Effects of kinetic inhibitors on the formation and growth of hydrate crystals at a liquid-liquid interface

Hiroyuki Sakaguchi, Ryo Ohmura, Yasuhiko H. Mori

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The paper reports visual observations of the formation and growth of clathrate hydrate crystals at the interface between HCFC-141b (CH3CCl2F) and water to which a kinetic inhibitor, poly(N-vinylpyrrolidone) (PVP) or poly(N-vinylcaprolactam) (PVCap), was applied at 0.2wt% at most. The crystalline morphology of the hydrate at the interface was found to be substantially altered by the addition of either inhibitor. PVP causes a greater change in morphology than PVCap does, while PVCap shows a stronger inhibition effect on the hydrate growth at the interface. Despite its effect of reducing the rate of growth of hydrate crystals along the interface, PVP promotes the growth of hydrate crystals from the already hydrate-covered interface into the aqueous phase whether or not the phase is saturated by the hydrate former, HCFC-141b, in advance. The critical condition for complete inhibition has been determined for each inhibitor.

Original languageEnglish
Pages (from-to)631-641
Number of pages11
JournalJournal of Crystal Growth
Volume247
Issue number3-4
DOIs
Publication statusPublished - 2003 Jan
Externally publishedYes

Fingerprint

liquid-liquid interfaces
Hydrates
hydrates
inhibitors
Crystals
Kinetics
kinetics
Liquids
crystals
visual observation
clathrates
Crystalline materials
Water
causes
water

Keywords

  • A1. Crystal morphology
  • A1. Mass transfer
  • A1. Optical microscopy
  • A2. Hydrate crystal growth
  • B1. Clathrate hydrates
  • B2. Kinetic inhibitors

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Effects of kinetic inhibitors on the formation and growth of hydrate crystals at a liquid-liquid interface. / Sakaguchi, Hiroyuki; Ohmura, Ryo; Mori, Yasuhiko H.

In: Journal of Crystal Growth, Vol. 247, No. 3-4, 01.2003, p. 631-641.

Research output: Contribution to journalArticle

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N2 - The paper reports visual observations of the formation and growth of clathrate hydrate crystals at the interface between HCFC-141b (CH3CCl2F) and water to which a kinetic inhibitor, poly(N-vinylpyrrolidone) (PVP) or poly(N-vinylcaprolactam) (PVCap), was applied at 0.2wt% at most. The crystalline morphology of the hydrate at the interface was found to be substantially altered by the addition of either inhibitor. PVP causes a greater change in morphology than PVCap does, while PVCap shows a stronger inhibition effect on the hydrate growth at the interface. Despite its effect of reducing the rate of growth of hydrate crystals along the interface, PVP promotes the growth of hydrate crystals from the already hydrate-covered interface into the aqueous phase whether or not the phase is saturated by the hydrate former, HCFC-141b, in advance. The critical condition for complete inhibition has been determined for each inhibitor.

AB - The paper reports visual observations of the formation and growth of clathrate hydrate crystals at the interface between HCFC-141b (CH3CCl2F) and water to which a kinetic inhibitor, poly(N-vinylpyrrolidone) (PVP) or poly(N-vinylcaprolactam) (PVCap), was applied at 0.2wt% at most. The crystalline morphology of the hydrate at the interface was found to be substantially altered by the addition of either inhibitor. PVP causes a greater change in morphology than PVCap does, while PVCap shows a stronger inhibition effect on the hydrate growth at the interface. Despite its effect of reducing the rate of growth of hydrate crystals along the interface, PVP promotes the growth of hydrate crystals from the already hydrate-covered interface into the aqueous phase whether or not the phase is saturated by the hydrate former, HCFC-141b, in advance. The critical condition for complete inhibition has been determined for each inhibitor.

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