Kinetic modeling and simulation of non-solvent induced phase separation: Immersion precipitation of PVC-based casting solution in a finite salt coagulation bath

Aqueous phase separation (APS) is a recently developed sustainable alternative to the conventional organic solvent based nonsolvent-induced phase separation (NIPS) method to prepare polymeric membranes. In APS, polyelectrolytes are precipitated from aqueous solutions through pH or salinity switches. Although APS differs from NIPS in the polymer and solvents, they share many tuning parameters. In this work, we investigate the APS-based preparation of membranes from poly(styrene-alt-maleic acid) (PSaMA) with a focus on acid concentration in the coagulation bath, and polymer and additive concentration in the casting solution. Nanofiltration membranes are prepared using significantly lower concentrations of acid: 0.3 M HCl compared to the 2 M of either acetic or phosphoric acid used in previous works. It is shown that higher polymer concentrations can be used to prevent defect formation in the top layer. In addition, acetic acid concentration also strongly affects casting solution viscosity and thus can be used to control membrane structure, where lower acetic acid concentrations can prevent the formation of macrovoids in the support structure. The prepared nanofiltration membranes exhibit a very low molecular weight cutoff (210 ± 40 dalton), making these sustainable membranes very relevant for the removal of contaminants of emerging concern. Understanding how the parameters described here affect membrane preparation and performance is essential to optimizing membranes prepared with APS towards this important application.

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Kinetic modeling and simulation of high-temperature by-product formation from urea decomposition

Chemical Engineering Science ◽

10.1016/j.ces.2021.116876 ◽

2021 ◽

pp. 116876

Author(s):

C. Kuntz ◽

C. Kuhn ◽

H. Weickenmeier ◽

S. Tischer ◽

M. Börnhorst ◽

...

Keyword(s):

High Temperature ◽

Modeling And Simulation ◽

Kinetic Modeling ◽

Product Formation ◽

Urea Decomposition

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Kinetic modeling and simulation study for a sequential electrochemical extractive crude diesel desulfurization

Separation and Purification Technology ◽

10.1016/j.seppur.2021.119587 ◽

2021 ◽

pp. 119587

Author(s):

Yadollah Tavan ◽

Fatola Farhadi ◽

Mohammad Shahrokhi

Keyword(s):

Modeling And Simulation ◽

Kinetic Modeling ◽

Simulation Study

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Population Semiphysiologic Kinetic Modeling and Simulation of Plasma Triglyceride Levels After Soybean Oil–Based Intravenous Lipid Emulsion Administration in Rats

Journal of Parenteral and Enteral Nutrition ◽

10.1177/0148607116661030 ◽

2016 ◽

Vol 41 (8) ◽

pp. 1356-1365 ◽

Cited By ~ 1

Author(s):

Akira Okada ◽

Miyu Hirano ◽

Maho Tanioka ◽

Takae Tsujimoto ◽

Hikaru Koyama ◽

...

Keyword(s):

Soybean Oil ◽

Modeling And Simulation ◽

Kinetic Modeling ◽

Lipid Emulsion ◽

Plasma Triglyceride ◽

Intravenous Lipid Emulsion

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Development of Antifouling Polysulfone Membranes by Synergistic Modification with Two Different Additives in Casting Solution and Coagulation Bath: Synperonic F108 and Polyacrylic Acid

Materials ◽

10.3390/ma15010359 ◽

2022 ◽

Vol 15 (1) ◽

pp. 359

Author(s):

Katsiaryna S. Burts ◽

Tatiana V. Plisko ◽

Mikael Sjölin ◽

Goncalo Rodrigues ◽

Alexandr V. Bildyukevich ◽

...

Keyword(s):

Polyethylene Glycol ◽

Polyacrylic Acid ◽

Process Water ◽

Coagulation Bath ◽

Interpolymer Complex ◽

Polypropylene Glycol ◽

Layer Surface ◽

Membrane Modification ◽

Selective Layer ◽

Casting Solution

This study deals with the development of antifouling ultrafiltration membranes based on polysulfone (PSF) for wastewater treatment and the concentration and purification of hemicellulose and lignin in the pulp and paper industry. The efficient simple and reproducible technique of PSF membrane modification to increase antifouling performance by simultaneous addition of triblock copolymer polyethylene glycol-polypropylene glycol-polyethylene glycol (Synperonic F108, Mn =14 × 103 g mol−1) to the casting solution and addition of polyacrylic acid (PAA, Mn = 250 × 103 g mol−1) to the coagulation bath is proposed for the first time. The effect of the PAA concentration in the aqueous solution on the PSF/Synperonic F108 membrane structure, surface characteristics, performance, and antifouling stability was investigated. PAA concentrations were varied from 0.35 to 2.0 wt.%. Membrane composition, structure, and topology were investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The addition of PAA into the coagulation bath was revealed to cause the formation of a thicker and denser selective layer with decreasing its pore size and porosity; according to the structural characterization, an interpolymer complex of the two additives was formed on the surface of the PSF membrane. Hydrophilicity of the membrane selective layer surface was shown to increase significantly. The selective layer surface charge was found to become more negative in comparison to the reference membrane. It was shown that PSF/Synperonic F108/PAA membranes are characterized by better antifouling performance in ultrafiltration of humic acid solution and thermomechanical pulp mill (ThMP) process water. Membrane modification with PAA results in higher ThMP process water flux, fouling recovery ratio, and hemicellulose and total lignin rejection compared to the reference PSF/Synperonic F108 membrane. This suggests the possibility of applying the developed membranes for hemicellulose concentration and purification.

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