| abstract |
Preparation of polyisobutylene whose content of terminal double bonds is more than 50% via polymerization of isobutene using a polymerization catalyst conventional for this purpose, from an industrial C<SUB>4</SUB> hydrocarbon stream which comprises 1-butene, 2-butene and isobutene and which can comprise up to 3000 ppm by weight of 1,3-butadiene, by reducing the content of oxygenates in the C<SUB>4</SUB> hydrocarbon stream, prior to polymerization of the isobutene, via contact with an inorganic adsorbent at a pressure of from 1 to 20 bar and at a temperature of from 20 to 220°C. |