Webcast Alert: Lyondell President & Chief Executive Officer to Address 17th Annual Credit Suisse First Boston Chemical Conference

HOUSTON, Sep 22, 2004 /PRNewswire-FirstCall via COMTEX/ -- Dan F. Smith, President and Chief Executive Officer of Lyondell Chemical Company (NYSE: LYO), will address analysts at the following event:

     Analyst               Credit Suisse First Boston 17th Annual Chemical
     Conference:           Conference in New York, Tuesday, September 28,
                           2004, at 2:30 p.m. Eastern Time.

     Web Site Access:      Live audio-only webcasting will be provided in
                           RealPlayer(TM) and Windows Media formats.
                           Beginning at 2:30 p.m. Eastern Time on the day of
                           the event, the webcast can be accessed at
                           http://www.lyondell.com/investorpresentations .

                           The replay webcast will be available by 5:00 p.m.
                           Eastern Time on September 29, 2004 at
                           http://www.lyondell.com/investorpresentations .
                           The replay will be available until October 29,
                           2004.

     Presentation:         The slides will be available at the time of the
                           presentation 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.

SOURCE Lyondell Chemical Company

media, Susan P. Moore, +1-713-309-4645, or investors, Douglas
J. Pike, +1-713-309-7141, both of Lyondell Chemical Company

http://www.lyondell.com

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