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Controlling water dynamics for kinetic inhibition of clathrate hydrate

机译：控制水动力学的动力学抑制克拉酸水合物

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摘要

Subsea natural gas drilling and gas transport is challenged by the catastrophic formation of gas clathrate hydrate in production lines. Polymer inhibitors are vital to mitigate this technical problem in subsea gas drilling operation. However, physico- chemical factors affecting their performance are not yet completely known. Herein, we report that the activities of synthetic kinetic inhibitors of clathrate hydrates are correlated to the surrounding water dynamics. Two types of linear polyamide inhibitors are found to be capable of producing immobilized nonfreezable water molecules with fast transverse relaxation in sub-millisecond to millisecond time-scale as revealed by NMR relaxometry. Such a unique state of water can be construed as a form of nonfreezable bound water measured by differential scanning calorimetry. The quantity of such water species can be tuned by the size of the hydrophobic groups introduced to the polyamides and result in longer inhibition time before the rapid growth of the hydrate crystals. Addition of a single hydroxyl side group in the polymer structural unit can also affect the dependence of the kinetic inhibition time on the amount of the supercooled water. Both the hydrophobic and hydrophilic groups in the polymer inhibitors exert coordinated influence on the dynamic properties of the bound water, which are responsible for the early recognition and inhibition of the clathrate hydrate clusters.
机译：海底天然气钻井和天然气运输受到生产线中灾难形成水合物的灾难性形成挑战。聚合物抑制剂对海底气钻操作中的这种技术问题很重要。然而，影响其性能的物理化学因素尚未完全已知。在此，我们报告说，包裹水合物的合成动力学抑制剂的活性与周围的水动力学相关。发现两种类型的线性聚酰胺抑制剂能够产生固定化的非偏充水分子，其在亚毫秒中以快速横向弛豫，以毫秒为毫秒的时间尺度，如NMR弛豫测定法所示。这种独特的水状态可以被解释为通过差分扫描量热法测量的非难以放置的水的形式。这种水物质的量可以通过引入聚酰胺的疏水基团的尺寸来调节，并在水合物晶体的快速生长之前导致抑制时间更长。在聚合物结构单元中加入单个羟基侧基组也可以影响动力学抑制时间对过冷水量的依赖性。聚合物抑制剂中的疏水性和亲水基团均对结合水的动态性质发挥协调影响，这对克拉碱水合物簇的早期识别和抑制负责。

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  • 来源
    《Fuel》 |2020年第jul1期|117588.1-117588.10|共10页
  • 作者

    Li Dongfang; Ma Shang; Laroui Abdelatif; Zhang Yixian; Wang Jie; Lu Ping; Dong Jian;

  • 作者单位

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

    Shaoxing Univ Coll Chem & Chem Engn Shaoxing 312000 Zhejiang Peoples R China;

  • 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

    Kinetic hydrate inhibitors; Clathrate hydrate; Dynamics; NMR; Polymers;

    机译：动力学水合物抑制剂;Clathrate水合物;动态;NMR;聚合物;

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