Process for enhanced olefin production

A process for treating 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 C2 to C3 olefins;
• cooling the olefin cracking reactor effluent stream via indirect heat exchange with a reactor feed stream in a first heat exchange zone to produce a cooled effluent stream having a temperature in a range of about 150° C. to about 210° C.;
• contacting the cooled effluent stream with a quench oil stream in a single packed bed contact cooler contact zone to produce a cooled vapor stream having a temperature in a range of about 25° C. to about 55° C. and to form a heated oil stream, wherein the cooled effluent stream is
• maintained 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 C2 to C3 olefins in the olefin cracking reactor effluent stream;
• combining the heated oil stream with a heavy oil feed stream to produce a combined heavy oil stream;
• and
• returning a first portion of the combined heavy oil stream to the contact cooler to provide the quench oil stream.

A process for producing an increased yield of light olefins from an olefin-rich feedstock stream, the process comprising:

• introducing the olefin-rich feedstock stream comprising C4 to C8+ olefins to an olefin cracking reactor to produce an effluent stream comprising at least one of ethylene and propylene;
• cooling the effluent stream via indirect heat exchange with the olefin-rich feedstock stream in a first heat exchange zone to produce a cooled effluent stream;
• contacting the cooled effluent stream with a quench oil stream in a single packed bed contact cooler contact zone to produce a cooled vapor stream and to form a heated quench oil
• wherein the cooled effluent stream is maintained at a pressure of about 7 kPa gauge to about 21 kPa gauge at an inlet of the contact cooler contact zone to increase a reactor yield of the at least one of ethylene and propylene in the effluent stream produced by the olefin cracking reactor, and wherein a pressure difference between an effluent stream inlet of the contact cooler and a cooled vapor stream outlet of the single packed bed contact cooler is limited to less than about 3.5 kPa;
• separating the cooled vapor stream into at least one light weight stream comprising a light olefin selected from the group consisting of ethylene, propylene and combinations thereof;
• combining the heated oil stream with a heavy oil feed stream to produce a combined heavy oil stream;
• cooling the combined heavy oil stream via indirect heat exchange with a cooling medium stream in a second heat exchange zone to produce a cooled combined oil stream;
• and
• returning a first portion of the cooled combined oil stream to the single packed bed contact cooler to provide the quench oil stream.