稠油火驱生成石油焦的化学结构表征*
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中国石油勘探与生产公司项目“新疆稠油火驱过程中成焦物理化学机理研究”(项目编号KS2020-01-05)


Chemical Structure Characterization of Petroleum Coke Produced by Heavy Oil Thermal Recovery
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    摘要:

    开展石油焦的化学结构表征对稠油火驱燃料生成机理研究具有重要意义。以新疆环烷基稠油为原料,在 气体组成为5% O2、79% N2、16% CO2,气体流速为50~100 mL/min,温度500 ℃的条件下反应40 min制备石油 焦,用多种检测方法对石油焦经溶剂萃取洗涤后的固体颗粒进行结构表征。结果表明,石油焦的制焦率为 23.4%,在氧含量为 21%的条件下于 440~600 ℃的燃烧量为 87.98%,燃烧放热量为 8662 J/g,着火温度为 490 ℃。经红外光谱、X射线光电子能谱、拉曼光谱、固体核磁等技术表征分析,石油焦结构是以芳香共轭多环为 核心体,外围有环烷环和含氮氧杂环环绕,并连接少量的烷烃支链、醚链与酯烃支链的类石墨分子片层结构,碳 骨架上的氧是以酮羰基及脂肪烃芳香醚的非活性氧形式存在。分子片层结构单元间通过范德华力、电荷转移、 π-π相互作用、氢键、偶极等分子间相互作用结合为5层堆叠缔合体,并叠加形成似晶碳颗粒。图9表1参12

    Abstract:

    The chemical structure characterization of petroleum coke is of great significance to the study of fuel generation mechanism of heavy oil fire flooding. The petroleum coke was prepared by using Xinjiang naphthenic heavy oil as raw material under the condition of gas composition of 5% O2,79% N2 and 16% CO2,50—100 mL/min gas flow rate,40 min reaction time and 500 ℃. The solid particles of petroleum coke washed by solvent extraction were subjected to the structure characterization by various detection methods. The results showed that the yield of petroleum coke was 23.4% . After petroleum coke burned under aerobic condition(21% oxygen content)at 440—600 ℃,the total weight of 87.98% was lost,and 8662 J of heat per gram of carbon material was produced. The ignition temperature was 490 ℃. Petroleum coke was characterized and analyzed by infrared spectroscopy,X-ray photoelectron spectroscopy,Raman spectroscopy and X-powder diffraction. It inferred that the structure of petroleum coke was graphite-like molecular lamellar structure with aromatic ring as core body,which surrounded by the ring of naphthene and heterocycles containing nitrogen and oxygen,and linked a small amount of alkane branch chains,ether and ester hydrocarbon branch chains. The oxygen on carbon skeleton was non-reactive oxygen in the form of ketone carbonyl group and aliphatic hydrocarbon aromatic ether. The molecular sheets were combined into 5 layers of stacked associations by intermolecular interaction,such as Vander Waals force,charge transfer,π-π interaction,hydrogen bonding and dipole,and superimposed crystal-like carbon particles.

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潘竟军,廖广志,王正茂,王旭生,卢晓锋,王立成,郭 勇.稠油火驱生成石油焦的化学结构表征*[J].油田化学,2021,38(3):470-475.
PAN Jingjun, LIAO Guangzhi, WANG Zhengmao, WANG Xusheng, LU Xiaofeng, WANG Licheng, GUO Yong. Chemical Structure Characterization of Petroleum Coke Produced by Heavy Oil Thermal Recovery[J]. OILFIELD CHEMISTRY,2021,38(3):470-475.

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  • 在线发布日期: 2021-11-12
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