Precipitation Phase Inversion Algorithm for Extremely Unbalanced Data

2020 ◽  
pp. 312-323
Author(s):  
Shengchun Wang ◽  
Chengcheng Jiang ◽  
Jingui Huang ◽  
Jinyu Xu ◽  
Hong Deng ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Unbalanced Data ◽  
Inversion Algorithm ◽  
Precipitation Phase

Membrane Formation Mechanism for Water-Solvent-PVDF Systems and Membrane Structure for Ultrafiltration Application

2012 ◽  
Vol 578 ◽  
pp. 129-132 ◽  
Author(s):  
Dan Ying Zuo ◽  
Hong Jun Li
Keyword(s):  
Phase Separation ◽  
Formation Mechanism ◽  
Membrane Structure ◽  
Phase Inversion ◽  
Skin Layer ◽  
Membrane Formation ◽  
Water Solvent ◽  
Kinetic Diffusion ◽  
Solid Liquid ◽  
Precipitation Phase

Through immersion precipitation phase inversion, poly(vinyldiene fluoride) (PVDF) membranes applied in ultrafiltration were prepared. The influences of four solvents on the phase separation of PVDF casting solutions and membrane structure were discussed by mechanism of skin-sublayer two steps precipitation. The results showed that the delayed solid-liquid demixing occurred in the skin layer under the control of the thermodynamics of casting solutions, and the dense skin layer formed with spherical or dendritic crystals. The phase separation behaviors of the sublayers were controlled by the kinetic diffusion (DW-S/DS-W).

Compatibility of Polyvinylidene Difluorid/Polyurethane and Preparation of Composite Tubular Membrane

2014 ◽  
Vol 936 ◽  
pp. 212-217
Author(s):  
Dan Ying Zuo ◽  
Hong Jun Li ◽  
Chang Hai Yi ◽  
Hou Lei Gan
Keyword(s):  
Phase Inversion ◽  
Water Flux ◽  
Mixing Enthalpy ◽  
Inversion Method ◽  
Membrane Porosity ◽  
Phase Inversion Method ◽  
Tubular Membranes ◽  
Parameter Theory ◽  
Precipitation Phase ◽  
Liquid Liquid Phase Separation

The compatibility of polyvinylidene difluorid (PVDF) and polyurethane (PU), the thermodynamics of the PVDF/PU/DMF (N-N-Dimethylformamide) membrane-forming systems were studied, and the composite tubular membranes of PVDF/PU-PET knitted fabric tube were prepared by the immersion precipitation phase inversion method. The results showed that the PVDF/PU system was partly compatible by the measurements of the solubility parameter theory, the mixing enthalpy, the viscosity. With PU content increasing, the gelation values increased and the instantaneous liquid-liquid phase separation was preferred to occur. The water flux of the composite tubular membranes were enhanced from 1264.81 to 2165.35 L/m2.h with PU content increasing from 10wt% to 40wt%, which resulted from the an increment of the membrane porosity and the improvement of the hydrophilicity.

scholarly journals Design of a novel poly(aryl ether nitrile)-based composite ultrafiltration membrane with improved permeability and antifouling performance using zwitterionic modified nano-silica

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15231-15244
Author(s):  
Qi Wang ◽  
Fengna Dai ◽  
Shangying Zhang ◽  
Mengxia Wang ◽  
Chunhai Chen ◽  
...  
Keyword(s):  
Surface Modification ◽  
Phase Inversion ◽  
Ultrafiltration Membrane ◽  
Nanocomposite Membrane ◽  
Inorganic Filler ◽  
Inversion Method ◽  
Aryl Ether ◽  
Nano Silica ◽  
Phase Inversion Method ◽  
Precipitation Phase

Zwitterionic nano-silica (SiO2 NPs) obtained by lysine surface modification was used as a hydrophilic inorganic filler for preparing a poly(aryl ether nitrile) (PEN) nanocomposite membrane via an immersion precipitation phase inversion method.

Phase Inversion Tape Casting and Electrochemical Performance of Solid Oxide Fuel Cell Anode

2015 ◽  
Vol 30 (12) ◽  
pp. 1291
Author(s):  
ZHANG Yu-Yue ◽  
LIN Jie ◽  
MIAO Guo-Shuan ◽  
GAO Jian-Feng ◽  
CHEN Chu-Sheng ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cell ◽  
Phase Inversion ◽  
Tape Casting ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Cell Anode ◽  
Fuel Cell Anode

TEST-CASE NO 15: PHASE INVERSION IN A CLOSED BOX (PC)

2004 ◽  
Vol 16 (1-3) ◽  
pp. 101-104 ◽  
Author(s):  
S. Vincent ◽  
J.-P. Caltagirone ◽  
D. Jamet
Keyword(s):  
Phase Inversion ◽  
Test Case

Microporous Membranes from an Insoluble Polyimide

1995 ◽  
Vol 60 (10) ◽  
pp. 1741-1746
Author(s):  
Jan Schauer ◽  
Miroslav Marek
Keyword(s):  
Acetic Anhydride ◽  
Phase Inversion ◽  
Amic Acid ◽  
Microporous Membranes ◽  
Inversion Process ◽  
Phase Inversion Process ◽  
Ultrafiltration Process

Poly(amic acid) prepared from 3,3',4,4'-benzophenonetetracarboxylic dianhydride and bis(4-aminophenyl) ether was used for preparation of microporous membranes by the phase inversion process. Membranes coagulated in acetic anhydride were brittle but usable for ultrafiltration. Coagulation of the poly(amic acid) in water or lower alcohols and subsequent thermal cyclocondensation led to extremely brittle polyimides, which limits their use for ultrafiltration process.

Phase Inversion in Two-Phase Liquid Systems

1992 ◽  
Vol 57 (7) ◽  
pp. 1419-1423
Author(s):  
Jindřich Weiss
Keyword(s):  
Interfacial Tension ◽  
Phase Inversion ◽  
Continuous Phase ◽  
Considerable Effect ◽  
Weak Dependence ◽  
Dispersed Phase ◽  
Two Phase ◽  
Liquid Systems ◽  
Phase Liquid

New data on critical holdups of dispersed phase were measured at which the phase inversion took place. The systems studied differed in the ratio of phase viscosities and interfacial tension. A weak dependence was found of critical holdups on the impeller revolutions and on the material contactor; on the contrary, a considerable effect of viscosity was found out as far as the viscosity of continuous phase exceeded that of dispersed phase.

scholarly journals Production behavior evaluation on multilayer commingled stress-sensitive carbonate gas reservoir

2020 ◽  
pp. 014459872096415
Author(s):  
Jianlin Guo ◽  
Fankun Meng ◽  
Ailin Jia ◽  
Shuo Dong ◽  
Haijun Yan ◽  
...  
Keyword(s):  
Early Stage ◽  
Sedimentary Environment ◽  
Production Performance ◽  
Total Production ◽  
Inversion Algorithm ◽  
Gas Reservoir ◽  
Hole Pressure ◽  
Bottom Hole Pressure ◽  
Bottom Hole ◽  
Production Behavior

Influenced by the complex sedimentary environment, a well always penetrates multiple layers with different properties, which leads to the difficulty of analyzing the production behavior for each layer. Therefore, in this paper, a semi-analytical model to evaluate the production performance of each layer in a stress-sensitive multilayer carbonated gas reservoir is proposed. The flow of fluids in layers composed of matrix, fractures, and vugs can be described by triple-porosity/single permeability model, and the other layers could be characterized by single porosity media. The stress-sensitive exponents for different layers are determined by laboratory experiments and curve fitting, which are considered in pseudo-pressure and pseudo-time factor. Laplace transformation, Duhamel convolution, Stehfest inversion algorithm are used to solve the proposed model. Through the comparison with the classical solution, and the matching with real bottom-hole pressure data, the accuracy of the presented model is verified. A synthetic case which has two layers, where the first one is tight and the second one is full of fractures and vugs, is utilized to study the effects of stress-sensitive exponents, skin factors, formation radius and permeability for these two layers on production performance. The results demonstrate that the initial well production is mainly derived from high permeable layer, which causes that with the rise of formation permeability and radius, and the decrease of stress-sensitive exponents and skin factors, in the early stage, the bottom-hole pressure and the second layer production rate will increase. While the first layer contributes a lot to the total production in the later period, the well bottom-hole pressure is more influenced by the variation of formation and well condition parameters at the later stage. Compared with the second layer, the scales of formation permeability and skin factor for first layer have significant impacts on production behaviors.

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