文献类型：期刊文献

英文题名：Investigations on product distribution and oxygen removal in the newly two-stage catalytic lignite liquefaction process

作者：Zhao, Runze[1]; Huang, Sheng[1]; Wu, Youqing[1]; Wu, Shiyong[1]; Gao, Jinsheng[1]

机构：[1] Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai, 200237, China

年份：2019

外文期刊名：36th Annual International Pittsburgh Coal Conference: Clean Coal-Based Energy/Fuels and the Environment, PCC 2019

收录：EI(收录号：20203809205748)

语种：英文

外文关键词：Hydrogen - Oxygen - Macromolecules - Iron compounds - Lignite

摘要：Lignite is a promising feedstock for hydro-liquefaction as its abundant resources and high reactivity. However, its high oxygen and moisture contents limit its utilization in direct liquefaction due to the deoxygenation reaction that occurs during liquefaction in the presence of an iron-based catalyst consumes a large amount of hydrogen and produces water, resulting in a decrease in hydrogen partial pressure, further detrimental to hydro-liquefaction. In this paper, a newly two-stage catalytic lignite liquefaction process was proposed for optimizing the catalytic conditions in lignite liquefaction to obtain high conversion and oil yield. The first-stage lignite liquefaction was carried out in an autoclave at a temperature of 400 °C and a hydrogen pressure of 4.0 MPa, with the addition of Na2CO3. The second-stage lignite liquefaction was to sequentially hydrogenate the Na2CO3.-treated lignite obtained in the first stage over FeOOH at a temperature of 450 °C and a hydrogen pressure of 4.0 MPa. Results showed that the proposed two-stage catalytic lignite liquefaction process could achieve higher conversion than a single liquefaction process, and significantly promote the conversion of preasphaltene and asphaltene to oil in lignite liquefaction. It was found that the first stage treatment over Na2CO3 presented a lower hydrogen consumption than that over FeOOH. The addition of Na2CO3. could effectively promote the cleavage of oxygen-containing groups and reduce the oxygen in the lignite structure. Through the two-stage liquefaction process, it can eliminate the adverse effects of large amount of water generated during the liquefaction of lignite on the macromolecular structure hydrogenation of lignite. ? 2019 36th Annual International Pittsburgh Coal Conference: Clean Coal-Based Energy/Fuels and the Environment, PCC 2019. All rights reserved.