Formation and characterization of polytetrafluoroethylene nanofiber membranes for vacuum membrane distillation

Zhou, Tao; Yao, Yongyi; Xiang, Ruili; Wu, Yaowen

doi:10.1016/j.memsci.2013.11.027

Cited by 98 publications

(51 citation statements)

References 39 publications

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“…During the spinning process, the fluid flow rate was kept at 0.5 mL h −1 , the voltage applied to the needle was 15 kV, and the spinneret/collector distance was kept at 15 cm. Lastly, a sintering process was carried out for the PTFE membrane in a muffle furnace (in air medium) at 390 °C (Zhou et al 2014). This temperature was higher than the melting point of PTFE (~ 330 °C) (Xiong et al 2009) and the decomposition temperature of PVA (above 270 °C), the PVA nanofiber was supposed to decompose, and PTFE particles dispersed on the PVA nanofiber were supposed to fuse together to compose a perpetual nanofiber (Qing et al 2017).…”

Section: Manufacturing Process Of Ptfe Membranementioning

confidence: 99%

Membrane-based downhole oil–water separation (DOWS) technology: an alternative to hydrocyclone-based DOWS

Patel

Pawar

et al. 2020

J Petrol Explor Prod Technol

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Produced water handling has become one of the central concerns for the oil and gas industry today. Produce water (water cut) increases as the field grows old, which brings the additional handling cost to the project. The additional expense could be in terms of lifting cost, treatment, maintenance, tubular scaling, corrosion problems, bacteria, naturally occurring radioactive material and environmental regulations, etc. To address this problem, the hydrocarbon industry developed the downhole oilwater separation (DOWS) technology in the 1990s. In spite of having such cost-effective and environment-friendly solutions, the industry has limited sites using this technique. Thus, there is uttermost need to evaluate the problems in practicality of the current hydrocyclone-based and gravity-based DOWS and find a reliable solution to it. The membrane-based separation methodology represents the coherent solution to robust the downhole separation system that does not require any moveable equipment with advance sensors and mechanical tools. If the reservoir is well characterized and a reliable simulation model is built, it is possible to predict the optimal time for the placement of a specific length of membrane in the well depending on the layer concerned and inclination of the well. Apart from designing the thin and porous hydrophobic and oleophilic membranes, there are plenty of field challenges which have put constraints on the practicality of membrane-based DOWS. The major constraints are durable range of separation pressure, fouling, separation process design, membrane-shear durability. The objective of this study is to present a novel model of PTFE (polytetrafluoroethylene) membrane-based downhole oilwater separation system with its over all functionality and addresses the constraints mentioned above with promising existing working solutions. Moreover, the study also literature reviews and compares the expenditure and maintenance involved in manufacturing, installation, operating and maintenance of system, between the conventional hydrocyclone-based downhole water separation and the proposed (PTFE) membrane-based DOWS.

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Section: Manufacturing Process Of Ptfe Membranementioning

confidence: 99%

Membrane-based downhole oil–water separation (DOWS) technology: an alternative to hydrocyclone-based DOWS

Patel

Pawar

et al. 2020

J Petrol Explor Prod Technol

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“…The driving force in the MD process is the vapor pressure difference induced by the temperature difference between the feed and permeate flows [59]. Some researchers also reported other electrospun superhydrophobic nanofiber membranes for MD operation, such as electrospun aromatic fluorinated polyoxadiazoles and polytriazoles membranes [72], electrospun PTFE nanofiber membrane [73] and dual-biomimetic superhydrophobic electrospun PS micro/nano-fibrous membranes [74], which all showed superior performance in purifying the NaCl feed solutions over conventional MD membranes. Thus, electrospun nanofiber membranes with superhydrophobic properties and suitable pore sizes are ideally suited for MD applications for desalination of seawater or brackish water.…”

Section: Nanofiber Membranes For Membrane Distillationmentioning

confidence: 99%

Electrospun nanofiber membranes

Wang

Hsiao

2016

Current Opinion in Chemical Engineering

234

105

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The development of nanofiber technology offers viable means to produce nanofibrous articles, useful for many health, energy and environmental applications. In specific, polymeric nanofibers fabricated by electrospinning can be used as effective membrane materials for environmental remediation due to the light weight, high surface area and interconnected porous structure. In this paper, we review some recent advances in electrospinning for mass production of nanofiber membranes, especially suitable for water purification. These electrospun nanofibers not only can form highly porous membranes with controlled pore size, but also can be functionalized to enhance the separation performance. Various composite membrane formats containing different arrangements of nanofibers have been demonstrated for many sorts of water applications, including microfiltration, ultrafiltration, nanofiltration, reverse osmosis, membrane distillation and adsorption.

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“…Coating polyolefin microporous separators using ceramic particles along with fluorinated binders {i.e., Poly[vinylidene Fluoride] (PVDF) or Poly [difluoroethylene‐ co ‐hexafluoropropylene] (PVDF‐HFP)} is one of the effective methods to reinforce the dimensional stability of the polyolefin separators. Alumina and silica, as the most common coating materials, have been extensively studied. The surface coating can greatly improve the liquid uptake, ion conductivity, electrochemical stability of the separator, and battery performance.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical performance and thermal stability of the electrospun PTFE nanofiber separator for lithium‐ion batteries

Zhong

Yao

et al. 2018

J of Applied Polymer Sci

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Separator is a very important set of lithium-ion batteries. At present, low porosity and poor thermal stability are two major disadvantages of separator. In this work, we first apply electrospinning method to prepare the Polytetrafluoroethylene (PTFE) nanofiber separator, which has the advantages of electrospinning method and PTFE materials. The effect of the PTFE nanofiber separator is investigated by scanning electron microscope, Capillary Flow Porometer, thermogravimetric-differential scanning calorimeter, linear sweep voltammeter, AC impedance, and charge/discharge cycling tests. The results demonstrate that the PTFE nanofiber separator has a special fiber structure made from PTFE particles gathering one by one along the fibers. Moreover, the PTFE nanofiber separator exhibits several advantages, including suitable pore diameter, uniform pore size distribution, high porosity, and electrolyte uptake, which enhance the ionic conductivity. The thermal stability of the PTFE nanofiber separator is much better than that of the conventional polyolefin separator. The Li/LiCoO 2 cell equipped with PTFE nanofiber separator exhibits excellent rate performance and first charge-discharge specific capacity of 142 and 131 mA h g 21 , respectively, accompanied by relatively stable cycle performance at 0.2 C rate. It is supposed to be a candidate for application in lithium-ion batteries. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2018, 135, 46508.

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Formation and characterization of polytetrafluoroethylene nanofiber membranes for vacuum membrane distillation

Cited by 98 publications

References 39 publications

Membrane-based downhole oil–water separation (DOWS) technology: an alternative to hydrocyclone-based DOWS

Membrane-based downhole oil–water separation (DOWS) technology: an alternative to hydrocyclone-based DOWS

Electrospun nanofiber membranes

Electrochemical performance and thermal stability of the electrospun PTFE nanofiber separator for lithium‐ion batteries

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