Dipesh Patle | Universiti Sains Malaysia (original) (raw)

Papers by Dipesh Patle

Authorea (Authorea), Oct 20, 2020

In this study, new processes are designed for ultrasound assisted in situ algal biodiesel product... more In this study, new processes are designed for ultrasound assisted in situ algal biodiesel production using ionic liquid catalyst. Process retrofitting is then conducted using a divided-wall column (DWC) and multistage vapor recompression (MVR). Later, comparative analysis in terms of capital cost, cost of manufacturing (COM), cost of biodiesel, and carbon emission is presented. This study shows that the biodiesel cost is linearly dependent on the cost of feedstock and process economics can be improved by converting glycerol to triacetin. The process with DWC and MVR resulted in a significant saving in COM (13.84%), biodiesel cost (18.24%), utility cost (45.44%) and carbon emissions (45.84%) than those in its counterpart. New major contributions of this work are 1) process design for a novel ultrasound assisted and ionic liquid catalyzed algal biodiesel production, 2) implementation of DWC and MVR and 3) investigation of the uncertainty in the thermodynamic property.

IOP conference series, Mar 1, 2016

A recyclable solid catalyst of KF/Ca-Mg-Al-O using for biodiesel production from jatropha seed oi... more A recyclable solid catalyst of KF/Ca-Mg-Al-O using for biodiesel production from jatropha seed oil: preparation, characterization, and methanolysis process optimization Qinghong You, Xiulian Yin, Jun Wang et al.-State-of-the-art catalysts for clean fuel (methyl esters) production-a comprehensive review Farrukh Jamil, Muhammad Saleem, Obaid Ali Qamar et al.

$Research paper thumbnail of Oxygen excess ratio control of PEM fuel cell: fractional order modeling and fractional filter IMC-PID control$

Chemical Product and Process Modeling, Jul 10, 2023

Concerning global warming, an energy-efficient power source must produce low or no pollutant emis... more Concerning global warming, an energy-efficient power source must produce low or no pollutant emissions and provide an unlimited fuel supply. Proton Exchange Membrane fuel cell (PEMFC) is an electrochemical device that transforms chemical energy into electrical energy. The performance and durability of PEM fuel cells are affected by voltage reversals and fuel starvation. Oxygen Excess Ratio (OER) is a crucial factor in controlling the fuel starvation of the PEMFC system. First, this work identified the PEMFC as an integer order and fractional-order first order plus time delay models using the predictor error method and Grunwald–Letnikov simulation method based on a trust-region-reflect algorithm, respectively. Fractional order models more accurately represented the PEM fuel cell system dynamics. Then, robust fractional filters cascaded with PID controllers based on the Internal Model Control scheme (IMC) are designed for identified integer and fractional order models to regulate the OER by compressor voltage manipulation. The genetic Algorithm (GA) optimization technique is used to find the optimal fractional filter tuning parameters. The proposed controller’s performance regarding Integral Absolute Error (IAE) and Total Variance (TV) is analyzed. Furthermore, the robustness of a perturbed plant and fragility with perturbed controllers are elucidated. The results show that a fractional filter cascaded with fractional order PID controller improves the performance compared to a fractional filter cascaded with integer order PID controllers.

Biomass Conversion and Biorefinery, Jan 15, 2021

h i g h l i g h t s Chlorosulfonic acid modified zirconia was applied in biodiesel production. FA... more h i g h l i g h t s Chlorosulfonic acid modified zirconia was applied in biodiesel production. FAME yield reached 100% consecutively for 5 cycles even under mild conditions. Catalyst synthesis condition-activities relations were studied.

Journal of Molecular Liquids, Aug 1, 2019

Abstract Phthalocyanines (Pc) are good photosensitizers due to the intensive colour that makes th... more Abstract Phthalocyanines (Pc) are good photosensitizers due to the intensive colour that makes them suitable in oxidation and reduction besides their applications in pigments. In this study, a polymer supported Fe-Phthalocyanine entangled with carboxyl functionalized benzimidazolium moiety (PSFePcCFBM) was synthesized and characterized by analytical techniques such as Fourier-Transform Infrared Spectroscopy (FT-IR), Fourier-Transform Nuclear Magnetic Resonance (FT-NMR) and Thermo Gravimetric Analysis (TGA). The photocatalytic activity of the heterogeneous PSFePcCFBM catalyst was assessed for the degradation of the Methylene Blue (MB), Methyl Violet (MV) and Congo Red (CR). The change in concentration of the dyes was studied by UV–Visible spectroscopy and the degradation dye was confirmed by GC–MS. The complete photocatalytic degradation of the MB, MV and CR was achieved in 60 min with 10 mg, 15 mg and 12.5 mg catalyst respectively with atmospheric air. The catalyst showed admirable activity towards the degradation, devoid of any additives such as ZnO/TiO2 in the presence of 5 W LED lamp as a source of light, and was highly recyclable. Therefore, it was inferred that this protocol is suitable for the degradation of organic pollutants effectively in the absence of any additives.

Biomass Conversion and Biorefinery, Jul 5, 2023

ADVANCES IN FRACTURE AND DAMAGE MECHANICS XX

Chemical Engineering Communications

Environmental Chemistry Letters

Energy Conversion and Management

Environmental Science and Pollution Research

Background of this Special Issue Constant growth of population and its never-ending needs have pr... more Background of this Special Issue Constant growth of population and its never-ending needs have prompted rapid industrialization, which in turn resulted in gradual deterioration of the environment. Energy is central to the human kind and its pervasive consumption has made the tremendous impact on environment as a result of continuously growing and ever-increasing energy needs of society. Hence, technological interventions for promoting sustainability are inevitable to secure clean environment. United Nations (UN) has defined sustainable development goals as presented in Fig. 1. Technological advancements can play a key role in achieving these sustainable development goals. In this respect, CHEM-CONFLUX 22 , a multidisciplinary international conference, was jointly organized by MNNIT Allahabad (Prayagraj, India) and USM Malaysia (Malaysia) during April 14-16, 2022, with the objective of inviting ideas emphasizing on the thrust areas pertaining to sustainable development. With this special issue, it is aimed to understand the current trends of research that is being conducted pertaining to the broad themes of energy & environment, and to examine the exciting & key research areas that can be taken up further highlighting the inter-disciplinary nature of the field. It is expected that this issue will help the scientific community, in general, and young scientists in particular to come up with excellent research projects for sustainable development.

Nowadays, the application of the proton exchange membrane fuel cells (PEMFCs) is advancing as a p... more Nowadays, the application of the proton exchange membrane fuel cells (PEMFCs) is advancing as a popular renewable energy source. PEMFCs must operate at low temperatures, have high power density, and be easily implemented. These features contorted them into the most compelling type of fuel cell. However, PEMFCs need a strategy for maintaining the voltage at a desired operating point, specifically during the current variation. The present study proposes a novel Multiple-Input-Single-Output (MISO) control structure for a PEMFC system to improve its performance. This study focuses on airflow optimization and hydrogen consumption optimization, as the literature focuses more on airflow optimization for compressor or pump performance. To give an outlook, a two-input-two-output PEMFC system, with air and hydrogen flow rates as inputs and cell voltage and load current as outputs, is considered a two-input-single-output system by fixing the output resistance. The fractional order model is rea...

Journal of Chemical Technology & Biotechnology, 2021

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

Innovative approaches in pyrolysis process to recover energy from plastic wastes in a sustainable... more Innovative approaches in pyrolysis process to recover energy from plastic wastes in a sustainable manner are being explored progressively. Present study reports the effect of vacuum on pyrolysis of polyethylene waste in the presence of zinc oxide as a catalyst. Firstly, the effect of vacuum on the pyrolysis of low-density polyethylene (LDPE) and high-density polyethylene (HDPE) wastes was investigated by conducting the pyrolysis at various applied vacuums of 101.325 kPa, 88 kPa, 73 kPa, 60 kPa, and 47 kPa in the absence of catalyst. Vacuum was observed to have positive effect on the pyrolysis in terms of increase in the yield of liquid product. Further, the effect of zinc oxide on the pyrolysis was studied by performing the pyrolysis at various catalyst feed ratios of 3:100, 5:100, 10:100 and 15:100 under the applied vacuum of 50 kPa. The maximum yield of liquid product obtained was 74.58% and 78.65% for the waste LDPE and HDPE, respectively, for the catalyst feed ratio of 15:100 and at applied vacuum of 50 kPa. GC-MS analysis of the liquid products demonstrated that the major fraction of hydrocarbons present is in a sufficiently narrow range. The fuel properties of the obtained liquid product were also determined.

Bioresource Technology Reports

Chemical Product and Process Modeling, 2020

Process Safety and Environmental Protection

Chemical Product and Process Modeling

The present work deals with the evaluation of model based control strategies for a PEM fuel cell ... more The present work deals with the evaluation of model based control strategies for a PEM fuel cell to control voltage. PEM fuel cell is an electrochemical device that converts the chemical energy to electrical energy. Stack voltage is affected by many factors like stack temperature, moisture content of the membrane, partial pressure of hydrogen and air, inlet rate of hydrogen and air and also fuel starvation affects the rate of reaction and hence the voltage produced. In this work, two single input single output models are taken with stack voltage as controlled variable and hydrogen and air flow rate as manipulated variables respectively. The simulation study on two different control structures i.e., feedback and feedback plus feed forward control structures evaluates the effectiveness of proposed controllers concerning set-point tracking and disturbance rejection. Comparative study is carried out by simulations by implementing various model based control strategies, PI, IMC-PID and M...