Patent ID: 8735642

Claim:
A process for cooling an olefin cracking reactor effluent stream, the process comprising: reacting a hydrocarbon feedstock including C 4 + olefins in an olefin cracking reactor, wherein the reactor is operated at a pressure from about 5 psig to 7 psig, to produce an olefin cracking reactor effluent stream; providing the olefin cracking reactor effluent stream to an inlet of a contact cooler; contacting the olefin cracking reactor effluent stream with a first quench liquid in a first contact zone in the contact cooler to produce a first bottoms stream and an intermediate vapor stream; cooling the first bottoms stream to provide a cooled first bottoms stream; contacting the intermediate vapor stream with a second quench liquid in a second contact zone in the contact cooler to produce a second bottoms stream and a cooled vapor stream; cooling the second bottoms stream to provide a cooled second bottoms stream; removing the cooled vapor stream from an outlet of the contact cooler; and passing the cooled vapor stream through a mesh blanket before removing the cooled vapor stream from the contact cooler; wherein the first quench liquid and the second quench liquid each comprise at least one C 10 + hydrocarbon to minimize vaporization of the quench liquid, and wherein the first and second contact zones each comprise a packed bed.