May 2012

Petrochemical Developments

Control moisture problems in slurry-based polyolefin operations

Proper moisture removal from the polymerization-reaction medium is key to successfully operating a HDPE plant designed on low-pressure, slurry-process technology.

Mitra, S., University of Newcastle

Proper moisture removal from the polymerization-reaction medium is the key to successfully operating a high-density polyethylene (HDPE) plant designed based on low-pressure, slurry-process technology. Due to the low-pressure operation and no catalyst recovery system, the Ziegler-Natta catalyst is highly sensitive to moisture in the reaction medium. The reaction rate can be terminated due to a breakdown of the catalyst. n-Hexane serves as the reaction medium in this HDPE process; it is recycled through a comprehensive purification process that reduces water content to 10 ppm–20 ppm. Continuous operation of the mother-liquor purification unit is crucial. Too often, this purification un

Log in to view this article.

Not Yet A Subscriber? Here are Your Options.

1) Start a FREE TRIAL SUBSCRIPTION and gain access to all articles in the current issue of Hydrocarbon Processing magazine.

2) SUBSCRIBE to Hydrocarbon Processing magazine in print or digital format and gain IMMEDIATE ACCESS to the current issue as well as to 3 articles from the HP archives per month. $239 for an annual subscription.

3) Start a FULL ACCESS PLAN SUBSCRIPTION and regain IMMEDIATE ACCESS to this article, the current issue, all past issues in the HP Archive, the HP Process Handbooks, HP Market Data, and more. $1,695 for an annual subscription.  For information about group rates or multi-year terms, contact J'Nette Nichols-Davis at or +1 713.520.4426.

Related Articles

From the Archive