用功能性聚合物抑制缩:离子强度,双价离子和温度的作用
Masashi Kaneda1, Tianchi Cao2, Dengpan Dong3
1Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520-8286, USA.
Water research
|May 22, 2024
概括
功能性聚合物有效地抑制了工业废水中的二氧化缩. 然而,高离子强度和双价离子降低了效率,而高温提高了性能,为各种应用提供了解决方案.
科学领域:
- 材料科学与工程 材料科学与工程
- 环境化学环境化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 性工业废水中的垢形成对工程系统构成重大挑战.
- 功能性聚合物通常用作缩抑制剂,但它们的有效性受到可变料水成分的挑战.
- 了解溶液参数对抑制剂性能的影响,对于有效的化物度减轻至关重要.
研究的目的:
- 系统地研究离子组成 (离子强度,双价离子) 和温度对缩抑制的作用.
- 为了评估分子设计的氨基/胺基聚合物的性能作为二氧化尺度抑制剂.
- 在不同的溶液条件下阐明底层缩抑制的机制.
主要方法:
- 使用分子设计的氨基/胺基聚合物对缩抑制的系统研究.
- 测试各种离子强度 (NaCl度) 的抑制剂性能,以及在双价离子存在的情况下.
- 使用分子动力学模拟来理解抑制剂-相互作用和竞争性结合机制.
- 在高温下评估抑制剂的有效性.
主要成果:
- 聚合物抑制剂在低离子强度下显示了74%的效率,在20,000 ppmNaCl中显示了55%的效率.
- 在180,000 ppm NaCl下,抑制效率显著下降,这表明在非常高的离子强度下存在限制.
- 比起离子,二价离子对抑制产生了更明显的负面影响.
- 分子动力学模拟揭示了离子和酸在聚合物结合点之间存在竞争,以及阴离子-酸聚类.
- 对于500 ppm的酸溶液,在高温下实现了近乎完美的抑制.
结论:
- 氨基/胺基聚合物显示出度抑制的前景,但性能对离子强度和组成敏感.
- 竞争和阴离子诱导的聚合是限制复杂盐中抑制剂有效性的关键机制.
- 高温显著提高了这些聚合物的有效性,表明了高温应用的潜力.
- 这项研究为设计和应用不同工业环境中的尺度抑制剂提供了关键的见解.
相关概念视频
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01:17Ion Exchange
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