HOUSTON, May 5, 2005 /PRNewswire-FirstCall via COMTEX/ -- Kevin DeNicola, Sr. Vice President and Chief Financial Officer of Lyondell Chemical Company (NYSE: LYO), will address analysts at the following event:

Analyst           Goldman Sachs Basic Materials Conference 2005
      Conference:       in New York
                        Wednesday, May 18, 2005, at 9:30 a.m. Eastern Time.

      Web Site Access:  Live audio-only webcasting will be provided in
                        RealPlayer(TM) and Windows Media formats.  Beginning
                        at 9:30 a.m. Eastern Time on the day of the event, the
                        webcast can be accessed at
                        http://www.lyondell.com/investorpresentations .

                        Following the live presentation, a replay of the
                        webcast will be available at
                        http://www.lyondell.com/investorpresentations .
                        The replay will be available until November 18, 2005.

      Presentation:     The slides will be available at the time of the
                        presentation and afterwards at
                        http://www.lyondell.com/investorpresentations .

      Related           Reconciliations of non-GAAP financial measures to GAAP
      Disclosures:      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, headquartered in Houston, Texas, is North America's third-largest independent, publicly traded chemical company. Lyondell is a major global manufacturer of basic chemicals and derivatives including ethylene, propylene, titanium dioxide, styrene, polyethylene, propylene oxide and acetyls. It also is a significant producer of gasoline blending components. The company has a 58.75 percent interest in LYONDELL- CITGO Refining LP, a refiner of heavy, high-sulfur crude oil. As a result of Lyondell's November 30, 2004 acquisition of Millennium Chemicals Inc., Millennium and Equistar Chemicals, LP are wholly owned subsidiaries of Lyondell. Lyondell is a global company operating on five continents and employs approximately 10,000 people worldwide.

SOURCE Lyondell Chemical Company

media, Susan P. Moore, +1-713-309-4645, or investors, Douglas J. Pike, +1-713-309-4590, both of Lyondell Chemical Company