Process for the production of vinyltoluene

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

1981-04-02

1983-11-22

Gantz, Delbert E.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

Having alkenyl moiety, e.g., styrene, etc.

585441, C07C 536

Patent

active

044170858

ABSTRACT:
A process for the production of vinyltoluene, 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 distillation 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 crude vinyltoluene in the distillation apparatus may include a polymerization inhibitor.

REFERENCES:
patent: 2402740 (1942-02-01), Doumani et al.
patent: 2683180 (1954-07-01), Amos et al.
patent: 3256355 (1966-06-01), Gilman et al.
Chem. Engineers' Handbook, Perry and Chilton, 5 Ed. McGraw-Hill (1973) pp. 13-17.

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