Effect of Temperature on the Transport of Water and Neutral Solutes across Nanofiltration Membranes

Amar, N.; Saidani, H.; Deratani, A.; Palmeri, John

doi:10.1021/la060268p

Cited by 72 publications

(25 citation statements)

References 30 publications

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“…The DMF permeances increased with the increasing temperature, reaching 275 L m –2 h –1 bar –1 at 140 °C. This behavior is mainly due to the reduced viscosity of DMF at higher temperatures but can also be related to changes in the interactions between DMF and PEEK at different temperatures. − When we cooled the system to 25 °C and tested the DMF permeation again, the values were similar, suggesting that aging or significant compaction were not present and confirming the robustness of PEEK membranes …”

Section: Resultsmentioning

confidence: 73%

Preparation of PEEK Membranes with Excellent Stability Using Common Organic Solvents

Aristizábal

Chişcă

Pulido

et al. 2019

Ind. Eng. Chem. Res.

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Poly(ether ether ketone) (PEEK) is one of the most attractive polymers for organic solvent resistance applications because of its high thermal and organic solvent resistance. However, one of the main disadvantages is that PEEK has to be processed by using harsh solvents, such as methanesulfonic and sulfuric acid. Here, we report for the first time the preparation of PEEK membranes for organic solvent filtration by using common organic solvents. The preparation method consists of the conversion of PEEK into a soluble precursor, followed by dissolution in a mixture of tetrahydrofuran and N,N-dimethylacetamide. The resulting solution is used to obtain the membranes by phase inversion. In the second step, we convert the PEEK precursor to PEEK by treating the obtained membranes with an aqueous acid solution. The resulting PEEK membranes have good permeance and rejection, along with high stability in organic solvents and at high temperatures (up to 140 °C). This procedure opens many possibilities for processing PEEK into membranes by using common techniques to obtain flat sheet membranes or hollow fibers for a broad range of applications.

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Section: Resultsmentioning

confidence: 73%

Preparation of PEEK Membranes with Excellent Stability Using Common Organic Solvents

Aristizábal

Chişcă

Pulido

et al. 2019

Ind. Eng. Chem. Res.

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“…Moreover, it was reported that the increase in the mass transfer of solute was more significant than that of water with the increase of temperature [ 39 ], which would increase the permeate flux and reduce acid retention. The decrease of acid retention may be also attributed to the increase in membrane pore size caused by the thermal dilation of the polymer in the active layer at higher temperature [ 38 , 40 ].…”

Section: Resultsmentioning

confidence: 99%

Study on the Concentration of Acrylic Acid and Acetic Acid by Reverse Osmosis

Liu

Xie

et al. 2020

Membranes

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In the production of acrylic acid, the concentration of acrylic acid solution from the adsorption tower was low, which would lead to significant energy consumption in the distillation process to purify acrylic acid, along with the production of a large amount of wastewater. Reverse osmosis (RO) was proposed to concentrate the acrylic acid aqueous solution taken from a specific tray in the absorption tower. The effects of operating conditions on the permeate flux and acid retention were studied with two commercial RO membranes (SWC5 and SWC6). When the operating pressure was 4 MPa and the temperature was 25 °C, the permeate fluxes of two membranes were about 20 L·m−2·h−1. The acrylic acid and acetic acid retentions were about 80% and 78%, respectively. After being immersed in the acid solutions for several months, the characteristics of the two membranes were tested to evaluate their acid resistance. After six months of exposure to the acid solution containing 2.5% acrylic acid and 2.5% acetic acid, the retentions of acrylic acid and acetic acid were decreased by 5.7% and 4.1% for SWC5 and 4.9% and 2.2% for SWC6, respectively. The changes of membrane surface morphology and chemical composition showed the hydrolysis of some amide bonds.

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“… 35,36 In general, the adsorption of water on the pore walls may reduce the effective pore diameter of the membranes. 37 With rising temperature, the adsorption water layer would be thinner and the pore diameter would be larger. Some research results show that the actual pore size of NF membranes is not affected by temperature due to the effective pore diameter being larger for a thinner adsorption water layer.…”

Section: Resultsmentioning

confidence: 99%

“…Some research results show that the actual pore size of NF membranes is not affected by temperature due to the effective pore diameter being larger for a thinner adsorption water layer. 37 On the other hand, the bulk water viscosity and the intrapore viscosity may reduce with the rising temperature. Both effects would endow the NF membrane with a relatively higher flux.…”

Section: Resultsmentioning

confidence: 99%

Typical pharmaceutical molecule removal behavior from water by positively and negatively charged composite hollow fiber nanofiltration membranes

Wei

Bao

et al. 2018

RSC Adv.

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Effect of Temperature on the Transport of Water and Neutral Solutes across Nanofiltration Membranes

Cited by 72 publications

References 30 publications

Preparation of PEEK Membranes with Excellent Stability Using Common Organic Solvents

Preparation of PEEK Membranes with Excellent Stability Using Common Organic Solvents

Study on the Concentration of Acrylic Acid and Acetic Acid by Reverse Osmosis

Typical pharmaceutical molecule removal behavior from water by positively and negatively charged composite hollow fiber nanofiltration membranes

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