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Modeling and simulation of CO 2 capture in aqueous ammonia with hollow fiber composite membrane contactors using a selective dense layer
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.ces.2018.06.016
Kévin Villeneuve , David Albarracin Zaidiza , Denis Roizard , Sabine Rode

Abstract Aqueous ammonia is a promising chemical absorbent for CO 2 capture but its high volatility leads to important solvent leakage necessitating expensive solvent recovery strategies. This study investigates the potential of using hollow fiber membrane contactors with composite membranes instead of packed columns to reduce solvent leakage. In this study, we used a composite membrane with a thin, dense selective layer (non-porous) coated on a microporous support to favor CO 2 transfer over NH 3 . We developed one-dimensional adiabatic multi-component transfer models to simulate the capture process using both hollow fiber membrane contactors and packed columns. These models were validated with laboratory-scale and pilot-scale data. Simulations under industrial relevant operation conditions were conducted to investigate process performance as a function of membrane characteristics, i.e. membrane dense layer thickness, selectivity and the micro-porous support mass-transfer coefficient. For contactors using homemade selective membranes, the CO 2 specific absorption capacity was of 2.7 mol/m 3 /s, which is roughly twenty times higher than values for our simulations in packed columns. The corresponding NH 3 slip reduction was of 4.3%. A parametric study revealed that thick dense membrane layers led to greater reductions of ammonia slip but that this corresponded to lower specific CO 2 absorption capacity, highlighting an important trade-off between two performance parameters.

中文翻译:

使用选择性致密层的中空纤维复合膜接触器在氨水中捕获 CO 2 的建模和模拟

摘要 氨水是一种很有前途的 CO 2 捕获化学吸收剂,但其高挥发性导致重要的溶剂泄漏,从而需要昂贵的溶剂回收策略。本研究调查了使用带有复合膜的中空纤维膜接触器代替填充柱来减少溶剂泄漏的潜力。在这项研究中,我们使用了一种复合膜,在微孔载体上涂有一层薄而致密的选择性层(无孔),以促进 CO 2 在 NH 3 上的转移。我们开发了一维绝热多组分传递模型来模拟使用中空纤维膜接触器和填充柱的捕获过程。这些模型通过实验室规模和中试规模的数据进行了验证。在工业相关操作条件下进行模拟以研究作为膜特性函数的工艺性能,即膜致密层厚度、选择性和微孔载体传质系数。对于使用自制选择性膜的接触器,CO 2 比吸收容量为 2.7 mol/m 3 /s,大约是我们在填充塔中模拟的值的 20 倍。相应的NH 3 滑移减少量为4.3%。一项参数研究表明,厚致密的膜层导致氨泄漏的减少更多,但这对应于较低的 CO 2 吸收能力,突出了两个性能参数之间的重要权衡。选择性和微孔载体传质系数。对于使用自制选择性膜的接触器,CO 2 比吸收容量为 2.7 mol/m 3 /s,大约是我们在填充塔中模拟的值的 20 倍。相应的NH 3 滑移减少量为4.3%。一项参数研究表明,厚致密的膜层导致氨泄漏的减少更多,但这对应于较低的 CO 2 吸收能力,突出了两个性能参数之间的重要权衡。选择性和微孔载体传质系数。对于使用自制选择性膜的接触器,CO 2 比吸收容量为 2.7 mol/m 3 /s,大约是我们在填充塔中模拟的值的 20 倍。相应的NH 3 滑移减少量为4.3%。一项参数研究表明,厚致密的膜层导致氨泄漏的减少更多,但这对应于较低的 CO 2 吸收能力,突出了两个性能参数之间的重要权衡。
更新日期:2018-11-01
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