When construction of Shell Chemical LP’s fourth linear alpha olefins (AO) unit at its chemicals manufacturing site in Geismar, La., is complete, the resulting 425,000-metric-ton-per-year capacity increase will make the site the largest AO producer in the world.

Shell started construction in January 2016 and has safely placed large process equipment like reactors, columns and vessels, and pre-assembled modules that will form the core of the new AO unit at Geismar. Shell has also finished building a cooling tower for the new AO unit and two new storage areas (one for rail and one for the AO unit’s high-purity butane).

The new capacity brings the total AO production at Shell’s Geismar site to more than 1.3 million metric tons per year.