Ghorbani Asma, Bayati Behrouz, Drioli Enrico, Macedonio Francesca, Kikhavani Tavan, Frappa Mirko
Department of Chemical Engineering, Ilam University, Ilam 69315-516, Iran.
Institute on Membrane Technology, ITM-CNR, c/o University of Calabria, via P. Bucci, 17/C, 87036 Rende, Cosenza, Italy.
Membranes (Basel). 2021 Mar 24;11(4):230. doi: 10.3390/membranes11040230.
The formation of heat stable salts (HSS) during the natural gas sweetening process by amine solvent causes many problems such as corrosion, foaming, capacity reduction, and amine loss. A modeling study was carried out for the removal of HSS ions from amine solution using nanofiltration (NF) membrane process that ensures the reuse of amine solution for gas sweetening. This model studies the physics of the nanofiltration process by adjusting and investigating pore radius, the effects of membrane charge, and other membrane characteristics. In this paper, the performance of the ternary ions was investigated during the removal process from methyl di-ethanol amine solution by the nanofiltration membrane process. Correlation between feed concentration and permeate concentration, using experimental results with mathematical correlation as C = f (C) was used in modeling. The results showed that the calculated data from the model provided a good agreement with experimental results (R = 0.90-0.75). Also, the effect of operating conditions (including feed pressure and feed flow rate on ions rejection and recovery ratio across the flat-sheet membrane) was studied. The results showed that the recovery and rejection ratios of the NF membrane depend on the driving pressure across the membrane. While the driving pressure is affected by the feed flow conditions and feed pressure.
在天然气脱硫过程中，胺溶剂会形成热稳定盐（HSS），从而引发诸多问题，如腐蚀、发泡、容量降低以及胺损失等。开展了一项建模研究，旨在通过纳滤（NF）膜工艺从胺溶液中去除HSS离子，以确保胺溶液可再用于天然气脱硫。该模型通过调整和研究孔径、膜电荷的影响以及其他膜特性来探究纳滤过程的物理原理。本文研究了在通过纳滤膜工艺从甲基二乙醇胺溶液中去除过程中三元离子的性能。在建模过程中，利用实验结果并通过数学关联式C = f (C)来建立进料浓度与渗透物浓度之间的关联。结果表明，模型计算数据与实验结果吻合良好（R = 0.90 - 0.75）。此外，还研究了操作条件（包括进料压力和进料流速对平板膜上离子截留率和回收率的影响）。结果表明，纳滤膜的回收率和截留率取决于膜两侧的驱动压力。而驱动压力受进料流动条件和进料压力的影响。
