PROCESS FOR PRODUCING LOWER OLEFINS FROM HYDROCARBON FEEDSTOCK UTILIZING PARTIAL VAPORIZATION AND SEPARATELY CONTROLLED SETS OF PYROLYSIS COILS

摘要

A process for making lower olefins from a wide boiling range hydrocarbon feed by use of a combination of one or more vapor/liquid separation devices, and then pyrolytically cracking the vapor phase in separate sets of pyrolysis radiant tubes, thereby producing a higher level of lower olefin product.