1,4-Diethylbenzene → p-Divinylbenzene

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Divinylbenzene can be prepared by the dehydrogenation of diethylbenzene. For example, there is a description in EP 0217492 A1 that the dehydrogenation of para-diethylbenzene with a purity of 93% in the presence of an alkaline dehydrogenation catalyst at a temperature of 620° to 630° C. and at a steam to diethylbenzene ratio (hereinafter referred to as S/D ratio) of 2 to 4 (by weight) occurred at a conversion of approximately 80% to yield approximately 38% by weight of para-divinylbenzene and approximately 30% by weight of para-ethylvinylbenzene. Another description is found in Japan Kokai Tokkyo Koho No. Sho 62-45,542 (1987) that diethylbenzene was dehydrogenated to divinylbenzene at a conversion of approximately 78% with a selectivity (mol) to divinylbenzene of approximately 55% under the conditions where the inlet temperature of the catalyst layer was 620° C., the LHSV based on diethylbenzene was 1 hr-1 and the S/D ratio was 3.

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