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Investigation of asphaltene dispersion stability in slurry-phase hydrocracking reaction

机译：淤浆相热裂化反应中沥青质分散稳定性研究

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摘要

Asphaltene precipitation is known as a challenging issue to fully upgrade heavy oils. In this study, asphaltene dispersion stability and sediment formation for a slurry phase hydrocracking reaction of vacuum residue was investigated with changes of temperatures (405-435 degrees C), LHSV (0.20-0.45 hr(-1)), pressures (80-180 bar) and superficial gas velocities (0.4-2.2 cm/s) in a bench-scale continuous system. The characteristics of dispersion stability were examined with the solubility parameters at the flocculation point (UV titration), the structure of the asphaltenes (H-NMR), and sediment content in the liquid product (Hot filtration). As results, it was found that the dispersion stability of asphaltene was mainly dependent on the VR conversion. In particular, at about 50% of the VR transition, the solubility was found to be unstable and the amount of deposition increased dramatically. At the same time, microscopic observation directly confirmed asphaltene flocculation. However, when H-2 partial pressure was increased, the hydrogenation reaction of asphaltene was promoted so that it could reduce sediment formation and improve both the asphaltene solubility and structure for the stable dispersion. On the other hand, increasing the superficial gas velocity did not give an effect on the asphaltene dispersion stability.
机译：沥青质沉淀被称为充分升级重油的挑战性问题。在该研究中，研究了温度变化（405-435℃），LHSV（0.20-0.45（-1）），压力（80-180） BAR）和浅表气体速度（0.4-2.2cm / s）在板凳上连续系统。用絮凝点（UV滴定）的溶解度参数，液体产物（热过滤）中的沉积物（H-NMR）的结构进行分散稳定性的特征，并在液体产物（热过滤）中的沉积物含量。结果结果，发现沥青质的分散稳定性主要取决于VR转化。特别地，在大约50％的VR转变的情况下，发现溶解度是不稳定的，并且沉积量急剧增加。同时，显微镜观察直接确认沥青质絮凝。然而，当H-2分压增加时，促进了沥青质的氢化反应，使其可以减少沉积物形成，并改善沥青质溶解度和结构的稳定分散体。另一方面，增加浅表气体速度并未对沥青质分散稳定性产生影响。

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  • 来源
    《Fuel》 |2020年第jul1期|117509.1-117509.10|共10页
  • 作者

    Lim Suk Hyun; Go Kang Seok; Kwon Eun Hee; Nho Nam Sun; Lee Jae Goo;

  • 作者单位

    Korea Inst Energy Res Climate Change Res Div 152 Gajeong Ro Daejeon 34129 South Korea|Korea Res Inst Chem Technol Ctr Convergent Chem Proc 141 Gajeong Ro Daejeon 34114 South Korea|Univ Sci & Technol 217 Gajeong Ro Daejeon 34113 South Korea;

    Korea Inst Energy Res Climate Change Res Div 152 Gajeong Ro Daejeon 34129 South Korea|Korea Res Inst Chem Technol Ctr Convergent Chem Proc 141 Gajeong Ro Daejeon 34114 South Korea;

    Korea Inst Energy Res Climate Change Res Div 152 Gajeong Ro Daejeon 34129 South Korea;

    Korea Inst Energy Res Climate Change Res Div 152 Gajeong Ro Daejeon 34129 South Korea|Korea Res Inst Chem Technol Ctr Convergent Chem Proc 141 Gajeong Ro Daejeon 34114 South Korea;

    Korea Inst Energy Res Climate Change Res Div 152 Gajeong Ro Daejeon 34129 South Korea|Univ Sci & Technol 217 Gajeong Ro Daejeon 34113 South Korea|Korea Inst Energy Res FEP Convergence Res Ctr 152 Gajeong Ro Daejeon 34129 South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heavy oil; Slurry phase hydrocracking; Asphaltene; Dispersion stability; Sediment; Coke;

    机译：重油;浆液相加热;沥青质;分散稳定性;沉积物;可乐;

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