Modeling of Nanofiltration Process Using DSPM-DE Model for Purification of Amine Solution

Abstract

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 Ci,p = f (Ci,f) was used in modeling. The results showed that the calculated data from the model provided a good agreement with experimental results (R2 = 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.

Comparative Analysis of Donnan Steric Partitioning Pore Model and Dielectric Exclusion Applied to the Fractionation of Aqueous Saline Solutions through Nanofiltration

“…Various authors have investigated the transport of neutral and colloidal solutes, along with their respective rejection in membrane processes [71,82,83]. From a comparative analysis of various models developed to describe NF, it was concluded that the Nernst-Planck equation was the most suitable for predicting the mechanisms of transport and ionic selectivity in NF [84][85][86][87]. Subsequently, the Donnan Steric Partitioning Model (DSPM) was applied, based on the extended Nernst-Planck equation, modified by incorporating hindered transport factors for both diffusion and convection [71,88,89].…”

Model-Based Optimization of Multi-Stage Nanofiltration Using the Solution-Diffusion–Electromigration Model

“…Table S2: Parameters used for case study 1 in Equations ( 1) and (5). Permeances (Equation ( 1)) of the artificial equimolar mixture of the dissolved salts MA and M 2 B are taken from Yaroshchuk and Bruening [14]. Table S3: Case Study 1-used parameters without optimization in modeling with constant pump pressure (8 bar) in Equations (S1), (S2), (S5), and (S6).…”

“…Nevertheless, there are models to describe aqueous nanofiltration, such as the Spiegler-Kedem transport model [10], Teorrell-Meyer-Sievers model [11] and the Donnan-steric-pore-dielectric exclusion model (DSPM-DE) [12]. The latter has been applied for different nanofiltration applications, such as the separation of NaCl /Na 2 SO 4 [13], the purification of amine solutions [14], and the prediction of rejection of various single salt solutions [15]. Wang and Lin [16] stated that the DSPM-DE model requires excessive experiments and lacks in prediction performance.…”

Rejection Mechanism of Ionic Solute Removal by Nanofiltration Membranes: An Overview

“…By incorporating the dielectric effect into the DSPM, this model is referred to as the Donnan steric pore model with dielectric exclusion (DSPM–DE) model. More recently, this model has been used widely by various researchers [ 77 , 78 , 79 , 80 ]. One of the highlighted studies explored the effect of dielectric constant in NF membrane [ 81 ].…”