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Deformation and water loss from solvent filled microcapsules under compressive loads
AIChE Journal ( IF 3.7 ) Pub Date : 2020-01-08 , DOI: 10.1002/aic.16905
Justin R. Finn 1, 2 , Janine E. Galvin 1 , Rupen Panday 1, 3 , Huda Ashfaq 1, 4
Affiliation  

Microcapsules filled with liquid solvents for CO2 absorption can be easily deformed due to their elastic polymer shells. We present a combination of experiments and model predictions to demonstrate that modest compressive forces can lead to significant capsule deformation and performance issues for this enabling technology. Contrary to expectations based on Raoult's law, capsules containing aqueous carbonate solution were found to lose water to flows of humidified nitrogen in centimeter‐scale packed beds. Water loss increased with gas velocity, suggesting compression was responsible for mass transfer, an interpretation supported by microscope images of deformed and broken capsules. A model for compression induced mass transfer under packed/fluidized bed operating conditions was developed and validated with the experimental data for a range of conditions (gas velocities, temperatures, humidities). Design criteria for future generations of microcapsules that will more effectively resist compression are evaluated.

中文翻译:

压缩载荷下充满溶剂的微胶囊的变形和失水

装有液态溶剂的CO 2微胶囊由于其弹性聚合物外壳,吸收容易变形。我们提出了实验和模型预测的组合,以证明适度的压缩力会导致这种启用技术出现明显的胶囊变形和性能问题。与基于拉乌尔定律的预期相反,发现含有碳酸盐水溶液的胶囊会因厘米级填充床中的湿润氮流而失去水分。水分损失随气体速度增加而增加,表明压缩是质量传递的原因,这种解释由变形和破裂的胶囊的显微镜图像支持。开发了在填充/流化床操作条件下压缩引起的传质模型,并使用了一系列条件(气体速度,温度,湿度)。评估了将更有效地抵抗压缩的下一代微胶囊的设计标准。
更新日期:2020-04-21
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