Process for producing olefins

Details Process for producing olefins Process for producing olefins

2007-10-09

2007-10-09

Nguyen, Tam M. (Department: 1764)

C585S802000, C585S639000, C585S638000

Reexamination Certificate

active

10882722

ABSTRACT:
A process for producing olefins comprises providing a vapor product stream from an oxygenate to olefin reaction, the vapor product stream comprising C2to C4olefins, C2to C6carbonyl compounds and water. The vapor product stream is cooled to provide a first vapor effluent stream comprising no more than 10 wt. % water, and a liquid water-rich stream. The first vapor effluent stream, and a first wash flash vapor stream, are compressed from a first pressure to a second pressure greater than said first pressure to form a second vapor effluent stream, which is then cooled to form a cooled second effluent stream that is at least partially in the vapor state. At least part of the cooled second effluent stream is washed with a liquid alcohol-containing stream, at a third pressure greater than the first pressure but not greater than the second pressure, to produce a wash liquid stream, which comprises C3and C4olefins, and a wash vapor stream, which contains less C2to C6carbonyl compounds than the first vapor effluent stream. The wash liquid stream is exposed to a pressure of at least the first pressure but less than the third pressure to form a first wash flash liquid stream and the first wash flash vapor stream, the first wash flash vapor stream being provided for compression with the first vapor effluent stream.

REFERENCES:
patent: 6121504 (2000-09-01), Kuechler et al.
patent: 6303841 (2001-10-01), Senetar et al.
patent: 6403854 (2002-06-01), Miller et al.
patent: 6459009 (2002-10-01), Miller et al.
patent: 2002/0007101 (2002-01-01), Senetar et al.
patent: 2003/0130555 (2003-07-01), Cheng et al.

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