Chandan Guria - Academia.edu (original) (raw)

Papers by Chandan Guria

Chemical Engineering Research & Design, Jul 1, 2016

Abstract In this study, polysulfone based mixed-matrix ultrafiltration membranes were prepared by... more Abstract In this study, polysulfone based mixed-matrix ultrafiltration membranes were prepared by blending polysulfone with different polymer-grafted bentonite additives. Formation of polymer-grafted bentonite was confirmed by Fourier transformed infra-red spectroscopy, energy-dispersive X-ray and thermal gravimetric analysis. Membranes were fabricated via wet phase inversion process with varying additive concentration. Hydrophilicity and structural changes of grafted polysulfone membranes were investigated by scanning electron microscope, water contact angle, molecular weight cut-off and pure water flux measurement. Prepared polysulfone/polymer grafted bentonite membrane was used for the separation of oil from oil-field oily wastewater and the membrane performance was evaluated in terms of permeate flux, oil rejection and fouling characteristics. Finally, results were compared with plain polysulfone and polysulfone/bentonite ultrafiltration membranes.

Information Sciences, Mar 1, 2017

Like elitism, parent inheritance plays an important role to decide the quality of offspring and i... more Like elitism, parent inheritance plays an important role to decide the quality of offspring and it is believed that the parents with high intelligence quotient (IQ) like to produce children with high IQ. Inspiring this concept, the improved pool of an initial random population involving the best set of chromosomes are incorporated in the framework of multi-objective optimization genetic algorithm. The effects of parent inheritance in the elitist non-dominated sorting genetic algorithm (called, i-NSGA-II) on the speed of convergence to the global Pareto-optimal front is compared with the binary coded NSGA-II using different benchmark multi-objective optimization problems. The parent inheritance is also incorporated in several jumping gene (JG) adapted NSGA-II algorithms. The efficacy of inheritance in NSGA-II and its several JG adaptations is tested by quantifying several indicators, namely, generational distance, spacing and hyper-volume ratio using different benchmark multi-objective optimization problems from the literature. The inclusion of the inheritance operator improves the speed of convergence to global Pareto-optimal front significantly with a minimum number of generations over existing NSGA-II and several JG adapted NSGA-II algorithms. The effectiveness of the proposed operator is further established by solving real-life robust multi-objective optimization problems involving the drilling of oil-well and synthesis of sal oil biodiesel.

Two mathematical models to describe the loading of ion-exchange resin beads following shell-core ... more Two mathematical models to describe the loading of ion-exchange resin beads following shell-core behaviour under finite bath conditions are developed. An analytical solution is obtained for the model based on a simplifying assumption of quasi-steady diffusion, while the model based on non-quasi-stationary diffusion is converted by finite integral transform to a system of first order differential equations, which are then solved by numerical means. The two models, tested with sorption data of aqueous sulphur dioxide on cross-linked poly(4-vinyl pyridine) resin (ReillexTMHP)(Reillex^{TM} HP)(ReillexTMHP) measured under finite bath conditions, yield comparable results (29 refs.)

Polymer, Jun 1, 2020

A mathematical model is developed to describe the phase inversion kinetics for the fabrication of... more A mathematical model is developed to describe the phase inversion kinetics for the fabrication of porous PVCbased polymeric membranes under finite coagulation bath condition. The model accounts for the non-quasistationary diffusion of non-solvent across the solidified membrane, time-variant non-solvent concentration in the coagulation bath and swelling of the membrane while phase inversion. An analytical solution is obtained for the pseudo-steady-state model, whereas the unsteady-state phase inversion model is converted by finite integral transform to a set of first-order coupled ordinary differential equations, which are solved by the numerical means. The above models are tested with the real-time movement of the solidification front using PVC/N-methyl pyrrolidine (NMP)-based casting solution involving Pluronic F127 and bentonite additives, and CaCl 2 , NaCl and KCl salt coagulation bath as well as demineralized water. The proposed pseudo-steady-state and unsteady phase inversion models predict diffusivity of the non-solvent through membrane matrix and the diffusivity follows the following order for a given casting solution: KCl > NaCl > CaCl 2 > water. The results reveal that the combined effect of Pluronic F127 and bentonite in PVC-NMP-based casting solution dominates over individual additives and it results from the higher non-solvent diffusivity with fast liquid-liquid demixing as well as the enhancement in membrane swelling.

Energy & Fuels, Dec 11, 2015

Fresh and recycled bentonite nanoclay was used as a basic catalyst for the optimal synthesis of s... more Fresh and recycled bentonite nanoclay was used as a basic catalyst for the optimal synthesis of sal oil methyl ester biodiesel at high temperature. Bulk and surface properties of fresh and recycled catalyst were determined to check the recyclability. A catalyst concentration dependent lumped-parameter kinetic model was proposed for the transesterification of sal oil, and a simple genetic algorithm was used to determine the rate constants. Proposed rate constants were able to predict the experimental conversion of sal oil accurately under varying catalyst and methanol concentrations. A multiobjective optimization problem involving conflicting objectives (i.e., minimization of transesterification time, and minimization of undesirable intermediates) was formulated and solved using a nondominated sorting genetic algorithm. The temperature trajectory over the entire transesterification period was considered as a decision variable to obtain the fixed conversion of sal oil. A set of nondominated optimal Pareto s...

Journal of Membrane Science, Oct 1, 2018

The low-cost PVC/bentonite ultrafiltration membranes are prepared by phase inversion method using... more The low-cost PVC/bentonite ultrafiltration membranes are prepared by phase inversion method using different coagulation baths involving de-mineralized water and aqueous saturated solution of NH 4 Cl, NaCl, KCl, MgCl 2 and CaCl 2. Effect of coagulation bath on membrane performance is investigated by evaluating ternary-phase diagram, membrane morphology, hydrophilicity, porosity, mean pore size, pore density, pure water flux and antifouling behavior using oilfield produced water. Better performing membrane with 5% bentonite loading is obtained from KClcoagulation bath with pure water permeance-467.5 L m-2 h-1 atm-1. Response surface method 2 based on central composite design is employed to enhance the ultrafiltration membrane performance using the optimum design of experiments through maximizing permeate flux as well as oil rejection separately considering following decision variables: PVC and bentonite loading in casting solution, membrane thickness, pH and trans-membrane pressure (TMP). The maximum permeation flux of 421.3 Lm-2 h-1 is achieved using PVC-loading-15.01 g, bentoniteloading-1.37 g, membrane thickness-100 µm, pH-9 and TMP-250 kPa, while maximum oil rejection is 98.6% at PVC-loading-18.0 g, bentonite-loading-0.0 g, membrane thickness-250 µm, pH-5.1 and TMP-54.4 kPa. Due to conflicting nature of permeation and oil rejection, a multiobjective optimization problem is formulated and solved using an elitist non-dominated sorting genetic algorithm (NSGA-II), resulting the Pareto-optimal solution.

Journal of water process engineering, Apr 1, 2020

Pluronic F127 blended polyvinyl chloride (PVC) ultrafiltration (UF) membranes using different loa... more Pluronic F127 blended polyvinyl chloride (PVC) ultrafiltration (UF) membranes using different loading of inorganic salts (like NaCl, KCl, NH 4 Cl, MgCl 2 and CaCl 2) in casting solution involving N-methyl-pyrrolidone solvent are prepared for the cleaning of oilfield produced water with 200 ppm oil concentration. The effect of salt loading in casting solution on the performance of blended PVC membranes is studied by determining the thermodynamic and kinetic effect, membrane hydrophilicity, morphology, pure water flux, oilfield produced water permeate flux, oil rejection and fouling resistance ability. A better performing membrane is obtained using KCl in polymer casting solution involving PVC-14.0 (g), NMP-80.0 (g), Pluronic F127-5.0 (g) and KCl-1.0 (g) with enhanced (i) pure water flux (i.e., 607.8 L m −2 h-1), (ii) produced water permeate flux (i.e., 265.7 L m −2 h-1) and (iii) oil rejection (> 92.8 %) with higher fouling resistance (i.e., flux recover ratio > 71.65 %) when trans membrane pressure is kept at 100 kPa, compared to PVC UF membranes involving CaCl 2 , MgCl 2 , NaCl and NH 4 Cl salts in casting solution. The addition of bentonite nanoclay in Pluronic F127 and KCl-induced PVC casting solution has a significant impact to improve the UF performance and results super-hydrophilic membrane with water contact angle < 10°. An enhancement in pure water and oilfield produced water permeate flux by 42.25 % and 37.61 %, respectively, with oil rejection > 92.0 % is obtained over UF membrane without bentonite.

Brazilian Journal of Chemical Engineering, Apr 1, 2017

The present paper deals with the ultrafiltration (UF) of produced water using a polysulfone membr... more The present paper deals with the ultrafiltration (UF) of produced water using a polysulfone membrane. Membranes were prepared by the phase inversion technique using polysulfone (PSf) polymer base, poly vinyl pyrrolidone (PVP) additive and N-methyl-2-pyrrolidone (NMP) solvent. Prepared UF membranes were characterized by determining the surface morphology by scannaing electron microscopy (SEM), atomic force microscopy (AFM), porosity, (iii) water contact angle, equilibrium water content and pure water flux, whereas membrane performance was determined by measuring permeate flux and oil rejection using oily synthetic produced water. With the increase in trans-membrane pressure in the cell, the permeate flux increased significantly, but oil rejection showed a decreasing trend. The best UF membrane performance under different trans-membrane pressures was obtained by maintaining ≥90% oil rejection using an UF membrane with the following composition: PSf-15%, PVP-5% and NMP-80%.

Chemical Engineering Research & Design, May 1, 2018

Abstract The present study deals with the improvement of surface morphology, hydrophilicity and a... more Abstract The present study deals with the improvement of surface morphology, hydrophilicity and antifouling behavior of polyvinyl chloride (PVC) membrane by adding bentonite for ultrafiltration of oil-in-water emulsion under wide range of salinity (0–35000 ppm). Flat-sheet UF membranes were prepared by phase inversion technique using N, N-dimethylacetamide (DMAc) and water. Viscoelastic properties of the membrane casting solution were measured to fix sonication frequency, membrane casting speed and casting solution composition. Field-emission-scanning-electron-microscope and atomic-force-microscope were used to measure surface-porosity, pore-size distribution, pore density and roughness parameters of the membranes. Hydrophilicity of the membranes was determined by measuring equilibrium water content, contact angle and work of adhesion, whereas antifouling character was quantified by flux recovery ratio using saline oily-wastewater. Casting solution with PVC:DMAc:bentonite = 12.0:87.23:0.77 (i.e., PVC/bentonite-6) exhibited the maximum loss tangent and in-phase dynamic viscosity and resulted enhanced surface porosity (56.42–58.62%), root mean square surface roughness (127.6 nm), surface pore density (42.29–32.05 pores μm−2), hydrophilicity (work-of-adhesion:111.08 mN m−1) and antifouling character (flux-recovery-ratio:81.97%). PVC/bentonite-6 also delivered improved performance to separate oily-wastewater with zero salinity (oil rejection: 97.0% and permeate flux: 186 L m−2 h−1) and 35000 ppm salinity (oil rejection: 92.5% and permeate flux: 94nL m−2 h−1) at 0.2 MPa trans-membrane pressure.

Separation and Purification Technology, Aug 1, 2015

Abstract The present paper deals with the performance studies of newly formulated polysulfone–ben... more Abstract The present paper deals with the performance studies of newly formulated polysulfone–bentonite ultra-filtration membrane for the purification of oily produced water and the results were compared with standard polysulfone–silica membrane. Membranes were prepared via phase inversion technique by blending silica and bentonite nanoparticles separately with polysulfone and N-methyl-2-pyrrolidone solution. Particle size distribution, specific surface area, morphology, FTIR, elemental analysis and cation exchange capacity of silica and bentonite nanoparticles were determined. Viscoelastic properties of membrane casting solution were measured to determine the maximum applied strain (i.e., ⩽70 s−1) to avoid structural degradation while casting. The surface morphology of membranes was analyzed by field emission scanning electron microscopy and atomic force microscope. Porosity, contact angle and equilibrium water content of individual membrane was also determined. The membranes were subjected to ultra-filtration characterization such as compaction factor, hydraulic permeability, pure water flux, percent oil rejection and molecular weight cut-off for performance studies. Finally, membrane performance of silica and bentonite blended polysulfone membranes was compared by measuring permeate flux, flux declination rate and oil rejection. An improved performance of polysulfone–bentonite membranes was obtained for desired percent rejection over polysulfone–silica membrane.

Macromolecular Theory and Simulations, Jul 19, 2005

Journal of Industrial and Engineering Chemistry, Oct 1, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Chemical engineering research & design, Feb 1, 2023

Geosystem Engineering, May 2, 2023

Journal of Petroleum Science and Engineering, Oct 1, 2022

Journal of Applied Polymer Science, Sep 1, 2011

For identification and quantification of desired and undesired products during epoxy resin format... more For identification and quantification of desired and undesired products during epoxy resin formation, polymerization of bisphenol-A with the stoichiometric excess of epichlorohydrin is carried out using catalytic excess of alkali. The reaction is monitored using Fourier transform infra-red (FT-IR) spectroscopy technique. Major undesired products are unreacted monomers (bisphenol-A and epichlorohydrin) and byproducts (chlorine and a-glycol substituted diglycidal ether of bisphenol-A), whereas the desired product is only diglycidal ether of bisphenol-A. Molar concentrations of epichlorohydrin, bisphenol-A, diglycidal ether of bisphenol-A, chlorine substituted resin, and a-glycol substituted resin in the polymerization mixture are analyzed and quantified using FT-IR characteristic frequency bands at 925, 3448, 1344, 773, and 3641 cm À1 , respectively. For optimal determination of process parameters on polymerization, effect of temperature and alkali loading on epoxy polymerization is carried to maximize the yield of diglycidal ether of bisphenol-A with simultaneous minimizing the byproducts formation. V

Journal of Petroleum Science and Engineering, May 1, 2013

In this study, Marsh Funnel is used to determine the rheological properties, namely, yield point,... more In this study, Marsh Funnel is used to determine the rheological properties, namely, yield point, apparent viscosity and plastic viscosity of drilling fluid. Funnel drainage volume and corresponding drainage time are two measured variables for this analysis. Drainage volume is used to predict funnel wall shear stress whereas drainage rate is used to estimate funnel wall shear rate. The predicted shear rate is independent of rheological models. Yield point is calculated from remaining volume of fluid in the funnel at the end of the experiment under no flow condition whereas apparent viscosity and plastic viscosity are determined from the funnel consistency plot. Synthetic crude oil and the suspension of several drilling fluid additives (e.g., bentonite, polyethylene glycol-sodium chloride and polyethylene glycol-sodium chloride-bentonite) with practical importance have also been used to determine yield point, apparent viscosity and plastic viscosity using the Marsh Funnel readings. Finally, the Marsh Funnel rheological results are also compared with the Fann 35 viscometer results.

Materials Chemistry and Physics, Mar 1, 2022