Hydrocarbon dehydrogenation to olefins - using iodine, oxygen and iodide acceptor, in separate dehydrogenation, accepting and iodine regeneration zones

摘要

Hydrocarbons are converted to mono- and diolefins by dehydrogenation at 450-570 degrees C in presence of I2, O2 and a content acceptor for HI formed in dehydrogenation, HI is accepted at 430-550 degrees C. I2 is regenerated from contact by means of O2 at 450-650 degrees C. Dehydrogenation, accepting and regeneration are separately carried out, in appts. zones joined to one another. Dehydrogenation zone is set between accepting and regeneration zones. 90-30% O2, w.r.t. total quantity, is charged to regeneration step. and 10-70% to dehydrogenation step. Prods. are used as monomers and intermediates in prodn. of synthetic rubber and plastics. Process may be used for prepn. of divinyl from n-butane, and n-butylenes, isobutylene from isobutene, isoprene from isopentane and isoamylenes, styrene from ethylbenzene, vinyl toluene from ethyltoluenes. Each step can take place under optimum conditions. End-prods. yield is increased.