Union Carbide Chemicals & Plastics Technology Corporation

Dow Technology Investments LLC

Gary Lynn Culp

Kenneth A Nielsen

Madan Mohan Bhasin

Liping L Zhang

Harvey E Andresen

Michael L Hutchison

Michael Habenschuss

Bernie Osborne

James Russell Nelson

Clarence P Stadlwieser

Vincent Joseph Stricker

Steven R Osborne

John P Dever

Andrew Addie

Processes and systems for purifying ethylene oxide, including introducing a feed stream including ethylene oxide to a heat exchanger to heat the feed stream, feeding the heated feed stream to a distillation apparatus base below a first stage, removing from the distillation apparatus an impurity fraction as a top exit stream from the distillation apparatus located at a top take-off on the distillation apparatus, removing from the distillation apparatus an ethylene oxide stream of 99.7 weight percent purity, based on the total weight of the ethylene oxide stream, from the distillation apparatus, and removing from the distillation apparatus an aldehyde enriched fraction as a bottom stream from the distillation apparatus, where the aldehyde enriched fraction is fed directly to a glycol reactor.

Alkylene oxide purification processes and systems

The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.

Methods for manufacturing olefins from lower alkans by oxidative dehydrogenation

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Kenna, WV, United States of America

Gary Lynn Culp