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This research depends on treating different waste polystyrenes like; general purpose polystyrene, foamed polystyrene (styropor), high impact, and rubber modified polystyrene (HIPS) by thermal cracking in order to have liquid products which might b e used as additives to gasoline. These products are essentially aromatics and aromatic olefines of a high octane number > ١٠٠, free from sulfer and lead, and they are able to be used as octane boosters. It is possible to redistill these products in order to have styene monomer with a yield of ٤٠ - ٤٣٪, which can be used after that for polymerisation purposes.
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