The present invention relates to a process for selectively producing C.sub.3 olefins from a catalytically cracked or thermally cracked naphtha stream by fractionating the naphtha feed to obtain at least a C.sub.6 rich fraction and feeding the C.sub.6 rich fraction into a reaction stage at a point wherein the residence time of the C.sub.6 rich fraction is minimized.

 
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> Startup of an olefins production plant

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