Removal of Water from Water-in-crude Oil Emulsions with Poly[(acrylic acid)-<i>co</i>-(sodium acrylate)] as Water-absorptive-polymers

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  • Nakano Chiyu
    Dept. of Geosciences, Geotechnology, and Materials Engineering for Resources, Graduate School of Engineering and Resource Science, Akita University
  • Takada Yuta
    Dept. of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • Chida Yutaro
    Dept. of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • Kato Sumio
    Dept. of Materials Science, Graduate School of Engineering Science, Akita University
  • Ogasawara Masataka
    Dept. of Materials Science, Graduate School of Engineering Science, Akita University
  • Ikeuchi Takao
    Dept. of Materials Science, Graduate School of Engineering Science, Akita University
  • Shindo Takayoshi
    Dept. of Materials Science, Graduate School of Engineering Science, Akita University

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Other Title
  • 吸水性ポリマーを用いた原油中水型（W/O）エマルジョンからの水分離
  • キュウスイセイ ポリマー オ モチイタ ゲンユ チュウスイガタ(W/O)エマルジョン カラ ノ ミズ ブンリ

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Abstract

<p>Removal of water from water-in-crude oil (W/O) emulsions was investigated using poly[(acrylic acid)-co-(sodium acrylate)］as water-absorptive-polymer (WAP) at 15-70 °C and under 0.1-1.5 MPa employing a batch or a flow separation system. The W/O emulsions with water content of 1-5 mass% were prepared from Upper Zakum (UZ) crude oil reserved at a domestic oil stockpiling base and distilled water. In each separation system, water absorption rates of both granular and fibrous WAPs from W/O emulsions under ambient conditions were much faster than that of zeolite 4A, indicating an effectiveness of WAPs for water separation. Removal of water from W/O emulsions was enhanced at high temperatures (50-70 °C) and under high pressures (1.0-1.5 MPa). It was found that regeneration of used WAPs was possible by rinsing them in toluene followed by drying. These results indicate that absorption of water from W/O emulsion using WAP is considered as one of the promising physical demulsification methods such as centrifugal separation, thermal treatment, and gravitational sedimentation without using chemical demulsifier.</p>

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