2014
DOI: 10.1002/aic.14433
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Rheological evaluation of kinetic hydrate inhibitors in NaCl/n‐heptane solutions

Abstract: The performance of polyvinylpyrrolidone (PVP) and polyvinylcaprolactam (PVCap) as kinetic hydrate inhibitors (KHIs) in the presence of NaCl and n-heptane was evaluated by using a high-pressure cell in conjunction with a rotational rheometer. The addition of KHIs was found to prolong the induction time and decrease the hydrate growth. On the other hand, hydrates agglomerated more readily. PVP performed more efficiently than PVCap in delaying nucleation time but PVCap controlled the growth and delayed agglomerat… Show more

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Cited by 29 publications
(31 citation statements)
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“…Similar behaviour has been observed in previous studies characterizing the rheological properties of hydrate slurries. Hydrate formation experiments have been performed using an aqueous liquid phase initially free of hydrates and an experimental setup similar to the one used in the present study . As in these studies, we assumed that the peak in the temperature of the solution and the rapid increase in its apparent viscosity are two macroscopic indications of the end of the gas hydrate formation induction period and that the time at which they occur can be used as a measure of the induction time.…”
Section: Resultsmentioning
confidence: 99%
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“…Similar behaviour has been observed in previous studies characterizing the rheological properties of hydrate slurries. Hydrate formation experiments have been performed using an aqueous liquid phase initially free of hydrates and an experimental setup similar to the one used in the present study . As in these studies, we assumed that the peak in the temperature of the solution and the rapid increase in its apparent viscosity are two macroscopic indications of the end of the gas hydrate formation induction period and that the time at which they occur can be used as a measure of the induction time.…”
Section: Resultsmentioning
confidence: 99%
“…Hydrate formation experiments have been performed using an aqueous liquid phase initially free of hydrates and an experimental setup similar to the one used in the present study. [48][49][50][51][52] As in these studies, we assumed that the peak in the temperature of the solution and the rapid increase in its apparent viscosity are two macroscopic indications of the end of the gas hydrate formation induction period and that the time at which they occur can be used as a measure of the induction time. The peak in the temperature of the solution can be associated with the sudden release of the enthalpy of formation of a relatively large amount of gas hydrates.…”
Section: Resultsmentioning
confidence: 99%
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“…The nucleation time of hydrate formation is defined as t n , and the induction time is t i = t n – t eq . Since hydrate formation is an exothermic process, the induction time can be measured by monitoring the dramatic changes of temperature and viscosity. , The rotational rheometric tests of the THF hydrate formation were carried out by adding 0.5 wt % of different inhibitors, averaging six tests per sample. The molar fraction of THF (0.069) in the mixture is greater than the molar fraction of THF (0.0556) in the solid THF·17.0 H 2 O.…”
Section: Experimental Sectionmentioning
confidence: 99%