Upgrading of Bitumen in the Presence of Hydrogen and Carbon Dioxide in Supercritical Water
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- 作者：Takafumi Sato ; Tomoyuki Tomita ; Phan Hieu Trung ; Naotsugu Itoh ; Shinya Sato ; Toshimasa Takanohashi
- 刊名：Energy & Fuels
- 出版年：2013
- 出版时间：February 21, 2013
- 年：2013
- 卷：27
- 期：2
- 页码：646-653
- 全文大小：310K
- 年卷期：v.27,no.2(February 21, 2013)
- ISSN：1520-5029
文摘
Upgrading of bitumen was examined in supercritical water (SCW) and its mixtures with hydrogen and carbon dioxide using semibatch reactors. Coke formation became prominent above 673 K in SCW and 693 K for SCW + H2 + CO2. Coke yield in SCW was higher than that in SCW + H2 + CO2, implying that coke formation is suppressed in SCW + H2 + CO2. The asphaltenes obtained with SCW + H2 + CO2 had higher H/C atomic ratios than those of the raw asphaltene or asphaltene obtained with SCW. The average molecular structures of raw asphaltene, as well as asphaltene in SCW and in SCW + H2 + CO2, were estimated. From the properties of asphaltene, repolymerization during decomposition of asphaltene was probably inhibited in SCW + H2 + CO2. Furthermore, the oil formed in SCW + H2 + CO2 was removed from the reactor more easily than that in SCW. The removal of oil from the reactor and the hydrogenation of asphaltene through reverse water-gas-shift reaction probably suppressed coke formation in SCW + H2 + CO2.