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Title: Experimental investigation of the effect of poly-N-vinyl pyrrolidone (PVP) on methane/propane clathrates using a new contact mode
Authors: Daraboina, N.
Linga, P. 
Keywords: Gas hydrates
Hydrate growth
Hydrate inhibition
Kinetic hydrate inhibitor
Silica sand
Issue Date: 9-Apr-2013
Citation: Daraboina, N., Linga, P. (2013-04-09). Experimental investigation of the effect of poly-N-vinyl pyrrolidone (PVP) on methane/propane clathrates using a new contact mode. Chemical Engineering Science 93 : 387-394. ScholarBank@NUS Repository.
Abstract: Hydrate formation experiments were conducted for a methane/propane (90.5/9.5. mol%) gas mixture employing a new contact mode by dispersing water between silica sand to evaluate the performance of poly-N-vinyl pyrrolidone (PVP) as a kinetic hydrate inhibitor. Experiments were performed in the presence of water and different concentrations of PVP solutions (0.1, 0.5 and 1.0. wt%, respectively). Induction time before heterogeneous nucleation and subsequent hydrate growth was assessed by dispersing the water in the interstitial pores of the silica sand. The experiments were conducted at a starting pressure of 4.25. MPa and at a constant temperature of 4.0. °C. It was found that the induction times for 0.1% PVP solutions were about the same of pure water. For the 0.5. wt% PVP solutions, induction times were ten times higher and for 1.0. wt% PVP it was five times higher than pure water. Hydrate formation reached a plateau in one hour for the experiments conducted with pure water while it took longer time (3. h or more) for the experiments conducted in the presence of 1. wt% PVP solutions. This was due to the fact that hydrate growth rate was found to decrease with the increase in the concentration of the PVP solutions. © 2013 Elsevier Ltd.
Source Title: Chemical Engineering Science
ISSN: 00092509
DOI: 10.1016/j.ces.2013.02.011
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