Dr. Aparna K

About Dr. Aparna K

Dr. Aparna K, With an exceptional h-index of 12 and a recent h-index of 12 (since 2020), a distinguished researcher at National Institute of Technology, Calicut, specializes in the field of biofuels, biodiesel from biomass, catalysis.

His recent articles reflect a diverse array of research interests and contributions to the field:

INTERNAL MODEL CONTROL OF CUMENE PROCESS USING ANALYTICAL RULES AND EVOLUTIONARY COMPUTATION: Original scientific paper

Investigation on thermochemical characteristics and pyrolysis kinetics of lignocellulosic biomass for biofuel production feasibility

Template assisted sol-gel synthesis of BiFeO3 hollow tubes: Introducing kapok fiber as a bio-template.

TiO2/Graphitic carbon nitride Z-scheme catalyst for binary dye degradation by persulphate activation

Robust control of isopropyl benzene production process using H∞ loop shaping control scheme

Non-isothermal One-Dimensional Two-Phase Model of Water Transport in Proton Exchange Membrane Fuel Cells with Micro-porous Layer

Real-Coded Genetic Algorithm for Fixed Structure PID Controller Tuning in Sodium Chlorate Process

Methyl orange dye adsorbed biochar as a potential Brønsted acid catalyst for microwave-assisted biodiesel production

Dr. Aparna K Information

University

National Institute of Technology, Calicut

Position

Department of Chemical Engineering

Citations(all)

567

Citations(since 2020)

470

Cited By

207

hIndex(all)

12

hIndex(since 2020)

12

i10Index(all)

13

i10Index(since 2020)

13

Email

University Profile Page

National Institute of Technology, Calicut

Dr. Aparna K Skills & Research Interests

biofuels

biodiesel from biomass

catalysis

Top articles of Dr. Aparna K

INTERNAL MODEL CONTROL OF CUMENE PROCESS USING ANALYTICAL RULES AND EVOLUTIONARY COMPUTATION: Original scientific paper

Authors

Vinila Mundakkal Lakshmanan,Aparna Kallingal,Sreepriya Sreekumar

Journal

Chemical Industry & Chemical Engineering Quarterly

Published Date

2024

Cumene is a precursor for producing many organic chemicals and is thinner in paints and lacquers. Its production process involves one of the large-scale manufacturing processes with complex kinetics. Different classical control strategies have been implemented and compared in this process for the cumene reactor. As a system with large degrees of freedom, a novel approach for extracting the state space model from the COMSOL Multiphysics implementation of the system is adopted here. Internal Modern Control (IMC) based PI and PID controllers are derived for the system. The system is reduced to the FOPDT and SOPDT model structure to derive the controller setting using Skogestad half rules. The integral time is modified for excellent set point tracking and faster disturbance rejection. From the analysis, it can be stated that the PI controller suits more for this specific process. The particle swarm optimization (PSO) algorithm, an evolutionary computation technique, is also used to tune the PI settings. The PI controllers with IMC, Zeigler Nichols, and PSO tuning are compared, and it can be concluded that the PSO PI controller settles at 45 s without any oscillations and settles down faster for the disturbance of magnitude 0.5 applied at t= 800 s. However, it is computationally intensive compared to other controller strategies.

Investigation on thermochemical characteristics and pyrolysis kinetics of lignocellulosic biomass for biofuel production feasibility

Authors

GS Vanisree,Akash M Chandran,K Aparna

Journal

Biomass Conversion and Biorefinery

Published Date

2024/4/26

Sustainable technologies provide a route to address future energy needs by converting lignocellulosic biomass into fuels, eco-friendly substances, and chemicals. These advancements hold promise as substitutes for fossil fuels while maintaining a carbon–neutral footprint. The current research is centered around investigating the potential of biomass waste betel nut inflorescence (BNI), red lucky nut seed pod (RLP), and Cycas circinalis seed shell (CSS) for producing biofuels through thorough physiochemical analysis. Various methods were used to characterize the selected biomass waste, including proximate and ultimate analysis, TGA, FTIR spectroscopy, and XRD. Among the studied biomass types, the CSS biomass exhibited the highest calorific value, 16.36 MJ/kg. Lowest value is reported 13.50 MJ/kg for BNI. Alcoholic and phenolic functional groups, along with alkanes, alkenes, and certain aromatic …

Template assisted sol-gel synthesis of BiFeO3 hollow tubes: Introducing kapok fiber as a bio-template.

Authors

Manjusha Eledath,Shalini Viswanathan,Aparna Kallingal,Maneesh Chandran

Journal

Materials Today Communications

Published Date

2024/4/12

Bismuth ferrite (BiFeO3) is a perovskite material well known for its multifunctional properties and related applications. The recent research on this material includes the synthesis of hollow-structured BiFeO3 using various methods and exploring their applications in photocatalysis and sensing. Here, we introduce a facile method for the synthesis of BiFeO3 hollow tubes using the sol-gel method, where kapok fiber collected from Ceiba Pentandra is used as a biotemplate for the first time. In the procedure, the annealing path was modified by introducing intermediate holding steps besides varying the final annealing temperature. The structural analysis was carried out using x-ray diffraction (XRD) and Raman analysis, whereas the formation of hollow tube morphology was confirmed with the help of FESEM analysis. The complete decomposition of the kapok fiber template during the annealing process was confirmed with …

TiO2/Graphitic carbon nitride Z-scheme catalyst for binary dye degradation by persulphate activation

Authors

Shalini Viswanathan,Anooj Anil Pallikkara,Fermil Muhammed,Majji Kavya Sri,K Aparna

Journal

IOP Conference Series: Materials Science and Engineering

Published Date

2024/4/1

In this work, we describe the preparation of the TiO 2 (P25)/Graphitic Carbon Nitride composite and the degradation of pollutants using this composite with persulphate activation. The materials are characterized by XRD, FTIR analysis, etc. XRD analysis confirms the presence of TiO 2 anatase and GCN and the characteristic functional groups of both TiO 2 and GCN are determined with the help of FTIR. The degradation of crystal violet and Rhodamine B in binary mixtures over this synthesized catalyst is easier than individual catalysts separately. The degradation efficiency of crystal violet over TiO 2/GCN composite is 1.5 times higher than GCN and 3 times higher than TiO 2 alone and the degradation efficiency of Rhodamine B over TiO 2/GCN composite is 1.1 times higher than GCN and 2.4 times higher than TiO 2 alone. In flat band analysis, a Z-Scheme catalyst is formed between TiO 2 and GCN. The electron …

Robust control of isopropyl benzene production process using H∞ loop shaping control scheme

Authors

Vinila Mundakkal Lakshmanan,Aparna Kallingal,Sreepriya Sreekumar

Journal

Journal of Control and Decision

Published Date

2024/1/2

This paper discusses robust control strategy for isopropyl benzene production process using the method of loop shaping technology. This cumene production process is a part of phenol plant in HOCL, Kochi. control of the propylene concentration is done here. The controller is derived from the linearised model of the reactor. The optimal controller is obtained by simplifying two algebraic Riccati equations. The proposed PID-like controller provides a single tuning parameter which makes the controller design more accurate. The proposed controller has been compared with other robust controllers like and LQR. The controller is found to be superior in a wide frequency range and has a feature of low distortion and good regulating performance. The reactor model has been developed in COMSOL Multiphysics with the parameters obtained from HOCL plant, Kochi. The model extracted is …

Non-isothermal One-Dimensional Two-Phase Model of Water Transport in Proton Exchange Membrane Fuel Cells with Micro-porous Layer

Authors

Kavya Vanaja Raghunath,Bapathi Kesavananda Reddy,Shaneeth Muliankeezhil,K Aparna

Journal

Arabian Journal for Science and Engineering

Published Date

2023/7

In a polymer electrolyte membrane fuel cell, managing the water content is crucial in determining the fuel cell's performance stability. The micro-porous layer is located at the interface between catalyst layer and gas diffusion layer of PEMFC. Water transport in fuel cell is improved on using micro-porous layer. This paper outlines a two-phase model for proton exchange membrane fuel cells with micro-porous layer. The model is one-dimensional, steady-state and non-isothermal. Membrane water transport is given significant attention in the modeling process. The suggested one-dimensional model predicts the influence of current density and water transport in PEMFC realistically well. Modeling is done using MATLAB/SIMULINK and the predictions are compared to the experimental performance characteristics of fuel cell. We have devised an easy to implement model which forecasts the most appropriate parameter …

Real-Coded Genetic Algorithm for Fixed Structure PID Controller Tuning in Sodium Chlorate Process

Authors

S Sreepriya,Aparna Kallingal,ML Vinila

Published Date

2023/4/8

Sodium chlorate manufacture is among the most energy-intensive industrial electrochemical processes. Industrial manufacture of sodium chlorate crystals will be energy efficient only if the pH of the reactor bulk is controlled. If pH is not within the specific limits, the cell efficiency drops to as low as 66%. This article proposes a fixed structure PID controller for pH in the cell bulk. The fixed structure controller is a solution to issues faced in industrial controller design, such as model uncertainties, nonlinearities, and disturbances. However, a fixed structure controller design results in an optimization problem characterized by multimodality, conflicting constraints, ample pursuit space, and expensive cost function. Traditional optimization methods are inappropriate since a feasible solution set must be computed. Soft computing methods like evolutionary algorithms can handle this problem. This paper attempts to design a …

Methyl orange dye adsorbed biochar as a potential Brønsted acid catalyst for microwave-assisted biodiesel production

Authors

Suchith Chellappan,Aparna Kallingal,Sajith Vandana,Vaishakh Nair,Chingakham Chinglenthoiba

Journal

Environmental Science and Pollution Research

Published Date

2023/12

Biodiesel production from non-edible oils utilizing a highly efficient eco-friendly catalyst is a crucial necessity for replacing fossil fuels. In the present work, biochar has been applied for both energy and environmental purposes. The biochar was made by slow pyrolysis from a variety of biomass, primarily cassava peel, irul wood sawdust, and coconut shell. All biochars were used as adsorbents to remove an anionic dye (methyl orange) by conducting batch adsorption studies. The biochar made from cassava peels showed the highest dye adsorption, and it was characterized using elements analysis (CHNS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area analyzer (BET), total acid density, and sulfonic acid group density to successfully confirm the presence of weak (–OH) and strong (–COOH, –SO3H …

Optimum Design of Cumene Reactor Using COMSOL Multiphysics Modelling

Authors

Vinila Mundakkal Lakshmanan,Aparna Kallingal,Sreepriya Sreekumar

Published Date

2023/4/8

COMSOL Multiphysics design of cumene reactor is done for the energy efficient modelling. Cumene manufacturing is an intermediate process during the production of phenol and acetone. The model incorporates the reaction kinetics, and the parameters are derived from the research plant. The system is designed as a packed bed reactor with four packed beds with defined boundary conditions. TDS interface of COMSOL is used to add the transport qualities, and the transport mechanism is convection. The system's performance is evaluated in order to improve efficiency and throughput. The concentration distribution in the fluid along the length of the reactor is one of the investigation's findings. The reactor implemented is analysed for variations in different parameters of the system. The particle porosity and catalytic particle size have been analysed. The analysis suggests that for a variation in the catalytic particle …

Graphitic carbon nitride–adorned PDMS self-cleaning floating photocatalyst for simultaneous removal of Rhodamine B, Crystal Violet and Malachite Green from a ternary dye mixture

Authors

Shalini Viswanathan,Joel Biju,Aparna Kallingal

Journal

Environmental Science and Pollution Research

Published Date

2023/11

Graphitic carbon nitride–adorned polydimethylsiloxane (PDMS) floating catalyst was prepared by a simple procedure. The prepared catalyst was utilized for the simultaneous mitigation of recalcitrant organic pollutants such as Rhodamine B, Crystal Violet and Malachite Green from their ternary mixture for the first time. Derivative spectroscopic method was used to calculate the degradation efficiencies of individual dyes in the mixture. The prepared catalyst showed a consistent degradation performance up to 4 cycles inducing a degradation of 94.02%, 92.1% and 97.13% of Rhodamine B, Crystal Violet and Malachite Green, respectively, in a dye(s) solution with a catalytic loading of 0.5 g L−1. A kinetic analysis of the dye(s) degradation under visible light was carried out during the course of this work up to 120 min. A detailed characterization of the surface of this novel catalyst was carried out in this study by SEM, EDX …

BiFeO3-PDMS hybrids: Development of visible-active floating photocatalysts with minimal catalyst loading

Authors

Manjusha Eledath,Shalini Viswanathan,Aparna Kallingal,Maneesh Chandran

Journal

The Journal of Chemical Physics

Published Date

2023/8/7

Recent advances in photocatalysis include the development of floating catalysts since they assure efficient and rapid recollection of the catalysts from the purified liquid, besides enhancing the availability of photons at the catalytic surface. Bismuth ferrite (BiFeO3 and BFO) is a multifunctional perovskite material renowned for its excellent photocatalytic properties. Since bandgap of BFO falls in the visible spectrum, BFO nanoparticles could be combined with a suitable floating substrate to develop efficient visible light photocatalysts. Here, we report the synthesis of BFO–polydimethylsiloxane (PDMS) hybrids for photocatalytic applications, where sol-gel–synthesized BFO nanoparticles are immobilized on a floating porous PDMS sponge. The successful incorporation of the nanoparticles on PDMS is confirmed using Raman spectroscopy, scanning electron microscopy, and energy dispersive x-ray spectroscopy. The …

Ti–N–C Bonded Close‐Coupled TiO2/g‐C3N4 for Rapid Degradation of Cationic Dyes from a Multi‐Dye System by Persulfate Activation

Authors

Viswanathan Shalini,Muraleedharan Dhanashyam,Meleppurakkal Dipinkrishna,Geetha Sivan Vanisree,Viswam Abhiram Vishnu,Pazhayikalarikkal Santhosh Sooraj,Kallingal Aparna

Journal

Chemical Engineering & Technology

Published Date

2023/8

A novel Z‐Scheme photocatalyst (TCN) was prepared with TiO2 and graphitic carbon nitride (GCN) and utilized to study the degradation efficiency of a binary dye mixture consisting of 5 ppm Rhodamine B (RhB) and 5 ppm Crystal Violet (CV) solutions by persulfate activation. Derivative spectrometric analysis was adopted to find the degradation efficiencies of the individual dyes in the mixture. The results indicate that in the presence of persulfate ions 0.6 TCN gives 100 % degradation in 60 min and 30 min for Rh B and CV, respectively. Hydroxyl radicals, superoxide radicals, and sulfate radicals were found to be the active species involved in photocatalytic degradation. From the results of radical scavenging experiments and band potentials of the semiconductors, a plausible mechanism of photocatalytic degradation of the model pollutants is proposed.

Thermochemical Characterization of Cycas Circinalis Seed Shell to Evaluate their Potential as Biofuel Source

Authors

GS Vanisree,K Aparna

Journal

IOP Conference Series: Materials Science and Engineering

Published Date

2022/3/1

Increased environmental pollution anxieties and quest for high energy demand from renewable energy sources forced to use lignocellulosic biomass to produce Bio-fuels. Cycas circinalis seed shell is a plant-derived bio-waste readily available in the southern coastal part of India. This research aims to explore the thermochemical characteristic of Cycas circinalis seed shells. Substantial volume reduction of feedstock and low processing time makes the thermal conversion route more attractive than any other method of waste to energy conversion. Biomass degradation behavior is studied by Thermogravimetric and derivative thermogravimetric analysis (TGA and DTG); this depicts biomass degradation in three primary stages, each corresponding to the decomposition of hemicellulose, cellulose, and lignin components. Functional groups were determined by Fourier transform infrared (FTIR) spectroscopy. The …

Production of Biodiesel From Cashew Nut Shell Liquid Using Cashew Nut Shell Derived Bio-char Catalyst

Authors

Vanisree Geetha Sivan,Ansuya Paleri,Aparna Kallingal

Published Date

2022/2/3

Biodiesel has recently received widespread attention as an essential source of renewable and environmentally friendly energy due to its ease of production and clean burning. Cashew nutshell is a biomass waste readily available in India. This work studies the production of fatty acid methyl ester (FAME) from the cashew nut shell liquid (CNSL) using sulfonated cashew nutshell biochar catalyst by transesterification reaction. Catalyst efficiency is compared with a conventional catalyst for biodiesel production. Characterization of the catalyst was done using FTIR, TGA, elemental analysis, and BET. Transesterification studies were carried out using KOH and the biochar catalyst. These studies inferred that the highest conversion of CNSL to FAME is achieved by using the conventional catalyst KOH (94.2% yield) and process parameters of 65 0 C reaction temperature, 1hr reaction time, 18: 1 methanol to oil ratio, and 5 w/w% catalyst weight. The highest conversion achieved using the biochar catalyst was 43.4% at optimum process parameters. The study revealed the feasibility of producing FAME from waste biomass, which lowers production costs and benefits environmental sustainability.

Comparative study of different modelling strategies for the dynamic design of cumene reactor in cumene production process

Authors

Vinila Mundakkal Lakshmanan,Aparna Kallingal,Sreepriya Sreekumar

Journal

Journal of the Indian Chemical Society

Published Date

2022/11/1

Cumene production is an important intermediate process for the production of phenol and acetone. This paper discusses different modelling strategies to solve the mathematical model of cumene reactor. Five different strategies have been utilised for solving the Partial Differential Equations obtained during the reduction of mathematical model. The schemes include dynamic modelling using Finite Difference Method in OpenModelica, pde solver, FDM in Simulink, MATmol and Orthogonal Collocation Method. A comparative study of the schemes with plant data has been done and it is observed that Orthogonal Collocation Method gives a good agreement with plant data compared to other strategies.

Modelling and performance analysis for cumene production process in a four-layer packed bed reactor

Authors

Vinila Mundakkal Lakshmanan,Aparna Kallingal,Sreepriya Sreekumar

Journal

International Journal of Chemical Reactor Engineering

Published Date

2022/8/26

A mathematical model is developed and designed for the cumene reactor in cumene production process in Hindustan Organic Chemicals Limited (HOCL), Kochi with improved operating conditions. High purity cumene is produced by the alkylation of benzene with propylene in this catalytic condensation process where solid phosphoric acid (SPA) is used as the catalyst. The mathematical model has been derived from mass and energy balance equations considering the reactor as fixed packed bed reactor and two different numerical methods are presented here to solve the modelling equations. The explicit finite difference method (FDM) involves the approximation of derivatives into finite differences, and in the other one, orthogonal collocation (OC), Ordinary Diffeential Equations (ODEs) are formed at the collocation points and are solved using Runge–Kutta fourth order numerical scheme. Here the analysis shows …

Adaptive neuro-fuzzy approach to sodium chlorate cell modeling to predict cell pH for energy-efficient chlorate production

Authors

Sreepriya Sreekumar,Aparna Kallingal,Vinila Mundakkal Lakshmanan

Journal

Chemical Engineering Communications

Published Date

2021/2/1

Sodium chlorate production is a highly energy-intensive electro-chemical process. The current efficiency is as low as 66.66% if the pH of the process is not controlled. Hence for energy-efficient sodium chlorate production, it is very important to predict the pH of the cell electrolyte. Though the analytical model of the chlorate cell is available, they are not suitable for pH prediction, as it requires a large number of parameters, which are not easily measurable. This study presents an adaptive neuro-fuzzy inference system model for predicting the pH of sodium chlorate cell from real plant data. This model uses fewer and easily measurable parameters for modeling such as flow rates of brine, HCl, NaOH, cell electrolyte temperature, DC load current, and pH of feed input. An analysis of the accuracy of six models with different combinations of these input parameters is conducted with different model settings for the type of …

Physiochemical characterization and thermal kinetics of lignin recovered from sustainable agrowaste for bioenergy applications

Authors

Gazliya Nazimudheen,Nimmi C Sekhar,Anju Sunny,Aparna Kallingal,B Hasanath

Journal

International Journal of Hydrogen Energy

Published Date

2021/1/22

In this study, lignin, one of the commonly occurring natural polymers, is extracted from banana agro-waste. Lignin is recovered from the spent liquor produced during alkaline pre-treatment of agro-waste and precipitated by acidification. This study focuses on the physio-chemical characterization and thermal degradation behaviour of lignin extracted from agro-waste biomass. The extracted lignin yield accounts for nearly 12% of the biomass composition. Spectral analysis, FTIR and NMR explain purity and carbon skeleton characteristics of herbaceous lignin monomers, majorly G and S units. Morphological analysis by SEM showed hollow spherical structures with large surface area for the extracted lignin. The calorific value of extracted lignin was experimentally found to be 21.4276 MJ/kg, which suggests the possible use of extracted lignin as an alternative to sub-bituminous coal. Thermal studies of lignin showed …

Photocatalytic degradation of azo and anthraquinone dye using TiO2/MgO nanocomposite immobilized chitosan hydrogels

Authors

Dhanya Arikal,Aparna Kallingal

Journal

Environmental Technology

Published Date

2021/7/3

Textile dyes are very toxic to human beings and environment. TiO2 nanoparticles have been of great interest in treating the organic effluent dyes. While using TiO2 nanoparticles, there is the electron-hole recombination, which decreases the degradation efficiency of photocatalyst. MgO nanoparticle, when used along with TiO2, forming TiO2/MgO nanocomposite act as a barrier for electron-hole recombination. Here, TiO2/MgO nanocomposites have been immobilized in chitosan beads, where chitosan acts as a support for the nanocomposite. The photocatalysts have been characterized by scanning electron microscope, ultraviolet (UV), X-ray diffraction and Fourier transform infrared spectroscopy. Methyl orange (MO) and Alizarin Red S (ARS) were used as model dye compounds. For MO, the experimental data have a better fit with Langmuir adsorption model and for ARS, it has a better fit with Freundlich adsorption …

Transient response modeling of reactant concentration in polymer electrolyte membrane fuel cells during load change

Authors

Kavya Vanaja Raghunath,Shaneeth Muliankeezhu,Aparna Kallingal

Journal

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects

Published Date

2021/6/18

This paper outlines a semi-empirical model to account for the transient response of Polymer Electrolyte Membrane Fuel Cells (PEMFC) during load changes. In this work, we investigated the voltage undershoots of the PEMFC system with a current step-up given as the input. The dynamic response of PEMFC during stepwise load changes is a vital factor that indicates cell performance. We present a model based on mass balance equations, various transport phenomena, and experimental conditions for these voltage undershoots. This model’s response highlights the impact of reactant starvation inside the fuel cell stack during step increase in current. A single fuel cell is divided into two domains to analyze the availability of reactant gases. The model can anticipate the impact of different operating conditions on the magnitude of voltage undershoots. Validation of the model with experimental data resulted in a …

See List of Professors in Dr. Aparna K University(National Institute of Technology, Calicut)

Dr. Aparna K FAQs

What is Dr. Aparna K's h-index at National Institute of Technology, Calicut?

The h-index of Dr. Aparna K has been 12 since 2020 and 12 in total.

What are Dr. Aparna K's top articles?

The articles with the titles of

INTERNAL MODEL CONTROL OF CUMENE PROCESS USING ANALYTICAL RULES AND EVOLUTIONARY COMPUTATION: Original scientific paper

Investigation on thermochemical characteristics and pyrolysis kinetics of lignocellulosic biomass for biofuel production feasibility

Template assisted sol-gel synthesis of BiFeO3 hollow tubes: Introducing kapok fiber as a bio-template.

TiO2/Graphitic carbon nitride Z-scheme catalyst for binary dye degradation by persulphate activation

Robust control of isopropyl benzene production process using H∞ loop shaping control scheme

Non-isothermal One-Dimensional Two-Phase Model of Water Transport in Proton Exchange Membrane Fuel Cells with Micro-porous Layer

Real-Coded Genetic Algorithm for Fixed Structure PID Controller Tuning in Sodium Chlorate Process

Methyl orange dye adsorbed biochar as a potential Brønsted acid catalyst for microwave-assisted biodiesel production

...

are the top articles of Dr. Aparna K at National Institute of Technology, Calicut.

What are Dr. Aparna K's research interests?

The research interests of Dr. Aparna K are: biofuels, biodiesel from biomass, catalysis

What is Dr. Aparna K's total number of citations?

Dr. Aparna K has 567 citations in total.

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