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《JOURNAL OF FUEL CHEMISTRY AND TECHNOLOGY》 1998-05
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FORMATION MECHANISMS OF SECOND LIQUID PHASES IN THERMAL REACTION SYSTEMS OF VACUUM RESIDUA

Li Shenghua (Tsinghua University Beijing) Liu Chenguang Que Guohe Liang Wenjie Zhu Yajie (University of Petroleum Dongying)  
In the thermal reaction systems of vacuum residua, some sparsely scattered planar and irregular entities and spheroids as well as aggregated irregular bodies densely distributed in the bulk phase of the sample come in sequence into the optical microscopic view in the sampled reacting vacuum residue with the elapse of the heat treatment time Previously these three categories of neophases were temporarily named as the physical, chemiphysical and chemical second liquid phase based on the limited preliminary analyses of their solubility class, compositions and structures In the present study, electronic transmission microscope observations of the physical structures of Shengli vacuum residue and chemical characterization of the nheptane insolubles and toluene solubles at onset points of the second liquid phases were examined and discussed, and accordingly, schematic routes which might account for both the inception of the second liquid phases and their growth into different morphologies were formulated At the onset point of the physical second liquid phase, the protoasphaltenes, which is from the partial or complete breakdown of the mixed asphaltenesheav ier resins micella due to thermomotions of molecules, dilution and agitation in the thermal reaction systems of vacuum residue, goes first through the kinetic growth and then through the thermodynamic growth to form, respectively, the fractal and the regularly shaped phase separation entities At the onset point of the chemiphysical second liquid phase, no any mixed micelle of asphaltenes or heavy resins coherent of the physical structure of the original vacuum residua is found Molecules of the protoasphlatenes unprotected by the heavy resins undergo the breakage fo intramolecular bridge bonds and the scissoring of the aliphatic sidechains, resulting in the formation of polycyclic aromatics with plane configurations With appropriate system fluidity, the embyroic polyaromatics molecules aggregate orderly, driven by the principle of minimum energy, into the spheroid chemical second liquid phase At the onset point of the chemical second liquid phase, the mixed micelle of asphaltenes and heavy resins in the original vacuum residua can not be seen anywhere in terms of the physical structure of reacting vacuum residua The radical propagation of the protoasphaltenes and in particular the resins accelerates automatically after the induction period, and neoasphaltenes are generated in a great quantity within a very short period These neoasphaltenes go via kinetic growth forming the irregular chemical second liquid phase
【Fund】: 国家自然科学基金
【CateGory Index】: TE626.25
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1 Wu Yan;Research Institute of Coal Chemistry,China Coal Research Institute;;Effect of Composition and Properties of SARA on Asphalt Flocculation Phenomenon in Coal Tar[J];石油化工高等学校学报;2018-02
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3 HONG Kun;MA Fengyun;LIU Jingmei;ZHONG Mei;Key Laboratory of Coal Clean Conversion & Chemical Engineering Process,College of Chemistry and Chemical Engineering,Xinjiang University;;Influence of Reaction Temperature on the Hydrothermal Cracking of Deasphalted Oil[J];石油学报(石油加工);2016-05
4 Zhao Yuansheng;Zhao Yusheng;Zhang Longli;Chen Pengwei;Zhao Ruiyu;Yang Chaohe;Petrochina Petrochemical Research Institute;China University of Petroleum (East China);;Relationship between colloidal stability variation and fractional properties of Middle East residue samples during fix-bed hydrotreating[J];石油化工;2016-09
5 TONG Peipei;WANG Zijun;Research Institute of Petroleum Processing,SINOPEC;;Causes,types and influencing factors of coke formation in petroleum processing[J];化工进展;2016-S1
6 Yang Yue;Shen Jian;Cheng Lihua;Chen Siqing;Liaoning Shihua University;Guangdong University of Petrochemical Technology;;EFFECT OF BLENDING FCC SLURRY ON PROPERTIES OF VACUUM RESIDUE[J];石油炼制与化工;2016-06
7 Hong Kun;Ma Fengyun;Zhong Mei;Liu Jingmei;Key Laboratory of Coal Clean Conversion & Chemical Engineering Process(Xinjiang Uyghur Autonomous Region),College of Chemistry and Chemical Engineering,Xinjiang University;;STUDY OF THERMAL CONVERSION OF TAHE ATMOSPHERIC RESIDUE AND ITS DEASPHALTED OIL IN PRESENCE OF HYDROGEN[J];石油炼制与化工;2016-06
8 HONG Kun;MA Feng-yun;ZHONG Mei;LIU Jing-mei;MO Wen-long;Key Laboratory of Coal Clean Conversion & Chemical Engineering Process ( Xinjiang Uyghur Autonomous Region) ,College of Chemistry and Chemical Engineering,Xinjiang University;;Analysis of asphaltene structure and its effects on the coking behavior in the process of hydrothermal cracking[J];燃料化学学报;2016-03
9 Hong Kun;Ma Fengyun;Zhong Mei;Chen Hanmei;Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region),College of Chemistry and Chemical Engineering,Xinjiang University;;STUDY OF THERMAL CRACKING IN HYDROGEN OF RESIDUE WITH DIFFERENT ASPHALTENE CONTENT[J];石油炼制与化工;2016-03
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2 Hong Kun;Ma Fengyun;Zhong Mei;Chen Hanmei;Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region),College of Chemistry and Chemical Engineering,Xinjiang University;;STUDY OF THERMAL CRACKING IN HYDROGEN OF RESIDUE WITH DIFFERENT ASPHALTENE CONTENT[J];石油炼制与化工;2016-03
3 ZHONG Yingzhu;JIN Aimin;Research Institute of Petroleum Processing,SINOPEC;;Present Situation and Progresses of Residue Processing Technology[J];石油学报(石油加工);2015-02
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