00609nas a2200157   4500008004100000245010700041210006900148260000800217300001000225490000800235100001900243700001900262700001900281700001900300856013200319       2015                        eng d00aEnhanced carbon dioxide hydrate formation kinetics in a fixed bed reactor filled with metallic packing0 aEnhanced carbon dioxide hydrate formation kinetics in a fixed be  cJAN  a78-850 v1221 aKumar, Asheesh1 aSakpal, Tushar1 aLinga, Praveen1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/enhanced-carbon-dioxide-hydrate-formation-kinetics-fixed-bed-reactor-filled-metallic-packing01808nas a2200181   4500008004100000245014400041210006900185260000800254300001400262490000700276520110100283100001901384700002701403700002601430700001901456700001901475856013201494       2016                        eng d00aEffect of additives on formation and decomposition kinetics of methane clathrate hydrates: application in energy storage and transportation0 aEffect of additives on formation and decomposition kinetics of m  cNOV  a2160-21670 v943 aMethane gas storage and transportation via clathrate hydrates is proposed to be a potential solution for large-scale energy storage. In this work, we study the formation and decomposition kinetics of methane hydrates (MH) in a laboratory-scale unstirred crystallizer. The present investigation demonstrates comparative studies of hydrate formation and dissociation kinetics in the presence of tetrahydrofuran (55.6 and 27.8mmol/mol, 5.56 and 2.78mol% THF) and sodium dodecyl sulphate (1mg/g, 0.1wt% SDS). Moreover, the storage capacity and hydrate formation kinetics in both the systems are discussed. In a recent work, enhanced methane hydrate growth in the presence of THF at close to atmospheric conditions was demonstrated. The emphasis of the current work is to study the stability of hydrates to understand dissociation kinetics by measuring the rate of hydrate decomposition at different temperatures. Hydrate stability measurements were performed at -8, -3, 2, 10, and 20 degrees C to study the decomposition rates of MH and self-preservation in presence of the two additives THF and SDS.1 aKumar, Asheesh1 aKushwaha, Omkar, Singh1 aRangsunvigit, Pramoch1 aLinga, Praveen1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/effect-additives-formation-and-decomposition-kinetics-methane-clathrate-hydrates-application01684nas a2200265   4500008004100000022001400041245011500055210006900170260009900239300001400338490000700352520069900359653001901058653002001077653002201097653002101119653001601140653002301156100001601179700001901195700002601214700002201240700002901262856012701291       2016                        eng d  a0261-306900aEffect of different fixed bed media on the performance of sodium dodecyl sulfate for hydrate based CO2 capture0 aEffect of different fixed bed media on the performance of sodium  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN  a1186-11910 v903 a<p>Sodium Dodecyl Sulfate (SDS) is used as a kinetic promoter in gas hydrate formation. In this work, the performance of SDS for carbon dioxide gas hydrate formation in two different fixed bed media: silica sand and zeolite (5A and 13X) has been evaluated. The concentration of SDS was fixed at 0.5 wt%. The experiments were carried out in batch mode with the initial pressure fixed at 3.0 MPa, and the temperature kept constant at 274.65 K. The results showed that hydrate of carbon dioxide with fixed bed of silica sand was significantly promoted by the addition of SDS as compared to the other fixed bed medium used in this study: zeolite 13X. (c) 2015 Elsevier Ltd. All rights reserved.</p>10aCarbon dioxide10aFixed bed media10aHydrate formation10aKinetic promoter10aSilica sand10aZeolite 5A and 13X1 aArora, Amit1 aKumar, Asheesh1 aBhattacharjee, Gaurav1 aKumar, Pushpendra1 aBalomajumder, Chandrajit  uhttps://library.ncl.res.in/content/effect-different-fixed-bed-media-performance-sodium-dodecyl-sulfate-hydrate-based-co2-002099nas a2200253   4500008004100000022001400041245007600055210006900131260000800200300001400208490000700222520131000229653001501539653001901554653001601573653001301589653003301602100002601635700002201661700001901683700002301702700001901725856010101744       2016                        eng d  a1875-510000aEffect of the amino acid L-histidine on methane hydrate growth kinetics0 aEffect of the amino acid Lhistidine on methane hydrate growth ki  cSEP  a1453-14620 v353 a<p>In the present study, the effect of a polar amino acid, L-histidine on methane hydrate growth kinetics has been investigated. Methane hydrate formation experiments were carried out in a stirred tank reactor setup at pressure and temperature conditions of 274.15 K and 5.0 MPa respectively. Two different concentrations (0.1 and 1 wt %) of L-histidine were studied. Hydrate growth through molecular dynamic (MD) simulation was also studied; pressure and temperature conditions for the simulations were set at 10.0 MPa and 270.0 K, while the concentration of L-histidine was kept fixed at 0.94 wt %. Hydrate formation runs using MD simulation were carried out with optimal concentration of methane in water. The presence of L-histidine in the system was found to significantly enhance methane hydrate growth kinetics as compared to pure water for both experimental and MD simulation runs. Final gas consumption with 1 wt % L-histidine was found to be comparable to that with 1 wt % SDS, the most commonly used additive for hydrate promotion studies. L-histidine is a benign additive which offers considerable enhancement in methane hydrate formation kinetics and can be utilized for various hydrate based technologies such as methane storage and transport. (C) 2016 Elsevier B.V. All rights reserved.</p>10aAmino acid10aCrystal growth10aGas hydrate10akinetics10aMolecular dynamic simulation1 aBhattacharjee, Gaurav1 aChoudhary, Nilesh1 aKumar, Asheesh1 aChakrabarty, Suman1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/effect-amino-acid-l-histidine-methane-hydrate-growth-kinetics01692nas a2200169   4500008004100000245014600041210006900187260000800256300001600264490000800280520102800288100001901316700002001335700001901355700001901374856012901393       2016                        eng d00aExperimental investigation to elucidate why tetrahydrofuran rapidly promotes methane hydrate formation kinetics: applicable to energy storage0 aExperimental investigation to elucidate why tetrahydrofuran rapi  cDEC  a29062-290680 v1203 aMethane storage as SNG (solidified natural gas) in the form of clathrate hydrates is an emerging, economically feasible and environmentally benign technology for large scale storage. Mixed tetrahydrofuran (THF)-methane (CH4) hydrates offer a paradigm shift to milder storage conditions and faster hydrate formation kinetics, providing a promising scenario to scale up the SNG technology. In this work, we synthesize mixed THF-CH4 hydrates in a high pressure microdifferential scanning calorimeter (HP mu-DSC) to elucidate the two-step hydrate formation mechanism of mixed THF-CH4 hydrate identifying the synergism between THF and CH4. Heat flow change during hydrate formation and dissociation of mixed THF-CH4 hydrates formed in the presence of 5.56 mol % THF (stoichiometric composition) were monitored. The two step-mechanism of mixed THF-CH4 hydrate formation was further confirmed by the pressure-temperature profile and visual observations with a sample volume scale -up of about 350 times that of mu-DSC experiments.1 aKumar, Asheesh1 aDaraboina, Nagu1 aKumar, Rajnish1 aLinga, Praveen  uhttps://library.ncl.res.in/content/experimental-investigation-elucidate-why-tetrahydrofuran-rapidly-promotes-methane-hydrate01712nas a2200193   4500008004100000245006700041210006700108260000800175300001400183490000700197520108000204100002601284700002701310700001901337700002601356700002401382700001901406856009301425       2017                        eng d00aEffects of micellization on growth kinetics of methane hydrate0 aEffects of micellization on growth kinetics of methane hydrate  cAPR  a3687-36980 v563 aSurfactants are Specific functional materials, that form various types of self-assemblies and affect local water ordering alongside solution properties. Such surface active agents are used extensively in gas hydrate based applications as kinetic hydrate promoters. To understand the effect of surfactant micelles on hydrate formation kinetics, a novel surfactant system capable of producing micelles at hydrate forming temperature was developed. The presence of surfactant micelles in this new system (a combination of anionic surfactant SDS and zwitterionic surfactant CAPB) was determined through DLS measurements. Pure methane and a coal bed methane mixture were individually used to assess the efficacy of the surfactant mixture for hydrate formation. This study conclusively proves for the first time that the presence of surfactant micelles enhances hydrate formation kinetics. The findings reported here can contribute significantly toward improving the utility of surfactants in gas hydrate based technological applications such as gas separation and methane storage.1 aBhattacharjee, Gaurav1 aKushwaha, Omkar, Singh1 aKumar, Asheesh1 aKhan, Muzammil, Yusuf1 aPatel, Jay, Narayan1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/effects-micellization-growth-kinetics-methane-hydrate