Insights into the behavior of biological clathrate hydrate inhibitors in aqueous saline solutions

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DOIResolve DOI: http://doi.org/10.1021/cg500218q
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TypeArticle
Journal titleCrystal Growth and Design
ISSN1528-7505
Volume14
Issue6
Pages29232930; # of pages: 8
SubjectDifferential scanning calorimetry; Hydration; Antifreeze protein; Clathrate hydrate; Crystallization time; Differential scanning calorimeters; High pressure apparatus; Hydrate decomposition; Hydrophobic forces; Inhibitory activity; Gas hydrates
AbstractThe performance of two antifreeze proteins (AFPs), type I and III (AFP I and III), as kinetic natural gas hydrate inhibitors in saline solutions was evaluated using a high pressure micro differential scanning calorimeter and a high pressure apparatus consisting of two crystallizers. Although AFP I and III were found to prolong crystallization time and reduce initial gas hydrate growth in saline solutions, the growth rate increased when hydrate started to form in the gas phase. Circular dichroism experiments suggested that the saline solution did not perturb AFP I and III structures. However, in the presence of saline, the inhibitory activity of AFP I to prolong induction time decreased while AFP III was more active. As a consequence, we propose that a decrease in hydrophobic forces and the neutralization of ion charges could explain AFP adsorption to the surface of hydrate crystals. Once the hydrate formed, melting was delayed, and consequently hydrate decomposition took longer in the presence of AFPs. We suggest conditions whereby the properties of AFPs could be harnessed for petrochemical recovery and transport. © 2014 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Steacie Institute for Molecular Sciences (SIMS-ISSM)
Peer reviewedYes
NPARC number21272198
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Record identifier14ae2eac-92cc-40d8-8d61-8c5d263d210b
Record created2014-07-23
Record modified2016-05-09
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