The Experts below are selected from a list of 174 Experts worldwide ranked by ideXlab platform
Xiumin Jiang - One of the best experts on this subject based on the ideXlab platform.
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characterization of dachengzi oil shale fast pyrolysis by Curie Point pyrolysis gc ms
2015Co-Authors: Yiru Huang, Xiangxin Han, Xiumin JiangAbstract:Fast pyrolysis of a Dachengzi oil shale sample was studied using a Curie-Point pyrolyzer, the pyrolysis products were characterized online by gas chromatography-mass spectroscopy. Nine different Curie-Point tempera- tures were chosen to investigate product distribution regularities. Hydro- carbons were the major components of the fast pyrolysis products of oil shale. n-Alkanes were generated at all the nine temperatures, while cyclo- alkanes only appeared at the temperatures above 485 °C. Branched alkanes were seldom produced at all the temperature Points because of the bond cleavage at the branch Point. Alkenes and aromatic compounds began to be formed at 386 °C and 423 °C separately, and their molecule sizes decreased with increasing pyrolysis temperature. Various oxygen-containing com- pounds, including ketones, acids, alcohols, esters and phenols, were identified in the shale oil components, indicating the wide existence of oxygen-containing functional groups.
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fast pyrolysis comparison of coal water slurry with its parent coal in Curie Point pyrolyser
Energy Conversion and Management, 2009Co-Authors: Hui Wang, Xiumin Jiang, Shaohua WuAbstract:Abstract Curie-Point pyrolyser is an instrument that can be used to analyze powder or slurry samples at medium heating rates. It can keep a constant heating rate to heat up the samples until the wire temperature reaches Curie-Point temperature and remains the same temperature. In this paper, coal–water slurry (CWS) and its parent coal were studied by using a Curie-Point pyrolyser. Kinetic parameters of pyrolysis were calculated and apparent activation energy of CWS obtained is 16.362 kJ/mol, which is a little higher than that of its parent coal, 12.691 kJ/mol. The experimental curves show lean S shape and the heating rate are obtained, which are 617 K/s and 834 K/s, respectively.
Kazuo Nakamura - One of the best experts on this subject based on the ideXlab platform.
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Studies on Curie-Point Pyrolysis of Coal Model Compounds
Energy & Fuels, 1995Co-Authors: Satoru Murata, Toyokazu Mori, Akira Murakami, Masakatsu Nomura, Kazuo NakamuraAbstract:Curie-Point pyrolysis/GC and /GC/MS analyses were carried out for 14 coal model aromatic compounds with longer alkyl side chains or polymethylene bridges. It was found that (i) pyrolytic products reflected quantitatively constituents of original model compounds (though thermal decomposition in these systems is complicated with several secondary reactions), (ii) a series of 1-alkenes was obtained as major aliphatic products from the pyrolysis of the model compounds having longer alkyl side chain, while Curie-Point pyrolysis of some coals or their extracts afforded a series of n-alkanes as major products along with senor amounts of 1-alkenes, and (iii) model compounds such as more condensed aromatic compounds or the aromatic compounds having oxygen functional groups afforded n-alkanes preferentially along with 1-alkenes. On the basis of the results obtained in this paper, we tried to correlate Curie-Point pyrolytic products of extracts from Illinois No. 6 coal with its supposed organic chemical structure
Jiang Jianchun - One of the best experts on this subject based on the ideXlab platform.
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Study on Curie-Point Pyrolysis of Xylan under CP-GC-MS Conditions
Chemistry and Industry of Forest Products, 2010Co-Authors: Liu Junli, Jiang Jianchun, Huang HaitaoAbstract:The influence of temperature on the relative content of pyrolysis products obtained by Curie-Point pyrolysis of xylan,which was considered as the model compound of hemicelluloses,was investigated by Curie-Point pyrolysis-gas chromatography-mass spectroscopy(CP-GC-MS),and pyrolysis behavior of xylan was contrasted with cellulose.The results showed that the process of xylan Curie-Point pyrolysis could be divided into two regions.At the temperature of less than 300℃,xylan by random glycosidic cleavage of xylan was cleaved to form furfural and monosaccharides,where furfural content reached 54.38% in the pyrolysate.At the temperature of more than 300℃,the kind and content of chemicals of small molecular aldehyde and ketone were increased greatly with the enhancement of pyrolysis temperature.The difference of pyrolysis behaviors between xylan and cellulose was that pyrolysis temperature of xylan was lower than that of cellulose,and the main pyrolysis product from xylan was furfural,while that of cellulose was levoglucosan.
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Study on thermal transformations of lignin under Curie-Point pyrolysis-GC-MS conditions.
Chemistry and Industry of Forest Products, 2009Co-Authors: Liu Junli, Jiang Jianchun, Huang HaitaoAbstract:The influence of temperature on the relative content of pyrolysis products obtained by Curie-Point pyrolysis from alkali-lignin,which was considered as the model compound of lignin,was investigated by Curie-Point pyrolysis-gas chromatography-mass spectroscopy(CP-GC-MS).The results showed that phenolic compounds up to GC content 60 % were prepared by the Curie-Point pyrolysis of lignin.The process of Curie-Point lignin pyrolysis could be divided into three areas.In the area of less than 300 ℃,lignin was pyrolyzed into phenolic compounds mostly made up of guaiacol-unit.In the area between 300 ℃ and 360 ℃,GC content of phenolic compounds were improved greatly with the enhancement of pyrolysis temperature.Guaiacol-unit compounds reached to 90 % of phenolic compounds.In the area of more than 360 ℃,the GC content of phenolic compounds kept to about 60 %,while the GC content of guaiacol-unit compounds was reduced with the increase of pyrolysis temperature,because guaiacol-unit was broken to form other phenolic compounds and small molecular substances,such as methyl alcohol.
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Study on Curie-Point Pyrolysis of Bamboo
Chemistry and Industry of Forest Products, 2007Co-Authors: Jiang JianchunAbstract:Bamboo is pyrolyzed at 358,445,590 and 670 ℃ in JHP-5 model Curie-Point pyrolysis.The results of GC-MS on-line analysis show that the main liquid products are furfural and aromatic substances.The relative content of 2,3-dihydrobenzofuran comes up to 21 % at 445 ℃,and the relative contents of main liquid products climb up then decline as the pyrolysis temperature increasing.The temperature between 445 ℃ to 590 ℃ is fit for liquid products in this experimental condition.Pyrolysis mechanism indicates that furfural and aromatic substances are formed from the pyrolysis of cellulose,hemicellulose and lignin,respectively.
Huang Haitao - One of the best experts on this subject based on the ideXlab platform.
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Study on Curie-Point Pyrolysis of Xylan under CP-GC-MS Conditions
Chemistry and Industry of Forest Products, 2010Co-Authors: Liu Junli, Jiang Jianchun, Huang HaitaoAbstract:The influence of temperature on the relative content of pyrolysis products obtained by Curie-Point pyrolysis of xylan,which was considered as the model compound of hemicelluloses,was investigated by Curie-Point pyrolysis-gas chromatography-mass spectroscopy(CP-GC-MS),and pyrolysis behavior of xylan was contrasted with cellulose.The results showed that the process of xylan Curie-Point pyrolysis could be divided into two regions.At the temperature of less than 300℃,xylan by random glycosidic cleavage of xylan was cleaved to form furfural and monosaccharides,where furfural content reached 54.38% in the pyrolysate.At the temperature of more than 300℃,the kind and content of chemicals of small molecular aldehyde and ketone were increased greatly with the enhancement of pyrolysis temperature.The difference of pyrolysis behaviors between xylan and cellulose was that pyrolysis temperature of xylan was lower than that of cellulose,and the main pyrolysis product from xylan was furfural,while that of cellulose was levoglucosan.
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Study on thermal transformations of lignin under Curie-Point pyrolysis-GC-MS conditions.
Chemistry and Industry of Forest Products, 2009Co-Authors: Liu Junli, Jiang Jianchun, Huang HaitaoAbstract:The influence of temperature on the relative content of pyrolysis products obtained by Curie-Point pyrolysis from alkali-lignin,which was considered as the model compound of lignin,was investigated by Curie-Point pyrolysis-gas chromatography-mass spectroscopy(CP-GC-MS).The results showed that phenolic compounds up to GC content 60 % were prepared by the Curie-Point pyrolysis of lignin.The process of Curie-Point lignin pyrolysis could be divided into three areas.In the area of less than 300 ℃,lignin was pyrolyzed into phenolic compounds mostly made up of guaiacol-unit.In the area between 300 ℃ and 360 ℃,GC content of phenolic compounds were improved greatly with the enhancement of pyrolysis temperature.Guaiacol-unit compounds reached to 90 % of phenolic compounds.In the area of more than 360 ℃,the GC content of phenolic compounds kept to about 60 %,while the GC content of guaiacol-unit compounds was reduced with the increase of pyrolysis temperature,because guaiacol-unit was broken to form other phenolic compounds and small molecular substances,such as methyl alcohol.
Shaohua Wu - One of the best experts on this subject based on the ideXlab platform.
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fast pyrolysis comparison of coal water slurry with its parent coal in Curie Point pyrolyser
Energy Conversion and Management, 2009Co-Authors: Hui Wang, Xiumin Jiang, Shaohua WuAbstract:Abstract Curie-Point pyrolyser is an instrument that can be used to analyze powder or slurry samples at medium heating rates. It can keep a constant heating rate to heat up the samples until the wire temperature reaches Curie-Point temperature and remains the same temperature. In this paper, coal–water slurry (CWS) and its parent coal were studied by using a Curie-Point pyrolyser. Kinetic parameters of pyrolysis were calculated and apparent activation energy of CWS obtained is 16.362 kJ/mol, which is a little higher than that of its parent coal, 12.691 kJ/mol. The experimental curves show lean S shape and the heating rate are obtained, which are 617 K/s and 834 K/s, respectively.
