Institute of Technology

Dr. R. K. Mewada

Dr. R. K. Mewada


Total Experience 17 Year
Educational Qualification Ph.D. Chemical Engineering - UICT, Mumbai
Research Area Catalysis and Reaction Engineering, Multiphase Operations, Equipment Design, Process Development using Renewable Resources, Solar Energy Utilization for Hydrogen Production and Waste Treatment
General information
Designation Professor
Office Phone 07930642517
Cabin No PG 105
Email rkmewada@nirmauni.ac.in

Dr R K Mewada has more than 15 years of experience in the field Teaching, Research and Industry. He is currently working as a Professor since May 2015 in Chemical Engineering Department. He has pursued his doctoral study at University Institute of Chemical Technology (UICT), Mumbai (now Institute of Technology, Mumbai) during 2005 to 2009. One Indian and one International patent have been applied based on his doctoral study. He is having 10 international journal publications in his credit. He has also presented more than 20 papers at national and international conferences. He has been awarded first prize for "ISTE-IPCL Best M. Tech. Thesis Award - 2001" for his M. E. research research work. He is working in the field of Catalysis and Reaction Engineering, Multiphase Operations, Equipment Design, Process Development using Renewable Resources, Solar Energy Utilization for Hydrogen Production and Waste Treatment using catalysis. Apart from technical aspects he is interested in field of spiritual learning.He is also life member of various institutes like IIChE, ISTE, UAA.


Current Activities : Catalyst development and kinetic study for cyclohexane oxidation reaction, Polymeric material development for radiation harden polymer for satellite applications and controlled drug delivery, Process development for hydrogen production by water splitting using thermochemical cycles
Experience
Teaching 16 Year 7 Month
Industry 9 Month
Contact
Website -
Blog -
Membership LMIIChE, LMISTE, LMUAA, LMNITAA

Specialization
Specialization Areas Catalysis and Reaction Engineering, Multiphase Operations, Process Design and Development,
Subject Taught UG Process Equipment Design-I and II, Chemical Reaction Engineering - I and II
Subject Taught PG Process Integration and Resource Management, Adv. ProcessEquipment Design-I and II, Adv. Catalytic Reaction Engineering, Piping Design, Chemical Process Design Principles (CPDP),

Hobbies
Reading, Music and Traveling for spiritual development

Dr. R. K. Mewada - Achievements


TitleDescriptionAchieved On
UGC – Senior Research Fellowship to pursue Ph. D. (Tech.) programme at UICT, Mumbai Received UGC – Senior Research Fellowship to pursue Ph. D. (Tech.) programme at UICT, Mumbai from 15th Oct., 2005 to 15th January, 2009 October 2005
Best M. Tech. Thesis Award – 2001 1st Prize for ISTE-IPCL Best M. Tech. Thesis Award-2001 December 2001

Dr. R. K. Mewada - Experience


Institute / OrganizationDesignationDuration
Institute of Technology, Nirma UniversityProfessor May 2015 To till date
Institute of Technology, Nirma UniversityAssociate Professor October 2010 To May 2015
Institute of Technology, Nirma UniversityAssistant Professor February 2009 To September 2010
Institute of Technology, Nirma UniversityLecturer June 2001 To February 2009
Gujarat Petrosynthese Ltd.Graduate Tranee Engineer October 1998 To July 1999

Dr. R. K. Mewada - Publication


 

Book

TitleISSN / ISBN No PublisherVolumeYear
polymers in modified drug delivery systems 978-3-659-39234-4Lambert Academic Publishing 2013

International Conference

TitleISSN / ISBN No PublisherVolumeYear
A Case Study on Design of Ammonia Condenser: Effect of Independent Variables 2321-2705  2014

International Journal

TitleISSN / ISBN No PublisherVolumeYear
Visible/solar light active photocatalysts for organic effluent treatment: fundamentals, mechanisms and parametric review 1364-0321Elsevier76C2017
Crosslinking of starch and its effect on viscosity behaviour 0167-8299Reviews in Chemical Engineering (RevChemEng).32(2): 265–2702016
Minimization of exergy losses in mono high pressure nitric acid process 1742-8300International Journal of ExergyVol. 17, No. 2, Page No. 192-2182015
Synthesis of Covalently Crosslinked Chitosan-Starch Copolymers through Reactive Blending for Oral Drug Delivery 2319-5983Journal of Environmental Research and DevelopmentVol. 9 No. 04, April – June 2015, Page No. 1133-112015
The influence of stabilisers on resistance to gamma radiation for Epoxy based Polymeric composite material 1359-8368Composites Part B: Engineering, Science Direct, ElsevierVolume 57, Pages 71-792014
Study the effect of dispersion of filler in polymer composite for radiation shielding 1548-0569Polymer Composites, WileyVolume 35, Issue 72014
An overview of Exergy analysis for Chemical Process Industries, International Journal of Exergy 1742-8300International Journal of ExergyVol. 15, Issue 4, Pages 468-5072014
Chitosan: Development of Nanoparticles, Other Physical Forms and Solubility with Acids 1661-9897Journal of Nano Research, Trans Tech PublicationsVolume 24, Sep. 2013, Pages 107-122.2013
Novelties of Azobenzene Synthesis via Selective Hydrogenation of Nitrobenzene over nano-fibrous Ag-OMS-2 - Mechanism and Kinetics 1385-8947Chemical Engineering Journal, Science Direct, ElesevierVolume 221, 1 April 2013, Pages 500-5112013
Selective hydrogenation of acetophenone to 1-phenyl ethanol over nanofibrous, Ag-OMS-2 catalysts 0920-5861Catalysis Today, Science Direct, ElsevierVolume 198, Issue 1, 30 December 2012, 330–3372012
Selectivity engineering in the synthesis of value added chemicals: Oxidation of 1-octanol to 1-octanal over nano-fibrous Ag–OMS-2 catalysts 0263-8762Chemical Engineering Research and Design, Science Direct, ElsevierVolume 90, Issue 1, January 2012, Pages 86-972012

National Conference

TitleISSN / ISBN No PublisherVolumeYear
Solar Photoreactors: A Comprehensive Review 978-93-5262-686-1  2017

Dr. R. K. Mewada - Qualification


QualificationSpecializationUniversityPassing Year%Class
Ph.D. Chemical Engineering Mumbai University University Institute of Chemical Technology (UICT), Mumbai July 2009   
M.E. Chemical Engineering (Petrochemical Engineering) The M. S. Univesity of Baroad, Vadodarat The Faculty of Technology and Engineering August 2001 71.00First
B.E. Chemical Engineering Gujarat University, India The Govt. Engineering College, Gandhinagar July 1998 68.40First class

Dr. R. K. Mewada - Activity


Activity TypeActivity TitlePlaceDateFaculty Role
STTP / SDP / FDP / QIP Computation and Simulation in Chemical Engineering Nirma University02/07/2012Participant
National Workshop Computational Tool for Chemical Engineer- Design of Heat Exchangers using HTRI Chemical Engineering Dept06/08/2010Coordinator
STTP / SDP / FDP / QIP Resource Conservation through Process Integration Chemical Engineering Dept., IT, NU27/06/2011Coordinator

Dr. R. K. Mewada - Research Projects


Fund TypeAgencyStart DateDurationPrincipal Investigator
External FundingGujarat Council on Science and Technology (GUJCOST), Gandinagar15/12/2014 - PI - Dr. R. K. Mewada, Dr. Sanjay Patel
Internal FundingNirma University02/08/20101PI - Dr. R. K. Mewada

Dr. R. K. Mewada - Project Guided


Project TitleDescriptionDuration
Kinetic Study of Cyclohexane Oxidation Reaction using Heterogeneous Catalysts Selective oxidation of cyclohexane is continued to be a most difficult and most challenging reaction for researchers. Industrial processes suffer from very low conversions (about 4 to 6%) and poor selectivity for K-A oil (about 70-80%). This shows tremendous scope for improvement in conversion or selectivity for KA-oil production. Development of new process for direct oxidation of cyclohexane in presence of oxygen or air with higher conversion and good selectivity is the main objective of the current researcher. Literature survey suggests that the air oxidation of cyclohexane produces only limited conversion, about 10-19% with 80-95% selectivity with gold metal and different supports like ZSM-5, MCM-41, SBA-15. Further efforts and understanding is required to reduce activation energy and replace the traditional process of cyclohexane oxidation to K-A oil. Even thermodynamically 100% conversion of cyclohexane is feasible, practically cyclohexane conversion is kept about only 4-6 % in industrial operation and about 10-19% conversion of cyclohexane at laboratory scale is achieved due to severe selectivity problem.Out of all this characterization technique only Scanning Electron microscopes (SEM) would be carried out. SEM would be shown morphology and particle size of syntheise catalyst. In current work, silver loaded alumina, MCM-41,SBA-15 were synthesized using wet-impregnation as well as in-situ method of catalyst preparation. Among various synthesized catalyst Ag/Al2O3 have a good conversion as well as selectivity. In the current work, silver dropped with alumina (Ag/Al2O3) was studied with different silver loading in the range of 3 w/w% in Ag/Al2O3) showed the highest conversion and selectivity for K-A oil mixture. Effects of various parameters such as Effect of speed of agitator, catalyst loading, air pressure, and temperature have been studied using design of experiment concept. Based on that developed model it might be help in reduce number of experiments. In this work included designed and fabricated new reactor which can be operated at lower pressure and can provide enormous amount of surface area for mass transfer. It is expected that it can improve the rate of reaction as well as improve the conversion and selectivity for the desired products. The main objective of this work was to develop Langmuir–Hinshelwood–Hougen–Watson (LWHW) mechanism, Eieley-Ridedel, Mars–van Krevelen mechanism kinetic model of the catalyzed cyclohexane oxidation reaction. It may be help to design of rector. Keywords : Selective oxidation of cyclohexane, K-A oil, Thermodyanmics anlysis, Kinetic study Contents May 2014
Production of Bioalcohol – Study of various routes using non-edible renewable resources. Bioalcohols are attractive alternative to petroleum derived fuel. Combustion characteristics, engine performance , use of widely available low cost non edible biomass without competing with food and feed production leads to selection of biobutanol from bioalcohol family. Rice straw, corn stover and saw dust were hydrolyzed by applying acid hydrolysis pretreatment and fermentation of butanol was carried out by C. acetobutylicum species. Acetone and ethanol are also produced in this process. Hydrolyzates of these substrates resulted in production of butanol yield of 0.167 g/gmol, 0.212 g(or gmol)/gmol, and 0.070 g(or gmol)/gmol respectively. After confirmation of butanol production from non edible sources, effect of change in different parameters was examined. Initial Sugar concentration was changed to half of maximum concentration of rice straw resulted in 0.039 g(or gmol)/gmol yield. Initial concentration of saw dust was changed to maximum concentration resulted in 0.0455 g(gmol)/gmol butanol yield while at lower concentration butanol production was not observed. Seed culture concentrations were also changed but it did not effect to butanol fermentation and give similar results. Temperature apply to shaker bath was changed to 45 ?C and room temperature from 37ºC , at 45ºC butanol was not observed and at room temperature results was similar to 37 ºC. Keywords: bioalcohol, biobutanol, rice straw,corn stover, clostridium acetobutylicum NCIM 2337, clostridium pasteurianum May 2014
Metal-organic frameworks (MOFs): Synthesis and applications Metal organic frameworks (MOFs) are a recently identified new class of hybrid porous material, consisting of metal ions or cluster linked together by organic bridging ligands. MOFs have been shown tremendous potential in adsorptive separation application and gas storage owing to some of their extraordinary features in terms of specific area, pore volume, low to moderate heat of adsorption and fairly uniform pore size distribution. This project work is focused on the synthesis and characterization of different MOFs and their application in adsorptive separations. MOFs are crystalline compound consisting of metal ions/cluster coordinated to often rigid organic molecules to form one, two, three dimensional structures that can be porous. The pore size and surface properties of these materials can be tuned to a great extent with relative ease by choosing appropriate metal centers and organic ligands. MOFs have got advantages over existing porous materials and zeolite. They possess a wide array of potential applications including materials for gas storage, gas/vapor separation, catalysis, luminescence, and drug delivery. May 2014
Selectivity Engineering for Cyclohexane Oxidation Reaction using Solid Catalysts In chemical industry selective oxidation of hydrocarbons are of great importance. In most of the oxidation reactions, complete oxidation results into undesirable products. Oxidation of hydrocarbon to more valuable organic compound such as alcohol, ketone, aldehyde requires selective oxidation of strong C-H bond. Cyclohexane oxidation represents a typical example of this kind of reactions, which became an interesting subject from academic and industrial point of view. On a commercial scale most of the cyclohexane produced is used for the production of cyclohexanone and cyclohexanol, which is also known as KA-(Ketone-Alcohol) oil. KA-oil is an important intermediate in the in the production of Nylon-6 and Nylon-66. In the present commercial process for cyclohexane oxidation, reaction is carried out at 150 oC. and 1-2 MPa pressure which aords 4% conversion and 70-85 % selectivity to cyclohexanone and cyclohexanol over metal cobalt salt or boric acid. This shows tremendous scope for improvement in conversion or selectivity for KA-oil production. Objective of the present work is to develop heterogeneous catalytic system to enhance the conversion and selectivity for KA oil. Various catalysts were synthesized and activity of the same was tested for cyclohexane oxidation reaction using molecular oxygen. Ag-SBA-15 catalyst has shown about 10.5 % conversion with 86 % selectivity for KA-oil. Catalyst was characterized to correlate with its activity for cyclohexane oxidation. May 2013
Separation of Propylene from propane by using adsorption. Propylene is the second most important starting product in the petrochemical industry after ethylene. It is the raw material for a wide variety of products. The separation of propane and propylene is an energy intensive process due to close boiling point. The separation of propane and propylene is an energy intensive process due to close boiling point.So, other less energy consuming processes were developed for separation of propane propylene mixture. Non-conventional methods like physisorption by 4A, 5A, 13X zeolites, MOFs, and chemisorption by Ag+ and Cu+ solution shows suitability for propane propylene separation.Experiments carried out by addition of stabilizing agent (pyridine) to the copper salt solution. Additionally this solution is lees corrosive than other anhydrous system. From the experiments it is found that 2.0M CuNO3•2.1 pyridine shows best results during separation of propane and propylene. Propylene loading is 23 cm3/cm3 of adsorbent propane loading is 1 cm3/cm3 of adsorbent. From the experiment carried out by taking unsaturated LPG as feed, it was found that the copper pyridine complex can be used for the separation of olefin and paraffin of C4 hydrocarbon with less severity. From the experiments with silver nitrate solution and propane propylene mixture it was found that, silver nitrate is more suitable for the separation of propane propylene mixture. Propylene loading is 5.6 mmol/g of silver nitrate salt. The separation factor of propane propylene achieved 92% by silver nitrate solution. The separation factor is more than cuprous pyridine complex. 61% pure propylene achieved from adsorbed stream of the experiment carried out with C3 splitter bottom (97.5% propane and 2.5% propylene) and silver nitrate. So, after single recycle polymer grade propylene can be achieved. The selectivity of propylene increases with increase in mol fraction of propylene in the feed. Adsorption of propylene carried out by silver nitrate impregnated on highly porous silica (MCM-41). The propylene loading found 1.7 mmol/g of adsorbent and 1.85 mmol/g of silver nitrate. May 2013
Green Process Development for Production of 1,2 Propane-diol from Hydrogenation of Glycerol In current scenario, in general researchers are looking for renewable resources for production of commercially important products. Biodiesel production, from various renewable resources, by conventional esterification /or trans-esterification reaction, produces glycerol as one of the major co-product. Thus glycerol from biodiesel is renewable resource. Due to presence of three –OH groups in glycerol its becomes higly functional molecule and various commercially important products can be produced like 1,2 Propane-diol. Production of 1,2 Propane-diol through glycerol is an attractive route to use renewable resources. This work presents review of various routes for glycerol to 1,2 Propane-diol reaction using heterogeneous catalyst. Based on literature survey, copper alumina phosphate (CAP) shows highest possible conversion with very good selectivity for 1,2 Propane-diol. However such reactions were carried at very high temperature and pressure, i.e. more than 220°C and more than 52 bar(g) pressure. CAP catalyst was synthesized with different synthesis method and different promoters to enhance conversion and selectivity. Liquid phase reactions were carried out in high pressure reactor in presence of synthesized heterogeneous catalysts. Reaction mixture was analyzed using gas chromatography techniques. Objective to carry out this work was to reduce the severity of the operation with good conversion and selectivity. But results are not encouraging. Copper alumina phosphate (with KOH as promoter) shows highest possible conversion, 5.5% at 30 bar(g) pressure, 180°C temperature and 5 hours reaction time. Under similar conditions NaOH promoted CAP shows 4.2% conversion compared to 51% in the literature at higher temperature and pressure conditions. Two major reasons for poor performance can be contributed to improper preparation of catalyst and less severe conditions of operation can be considered. Keywords: Glycerol, 1,2 Propane-diol, Hydrogenation, Conversion, Selectivity May 2013
Catalytic Oxidative Dehydrogenation of C4-Butane/Butenes to 1,3 Butadiene Commercial availability and low price of light alkane/alkenes make them very attractive in many branches of industry. Potentially interesting is their use in the process of oxidative dehydrogenation leading to production of dienes. In particular Oxidative dehydrogenation of n-butene has attracted much attention as a promising process for on-purpose 1,3-butadiene production. This study was undertaken to carry out oxidative dehydrogenation of butane/butenes to 1,3-butadiene (important substrate in production of synthetic rubber and polyamides) taking place over the zinc-ferrite catalysts prepared by co-precipitation method. A series of zinc ferrite (ZnFe2O4) catalysts was prepared by a co-precipitation method and applied to the oxidative dehydrogenation of 1-butene to 1,3-butadiene. Different parameters were studied for the synthesis of zinc ferrite catalyst like Fe:Zn atomic ratio, eect of pH in the preparation, crystallinity, surface acidity, washing of the precipitate. NH3-TPD experiments were conducted to correlate the acid property with the catalytic performance of zinc ferrite catalysts. The acid property of zinc ferrite catalyst plays an important role in abstracting an a-hydrogen atom from n-butene to form P-allyl intermediate. It was revealed that the yield for 1,3-butadiene increased with increasing surface acidity of the catalyst. Selective partial oxidation including the oxidative dehydrogenation of n-butene proceeds by Mars-Van Krevelen Redox mechanism. It was observed that the catalytic activity is signicantly dependent upon not only on the crystallinity but also the composition of ferrite catalyst. If crystallinity of a catalyst is too high, the oxygen spill over through the lattice is severely suppressed and the redox mechanism is no longer eective and results in low catalytic activity. Solid state studies using X-ray diraction and FT-IR spectroscopy indicated that the zinc ferrite phase was formed on the synthesized catalyst. Catalyst Testing Unit was developed to test the activity of the synthesized catalyst. Catalytic test were performed in a continuous xed bed catalytic reactor at temperatures around 350-650°C. It was revealed that at low reaction temperatures, around 300 to 370°C conversion of n-butene vii and selectivity for 1,3-butadiene was low. Selectivity for 1,3-butadiene was high at temperatures around 400-480°C. At very high temperatures around 500-600°C side reactions were maximum. Among the various catalyst prepared, ZnFe2O4 prepared at pH 9 (binded with alumina) showed the best catalytic performance in the oxidative dehydrogenation of 1-butene with May 2012
Design and Development of Fluidized Bed Reactor Fluidized bed reactor works on the principle of fluidization. Fluidization is an industrially important and highly complex phenomenon. Its design and development requires sound fundamentals and understanding of hydrodynamics and reaction engineering. In this work, process of coal to fuel is considered. Due to energy and environmental issues, there is a high interest to produce synthesis gas (syngas) , basically a mixture of H2, CO and CO2, which opens up to making a variety of downstream energy carriers. The syngas may be used as a fuel in integrated gasification combined cycles (IGCC) or as a feedstock for producing H2 or a synthetic natural gas (SNG). Coal gasification – and virtually gasification of other carbon-based resources such as biomass or refinery residues - is a versatile conversion technology adding flexibility to the energy systems. The syngas produces from the gasification process can be used to produce the variety of synthetic fuels like diesel,naphtha and LPG by conducting fischer tropsch synthesis. Gasification is an important route for conversion of coal or solid wastes materials i.e. biomass to useful gaseous products for direct firing in thermal applications and as well as raw gas for production of fuels or chemicals. Gasification with O2, H2O, CO2 and H2 produces combustibles such as CH4 and CO/H2 mixtures for use as gaseous fuels or chemical feed stocks. Among the coal-gasification processes, the fluidized-bed process with inherent advantages of high heat transfer and easy handling of solids is a natural choice. Coal gasification with O2 and H2O in a fluidized-bed reactor involves pyrolysis, combustion and steam gasification. Gasification in fluidized bed offers advantages, since fluidized beds are capable of being scaled up to medium and large scale, overcoming limitations found in smaller scale, fixed-bed designs. In this work the modeling of a fluidized bed coal gasifier is discussed which uses a coal as its feed. A two phase model consisting of the bubble phase and the emulsion phase is used to describe the coal gasification process.A non-isothermal model has been considered taking into account the effect of heterogeneous reactions and homogeneous reactions. Homogeneous reactions involve gas-gas reactions which incorporates the gasification reactions taking place in the fluidized bed gasifier and heterogeneous reactions involve gas-solid reactions that incorporates the combustion reactions. For gases in both emulsion and bubble phase, it can predict concentration profiles , gas composition, velocities and other fluid dynamic parameters.The fluid dynamics parameters like minimum fluidization velocity (Umf), bubble diameter (db), bubble velocity (Ub) have been studied as a function of bed height. Model has been solved numerically using MATLAB. MATLAB program has been developed to study the fluid dynamics parameters as a function of bed height. Also the changes in the molar fraction of produ May 2012
Combined Cooling, Heating and Power Generation System using Solar Energy Combined Cooling, Heating and Power (CCHP) systems, including various technolo- gies, provide an alternative for the world to meet and solve energy-related problems, such as energy shortages, energy supply security, emission control, the economy and conservation of energy, etc. this has been discussed in the paper and a detailed review of CCHP technologies and its comparison with the individual Separate(SP) Technologies has been shown through various graphs. Also focused has been made on using the solar light for the generation of steam in the CCHP system which could immensely e ect the energy shortages-a challenge that world is facing today. In order to have this technology running it would be necessary to have a greater know-how and working towards increasing its eciency is also required.The system is rst designed and simulated as per the lab scale requirements using HYSYS and HTRI software. Energy and exergy of traditional and CCHP power generation systems are analyzed. Energy eciency of the traditional mode of power gneration is 22.186% and exergy is 23.4 %. Whereas energy eciency of CCHP plant is 48.2% and exergy eciency is 45.6% respectively. Instruments are sized using K.G.tower and HTRI software. May 2011
Value Addition to Spent Catalysts and Adsorbents Catalysis is one of the 12 principles of the green chemistry in which catalyst is used to change the rate of chemical reaction and a ect the reaction environment favorably. But the catalyst activity may decrease to very low levels and further regeneration may not be economically feasible. Hence the spent catalysts are eventually discarded as solid wastes. Present study is aimed at exploring an e ective method to utilize exhausted petroleum catalyst discarded in large volume from petroleum re ning industries. Silica and alu- mina are the major components of selected spent catalyst. Considering the quality and quantity of the available exhausted catalyst, an attempt to use this as raw mate- rial for synthesis of zeolite is explored. Also, its probable application as support for making heterogeneous catalyst is explored. May 2011

Dr. R. K. Mewada - PhD Students


StudentResearch TitleResearch FieldStatus
Samir C Nimkar Exergy Analysis for the Chemical Process Improvement to save Energy, Environment & Resources Exergy AnalysisPursuing
Mamta M Saiyed Radiation hardened plastic packaging for VLSI PolymerPursuing
Nimish Rajnikant Shah Development of polymer for modified drug delivery Interdisciplinery (Chemical - Pharmacy)Pursuing
Leena V. Bora Development of Waste Treatment Process using Solar Energy  Pursuing