LYO Lyondell Chemical

Webcast Alert: Lyondell President & Chief Executive Officer to Address Banc of America Securities HOUSTON, Sept. 13 /PRNewswire-FirstCall/ -- Dan F. Smith, President and Chief Executive Officer of Lyondell Chemical Company (NYSE:LYO), will address analysts at the following event: Analyst Banc of America Securities 34th Annual Investment Conference: Conference in San Francisco, Tuesday, September 21, 2004, at 2:00 p.m. Pacific Time. A break-out session with Mr. Smith will immediately follow the presentation at 2:30 p.m. Pacific Time. Web Site Access: Live audio-only webcasting will be provided for both sessions in RealPlayer(TM) and Windows Media formats. Beginning at 2:00 p.m. Pacific Time on the day of the event, the webcasts can be accessed at http://www.lyondell.com/investorpresentations . The replay webcasts will be available by 5:00 p.m. Pacific Time on September 21, 2004 at http://www.lyondell.com/investorpresentations . The replay will be available until October 8, 2004. Presentation: The slides will be available at the time of the presentations and afterwards at http://www.lyondell.com/investorpresentations . Related Disclosures: Reconciliations of non-GAAP financial measures to GAAP financial measures and any other applicable disclosures (including the slides) will be available at the time of the presentations and afterwards at http://www.lyondell.com/investorpresentations . ABOUT LYONDELL Lyondell Chemical Company, (http://www.lyondell.com/ ), headquartered in Houston, Texas, is a leading producer of: propylene oxide (PO); PO derivatives, propylene glycol (PG), butanediol (BDO) and propylene glycol ether (PGE); and styrene monomer and MTBE as co-products of PO production. Through its 70.5% interest in Equistar Chemicals, LP, Lyondell also is one of the largest producers of ethylene, propylene and polyethylene in North America and a leading producer of ethylene oxide, ethylene glycol, high value-added specialty polymers and polymeric powder. Through its 58.75% interest in LYONDELL-CITGO Refining LP, Lyondell is one of the largest refiners in the United States processing extra heavy Venezuelan crude oil to produce gasoline, low sulfur diesel and jet fuel. DATASOURCE: Lyondell Chemical Company CONTACT: media, Susan P. Moore, +1-713-309-4645, or investors, Douglas J. Pike, +1-713-309-7141, both of Lyondell Chemical Company Web site: http://www.lyondell.com/ http://www.lyondell.com/investorpresentations

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