1,3-Butadiene → Naphthalene

Participants

Reaction Steps

A 60% solution of THAQ was obtained by adding butadiene to a 50% o-xylene solution of naphthoquinone obtained by the catalytic vapor phase oxidation reaction of naphthalene, followed by the Diels-Alder reaction. Ten kg of such a solution was subjected to distillation under reduced pressure at 95° C. under 100 Torr to reduce the content of the solvent to 2.5%. Then, while maintaining the melt at 120° C., 6 kg of the melt thus obtained was droped in an amount of about 0.2 g per drop with an interval of every about 0.4 second onto a stainless belt flaker of 60° C. The belt was moved at a cooling time of about 30 seconds, and the solidified product was peeled off by a scraper at the end. The releasability was extremely good.

Provenance & Evidence