Patent ID: 6740791
Filing Date: 2004-05-25
Classification: C07C,C10G,Y02P,Y10S

Abstract:
A process for converting an oxygenate to olefina, the process comprising:providing a feedstock comprising the oxygenate, converting at least a portion of the oxygenate into an olefin-containing effluent in an oxygenate conversion reactor, transferring heat from at least a portion of the effluent to the feedstock to cause at least a portion of the feedstock to vaporize and form a vaporized feedstock, wherein the transferring heats the feedstock from a first temperature to a second temperature, quenching the effluent with a medium at an initial temperature and in an amount sufficient for forming a light product fraction and a heavy product fraction wherein the light product fraction comprises light olefins and the heavy product fraction has a final temperature which is higher than the first temperature by at least 5Â° C, fractionating at least a portion of the heavy product fraction in a fractionator under conditions effective to form a plurality of fractionated streams, and heating the feedstock with at least one of the fractionated streams.