Patent ID: 8492492

Claim:
A system for treating a polymerization reactor effluent stream from a polymerization reactor comprising: the polymerization reactor; the polymerization reactor effluent stream, wherein the polymerization reactor effluent stream is fed from the polymerization reactor to a flash chamber; the flash chamber; a polymer product stream, wherein the polymer product stream is recovered from the flash chamber; a flash gas stream, wherein the flash gas stream is fed from the flash chamber to a first column; the first column; a first column bottom stream, wherein the first column bottom stream is recovered from the first column; a first column side stream, wherein the first column side stream is fed from the first column to the polymerization reactor, and wherein the first side stream substantially comprises hexene; a first column overhead stream, wherein the first column overhead stream is recovered from the first column an accumulator, wherein the first column overhead stream is fed from the first column to the accumulator; an accumulator bottom stream, wherein the accumulator bottom stream is fed from the accumulator to the polymerization reactor, and wherein the accumulator bottom stream substantially comprises isobutane; an accumulator overhead stream, wherein the accumulator overhead stream is fed from the accumulator to a second column; the second column; a second column overhead stream, wherein the second column overhead stream substantially comprises ethylene; and a second column bottom stream, wherein the second column bottom stream is substantially free of olefins.