![]() ![]() In 1978 Diamond Shamrock moved its headquarters to Dallas. At the time of the merger the company produced about 20 percent oil and gas and 80 percent chemicals. In 1967 Diamond Alkali merged with Shamrock Oil and Gas of Amarillo. A facility was opened in Delaware City, Delaware and additional chemical companies were purchased, including Chemical Process Company of Redwood City, California and the Nopco Chemical Company of New Jersey. The 1960s saw continued expansion of Diamond Alkali. During the 1950s a third plant was constructed in Muscle Shoals, Alabama, helping the company continue to enlarge its range of products, expanding to produce plastics and chemicals for agriculture. In 1948 the company moved its headquarters from Pittsburgh to Cleveland, Ohio. ![]() In Deer Park, Houston, Texas, in 1946 a new plant was built to produce Chlorine and Caustic soda. A factory was built in Painesville, Ohio, in 1912 to produce soda ash.ĭuring the 1920s, TR Evans led Diamond Alkali, which under his leadership became an important chemical producer.Īfter World War II Ray Evans, TR's son, led the company to decentralize its operations. They wanted the company to produce soda ash, a key ingredient in glass production. In 1910 a group of glass manufacturers founded Diamond Alkali in Pittsburgh, Pennsylvania. The origins of Diamond Shamrock can be traced back to three foundation companies: Diamond Alkali, Shamrock Oil and Gas, and Sigmor Corporation.ġ910-1983 Diamond Alkali Since 2001, it operates as a brand of Valero and has withdrawn the brand from a majority of Texas gas stations and had converted most of the stores to Valero or sold them off to Texaco or other companies. or Diamond Shamrock Refining and Marketing was an oil refinery and gas station company in the United States, headquartered in San Antonio, Texas. California, Colorado, Georgia, New Mexico, Texasĭiamond Shamrock Corp. ![]()
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