長期備蓄原油中における油中水型(W/O)エマルジョンの安定化因子の検討  [in Japanese] Factors Influencing on Stability of Water-in-crude Oil (W/O) Emulsions  [in Japanese]

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Author(s)

    • 中野 知佑 Nakano Chiyu
    • 秋田大学大学院工学資源学研究科資源学専攻 Dept. of Geosciences, Geotechnology, and Materials Engineering for Resources, Graduate School of Engineering and Resource Science, Akita University
    • 池内 孝夫 Ikeuchi Takao
    • 秋田大学大学院理工学研究科物質科学専攻 Dept. of Materials Science, Graduate School of Engineering Science, Akita University
    • 進藤 隆世志 Shindo Takayoshi
    • 秋田大学大学院理工学研究科物質科学専攻 Dept. of Materials Science, Graduate School of Engineering Science, Akita University

Abstract

<p>原油備蓄基地において,タンク内で形成した原油系W/Oエマルジョンの水分離性(原油系W/Oエマルジョンの安定性)が,原油種によって著しく異なる要因を明らかにするため,水分離性が異なる原油(アッパーザクム,フート)を用いて原油系W/Oエマルジョンを調製し,水(水粒子)を重力沈降させてタンク内における水の沈降メカニズムを検討した。また,原油から分離した3留分(アスファルテン(ASP),脱れき油(レジン(R)を含有),ワックス状油(脱れき油からRを除いたもの))を用いてモデルW/Oエマルジョンを調製し,その安定性を評価して原油系W/Oエマルジョンの安定化に寄与する因子と,原油種により水の分離性に差異が現れる要因を検討した。その結果,一部の水粒子は沈降中に合一して大きくなり,また水が分離しやすい原油は,水が分離しにくい原油と比較して水粒子同士が合一しやすい環境を与える原油であることが示唆された。原油に含まれるASPおよびRは界面活性成分であり,ASPが形成する油水界面膜の堅ろう性およびRが油水界面膜強度や水粒子径に与える影響が原油系W/Oエマルジョンの安定性に寄与していることが示唆された。</p>

<p>Water-in-crude oil (W/O) emulsions were prepared from two crude oils, Upper Zakum (UZ) and Hout (HT), of which density and API degree were similar. The W/O emulsions were subjected to natural settling test to determine the mass% water resolved and settling model of water particles in W/O emulsions was proposed. Three fractions obtained from the crude oils, asphaltene (APS), <i>i.e.</i>, pentane insoluble fraction, deasphalting oil, <i>i.e.</i>, pentane soluble fraction containing resin (R), and waxlike oil, <i>i.e.</i>, pentane soluble fraction not containing resin, were mixed with liquid paraffin–toluene or toluene to prepare model W/O emulsions. These model emulsions were centrifuged to elucidate factors influencing on the mass% water resolved and the stability of model W/O emulsions. The results of natural settling test showed that the mass% water removed and increase in water particle size in W/O emulsion of HT were higher than those of UZ, suggesting higher stability of W/O emulsion of UZ compared with HT, with respect to coalescence of water particles in W/O emulsions. The results of centrifugation of model W/O emulsions indicated that ASP and R in UZ crude oil and ASP in HT crude oil may act as stabilizers of model W/O emulsions, and suggested capability of ASP and/or R for the stabilization of W/O emulsions through enhancement of oil-water interfacial film strength.</p>

Journal

  • Journal of the Japan Petroleum Institute

    Journal of the Japan Petroleum Institute 60(5), 211-222, 2017

    The Japan Petroleum Institute

Codes

  • NII Article ID (NAID)
    130006039455
  • NII NACSIS-CAT ID (NCID)
    AA11590615
  • Text Lang
    JPN
  • ISSN
    1346-8804
  • NDL Article ID
    028546151
  • NDL Call No.
    Z17-177
  • Data Source
    NDL  J-STAGE 
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