Acid-Catalyzed Depolymerization of Coals of Different Rank under Mild Conditions with HF and Superacid HF/BF3
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- 作者：Kiyoyuki Shimizu ; Ikuo Saito ; Hiroyuki Kawashima ; and Shinsuke Sasaki
- 刊名：Energy & Fuels
- 出版年：1999
- 出版时间：January 1999
- 年：1999
- 卷：13
- 期：1
- 页码：197 - 203
- 全文大小：123K
- 年卷期：v.13,no.1(January 1999)
- ISSN：1520-5029
文摘
Hydrogen fluoride and a mixture of hydrogen fluoride/boron trifluoride were examined as acidcatalysts for solubilization of coals of different coal rank under mild reaction conditions. Hydrogenfluoride alone accelerated solubilization of the coals with toluene at 150 
C to some extent.Mixtures of hydrogen fluoride and boron trifluoride in the presence of toluene at 150 C for 3 hunder autogenous pressure were found to solubilize all coals nearly completely. Miike bituminouscoal readily produced highly soluble products in all reaction conditions, whereas the extent ofsolubilization of Yallourn lignite depended on reaction conditions such as temperature, stabilizer,and acidity of acid catalyst. Solubilization of Miike bituminous coal was mainly the result ofdepolymerization by cleavage of methylene bridges, while in Yallourn lignite, deoxygenation aswell as depolymerization was required for solubilization. Most of the remaining BF3 probablyformed complexes with the organic matter, but no fluoride compounds were detected in the solublefraction with the exception of BF3. Concentration of the main ash component, Si, in the originalcoal greatly decreased after the reaction, but a small proportion of another major ash component,Al, remained as AlF3.
C to some extent.Mixtures of hydrogen fluoride and boron trifluoride in the presence of toluene at 150 C for 3 hunder autogenous pressure were found to solubilize all coals nearly completely. Miike bituminouscoal readily produced highly soluble products in all reaction conditions, whereas the extent ofsolubilization of Yallourn lignite depended on reaction conditions such as temperature, stabilizer,and acidity of acid catalyst. Solubilization of Miike bituminous coal was mainly the result ofdepolymerization by cleavage of methylene bridges, while in Yallourn lignite, deoxygenation aswell as depolymerization was required for solubilization. Most of the remaining BF3 probablyformed complexes with the organic matter, but no fluoride compounds were detected in the solublefraction with the exception of BF3. Concentration of the main ash component, Si, in the originalcoal greatly decreased after the reaction, but a small proportion of another major ash component,Al, remained as AlF3.