrolysis of waste TV housings （high impact polystyrene, HIPS） containing decabromodipheny） ether was carried out, and the pyrolysis characteristics of flame retardant and plastics in different heating conditions were investigated. Experimental results indicate that   as compared with the flash pyrolysis, the controlled two-step slow pyrolysis is beneficial to the selective distribution of brominated compounds, thus making a large amount of highly-brominated compounds accumulate in Step 1 but relatively fewer lowly-brominated compounds in Step 2;   the controlled pyrolysis significantly influences the products yield and distribution; and   more products with single-benzene ring can be obtained due to the slow heating, thus avoiding the occurrence of any polyreaction at high temperature.

Key words: flame retardant, polybromodiphenyl ether, high impact poystyrene, vacuum pyrolysis