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《Journal of Beijing Institufe of Petrochemical Technology》 2004-01
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Measuring Gas from Catalytic Cracking by Gas Chromatography

Wu Chenglong Zhao Zhifang Li Fengyan ZhaoTianbo Gao Junbin (Department of Chemical Engineering, Beijing Institute of Petro-chemical Technology, Beijing 102617)  
Gas products in catalytic cracking of heavy oils were analyzed using 3 gas chromatographs, GC1102, GC4001 and GC2305. Based on the former analytical method, a more efficient and accurate calculation method was established. Cracking gas was analyzed by using programmed temperature rising from 50 ℃ (maintaining for 36 minutes) to 100 ℃ (maintaining for 30 minutes) at 10 ℃/min, the resolution of iso-pentane and cis-butylene, which were the hardest to separate, reached 0.96. In order to analyze carbon dioxide in flue gas, a 0.25~0.42 mm silica gel packed column was used. And a 0.25~0.42 mm 5A zeolite packed column was used in analyzing oxygen and nitrogen. As the result, the resolutions of carbon dioxide and air, carbon dioxide and impurity, oxygen and nitrogen reached 2.37, 1.59 and 1.11 respectively. Error analysis of two parallel tests showed that the standard deviation was between 0.003 0 and 0.413 4.
【CateGory Index】: O657.7
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