01991nas a2200229   4500008004100000022001400041245009600055210006900151260009000220300001000310490000600320520113200326100001601458700003101474700001901505700002901524700002301553700002101576700002201597700001801619856012401637       2016                        eng d  a2045-232200aBiosurfactant as a promoter of methane hydrate formation: thermodynamic and kinetic studies0 aBiosurfactant as a promoter of methane hydrate formation thermod  aMACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLANDbNATURE PUBLISHING GROUPcFEB  a208930 v63 a<p>Natural gas hydrates (NGHs) are solid non-stoichiometric compounds often regarded as a next generation energy source. Successful commercialization of NGH is curtailed by lack of efficient and safe technology for generation, dissociation, storage and transportation. The present work studied the influence of environment compatible biosurfactant on gas hydrate formation. Biosurfactant was produced by Pseudomonas aeruginosa strain A11 and was characterized as rhamnolipids. Purified rhamnolipids reduced the surface tension of water from 72 mN/m to 36 mN/m with Critical Micelle Concentration (CMC) of 70 mg/l. Use of 1000 ppm rhamnolipids solution in C type silica gel bed system increased methane hydrate formation rate by 42.97% and reduced the induction time of hydrate formation by 22.63% as compared to water saturated C type silica gel. Presence of rhamnolipids also shifted methane hydrate formation temperature to higher values relative to the system without biosurfactant. Results from thermodynamic and kinetic studies suggest that rhamnolipids can be applied as environment friendly methane hydrate promoter.</p>1 aArora, Amit1 aCameotra, Swaranjit, Singh1 aKumar, Rajnish1 aBalomajumder, Chandrajit1 aSingh, Anil, Kumar1 aSanthakumari, B.1 aKumar, Pushpendra1 aLaik, Sukumar  uhttps://library.ncl.res.in/content/biosurfactant-promoter-methane-hydrate-formation-thermodynamic-and-kinetic-studies-102087nas a2200229   4500008004100000245008000041210006900121260000800190300001400198490000800212520133400220100002601554700002001580700002101600700001701621700001601638700002501654700002601679700002701705700001901732856010601751       2017                        eng d00aBiosurfactant surfactin as a kinetic promoter for methane hydrate formation0 aBiosurfactant surfactin as a kinetic promoter for methane hydrat  cMAY  a5011-50170 v1053 aIn the present study, the effect of the biosurfactant Surfactin on methane hydrate formation kinetics was studied. Initially, several marine derived species were screened for the presence of Surfactin. The polymerase chain reaction technique was used as the preliminary screening step for Surfactin which was then followed up by a couple of different assays to provide conclusive evidence of the same. Based on these tests, the D-9 bacterial strain was identified as a producer of Surfactin. Once the presence of Surfactin had been proven, its effect on methane hydrate formation kinetics was investigated upon by carrying out hydrate formation experiments in a stirred tank reactor. The cell free supernatant containing Surfactin was itself used as the hydrate forming solution without any further processing. It was found that the presence of Surfactin in the system greatly enhances hydrate formation kinetics as compared to pure water. In fact the kinetics in presence of Surfactin also surpassed that obtained with 1 wt% SDS, the most commonly used synthetic kinetic hydrate promoter. This basic study can pave the way for more sophisticated research on the use of biosurfactants as kinetic promoters with a view on rapid methane hydrate formation kinetics for applications such as methane separation, storage and transport.1 aBhattacharjee, Gaurav1 aBarmecha, Vivek1 aPradhan, Darshan1 aNaik, Rajesh1 aZare, Kirti1 aMawlankar, Rahul, R.1 aDastager, Syed, Gulam1 aKushwaha, Omkar, Singh1 aKumar, Rajnish  uhttps://library.ncl.res.in/content/biosurfactant-surfactin-kinetic-promoter-methane-hydrate-formation