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首页> 外文期刊>ACS applied materials & interfaces >Dewatering Oil Sands Tailings with Degradable Polymer Flocculants
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Dewatering Oil Sands Tailings with Degradable Polymer Flocculants

机译：具有可降解聚合物絮凝剂的脱水油砂尾矿

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摘要

We synthesized hydrolytically degradable cationic polymers by micellar radical polymerization of a short-chain polyester macromonomer, polycaprolactone choline iodide ester methacrylate (PCL(2)ChMA) with two polyester units, and used them to flocculate oil sands mature fine tailings (MFT). We evaluated the flocculation performance of the homopolymer and copolymers with 30 mol % acrylamide (AM) by measuring initial settling rate (ISR), supernatant turbidity, and capillary suction time (CST) of the sediments. Flocculants made with trimethylaminoethyl methacrylate chloride (TMAEMC), the monomer corresponding to PCL(n)ChMA with n = 0, have improved performance over poly(PCL(2)ChMA) at equivalent loadings due to their higher charge density per gram of polymer. However, MFT sediments flocculated using the PCL(2)ChMA-based polymers are easier to dewater (up to an 85% reduction in CST) after accelerated hydrolytic degradation of the polyester side chains. This study demonstrates the potential of designing cationic polymers that effectively flocculate oil sands tailings ponds, and also further dewater the resulting solids through polymer degradation.
机译：通过短链聚酯大分子单体的胶束自由基聚合，通过短链聚酯大分子单体，聚己内酯胆碱碘化酯甲基丙烯酸酯（PCL（2）Chma）合成水解可降解的阳离子聚合物，并用两种聚酯单元使用它们来絮凝油砂成熟细尾（MFT）。通过测量初始沉降速率（ISR），上清浊度和沉积物的毛细管吸入时间（CST），评估均聚物和共聚物的均聚物和共聚物的絮凝性能。用甲基丙烯酸三甲基丙烯酸甲基丙烯酸甲酯（TMAEMC）制备的絮凝剂，对应于PCL（N）CHMA的单体，其具有n = 0，其具有在当量载荷的等同载荷上具有改善的性能，这是每克聚合物的较高电荷密度。然而，在加速水解侧链的水解降解后，使用PCL（2）基于PCL（2）基氏菌族聚合物絮凝的MFT沉积物更容易脱水（CST达85％）。本研究表明，设计有效地絮凝油砂尾气池的阳离子聚合物的潜力，并且还通过聚合物降解进一步脱水所得到的固体。

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