Butene-1 Recovery Process by Snamprogetti

Application: The Snamprogetti butene-1 recovery technology allows extracting a C4 cut as a very high-purity butene-1 stream that is suitable as a comonomer for polyethylene production.

Feed: Olefinic C4 streams from steam cracker or fluid catalytic cracking (FCC) unit can be used as feedstock for the recovery of butene-1.

Description: The Snamprogetti process for butene-1 is based on proprietary binary interaction parameters that are specifically optimized after experimental work to minimize investment cost and utilities consumption. The plant is a super-fractionation unit composed of two fractionation towers provided with traditional trays.

Depending on the C4 feed composition, Snamprogetti offers different possible processing schemes. In a typical configuration, the C4 feed is sent to the first column (1) where the heavy hydrocarbons (mainly n-butane and butenes-2) are removed as bottom stream. In the second column (2), the butene-1 is recovered at the bottom and the light-ends (mainly isobutane) are removed as overhead stream.

This plant covers a wide range of product specifications including the more challenging level of butene-1 purities (99.3 wt%–99.6 wt%).

Licensor: Snamprogetti, a company of Saipem.