Pervaporation performance of PPO membranes in dehydration of highly hazardous mmh and udmh liquid propellants

Moulik, Siddhartha; Kumar, K. Praveen; Bohra, Subha; Sridhar, S.

doi:10.1016/j.jhazmat.2015.02.020

Cited by 37 publications

(9 citation statements)

References 22 publications

(26 reference statements)

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“…Moraveji et al 2013 [15] modeled a pervaporation process with polydimethylsiloxane (PDMS) membrane for dehydration of ethanol. In our earlier studies, a combined model based on molecular modelling and CFD has been reported for the dehydration of liquid propellants [16] and n-Methyl-2-pyrrolidone [2].…”

Section: Introductionmentioning

confidence: 99%

Pervaporation separation of acetic acid/water mixtures through sodium alginate/polyaniline polyion complex membrane

Moulik

Nazia

Vani

et al. 2016

Separation and Purification Technology

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Section: Introductionmentioning

confidence: 99%

Pervaporation separation of acetic acid/water mixtures through sodium alginate/polyaniline polyion complex membrane

Moulik

Nazia

Vani

et al. 2016

Separation and Purification Technology

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“…The mobility of water and Na + within the polyamide membrane was investigated using the mean square displacement (MSD), calculated by using eq. ():

MSD = {| r_{i} (t) - r_{i} (0) |}^{2}

where r i (0) and

r_{i} (t)

are the initial and final coordinates of atom i , respectively. The diffusion coefficient ( D ) of the molecules was calculated from the slope of the MSD graphs using the Einstein relationship:

D = \lim_{t \to \infty} \frac{{| r_{i} (t) - r_{i} (0) |}^{2}}{6 t}

…”

Section: Methodsmentioning

confidence: 99%

Forward‐osmosis‐aided concentration of fructose sugar through hydrophilized polyamide membrane: Molecular modeling and economic estimation

Madhumala

Moulik

Sankarshana

et al. 2016

J of Applied Polymer Sci

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In this study, a thin-film composite membrane based on hydrophilized polyamide was synthesized for the concentration of an aqueous fructose solution using a forward-osmosis (FO) technique. The membrane was prepared by the addition of excess mphenylenediamine along with a small quantity of dipolar aprotic dimethyl sulfoxide solvent in the aqueous reaction bath followed by excess trimesoyl chloride in an organic bath with a longer time provided for interfacial polymerization to minimize fructose losses. The effect of operating parameters such as draw NaCl concentration, cross-flow velocity, and temperature on FO performance was evaluated. Membrane characterization was performed using scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction to study the physicochemical properties. A coupled model based on molecular modeling and computational fluid dynamics was developed to study the diffusion behavior and concentration profiles of the two solutions within the process. A detailed economic estimation for the production of crystalline fructose sugar is presented. The study reveals the significant potential of FO as an economical process for concentration of sugar solutions using brine as the draw solution. V C 2016 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2017, 134, 44649.

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“…Finite element method (FEM) is applied by this software to solve conservation equations numerically. Previous simulations of membrane separation processes using FEM showed that this method was an accurate, valid and powerful technique for solving mass and momentum equations [23,25,29]. The computational time for solving the equations was about 2 minutes.…”

Section: Numerical Solution Of the Conservation Equationsmentioning

confidence: 99%

“…This produces a complex morphology and transport situation. Extensive studies have been conducted for mass transfer modeling of PV systems [23][24][25][26][27][28][29][30]. Recently Rezakazemi et al (2011) proposed a model for PV separation of water/ethylene glycol solution based on solving equations of mass and momentum conservation (Navier-Stokes equations) with Finite Element Method (FEM) [25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Evaluation, Modeling and Simulation of Nano-Pore Naa Zeolite Membranes

Mansoor¹,

Zahra²

2017

IJASE

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Zeolite membranes have uniform and molecular-sized pores that separate molecules based on the differences in the molecules' adsorption and diffusion properties. Strong electrostatic interaction between ionic sites and water molecules (due to its highly polar nature) makes the zeolite NaA membrane very hydrophilic. Zeolite NaA membranes are thus well suited for the separation of liquid-phase mixtures by pervaporation. In this study, experiments were conducted with various Ethanol-water mixtures (1-20 wt. %) at 25 °C. Total flux for Ethanol-water mixtures was found to vary from 0.331 to 0.229 kg/m 2 .h with increasing Ethanol concentration from 1 to 20 wt.%. Ionic sites of the NaA zeolite matrix play a very important role in water transport through the membrane. These sites act both as water sorption and transport sites. Surface diffusion of water occurs in an activated fashion through these sites. The precise Nano-porous structure of the zeolite cage helps in a partial molecular sieving of the large solvent molecules leading to high separation factors. A comparison between experimental flux and calculated flux using Stephan Maxwell (S.M.) correlation was made and a linear trend was found to exist for water flux through the membrane with Ethanol concentration. A comprehensive model also was proposed for the Ethanol/water pervaporation (PV) by Finite Element Method (FEM). The 2D model was masterfully capable of predicting water concentration distribution within both the membrane and the feed side of the pervaporation membrane module.

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Pervaporation performance of PPO membranes in dehydration of highly hazardous mmh and udmh liquid propellants

Cited by 37 publications

References 22 publications

Pervaporation separation of acetic acid/water mixtures through sodium alginate/polyaniline polyion complex membrane

Pervaporation separation of acetic acid/water mixtures through sodium alginate/polyaniline polyion complex membrane

Forward‐osmosis‐aided concentration of fructose sugar through hydrophilized polyamide membrane: Molecular modeling and economic estimation

Synthesis, Evaluation, Modeling and Simulation of Nano-Pore Naa Zeolite Membranes

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