Machine for planing of the tooth wheels, in particular of straight line - and obliquely toothed cone wheels

摘要

Heptenes are obtained by polymerising a stream containing propylene in the presence of diisobutyland a polymerisation catalyst at elevated temperatures and pressures. The steam to be polymerised may also contain normal and/or iso-butene. The catalyst may be copper pyrophosphate, 75%-110% phoshoric acid in bulk or as a film on quartz or phosphoric acid on kieselguhr diatomaceous earth or silica or boron trifluoride. Conditions used are 100-3,000 p.s.i.g. and 250 DEG - 550 DEG F. The mol ratio of propylene to C4 olefines and diisobutylene (calculated as isobutylene) is preferably at least 0,3 : 1, e.g. about 1 : 1. The feed may also contain paraffins, the olefine content generally being 10-70 mol per cent. and feed rates of 0,01-2 gallons per hour per pound of catalyst are used.