Process for cracking an olefinic feed comprising diolefins and monoolefins

A process for cracking an olefinic feed comprising diolefins and monoolefins, the process comprising:

• a) selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert diolefins to monoolefins and provide a hydrogenated effluent stream;
• b) vaporizing the hydrogenated effluent stream in a vaporizer to provide a vaporized hydrogenated effluent stream;
• c) passing the vaporized hydrogenated effluent stream to an olefin cracking reactor to provide a cracked olefin stream comprising C2 and C3 olefins;
• d) passing the cracked olefin stream to a recycle column to provide a first vapor stream comprising C6+ hydrocarbons, and a second vapor stream comprising C5− hydrocarbons;
• and
• e) recycling the first vapor stream to the olefin cracking reactor;
• and
• f) passing the second vapor stream to a depropanizer column to provide C2 and C3 olefins.

A process for cracking an olefinic feed comprising diolefins and monoolefins, the process comprising:

• a) selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert diolefins to monoolefins and provide a hydrogenated effluent stream;
• b) vaporizing the hydrogenated effluent stream in a vaporizer to provide a vaporized hydrogenated effluent stream;
• c) passing the vaporized hydrogenated effluent stream to an olefin cracking reactor to provide a cracked olefin stream comprising C2 and C3 olefins;
• d) passing the cracked olefin stream to a recycle column to provide an overhead vapor stream comprising C5− hydrocarbons and a bottoms liquid stream comprising C6+ hydrocarbons;
• and
• e) recycling at least a portion of the overhead vapor stream to the olefin cracking reactor.