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Comparative pyrolysis kinetics of heavy oil and its SARA fractions using distributed activation energy model

Petroleum Science 2023年第5期20卷 3231-3239页

作者： Qing-An Xiong Yu-Ming Zhang Pei Qiao Guo-Tong Li Jia-Zhou Li Wei Zhang College of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China

The pyrolysis behaviors of Qingdao vacuum residue(QD-VR)and its SARA(saturates,aromatics,reins,and asphaltenes)fractions were evaluated by thermo-gravimetric with mass spectrometer(TG-MS).The pyrolysis kinetics were determined by Friedman,one-parallel and four-parallel distributed activation energy model(DAEM),*** results indicated that the pyrolysis behavior of QD-VR was similar to that of *** saturates,the release of H_(2),CH_(4),CO,and CO_(2) occurred in 80-400℃,while the temperature range for QD-VR and other fractions is 200-800℃.The average activation energy(Ea)via Friedman method was 179.72 kJ/mol and increased with the conversion ***-parallel Gaussian DAEM was more suitable to describe the pyrolysis process of the single SARA fractions,while four-parallel Gaussian DAEM was more suitable to describe the pyrolysis process of heavy ***,comparing the weighted E_(a) from one-parallel(227.64 kJ/mol)and four-parallel Gaussian DAEM(204.63 kJ/mol),the results suggested that during pyrolysis process of heavy oil,there was an interaction between the SARA fractions,which could reduce the E_(a) of heavy oil ***,during heavy oil pyrolysis,resins and asphaltenes could increase the E_(a) of saturates and aromatics,while saturates and aromatics could decrease the E_(a) of resins and asphaltenes.

关键词： Heavy oil pyrolysis kinetics SARA fractions DAEM

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A Sustainable Strategy for Spent Cathode Carbon Blocks Hazardous Waste Recycling Using Binary Molten Salt Thermal Treatment

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Journal of Thermal Science 2024年第3期33卷 1082-1093页

作者： LI Bin DING Yan JIAO Yuyong XU Fang WANG Xinyang ZHENG Fei ZOU Junpeng GAO Qiang HU Hongyun Faculty of Engineering China University of GeosciencesWuhan430074China Institute for Natural Disaster Risk Prevention and Emergency Management China University of GeosciencesWuhan430074China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan430074China

Waste-to-Energy treatment is a promising path to environment and energy management in the *** work detailed a binary molten salt thermal treatment methodology for the detoxification of spent cathode carbon block(SCCB)waste and the recycling of carbonaceous *** thermal behavior of SCCB and SCCB blended with molten salts was *** was found that the NaCl-Na_(2)CO_(3)binary molten salts significantly contributed to reducing pyrolysis onset temperature by 334.3 K compared to that of SCCB itself(i.e.,activation energy of pyrolysis reaction was reduced from 4.24×10^(5)to 2.30×10^(5)J/mol),thus helping to lower thermal treatment energy *** the addition of binary molten salts,the residue after thermal treatment in a horizontal tube furnace experiment was separated into two *** bottom-layer residue was mainly composed of molten *** fluorine content in the form of NaF and CaF_(2)of top-layer residue was reduced significantly while the carbon content remained ***,the leaching concentration of fluoride ion was decreased from 4620 mg/L to 856 mg/*** is noted that the NaF and CaF_(2)can be removed through water-leaching and hydrothermal acid-leaching methods and thus the carbonaceous materials with a calorific value of 17.5 MJ/kg were obtained.

关键词： spent cathode carbon block hazardous solid waste detoxification binary-molten-salt thermal treatment carbon recycling pyrolysis kinetics

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Simple preparation of C(CS)/g-C_(3)N_(4)/Co carbon aerogel and its catalytic performance for ammonium perchlorate

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Defence Technology（防务技术） 2024年第3期33卷 186-196页

作者： Yujie Yan Bo Jin Rufang Peng State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

Biomass chitosan(CS)was used as a template,graphitic phase carbon nitride(g-C_(3)N_(4))with high nitrogen content and certain catalytic activity was used as a dopant,and nano-transition metal cobalt(Co)was used as a catalytic center *** carbon aerogel(C(CS)/g-C_(3)N_(4)/Co)with a three-dimensional network-like structure was prepared by assembling the three materials through experimental operations such as freeze-drying and high-temperature *** was demonstrated by scanning and transmission characterization that the CS in the carbon aerogel could provide more active sites for the cobalt nanoparticles,and the doping of graphite-phase carbon nitride as a template dispersed the cobalt nanoparticles and changed the conductivity of the *** investigate the catalytic effect of carbon aerogel on ammonium perchlorate(AP),it was investigated by differential thermal analyzer and TG thermal *** carbon aerogel was very effective in catalyzing AP,and the 10 wt% content of the catalyst reduced the AP pyrolysis peak from 703.9 to 595.5 *** to further investigate the synergistic effect of the three materials,further carbon aerogels such as C(CS)/Co,g-C_(3)N_(4)/Co were prepared and applied to catalyze AP,and the same ratio reduced the AP pyrolysis peak by 98.1℃ and 97.7℃.This result indicates a synergistic effect of the assembly of the three materials.

关键词： g-C_(3)N_(4) Chitosan Co Ammonium perchlorate pyrolysis kinetics

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Effect of demineralization on pyrolysis characteristics of LPS coal based on its chemical structure

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International Journal of Coal Science & Technology 2023年第2期10卷 181-195页

作者： Lin Qian Jinkai Xue Chao Tao Chao Ma Xiaopeng Jiang Feiqiang Guo School of Low-Carbon Energy and Power Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Clean Energy Utilization Zhejiang University310027 HangzhouChina

The critical issue in developing mature Oxy-Coal Combustion Steam System technology could be the reactivity of deminer-alized coal which,is closely related to its chemical *** chemical structures of Liupanshui raw coal(LPS-R)and Liupanshui demineralized coal(LPS-D)were analyzed by FTIR and solid-state *** pyrolysis experiments were carried out by TG,and the pyrolysis kinetics was analyzed by three iso-conversional *** and 13C-NMR results suggested that the carbon structure of LPS coal was not altered greatly,while demineralization promoted the maturity of coal and the condensation degree of the aromatic ring,making the chemical structure of coal more *** oxygen-containing functional groups with low bond energy were reduced,and the ratio of aromatic carbon with high bond energy was increased,decreasing the pyrolysis *** curve-fitting results revealed that the thermal weight loss of LPS coal mainly came from the cleavage of aliphatic covalent *** pyrolysis kinetics analysis of LPS-R and LPS-D,the apparent activation energies were 76±4 to 463±5 kJ/mol and 84±2 to 758±12 kJ/mol,respectively,under different conversion *** reactivity of the demineralized coal was inhibited to some extent,as the apparent activation energy of pyrolysis for LPS-D increased by acid treatment.

关键词： Demineralization Chemical structure of coal Coal pyrolysis pyrolysis kinetics Iso-conversional

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The dynamic changes and mechanisms of Rehmanniae radix processing based on Maillard reaction

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Traditional Medicine Research 2021年第1期6卷 63-73页

作者： Xiang-Long Meng Bo Wang Xiao-Yan Zhang Chen-Zi Lyu Xiao-Juan Su Chen-Xu Ning Shuo-Sheng Zhang College of Chinese Materia Medica Shanxi University of Chinese MedicineJinzhong 030619ShanxiChina Department of Herbology College of Korean MedicineDongguk UniversityGyeongju 38066Korea

Background:Traditional Chinese medicines are usually processed before they are used for clinical *** is done in a way associated with the Maillard ***:Based on the Maillard reaction,this paper analyzed the degree of processing of rehmannia root(Rehmanniae radix)relative to the dynamic variation rules of Maillard reaction index parameters,including pH,A420,amino acids,and ***,this study introduced thermal analysis techniques and pyrolysis kinetics to assess the influence of the correlation between processing raw rehmannia root and the Maillard reaction during *** then went through the whole process of transforming the raw material to end-product in order to explain the scientific connotation of processing ***:The results showed that each time rehmannia root was processed,its pH value and amino acid content decreased,while the A420 value and 5-HMF *** with wine shows a significant difference in these experimental *** position and intensity of the maximum thermal weight loss rate peak of processed rehmannia root at different degrees of processing are *** quantitative 221±0.2°C for processed rehmannia root carbonization was the processing temperature ***,the kinetic solution verified that the activation energy corresponding to the carbonization temperature was close to the maximum value of the activation energy of the whole carbonization process,and the optimal mechanism function was g(α)=((1−α)−1/3−1)***:The Maillard reaction occurred during the processing of rehmannia root mixed with *** each increase of the number of steaming and drying cycles involved in the processing,the level of Maillard reaction increased *** wine-steaming method had a significant effect on the quality of the processed product.

关键词： Processing of traditional Chinese medicine Maillard reaction Radix Rehmanniae Praeparata Rehmannia root Thermoanalysis pyrolysis kinetics

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