Patent ID: 8044254

Claim:
A process for cooling an olefin cracking reactor effluent stream, the process comprising: producing the olefin cracking reactor effluent stream in an olefin cracking reactor, wherein the olefin cracking reactor effluent stream comprises C 2 to C 3 olefins; contacting the olefin cracking reactor effluent stream with a quench oil stream in a single contact cooler contact zone to produce a cooled vapor stream and to form a heated quench oil stream; maintaining the olefin cracking reactor effluent stream at a pressure of about 7 kPa gauge to about 21 kPa gauge at an inlet of the contact cooler to increase a yield of the C 2 to C 3 olefins in the olefin cracking reactor effluent stream; and limiting a pressure difference between the inlet of the contact cooler and an outlet of the contact cooler to less than about 3.5 kPa.