- Department of Chemical Engineering
National Institute of Technology Rourkela
Rourkela - 769008
Odisha, India - +91-9938246590
Sujit Sen
National Institute of Technology Rourkela, Chemical Engineering, Faculty Member
- Chemistry, Chemical Engineering, Materials Science, Organic Chemistry, Nanotechnology, Computational Chemistry, and 28 moreMedicinal Chemistry, Natural Products Chemistry, Catalysis, Green Chemistry, Process Optimization, NMR Spectroscopy, Organic Chemistry, Drug Design, Computational Chemistry, Nanochemistry, Ionic Liquids, Chemometrics, Reaction Mechanisms, Reaction engineering, Catalysis for Energy Applications, Catalyst Development, Process Synthesis and Optimization, Colloidal and Interfacial Phenomena, Organocatalysis, Statistical Design of Experiment (DoE), Education, Engineering, CO2 capture and storage, CO2 sequestration, Green Technology, Heterogeneous catalysis and characterisation of supported nickel catalysts, steam reforming of methane and biogas, development of sulfur tolerant catalysts for use during reforming, Hydrogen production from renewable material, Nanocatalyst, Environmental Sustainability, and Heterogeneous Catalysisedit
- Present Status: Assistant Professor in the Department of Chemical Engineering, NIT Rourkela,Odisha, India Educatio... morePresent Status:
Assistant Professor in the Department of Chemical Engineering, NIT Rourkela,Odisha, India
Educational Background:
Doctor of Philosophy (Ph.D.), Chemical Engineering, Indian Institute of Technology (IIT), Kharagpur, India, 2011
Master of Technology (M.Tech.), Chemical Engineering, 2003 University of Calcutta, Kolkata, India
Bachelor of Technology (B.Tech.), Chemical Engineering, 2001University of Calcutta, Kolkata, India
Bachelor of Science (B.Sc.), Chemistry (Hons.), 1998 University of Calcutta, Kolkata, Indiaedit
Research Interests:
Phase transfer catalysed selective Zinin reduction of 1-nitronaphthalene by hydrogen sulphide laden aqueous N-methyldiethanolamine.
Research Interests:
Abstract An investigation has been done on the utilization of H2S for the synthesis of dibenzyl disulfide (DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H2S in aqueous monoethanolamine (MEA)... more
Abstract An investigation has been done on the utilization of H2S for the synthesis of dibenzyl disulfide (DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H2S in aqueous monoethanolamine (MEA) followed by reaction of this H2S-laden MEA with organic reactant benzyl chloride (BC) to yield DBDS under liquid–liquid–solid (L–L–S) phase transfer catalysis condition. The effect of various parameters on the conversion of BC was studied and the selectivity of desired product was 100% at some level of process parameters. A suitable reaction mechanism has been proposed and a mathematical model has been developed to explain the kinetics of the reaction. Waste minimization was therefore affected with the utilization of H 2 S -laden gas for production of a value-added fine chemical.
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Dibenzyl sulphide (DBS) was synthesized by the reaction between benzyl chloride and aqueous ammonium sulphide using tetrabutylammonium bromide (TBAB) as phase transfer catalyst (PTC). Benzyl mercaptan (BM) was identified in the reaction... more
Dibenzyl sulphide (DBS) was synthesized by the reaction between benzyl chloride and aqueous ammonium sulphide using tetrabutylammonium bromide (TBAB) as phase transfer catalyst (PTC). Benzyl mercaptan (BM) was identified in the reaction mixture as the secondary product. The selectivity of DBS, was maximized by changing various parameters such as stirring speed, temperature, catalyst loading, concentration of benzyl chloride and NH3/H2S mole ratio. The highest selectivity of DBS obtained was about 90% after 445 minutes of reaction with excess benzyl chloride at 333 K. Complete conversion of benzyl chloride could be achieved at the cost of very low selectivity of DBS and very high selectivity of BM. The apparent activation energy for the kinetically controlled reaction was found to be 174.4 kJ/mol.
Chemical industries, which are the heart of today's technological development of the society, are a major cause of concern for the ever-growing environmental degradation due to harmful waste generation. The importance of waste... more
Chemical industries, which are the heart of today's technological development of the society, are a major cause of concern for the ever-growing environmental degradation due to harmful waste generation. The importance of waste reduction and reuse is therefore paramount. Also, it is better to minimize waste during a reaction than to go for an expensive treatment and/or recovery process after the reaction. Multiphase reactions are frequent in most chemical processes in industries and phase transfer catalysis has already been proven as an effective remedy in enhancing selectivity and yield of desired products. A reusable catalyst-rich phase in the bi-liquid phase reaction is an attractive option because, along with a higher rate of reaction and better selectivity, it can be reused several times, thereby leading to cost-effectiveness. We review here several examples of industrially important reactions involving nucleophilic substitution, etherification, oxidation/reduction, esterifi...
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Nanoporous green materials like nanozeolite has been in focus for their superb efficiency to treat industrial wastewater. The study reports ultrasound assisted hydrothermal method as a very fast method to convert industrial fly ash from... more
Nanoporous green materials like nanozeolite has been in focus for their superb efficiency to treat industrial wastewater. The study reports ultrasound assisted hydrothermal method as a very fast method to convert industrial fly ash from different sources of eastern India to nanozeolite X for efficient removal of toxic dyes and metals from industrial effluent. The pure nanosized zeolite X was synthesized rapidly at 20 min of ultrasound treatment after alkali fusion. The efficiency of nanozeolite X was determined in terms of the adsorption capacity towards various divalent ions such as Zn, Cu, Cd, Pb, Ni, Ca, and Mg as well as various dyes such as methylene blue, crystal violet, indigo carmine, and Congo red. In comparison to commercially available microporous Zeolite X (a maximum of 120.43 mg g for Pb and 134.62 mg g by for methylene blue), all synthesized nanozeolite X shows high adsorption capacity for metals (a maximum of 196.24 mg g for Pb) as well as dyes (193.45 mg g for methyl...
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The kinetics of Zinin reduction of m-chloronitrobenzene (m-CNB) with H2S-laden monoethanolamine (MEA) in a liquid–liquid–solid system catalysed by the anion exchange resin Amberlite IR-400 was investigated.
Research Interests:
The present investigation is based on the advancement in hydrogen sulfide (H 2 S) capture and utilization (HSCU). Commercially H 2 S is absorbed efficiently using alkanolamines such as methyldiethanolamine (MDEA). Aqueous H 2 S-rich MDEA... more
The present investigation is based on the advancement in hydrogen sulfide (H 2 S) capture and utilization (HSCU). Commercially H 2 S is absorbed efficiently using alkanolamines such as methyldiethanolamine (MDEA). Aqueous H 2 S-rich MDEA is proposed to act as a sulfiding agent for aromatic halides such as p-chlorobenzyl chloride (p-CBC) to synthesize value-added thioethers. The objective of the present investigation is to synthesize bis-(p-chlorobenzyl) sulfide (BPCBS), a value-added thioether, selectively using p-CBC and H 2 S-laden aqueous MDEA. For the immiscible bi-phasic system, reusable solid phase transfer catalyst, polymer-bound tributylmethylammonium chloride (PBTBMAC) was employed under liquid-liquid-solid (L-L-S) mode in the presence of solvent toluene to enhance the reaction rate and product selectivity. Full conversion of p-CBC was obtained with 100% selectivity towards the desired product BPCBS at optimized specific level of process parameters. The catalyst has shown substantial activity even after three times of reuse, which leads to waste minimization and economic benefits. A generalized empirical kinetic model was developed and successfully validated against the experimental results. The triphasic reaction thus leads to process intensification, waste minimization and selectivity enhancement. The process can be utilized as an alternative to many other HSCU processes to utilize the sour gas in synthesizing value-added chemicals.
Research Interests:
An investigation has been done on the utilization of H 2 S for the synthesis of dibenzyl disulfide (DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H 2 S in aque-ous monoethanolamine (MEA) followed... more
An investigation has been done on the utilization of H 2 S for the synthesis of dibenzyl disulfide (DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H 2 S in aque-ous monoethanolamine (MEA) followed by reaction of this H 2 S-laden MEA with organic reactant benzyl chloride (BC) to yield DBDS under liquid–liquid–solid (L–L–S) phase transfer catalysis condition. The effect of various parameters on the conversion of BC was studied and the selectivity of desired product was 100% at some level of process parameters. A suitable reaction mechanism has been proposed and a mathematical model has been developed to explain the kinetics of the reaction. Waste minimization was therefore affected with the utilization of H 2 S-laden gas for production of a value-added fine chemical.
Research Interests:
The kinetics of Zinin reduction between m-chloronitrobenzene (m-CNB) and H 2 S-laden monoethanolamine (MEA) in a liquid–liquid–solid (L–L–S) system catalysed by the anion exchange resin Amberlite IR-400 (chloride form) was investigated.... more
The kinetics of Zinin reduction between m-chloronitrobenzene (m-CNB) and H 2 S-laden monoethanolamine (MEA) in a liquid–liquid–solid (L–L–S) system catalysed by the anion exchange resin Amberlite IR-400 (chloride form) was investigated. The selectivity of the product m-chloroaniline (m-CA) was 100%. The reaction was found to be kinetically controlled with an apparent activation energy of 56.16 kJ mol À1. Parametric studies were performed to find out the kinetics of the Zinin reduction and to optimize the influence of process parameters like stirring speed, concentration of m-CNB, concentration of aqueous sulphide, catalyst concentration etc. on the reaction rate and conversion of m-CNB. The reusability of the catalyst was investigated and the catalytic activity of the used catalyst was found to change little even after three recycle runs in comparison to the fresh catalyst. The kinetic model and mechanism of the complex L–L–S phase transfer catalytic process has been developed and the kinetic model has been validated against experimental data. The present reaction is an example of intensification of a multiphase reaction with 100% selectivity to the desired product and can replace the Claus Process of a petroleum refinery as a key process for utilizing hazardous H 2 S gas. Waste minimization was therefore achieved by the use of a reusable catalyst which can also act as a green alternative.
Research Interests:
The present investigation is based on the advancement in hydrogen sulfide (H 2 S) capture and utilization (HSCU). Commercially H 2 S is absorbed efficiently using alkanolamines such as methyldiethanolamine (MDEA). Aqueous H 2 S-rich MDEA... more
The present investigation is based on the advancement in hydrogen sulfide (H 2 S) capture and utilization (HSCU). Commercially H 2 S is absorbed efficiently using alkanolamines such as methyldiethanolamine (MDEA). Aqueous H 2 S-rich MDEA is proposed to act as a sulfiding agent for aromatic halides such as p-chlorobenzyl chloride (p-CBC) to synthesize value-added thioethers. The objective of the present investigation is to synthesize bis-(p-chlorobenzyl) sulfide (BPCBS), a value-added thioether, selectively using p-CBC and H 2 S-laden aqueous MDEA. For the immiscible bi-phasic system, reusable solid phase transfer catalyst, polymer-bound tributylmethylammonium chloride (PBTBMAC) was employed under liquid-liquid-solid (L-L-S) mode in the presence of solvent toluene to enhance the reaction rate and product selectivity. Full conversion of p-CBC was obtained with 100% selectivity towards the desired product BPCBS at optimized specific level of process parameters. The catalyst has shown substantial activity even after three times of reuse, which leads to waste minimization and economic benefits. A generalized empirical kinetic model was developed and successfully validated against the experimental results. The triphasic reaction thus leads to process intensification, waste minimization and selectivity enhancement. The process can be utilized as an alternative to many other HSCU processes to utilize the sour gas in synthesizing value-added chemicals.
Research Interests:
An investigation has been done on the utilization of H2S for the synthesis of dibenzyl disulfide (DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H2S in aqueous monoethanolamine (MEA) followed by... more
An investigation has been done on the utilization of H2S for the synthesis of dibenzyl disulfide
(DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H2S in aqueous monoethanolamine (MEA) followed by reaction of this H2S-laden MEA with organic reactant benzyl
chloride (BC) to yield DBDS under liquid–liquid–solid (L–L–S) phase transfer catalysis condition. The
effect of various parameters on the conversion of BC was studied and the selectivity of desired product
was 100% at some level of process parameters. A suitable reaction mechanism has been proposed and a
mathematical model has been developed to explain the kinetics of the reaction. Waste minimization was
therefore affected with the utilization of H2S-laden gas for production of a value-added fine chemical.
(DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H2S in aqueous monoethanolamine (MEA) followed by reaction of this H2S-laden MEA with organic reactant benzyl
chloride (BC) to yield DBDS under liquid–liquid–solid (L–L–S) phase transfer catalysis condition. The
effect of various parameters on the conversion of BC was studied and the selectivity of desired product
was 100% at some level of process parameters. A suitable reaction mechanism has been proposed and a
mathematical model has been developed to explain the kinetics of the reaction. Waste minimization was
therefore affected with the utilization of H2S-laden gas for production of a value-added fine chemical.
Research Interests:
The current study demonstrated the selective reduction of 1-nitronaphthalene (1-NN) by hydrogen sulphide (H 2 S) absorbed in aqueous N-methyldiethanolamine (MDEA), which is a commonly encountered process in amine treating unit (ATU) of... more
The current study demonstrated the selective reduction of 1-nitronaphthalene (1-NN) by hydrogen sulphide (H 2 S) absorbed in aqueous N-methyldiethanolamine (MDEA), which is a commonly encountered process in amine treating unit (ATU) of petroleum refinery. The modified Zinin reduction has been carried out using tetra-n-butylphosphonium bromide (TBPB) as phase transfer catalyst under Liquid–Liquid (L–L) biphasic mode. The selectivity of product 1-aminonapthalene was found to be 100% and the reaction was kinetically controlled with the activation energy of 20.77 kJ mol À1. The influence of the process parameters like stirring speed, concentration of 1-NN, concentration of aqueous sulphide, concentration of catalyst, MDEA concentration, elemental sulphur loading at different reaction time on the reactant conversion and the reaction rate of 1-NN were studied for establishment of the reaction mechanism. The kinetic model and mechanism of complex L–L phase transfer catalytic process have been developed and then the model has been validated against the experimental data. This approach of reducing 1-NN by H 2 S-laden MDEA can substitute the energy-expensive Claus process, which gives no other product than sulphur.
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ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING Asia-Pac. J. Chem. Eng. (2010) Published online in Wiley InterScience (www.interscience.wiley.com) DOI:10.1002/apj.430 ... Research Article Kinetics of reaction of benzyl chloride with H2S-rich... more
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING Asia-Pac. J. Chem. Eng. (2010) Published online in Wiley InterScience (www.interscience.wiley.com) DOI:10.1002/apj.430 ... Research Article Kinetics of reaction of benzyl chloride with H2S-rich ... Sujit Sen, Narayan C. ...