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- 검색키워드
- 저자 : Sanjeev Kumar Maken (검색결과 5 건)
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Alkaline Peroxide Pretreatment of Waste Lignocellulosic Sawdust for Total Reducing Sugars
Satish Kumar Singh,Sweety Verma,Ishan Gulati,Suman Gahlyan,Ankur Gaur,Sanjeev Maken The Korean Institute of Chemical Engineers 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3
The surge in the oil prices, increasing global population, climate change, and waste management problems are the major issues which have led to the development of biofuels from lignocellulosic wastes. Cellulosic or second generation (2G) bioethanol is produced from lignocellulosic biomass via pretreatment, hydrolysis, and fermentation. Pretreatment of lignocellulose is of considerable interest due to its influence on the technical, economic and environmental sustainability of cellulosic ethanol production. In this study, furniture waste sawdust was subjected to alkaline peroxide (H<sub>2</sub>O<sub>2</sub>) for the production of reducing sugars. Sawdust was pretreated at different concentrations from 1-3% H<sub>2</sub>O<sub>2</sub> (v/v) loadings at a pH of 11.5 for a residence time of 15-240 min at 50, 75 and 90 ℃. Optimum pretreatment conditions, such as time of reaction, operating temperature, and concentration of H<sub>2</sub>O<sub>2</sub>, were varied and evaluated on the basis of the amount of total reducing sugars produced. It was found that the changes in the amount of lignin directly affected the yield of reducing sugars. A maximum of 50% reduction in the lignin composition was obtained, which yielded a maximum of 75.3% total reducing sugars yield and 3.76 g/L of glucose. At optimum pretreatment conditions of 2% H<sub>2</sub>O<sub>2</sub> loading at 75 ℃ for 150 min, 3.46 g/L glucose concentration with a 69.26% total reducing sugars yield was obtained after 48 hr. of the hydrolysis process. Pretreatment resulted in lowering of crystallinity and distortion of the sawdust after the pretreatment, which was further confirmed by XRD and SEM results.
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SnO<sub>2</sub> Mixed Banana Peel Derived Biochar Composite for Supercapacitor Application
( Indu Kaushal ),( Sanjeev Maken ),( Ashok Kumar Sharma ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5
Novel SnO<sub>2</sub> mixed biochar composite was prepared from banana peel developed as electrode material for supercapacitor using simple chemical co-precipitation method. The physiochemical and morphological properties of activated composite SnO<sub>2</sub> mixed biochar were investigated with XRD, FTIR, UV-vis, FESEM and HRTEM. The composite accounts for outstanding electrochemical behavior such as high specific capacitance, significant rate capability and leading to good cycle retention up to 3500 cycles when used as electrode material for supercapacitors. Highly permeable SnO<sub>2</sub> mixed biochar derived from banana peel exhibited maximum specific capacitance of 465 F g<sup>-1</sup> at a scan rate of 10 mV s<sup>-1</sup> by cyclic voltammetry (CV) and 476 Fg<sup>-1</sup> at current density of 0.15 Ag<sup>-1</sup> by charge discharge studies significantly higher about 47% than previously reported identical work on banana peel biochar.
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Shalu Agarwal,Santosh Kumar,Sanjeev Maken 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
A new series of AB2 type monomers with aromatic thio and various number of phenylene units were prepared. Three series of AB2 type monomers, 4-thio-30,50-bis(4-fluorobenzal)biphenyl 1, 4-thio-30 0,50 0-bis(4-fluorobenzal)-p-terphenyl 2 and 4-thio-30 0 0,50 00-bis(4-fluorobenzal)-p-quarterphenyl 3 were synthesized in a stepwise manner starting from 3,5-bis(4-fluorobenzoyl)phenol 4 by repeating a series of conversions of the hydroxy group to the triflate, cross-coupling reaction of the triflate with (pmethoxythiophenyl)boronic acid, reduction of carbonyl groups followed by conversion of methylthio to thio group. Three kinds of hyperbranched poly(ether ketones) were prepared by the polymerization of the these three AB2 type monomers. All compounds were characterized by elemental analysis, thermal analysis, 1H and 13C NMR spectrometry.
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Suman Gahlyan,Manju Rani,Inkyu Lee,문일,Sanjeev Kumar Maken 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Excess molar volumes (VmE) have been measured at 303.15 K for 1-propanol+benzene or toluene or o- orm- or p-xylene mixtures using V-shape dilatometer. The VmEvalues, for an equimolar composition, vary in the order:benzene>toluene~m-xylene>o-xylene>p-xylene. The VmEdata have been used to calculate partial molar volumes,excess partial molar volumes, and apparent molar volumes of 1-propanol and aromatic hydrocarbons over the entirerange of composition. The excess volume data have also been interpreted in terms of graph-theoretical approach andPrigogine-Flory-Patterson theory (PFP). While PFP theory fails to predict the VmEvalues for systems with s-shaped VmEversus x1 graph, the VmEvalues calculated by graph theory compare reasonably well with the corresponding experimen-tal values. This graph theory analysis has further yielded information about the state of aggregation of pure compo-nents as well as of the mixtures.
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Verma Sweety,Bhagat Payal,Gahlyan Suman,Rani Manju,Kumar Naveen,Malik Rajesh Kumar,Lee Yongjin,Maken Sanjeev 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
As N-isopropyl-2-propanamine+alkanol (C1-C3) systems are potential absorbents for CO2 capture, we measured density (ρ), viscosity (η) and the ultrasonic speed data (u) for N-isopropyl-2-propanamine (DIPA) with alkanol (C1-C3) at T=(298.15 and 308.15) K and 0.1 MPa. The experimental density (ρ), viscosity (η) and ultrasonic speed (u) data were used to derive excess molar volume (V E m), apparent, partial, and excess partial molar volume, deviation in viscosity and deviation in ultrasonic speed, excess isentropic compressibility (K E s). We predicted the V E m values using the Prigogine-Flory-Patterson theory (PFP) and by Nakata and Sakurai model. An Ab initio approach was proposed for the excess isentropic compressibility (K E s) and Δη data which not only reproduces the experimental data but also gives important parameters that describe the extent of depolymerization on mixing and strength of intermolecular interactions.
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