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氯化钠影响膜蒸馏过程中硫酸钙结垢行为的原位分析

作者：曹鑫茂，曾艳辉，刘杰，李炜怡

单位： 1. 广西师范大学化学与药学学院，桂林 541004； 2. 广西师范大学环境与资源学院，桂林 541006

关键词：膜蒸馏；硫酸钙垢；氯化钠；晶-膜相互作用；光学相干层析

DOI号： 10.16159/j.cnki.issn1007-892 4.2025.06.012

分类号： TQ028； TK2

出版年,卷(期):页码： 2025,45(6):108-115

摘要：

在膜蒸馏（MD）过程中，硫酸钙的结垢不仅显著降低蒸发效率，还会诱发疏水孔道润湿，甚至对聚合物网络结构造成不可逆损伤。氯化钠作为背景电解质（即有着显著高溶解度的无机盐类）对硫酸钙结垢行为的影响在过去的研究中往往被忽略。本研究在传统表征的基础上，采用光学相干层析（OCT）技术，原位对比分析在料液中不含有和含有氯化钠条件下硫酸钙结垢对MD性能的影响。不同表征结果都证实了氯化钠的存在虽然延缓硫酸钙的成核和晶体生长，但同时会改变晶形而显著增强晶-膜相互作用，并造成疏水膜的润湿和不可逆损伤。本研究将有助于开发在MD过程中缓解结垢影响的有效策略。

The scaling of calcium sulfate in membrane distillation (MD) can not only substantially decrease the evaporation efficiency, but also induce the wetting of hydrophobic pores, even result in irreversible damage of the polymeric network. The effects of sodium chloride, as a background electrolyte (i.e., an inorganic salt having a considerably higher solubility), on the scaling behavior of calcium sulfate are usually ignored in prior studies. In addition to conventional characterizations, this study employed optical coherence tomography (OCT) to in-situ characterize and compared how the scaling of calcium sulfate could have impacts on the MD performance in the absence and presence of sodium chloride. It was revealed by these different characterizations that, despite the delayed nucleation and crystal growth, significantly stronger crystal-membrane interactions could be caused by sodium chloride (owing to the change in crystalline morphology). This study will shed light on developing effective strategies to mitigate the effects of scaling on MD processes.

基金项目：

国家自然科学基金项目（21878140）

作者简介：

曹鑫茂（2005-），男，江西上饶人，研究方向为膜分离技术；曾艳辉（2002-），男，湖南衡阳人，硕士研究生，研究方向为膜分离技术.

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