Process for producing 5-vinyl-2-norbornene

Details Process for producing 5-vinyl-2-norbornene Process for producing 5-vinyl-2-norbornene

1995-05-26

1996-10-15

Bhat, Nina

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 38, 203 78, 203 80, 585361, 585366, B01D 334, C07C 250

Patent

active

055650694

ABSTRACT:
A process for producing 5-vinyl-2-norbornene which comprises the steps of subjecting a liquid raw material in which tetrahydroindene/dicyclopentadiene ratio (by weight) falls within the range of from 5/100 to 80/100 to a thermal decomposition in liquid phase in the presence of an aromatic hydrocarbon solvent having a boiling point of from 250.degree. C. to 300.degree. C. at a reaction temperature of not lower than 200.degree. C. and lower than 240.degree. C. for a reaction time of from 10 minutes to 120 minutes to obtain a liquid reaction mixture (A-1) composed of 50% to 70% by weight of cyclopentadiene, distilling the liquid reaction mixture (A-1) to obtain fraction (B-1) composed of 90% to 100% by weight of cyclopentadiene and fraction (B-2) composed of 60% to 90% by weight of the total of dicyclopentadiene and tetrahydroindene, further distilling the fraction (B-2) to obtain fraction (B-3) composed of 15% to 40% by weight of dicyclopentadiene and fraction (B-4) composed of 60% to 100% by weight of tetrahydroindene, recycling the fraction (B-3) into the liquid raw material, removing the fraction (B-4) out of the system, and subjecting the fraction (B-1) to a Diels Alder reaction with butadiene to obtain a liquid reaction mixture (C-1) composed of 20% to 40% by weight of 5-vinyl-2-norbornene.

REFERENCES:
patent: 3590089 (1971-06-01), Robota
patent: 4205192 (1980-05-01), Harada
patent: 4777309 (1988-10-01), Kimura et al.
patent: 5321177 (1994-06-01), Nakamura et al.
patent: 5378783 (1995-01-01), Okumura et al.

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