scholarly journals Asymmetrically Wettability Janus Cotton Fabrics Fabricated via Interfacial Ion Migration for Surfactant-stabilized Oil-in-water Emulsions

2021 ◽  
Author(s):  
Pu Yang ◽  
Ruimin Hu ◽  
Bin Yu ◽  
Yiwei Sun ◽  
Yiping Liu ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Separation Efficiency ◽  
Human Life ◽  
Sodium Dodecyl ◽  
Separation Performance ◽  
Step Method ◽  
Ion Migration ◽  
Oil In Water ◽  
Fabric Surface ◽  
High Separation

Abstract Separation of surfactant-stabilized oil-water emulsions seems to be challenging owing to its diverse repercussions on environment and human life. The asymmetrical wettability Janus cotton fabric (J-MH@CF) with high separation performance was prepared by two-step method, which related to interfacial ion migration technology and unilateral spraying treatment. In detail, the immobilization of magnesium hydroxide (Mg(OH)2) caused the formation of the rough micro/nanostructure of cotton fabric surface, which was helpful to superhydrophilic property. Stearic acid as a coating created the unilateral superhydrophobic surface with low surface energy. J-MH@CF showed asymmetric wettability, featuring diode-like directional water transmission. Wettability, directional transmission and separation performance of J-MH@CF membrane were investigated systematically. The asymmetric wettability architecture was demonstrated to play a key role in separating surfactant-stabilized oil-in-water emulsions. Impressingly, the separation performance was not affected by the type of surfactants. For emulsion stabilized by sodium dodecyl sulfate (SDS), the separation flux driven by gravity was approximately 500 L m-2h-1, and all separation efficiencies were over 99.3%. CTAB/Oil/H2O emulsion and the Tween-60/Oil/H2O emulsion also could be successfully separated with high separation efficiency and separation flux. During the whole separation process, the oil droplets surrounded by surfactants (Oil-Ss) were difficult to demulsify and gathered on the surface of the fabric to form a "creamy layer", which was beneficial to improve separation efficiency and could be cleaned off so that J-MH@CF membrane was not contaminated. In addition, the J-MH@CF membrane exhibited robust reusability for separation, which was promising for remediation of oily wastewater containing surfactants.

scholarly journals A Novel Modified Cotton Fabric with Durable Anti-Fouling Performance for Separation of Surfactant-stabilized Oil-in-water Emulsions

2021 ◽  
Author(s):  
Pu Yang ◽  
Ruimin Hu ◽  
Yu Bin ◽  
Yiwei Sun ◽  
Yiping Liu ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Separation Efficiency ◽  
Protective Layer ◽  
Separation Performance ◽  
Step Method ◽  
Nano Structure ◽  
Ion Migration ◽  
Oil In Water ◽  
Tween 60 ◽  
Fabric Surface

Abstract Membrane applications for the separation of surfactant-stabilized emulsions are often constrained by a deficiency in permeability and anti-fouling properties. Herein, special wetted cotton fabric with a protective layer (P-MH@CF) for durable anti-fouling performance was designed by a two-step method, which was related to interfacial ion migration technology and unilateral spraying treatment. In detail, the immobilization of magnesium hydroxide caused the formation of the rough micro/nano structure of the cotton fabric surface. The stearic acid acted as a protective layer, like a quilt, protecting the membrane from contamination. Permeability of water and separation performance of P-MH@CF membrane were investigated systematically. For emulsion stabilized by SDS (SDS/Oil/H2O), the separation flux driven by gravity was approximately 500 L m -2 h -1 , and all separation efficiencies were over 99.3 %. CTAB/Oil/H2O emulsion and the Tween-60/Oil/H2O emulsion also could be successfully separated with high separation efficiency and separation flux. During the whole separation process, the oil droplets surrounded by surfactants were difficult to demulsify and gathered physically on the surface of the fabric to form a "creamy layer", which could be cleaned off so that the P-MH@CF membrane was not contaminated. In addition, the P-MH@CF membrane exhibited robust reusability for separation, which was promising for the remediation of oily wastewater containing surfactants.

scholarly journals In-situ self-dissolving and regenerating synthesis of superwetting cotton fabric with excellent oil/water emulsions separation performance

2021 ◽  
Author(s):  
Sudong Yang ◽  
Lin Chen ◽  
Shanshan Wang ◽  
Shuai Liu
Keyword(s):  
Cotton Fabric ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Hydrophilic Surface ◽  
Water Emulsion ◽  
Oil In Water ◽  
Underwater Superoleophobicity ◽  
Oil In Water Emulsion ◽  
Fabric Surface

Abstract The textiles with superhydrophilicity and underwater superoleophobicity have shown excellent separation performance for emulsified oil in wastewater, but they still suffer from complicated construct of hierarchical architectures and hydrophilic surface. Herein, a hydrophilic hierarchical layer of cellulose is constructed on commercial cotton fabric surface via a proposed in-situ self-dissolving and regenerating strategy. The cellulose provides both hydrophilic surface and hierarchical structural foundation for the remodeled cotton fabric (RCF) without any further chemical modification. The obtained RCF has strong superhydrophilicity, underwater superoleophobicity, and anti-oil-adhesion property, which can be applicable for efficient oil-in-water emulsion separation with high separation efficiency and recyclable antifouling performance. The developed RCF assembly strategy provides an excellent membrane for the separation of oil-in-water emulsion, and a new prospect for the convenient and universal construct of other superwetting cellulose-based materials.

scholarly journals Treating Wet Oil in Amara Oil Field Using Nanomaterial (SiO2) With Different Types of De emulsifiers

2021 ◽  
Vol 22 (1) ◽  
pp. 29-38
Author(s):  
Ayat Ragheb Alkarbalaee ◽  
Adel Sharif Hammadi ◽  
Ghassan Hamid Abdul Majeed
Keyword(s):  
Acidic Medium ◽  
Separation Efficiency ◽  
Sodium Dodecyl ◽  
Separation Process ◽  
Oil Field ◽  
Oil Refining ◽  
Ph Values ◽  
Different Types ◽  
Separation Results ◽  
High Separation

One of the most important problems in the oil production process and when its continuous flow, is emulsified oil (w/o emulsion), which in turn causes many problems, from the production line to the extended pipelines that are then transported to the oil refining process. It was observed that the nanomaterial (SiO2) supported the separation process by adding it to the emulsion sample and showed a high separation rate with the demulsifiers (RB6000) and (sebamax) where the percentage of separation was greater than (90 and 80 )%  respectively, and less than that when dealing with (Sodium dodecyl sulfate and Diethylene glycol), the percentage of separation was (60% and 50%) respectively.    The high proportion of (NaCl + distilled water) raises the probability of the separation efficiency as the separation was (88.5,79)% and (65.5, 55) %  for (RB6000, SebaMax)respectively with (SiO2) at 70 °C, while the results of separation were (77,85)% and (65,40)  for (RB6000, Seba Max) respectively with (SiO2) at 50 °C after 120 minutes, where the (w/o ratio) was (9:1) for the high separation results and (7:3) for the lower separation results, at a speed of (12000rpm), and with a salt concentration of (1500) ppm, and less of these results at lower volumetric and temporal conditions. The (NaCl) salt deals with the wall films separating the droplets and reduces their viscosity [1].    As for the pH factor, it is at the value (2 and 3) represent a stable emulsion that is difficult to separate easily, but with the passage of raising the pH away from the acidic medium and near to the basic direction, a significant increase in the separation process was observed compared with the acidic medium at lower values, after 120 minutes the separation seemed to be good efficient, reaching (60 and 70) % respectively, while at the same time the emulsion reached a more efficient separation level with a pH of (  8 and 7) equal to (80 and 87.3)  %, at 50 °C with SebaMax demulsifier in presence of (SiO2), and with the same pH values, an increase was observed in the separation with the increase in temperature to (70 °C), then it returns to be a reverse emulsifier when the value exceeds (10) to (11, 12, 13).

scholarly journals Superhydrophilic fluorinated polyarylate membranes via in situ photocopolymerization and microphase separation for efficient separation of oil-in-water emulsion

RSC Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 958-962 ◽  
Author(s):  
Hui Li ◽  
Cuiping Zhou ◽  
Chunsheng Li ◽  
Xiaohui Li ◽  
Shuxiang Zhang
Keyword(s):  
Tensile Strength ◽  
Separation Efficiency ◽  
Microphase Separation ◽  
High Tensile Strength ◽  
Water Emulsion ◽  
Efficient Separation ◽  
Oil In Water ◽  
Oil In Water Emulsion ◽  
High Separation

We have developed a novel superhydrophilic FPAR membrane with high tensile strength by in situ photocopolymerization and microphase separation, which can effectively separate oil-in-water emulsions with high separation efficiency and flux.

Numerical Simulation of a Gas-Liquid Cylindrical Cyclone

2012 ◽  
Vol 516-517 ◽  
pp. 1058-1061 ◽  
Author(s):  
Ming Hu Jiang ◽  
Zhen Wang ◽  
Jia Li You ◽  
Li Xin Zhao
Keyword(s):  
Pressure Drop ◽  
Gas Phase ◽  
Pressure Field ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Distribution Characteristics ◽  
Cylindrical Cyclone ◽  
Computational Fluid Dynamics Cfd ◽  
Inlet Position ◽  
High Separation

Inner flow field, pressure field and gas phase concentration of the gas-liquid cylindrical cyclone (GLCC) was studied and simulated with a Fluent soft pack by means of Computational Fluid Dynamics (CFD). Distribution characteristics of pressure drop and velocity field of the GLCC reveal that the inlet position and the outlet diameter of overflow can affect its separation performance. Low pressure drop and high separation efficiency can be obtained by designing the inlet position and the overflow tube diameter.

Ultralight free-standing reduced graphene oxide membranes for oil-in-water emulsion separation

2015 ◽  
Vol 3 (40) ◽  
pp. 20113-20117 ◽  
Author(s):  
Na Liu ◽  
Miao Zhang ◽  
Weifeng Zhang ◽  
Yingze Cao ◽  
Yuning Chen ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Free Standing ◽  
Water Emulsion ◽  
Oil In Water ◽  
Reduced Graphene ◽  
Emulsion Separation ◽  
Oil In Water Emulsion ◽  
Oxide Membranes ◽  
High Separation ◽  
Graphene Oxide Membranes

Ultralight free-standing RGO membranes are capable of separating multiple types of surfactant stabilized oil-in-water emulsions with high separation efficiency.

Field testing CFD-based predictions of storage chamber gross solids separation efficiency

1999 ◽  
Vol 39 (9) ◽  
pp. 161-168 ◽  
Author(s):  
Virginia R. Stovin ◽  
Adrian J. Saul ◽  
Andrew Drinkwater ◽  
Ian Clifforde
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Settling Velocity ◽  
Separation Efficiency ◽  
Flow Patterns ◽  
Total Efficiency ◽  
Separation Performance ◽  
Storage Chamber ◽  
Solids Separation ◽  
Simulated Flow

The use of computational fluid dynamics-based techniques for predicting the gross solids and finely suspended solids separation performance of structures within urban drainage systems is becoming well established. This paper compares the result of simulated flow patterns and gross solids separation predictions with field measurements made in a full size storage chamber. The gross solids retention efficiency was measured for six different storage chambers in the field and simulations of these chambers were undertaken using the Fluent computational fluid dynamics software. Differences between the observed and simulated flow patterns are discussed. The simulated flow fields were used to estimate chamber efficiency using particle tracking. Efficiency results are presented as efficiency cusps, with efficiency plotted as a function of settling velocity. The cusp represents a range of efficiency values, and approaches to the estimation of an overall efficiency value from these cusps are briefly discussed. Estimates of total efficiency based on the observed settling velocity distribution differed from the measured values by an average of ±17%. However, estimates of steady flow efficiency were consistently higher than the observed values. The simulated efficiencies agreed with the field observations in identifying the most efficient configuration.

Miscible blend polyethersulfone/polyimide asymmetric membrane crosslinked with 1,3-diaminopropane for hydrogen separation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Nur’ Adilah Abdul Nasir ◽  
Ameen Gabr Ahmed Alshaghdari ◽  
Mohd Usman Mohd Junaidi ◽  
Nur Awanis Hashim ◽  
Mohamad Fairus Rabuni ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Chemical Characterization ◽  
Gas Permeation ◽  
Separation Performance ◽  
Membrane Composition ◽  
Asymmetric Membrane ◽  
Wet Phase Inversion ◽  
Pair Performance ◽  
Improved Performance ◽  
Physical And Chemical

Abstract Efficient purification technology is crucial to fully utilize hydrogen (H2) as the next generation fuel source. Polyimide (PI) membranes have been intensively applied for H2 purification but its current separation performance of neat PI membranes is insufficient to fulfill industrial demand. This study employs blending and crosslinking modification simultaneously to enhance the separation efficiency of a membrane. Polyethersulfone (PES) and Co-PI (P84) blend asymmetric membranes have been prepared via dry–wet phase inversion with three different ratios. Pure H2 and carbon dioxide (CO2) gas permeation are conducted on the polymer blends to find the best formulation for membrane composition for effective H2 purification. Next, the membrane with the best blending ratio is chemically modified using 1,3-diaminopropane (PDA) with variable reaction time. Physical and chemical characterization of all membranes was evaluated using field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR). Upon 15 min modification, the polymer membrane achieved an improvement on H2/CO2 selectivity by 88.9%. Moreover, similar membrane has demonstrated the best performance as it has surpassed Robeson’s upper bound curve for H2/CO2 gas pair performance. Therefore, this finding is significant towards the development of H2-selective membranes with improved performance.

scholarly journals Separation of Radionuclides from a Rare Earth-Containing Solution by Zeolite Adsorption

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Deniz Talan ◽  
Qingqing Huang
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Contact Time ◽  
Separation Efficiency ◽  
Ph Value ◽  
Solid Phase ◽  
Separation Performance ◽  
Solution Ph ◽  
Zeolite Sample ◽  
Alternative Sources

The increasing industrial demand for rare earths requires new or alternative sources to be found. Within this context, there have been studies validating the technical feasibility of coal and coal byproducts as alternative sources for rare earth elements. Nonetheless, radioactive materials, such as thorium and uranium, are frequently seen in the rare earths’ mineralization, and causes environmental and health concerns. Consequently, there exists an urgent need to remove these radionuclides in order to produce high purity rare earths to diversify the supply chain, as well as maintain an environmentally-favorable extraction process for the surroundings. In this study, an experimental design was generated to examine the effect of zeolite particle size, feed solution pH, zeolite amount, and contact time of solid and aqueous phases on the removal of thorium and uranium from the solution. The best separation performance was achieved using 2.50 g of 12-µm zeolite sample at a pH value of 3 with a contact time of 2 h. Under these conditions, the adsorption recovery of rare earths, thorium, and uranium into the solid phase was found to be 20.43 wt%, 99.20 wt%, and 89.60 wt%, respectively. The Freundlich adsorption isotherm was determined to be the best-fit model, and the adsorption mechanism of rare earths and thorium was identified as multilayer physisorption. Further, the separation efficiency was assessed using the response surface methodology based on the development of a statistically significant model.

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