Effects of temperature and solvents on structure variation of Yunnan lignite in preheating stage of direct liquefaction

Hou, Ranran; Bai, Zongqing; Pan, Hao; Dai, Xin; Xu, Junli; Zheng, Hongyan; Guo, Zhenxing; Kong, Lingxue; Bai, Jin; Li, Wen

doi:10.1016/j.fuel.2018.11.075

Cited by 18 publications

(1 citation statement)

References 46 publications

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“…Then, the structure of coal, and especially the carbon-hydrogen ratio, will undergo significant changes, converting solid coal into liquid oil. The technological process is defined as direct coal liquefaction [4,5]. As an important by-product of the direct coal liquefaction system, the yield of the direct coal liquefaction residue can reach about 30% of the raw coal.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Reaction Mechanism of Molybdenum Metal in Direct Coal Liquefaction Residue

Zhu

et al. 2022

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In this paper, the extraction residue of direct coal liquefaction residue-DCLR(ER) was used as raw material. The high-temperature reaction mechanism of Mo compound in DCLR(ER) was investigated using a synchronous thermal analyzer and the Factsage database. The high temperature reaction of DCLR(ER)-MoO3 in an oxygen atmosphere consists of pyrolysis of organic components at 400–600 °C, molybdenum trioxide sublimation at 747–1200 °C, and a stable stage at 600–747 °C. The thermal reaction process of the DCLR(ER)-MoS2 system in the oxygen atmosphere involves the pyrolysis of unreacted coal and asphaltene, the oxidation of molybdenum sulfide at 349–606/666 °C, the diffusion of MoO3 at 606/666–85 °C, and the sublimation reaction process of MoO3 at 854–1200 °C. The results show that the lower heating rate can promote the oxidation of the Mo compound and the sublimation of molybdenum trioxide. On the other hand, the oxides of aluminum, calcium, and iron in DCLR(ER) can inhibit the oxidative pyrolysis efficiency of the DCLR(ER)-MoS2 system.

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Section: Introductionmentioning

confidence: 99%