Citation
Ali, Salmiaton and Garforth , A.
(2007)
Waste catalysts for waste polymer.
Waste Management, 27 (12).
pp. 1891-1896.
ISSN 0956-053X
Abstract
Catalytic cracking of high-density polyethylene (HDPE) over fluid catalytic cracking (FCC) catalysts (1:6 ratio) was carried out using
a laboratory fluidized bed reactor operating at 450 C. Two fresh and two steam deactivated commercial FCC catalysts with different
levels of rare earth oxide (REO) were compared as well as two used FCC catalysts (E-Cats) with different levels of metal poisoning. Also,
inert microspheres (MS3) were used as a fluidizing agent to compare with thermal cracking process at BP pilot plant at Grangemouth,
Scotland, which used sand as its fluidizing agent. The results of HDPE degradation in terms of yield of volatile hydrocarbon product are
fresh FCC catalysts steamed FCC catalysts used FCC catalysts. The thermal cracking process using MS3 showed that at 450 C, the
product distribution gave 46 wt% wax, 14% hydrocarbon gases, 8% gasoline, 0.1% coke and 32% nonvolatile product. In general, the
product yields from HDPE cracking showed that the level of metal contamination (nickel and vanadium) did not affect the product
stream generated from polymer cracking. This study gives promising results as an alternative technique for the cracking and recycling
of polymer waste.
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