Sulphur is perhaps the polymerization inhibitor most commonly employed to inhibit polymerization of vinyl aromatic compounds during distillation since sulphur does provide effective inhibition in. The process comprises subjecting a vinyl aromatic compound to elevated temperatures in a distillation system in the presence of a new polymerization inhibitor comprising 2 6 dinitro p cresol. In other aspects this invention is directed to a vinyl aromatic composition stabilized against polymerization by such polymerication inhibitor composition.
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