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Hydrothermal extractive upgrading of bitumen without coke formation

机译：沥青的水热萃取提纯，无积炭

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摘要

Upgrading bitumen by converting asphaltene to maltene whilst suppressing coke formation is desirable though technically difficult. Mass transfer behavior under sub- and super critical water conditions was observed in an autoclave-type reactor revealing that the dissolution of asphaltene core attenuates coke formation and promotes the formation of upgraded products. On the basis of this new information, a continuous hydrothermal extraction method using near supercritical water in a column flow reactor was tested. The results at 300℃, 3-6 MPa, and water flow of 3-10 g/min, showed higher degree of upgrading than in the autoclave reactor. Significant conversion of asphaltene to maltene with lighter maltene composition was obtained, while coke formation was completely suppressed. A continuous hydrothermal extraction method using a column flow reactor has thus been shown can solve the problem of incompatibility between enhancing the degree of upgrading of heavy oils and suppressing the formation of coke. In the proposed mechanism, low levels of asphaltene core extraction results in the formation of coke in the oil phase, whereas high levels of asphaltene core extraction results in the suppression of coke formation due to low concentrations of asphaltene core remaining in the oil phase, and the solvent properties that asphaltene core acquires at high concentrations in the water phase.
机译：尽管在技术上是困难的，但希望通过将沥青质转化为麦芽烯同时抑制焦炭的形成来升级沥青。在高压釜式反应器中观察到了在亚临界和超临界水条件下的传质行为，表明沥青质岩心的溶解减弱了焦炭的形成并促进了提质产物的形成。根据这一新信息，测试了在柱流反应器中使用近超临界水进行连续水热萃取的方法。在300℃，3-6 MPa和3-10 g / min的水流量下的结果表明，其升级程度高于高压釜反应器。用更轻的麦芽烯组成，沥青质明显转化为麦芽烯，同时完全抑制了焦炭的形成。因此显示出使用柱流反应器的连续水热萃取方法可以解决增加重油的提质程度和抑制焦炭形成之间的不相容问题。在提出的机理中，低含量的沥青质岩心提取会导致在油相中形成焦炭，而高含量的沥青质岩心提取会由于油相中残留的低浓度沥青质岩心而导致抑制焦炭形成，并且沥青质岩心在水相中以高浓度获得的溶剂特性。

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  • 来源
    《Fuel》 |2012年第2012期|p.379-385|共7页
  • 作者

    Javier Vilcaez; Masaru Watanabe; Noriaki Watanabe; Atsushi Kishita; Tadafumi Adschiri;

  • 作者单位

    New Industry Creation Hatchery Center (NICHe), Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan,Frontier Research Center for Energy and Resources, Graduate School of Engineering, The University of Tokyo, Hongo,Bunkyo-ku, Tokyo 113-8656, Japan;

    Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan;

    Graduate School of Environmental Studies, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan;

    Graduate School of Environmental Studies, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;

  • 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

    bitumen; extractive upgrading; column flow reactor; sub-supercritical water;

    机译：沥青;采掘升级;柱流反应器亚超临界水;

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