HOUSTON, May 4 /PRNewswire-FirstCall/ -- On May 4, 2006, the Board of Directors of Lyondell Chemical Company (NYSE: LYO) declared a regular quarterly dividend of $0.225 per share of common stock to stockholders of record as of the close of business on May 25, 2006.

The regular quarterly dividend on each share of outstanding common stock is payable in cash on June 15, 2006.

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. Lyondell is a global company operating on five continents and employs approximately 10,000 people worldwide.

SOURCE: Lyondell Chemical Company

CONTACT: media, Lisa M. Martin, +1-713-309-4890, or investors, Douglas
J. Pike, +1-713-309-7141, both of Lyondell Chemical Company

Web site: http://www.lyondell.com/