Diamond Alkali

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Diamond Alkali Company was an American chemical company incorporated in 1910 in West Virginia by a group of glass industry businessmen from Pittsburgh. The company soon established a large chemical plant at Painesville, Ohio, which would operate for over sixty years. In 1948, the headquarters of the company was moved from Pittsburgh to Cleveland. In 1967, Diamond Alkali and Shamrock Oil and Gas merged to form the Diamond Shamrock Corporation. Diamond Shamrock would go on to merge with Ultramar, and the combined company, Ultramar Diamond Shamrock, would in turn be acquired by Valero Energy Corporation in 2001.