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. And b an aryl substituted phenylenediamine compound. For example common inhibitors useful for inhibiting the polymerization of vinyl aromatic compounds during storage conditions include 4 tert butylcatechol tbc and hydroquinone.
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