Process for the production of vinyltoluene

Details Process for the production of vinyltoluene Process for the production of vinyltoluene

C - Chemistry, Metallurgy

07

C

202/86, 260/682.

C07C 15/44 (2006.01) C07C 15/46 (2006.01)

Patent

CA 1162944

Abstract of the Disclosure A process for the production of vinyltol- uene, comprising the steps of: producing a crude vinyltoluene product by the catalytic dehydrogenation of ethyltoluene; removing compounds from the crude vinyltoluene product which have a higher molecular weight than vinyltoluene to form a prepurified crude vinyltoluene product; and fractionally distilling the prepurified crude vinyltoluene product in a distilla- tion apparatus to recover purified vinyltoluene. The higher molecular weight compounds removed are compounds which foster the conversion of vinyltoluene into cross- linked polymer. The compounds removed preferably have more than 11 carbon atoms. In one embodiment, the step of removing higher molecular weight compounds comprises condensing a vaporous crude vinyltoluene product to form a crude vinyltoluene solution, and subjecting the crude vinyltoluene solution to flash distillation to form a vaporous prepurified crude vinyltoluene product. Optionally, the prepurified rude vinyltoluene in the distillation apparatus may include a polymerization inhibitor.

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