Process for the production of cyclopentene from dicyclopentadiene
AssigneeBayer Aktiengesellschaft
InventorsHubert Lauer, Norbert Schenk, Wulf Schwerdtel
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Abstract
Producton of cyclopentene by splitting of dicyclopentadiene to produce cyclopentadiene and hydrogenating the cyclopentadiene to produce the cyclopentene in crude form, and distilling the crude cyclopentene to separate low boilers and high boilers therefrom and provide the cyclopentene product. The high boilers are recycled to the dicyclopentadiene splitting stage and serve to reduce resin formation in that stage. The process is particularly effective where the dicyclopentadiene has a low content of the so-called "codimers" which, if present in sufficient amount, would reduce resin formation.
Claims17
In a process for the production of cyclopentene from dicyclopentadiene which comprises splitting dicyclopentadiene under heat to form cyclopentadiene;
- partially hydrogenating the cyclopentadiene to form a crude cyclopentene containing an impurities fraction boiling at a higher boiling point than cyclopentene and containing cyclopentane;
- purifying the crude cyclopentene by distillation in which said impurities fraction is separated from the crude cyclopentene;
- the improvement which comprises recycling at least part of the separated impurities fraction as the impurities fraction is produced in said distillation to the dicyclopentadiene splitting stage, said separated impurities fraction comprising predominantly cyclopentane.
Dependencies are inferred from the claim text.