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The El Dorado Refinery
is run by The Frontier El Dorado Refining Company, and is part of the Frontier Oil Corporation
Frontier Oil , begun in 1949 as Wainoco Oil, is a U.S. energy company. Its headquarters are located in Houston, TX, and its subsidiary company, Frontier Refining & Marketing, Inc., is located in Denver, CO...
. The refinery is located in El Dorado
El Dorado is a city situated along the Walnut River in the central part of Butler County, located in south-central Kansas, in the Central United States. As of the 2010 census, the city population was 13,021. It is the county seat and most populous city of Butler County...
, Butler County
Butler County is a county located in South Central Kansas, in the Central United States. As of the 2010 census, the county population was 65,880. Its county seat and most populous city is El Dorado. The county is a part of the Wichita Metropolitan Statistical Area.-19th century:It was named in...
in South Central Kansas
Kansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...
. It has a crude distillation unit with a capacity of 110 kbpd.