June 2012

Special Report: Process/Plant Optimization

Recover valuable olefins from offgas streams

Catalytic technology aids in removal of acetylenes, NOx and oxygen

Blankenship, S., Sun, M., Urbancic, M. A., Sud-Chemie Inc.; Rajesh, R, Zoldak, R., Su¨d-Chemie Inc

To effectively separate valuable hydrocarbons from fluid catalytic cracking (FCC) and deep catalytic cracking (DCC) offgas streams, much depends on the catalytic design concept applied for selective hydrogenation. In the past, FCC and DCC offgas streams typically have been used only for fuel. However, these streams contain hydrocarbons and other materials that have considerable additional value, such as hydrogen, ethylene and propylene, in significant concentration ranges of 5–20 vol%. Until relatively recently, it has been economically prohibitive to recover these components because the offgas streams usually also contain a wide range of problematic impurities, such as heavy metals

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