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膜蒸中的缩放行为:生物聚合物和抗缩剂的影响
1Department of Chemical Engineering, 807 Canton Ave., Texas Tech University, Lubbock, TX 79409, USA.
Water research
|March 28, 2024
概括
这项研究引入了一种新的实时成像方法来观察膜缩放. 它揭示了有机物和抗剂如何影响晶体形成,这对于改善膜蒸性能至关重要.
科学领域:
- 膜科学与技术 膜科学与技术
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 膜污染和缩降低了膜分离过程中的效率.
- 目前研究缩放的现有方法往往是间接的或现场的,限制了详细的机制理解.
- 在膜蒸 (MD) 中研究缩放具有挑战性,需要区分散装和异质核化.
研究的目的:
- 建立一种非侵入性,现场,实时成像装置,用于研究膜缩放机制.
- 在过试验中调查缩放的不同阶段.
- 分析有机物和抗缩剂对真空中缩的影响.
主要方法:
- 开发和应用一种新的非侵入性,现场实时成像实验设置.
- 在真空中使用单元系统 (NaCl,SrSO4,CaSO4,CaCO3) 进行过试验.
- 系统地调查天然有机物 (湿酸) 和抗剂 (PAA,基于) 对石膏化的影响.
主要成果:
- 膜表面的有机污垢 (湿酸) 加快了异质结晶,但减缓了批量晶体的生长.
- 酸通过与离子的相互作用促进了石膏异质核化,并被吸附在盐晶上.
- 抗抗剂,特别是PAA,延迟和减缓核和晶体生长,而抗抗剂显示出更有限的效果.
结论:
- 实时,现场监测为膜缩放机制提供了前所未有的洞察力.
- 了解这些机制,包括有机物和抗剂的作用,对于制定有效的缓解策略至关重要.
- 开发的装置可以指导膜过程的优化,以打击污染和缩放.
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