Shengli lignite liquefaction under syngas and complex solvent

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• 作者：Qiang-lin LI^a ; Zhuo CHEN^a ; Qun ZHOU^a ; Li DAI^a ; Liang LI^a ; Shi-yong WU^a ; ^b ; ^{wsy@ecust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：syngas ; complex solvent ; Shengli lignite ; direct liquefaction
• 刊名：Journal of Fuel Chemistry and Technology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：44
• 期：3
• 页码：257-262
• 全文大小：1194 K

文摘

The liquefaction of Shengli lignite (SL) were studied in the system of syngas (H₂+CO) and complex solvent (H₂O+THN) and the system of hydrogen (H₂) and tetralin (THN). Asphaltene (AS) and preasphaltene (PA) from the two systems were characterized by FT-IR. The results show that both conversion and oil yield of Shengli lignite liquefaction in the (H₂+CO)/(H₂O+THN) system are significantly higher than those in the H₂/THN system. The conversion and oil yield under syngas (H₂:CO (volume ratio)=1:1) and complex solvent (THN:H₂O (volume ratio)=1:1) reach respectively 88.79% and 55.47% at 400°C, 4 MPa and 30 min. The differences in the conversion and oil yield between the (H₂+CO)/(H₂O+THN) and H₂/THN systems are 8.00% and 7.54%, respectively. This suggests that the water-gas shift reaction can produce active hydrogen in the (H₂+CO)/(H₂O+THN) system, which benefits the hydrogenation of SL and PA. Meanwhile, THN can stabilize the free radicals from SL pyrolysis and dissolve the products (AS and PA) from SL liquefaction. The synergistic effect of two factors results in the improvement of conversion and oil yield. This study shows that it is a new lignite liquefaction technology using the (H₂+CO)/(H₂O+THN) system.