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Optimize operating parameters of absorbers/strippers in gas plants

08.01.2010  |  Nava, J.,  Bantrel Co., Toronto, Ontario, Canada

Better recovery definition of C3s and C4s from gas absorber/stripper can lower costs

Keywords: [gas processing] [absorber] [naphtha]

Several factors affect the recovery of C3s and C4s in gas recovery refinery type plants, typically found in delayed cokers, fluid catalytic cracking (FCC) and other downstream gas processing units. These factors include: flowrates, stream compositions, pressures, recovery specifications, solvent temperatures and volume of solvents required.1,2 Operating efficiency of the absorber/stripper gas plant section also involves the amount of lean oil entering the secondary absorber and the volume of stabilized naphtha recycled back to the primary absorber.3,4 A sensitivity study was done to optimize the design of an absorber/stripper gas plant section to improve recovery of C3s and C4s. Recovery targets of the evaluation are to be based on balancing an assumed refinery sour gas streams with liquefied petroleum gas (LPG) production while controlling both capital investment and operating costs.

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