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Consider novel CGC and front-end depropanizer system for olefins production

05.01.2013  |  Xu, Q.,  Lamar University, Beaumont, TexasFu, J. ,  Lamar University, Beaumont, TexasZhao, C. ,  Lamar University, Beaumont, Texas

In the presented case study, an innovative design for an integrated CGC-DeC3 system introduces part of the heavier condensate from the early compression stages directly into the high-pressure (HP) depropanizer.

Keywords: [olefins] [ethylene] [propylene] [refrigeration] [compressor] [trays] [reboiler]

In many liquid-cracking ethylene facilities, the multistage charge-gas compressor (CGC) is used with a front-end depropanizer (DeC3) process. The optimal design and operation of an integrated CGC-DeC3 system can provide energy savings and other benefits. In the presented case study, an innovative design for an integrated CGC-DeC3 system introduces part of the heavier condensate from the early compression stages directly into the high-pressure (HP) depropanizer. Result: The compression work and CGC stripper loading are reduced. This design also lowers heat duty for part of the heat-exchanger network. Using rigorous simulation, this new conceptual design can offer significant energy-saving potential.

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