02138nas a2200241   4500008004100000022001400041245009000055210006900145260007100214300001400285490000600299520129500305653001501600653001601615653001501631653002901646653001801675100002601693700001901719700001901738700001901757856012001776       2015                        eng d  a2168-048500aCarbon dioxide sequestration: influence of porous media on hydrate formation kinetics0 aCarbon dioxide sequestration influence of porous media on hydrat  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUN  a1205-12140 v33 a<p>In the present study, CO, sequestration by hydrate formation in porous sediments has been discussed. Two siliceous materials with high porosities, pumice and fire hardened red clay (FHRC), have been used as packing materials in a fixed bed setup to study hydrate formation kinetics. The results obtained using the aforementioned materials were compared with those obtained using silica sand and quartz. Carbon dioxide hydrate formation kinetics was studied at 3.0 MPa pressure and 274 K temperature. Two different types of experiments were conducted: (a) using a constant volume of water and (b) maintaining a constant bed height. These experiments were conducted using the different porous media individually as packing materials. It was observed that pumice as the porous medium showed better hydrate formation kinetics resulting in 46 mol % water to hydrate conversion in 5 h. Moreover, kinetics was enhanced with decrease in the bed height of pumice; this suggests that at field scale adaptation of CO, sequestration in geological formations, mass transfer limitations would be significant. The effects of particle size on hydrate formation kinetics were also investigated. It was observed that hydrate formation kinetics was enhanced with decrease in the particle size fraction.</p>10aBed height10aGas hydrate10agas uptake10aGeological sequestration10aParticle size1 aBhattacharjee, Gaurav1 aKumar, Asheesh1 aSakpal, Tushar1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/carbon-dioxide-sequestration-influence-porous-media-hydrate-formation-kinetics-001845nas a2200229   4500008004100000022001400041245011200055210006900167260007700236300001200313490000600325520102600331653001501357653001301372653001501385653001301400653002401413100001901437700001901456700001901475856012101494       2015                        eng d  a2194-428800aInfluence of low-dosage hydrate inhibitors on methane clathrate hydrate formation and dissociation kinetics0 aInfluence of lowdosage hydrate inhibitors on methane clathrate h  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUL  a717-7250 v33 a<p>This work investigates the effect of low-dosage hydrate inhibitors (LDHIs) on methane hydrate formation and dissociation. The hydrate inhibitors used in this study were the sodium salt of polyacrylic acid, a polysaccharide chitosan, and the linear sulfated polysaccharide i-carrageenan; the inhibiting behavior of these additives were compared with that of the commonly used hydrate inhibitor polyvinylpyrrolidone for methane hydrate formation. A LDHI concentration of 1wt% was found to increase the induction time relative to that at a LDHI concentration of 0.1wt%. Chitosan was found to be better than the others in reducing nucleation and the growth rate of the hydrate at a concentration of 1wt%. At a lower concentration of 0.1wt%, nucleation inhibition was minimal, however, growth inhibition was significant. The effect of these inhibitors on the decomposition rate of the hydrate was also studied, and the decomposition kinetics at a constant driving force in excess of three-phase equilibrium is reported.</p>10agas uptake10ahydrates10ainhibitors10akinetics10athermal stimulation1 aKumar, Asheesh1 aSakpal, Tushar1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/influence-low-dosage-hydrate-inhibitors-methane-clathrate-hydrate-formation-and-0