Effect of crosslinking on organic solvent nanofiltration performance of cellulose membranes

Download

index.pdf

Date

2018

Author

Konca, Kübra

Metadata

Show full item record

Item Usage Stats

302
views

123
downloads

Nanofiltration is a membrane process capable of separation of small molecules and multivalent ions due to their size and/or charge. NF is mainly used in aqueous applications. However, there are many processes that can take advantages of NF in molecules separation dissolved in organic solvents. Main challenge in Organic Solvent Nanofiltration is the limited number of membranes which can withstand a wide range solvents and have stable, predictable separation performance. Cellulose is an alternative polymer that can be used in OSN membranes as it is stable in many organic solvents due to its inter- and intra- molecular hydrogen bonds. Cellulose membranes were fabricated via phase inversion. Solutes used in tests are Bromothymol Blue (neutral,624 Da,=251.1cm3/mole), Cresol Red (neutral,382 Da,=140.1cm3/mole), Rose Bengal (anionic,1017 Da,=241.0cm3/mole) and Brilliant Blue R (anionic,826 Da,=421.3cm3/mole) and Crystal Violet (cationic,407 Da,=253.7cm3/mole). Membranes were crosslinked using two crosslinking agents: glutaraldehyde and 1,2,3,4-butanetetracarboxylic acid. Cellulose membranes was tested with five different solutes.Molecular size is a determining factor for separation of neutral dyes since BTB rejection is higher ratio than CR. BTB and CV rejections are quite close to each other while RB is retained much less than these dyes although molecular size of them are similar. GA-crosslinking did not change solvent permeance and solute rejection. After BTCA-crosslinking, CV rejection decreases slightly while RB rejection increases significantly. Amount of sorbed RB during filtration decreases significantly whereas sorbed CV increases, which may explain increased RB rejection, decreased CV rejection.

Subject Keywords

Membranes (Technology)., Organic solvents., Nanofiltration., Cellulose.

URI

http://etd.lib.metu.edu.tr/upload/12622881/index.pdf
https://hdl.handle.net/11511/27868

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Investigation of phase inversion behavior of cellulose- ionic liquid solutions in relationship with membrane formation Durmaz, Elif Nur; Çulfaz Emecen, Pınar Zeynep; Department of Chemical Engineering (2017) Cellulose membranes were produced from ionic liquid solutions by phase inversion technique and thermodynamic and kinetic aspects of the process were investigated to relate these to membrane morphology and performance. In thermodynamics part, polymer-solvent, polymer-nonsolvent and polymer-solvent-nonsolvent interactions were examined experimentally, together with Hansen solubility parameter estimations. Kinetics part consisted of measuring phase inversion rate. Obtained membranes were characterized by their...
EFFECT OF FEED COMPOSITION ON THE PERFORMANCE OF POLYMER-ZEOLITE MIXED MATRIX GAS SEPARATION MEMBRANES BATTAL, T; BAC, N; Yılmaz, Levent (Informa UK Limited, 1995-01-01) An emerging membrane morphology with future potential is mixed matrix membranes composed of two interpenetrating matrices of different materials. In this study, mixed matrix membranes of an amorphous glassy polymer(polyethersulfone) and hydrophilic zeolite (4A) were prepared. An elaborate membrane preparation technique that enables incorporation of high zeolite loading into the membrane was developed. Performance of membranes was tested by using a laboratory-scale gas separation apparatus. The permeation ra...
Effects of Isoflurane, Halothane, and Chloroform on the Interactions and Lateral Organization of Lipids in the Liquid-Ordered Phase Türkyılmaz, Serhan; Regen, Steven L. (2011-12-06) The first quantitative insight has been obtained into the effects that volatile anesthetics have on the interactions and lateral organization of lipids in model membranes that mimic "lipid rafts". Specifically, nearest-neighbor recogntion measurements, in combination with Monte Carlo simulations, have been used to investigate the action of isoflurane, halothane, and chloroform on the compactness and lateral organization of cholesterol-rich bilayers of 1,2-dipalmitoylsn-glycero-3-phosphocholine (DPPC) in the...
Cellulose membranes for organic solvent nanofiltration Sukma, Faqih Muhamad; Çulfaz Emecen, Pınar Zeynep; Department of Chemical Engineering (2016) Cellulose is an alternative polymer that can be used in Organic Solvent Nanofiltration (OSN) where lack of chemically-stable membranes is a major problem. Cellulose, due to strong inter and intramolecular hydrogen bonding, is difficult to dissolve in many solvents, which is an advantage for OSN applications. Common solvent systems like Sodium Hydroxide/Carbon Disulfide (NaOH/CS2) or N-Methylmorpholine-N-oxide (NMMO) for cellulose solubilization are either toxic or unstable. Recent studies have shown that th...
Effect of preparation parameters on the performance of conductive composite gas separation membranes Gulsen, D; Hacarloglu, P; Toppare, Levent Kamil; Yılmaz, Levent (2001-02-15) Mixed matrix composite membranes of a conducting polymer, polypyrrole (PPy), and an insulating polymer, polybisphenol-A-carbonate (PC) were prepared by a combined in-situ polymerization and solvent evaporation. Mixed matrix composite membranes were synthesized to combine the good gas transport properties of conductive polymer, PPy, with good mechanical properties of PC.

Citation Formats

K. Konca, “Effect of crosslinking on organic solvent nanofiltration performance of cellulose membranes,” M.S. - Master of Science, Middle East Technical University, 2018.