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The Nevada–Texas–Utah Retort process (also known as NTU, Dundas–Howes or Rexco process) was an above ground shale oil extraction technology to produce shale oil, a type of synthetic crude oil. It heated oil shale in a sealed vessel (retort) causing its decomposition into shale oil, oil shale gas and spent residue. The process was developed in the 1920s and used for shale oil production in the United States and in Australia. The process was simple to operate; however, it was ceased from the operation because of a small capacity and labor extensiveness. ==History== The NTU Retort was a successor of the 19th century coal gasification retorts and it is considered as a predecessor of the Gas Combustion Retort and the Paraho processes.〔〔 It was invented and patented by Roy C. Dundas and Raymond T. Howes in 1923. The process was improved by David Davis and George Wightman Wallace, a consulting engineer of the NTU Company.〔 〕〔 〕 In 1925, the NTU Company built a test plant at Sherman Cut near Casmalia, California.〔 〕〔 〕 In 1925–1929, the process was also tested by the United States Bureau of Mines in the Oil Shale Experiment Station at Anvil Point in Rifle, Colorado.〔〔 Retorting was carried out from 17 January to 28 June 1927. The plant was dismantled when work was terminated in June 1929.〔 One of the leading technologist involved in this stage was Lewis Cass Karrick, an inventor of the Karrick process.〔 〕 In 1946–1951, two pilot plants with nominal capacities of 40 tons of raw oil shale were located at the same location. More than 12,000 barrels of shale oil was produced during this period. During the World War II, three NTU retorts were operated at Marangaroo, New South Wales, Australia.〔〔 〕〔 〕 Almost 500,000 barrels of shale oil was produced by these retorts by retorting local torbanite.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nevada–Texas–Utah Retort」の詳細全文を読む スポンサード リンク
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