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Styrene
CAS number: 100-42-5
Styrene is a colorless, flammable liquid, which has a sweet odor and is highly volatile.

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A: A purity of greater than 99% is required for styrene to be used as a feedstock for polystyrene manufacturing. This purity is achieved through a two-column distillation process, where the first column separates styrene from lighter fractions (benzene, toluene, ethylbenzene), and the second separates it from α-methyl styrene and other heavy components.