Clathrate Hydrate Equilibrium in Methane–Water Systems with the Addition of Monosaccharide and Sugar Alcohol

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• 作者：Yusuke Jin ; Masato Kida ; Yoshihiro Konno ; Jiro Nagao
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：62
• 期：1
• 页码：440-444
• 全文大小：302K
• ISSN：1520-5134

文摘

Phase equilibrium pressure–temperature (pT) conditions in methane clathrate hydrate (CH₄ hydrate) systems with miscible additives (monosaccharide and sugar alcohol) were measured by an isochoric method using xylose (monosaccharide) and xylitol (sugar alcohol) as additive molecules. The equilibrium pT data were collected in the pressure range of 3–7 MPa and an additive mole fraction range in aqueous solution, x_additive, of 0.006–0.03. The equilibrium pT conditions in both systems existed in higher-pressure regions than that for a additive-free CH₄–water system. Crystals formed in both the systems were identified as structure I CH₄ hydrates by powder X-ray diffraction and Raman spectroscopy measurements. Considering the phase boundary and crystallography results, xylose and xylitol acted as thermodynamic inhibitors for clathrate hydrate systems.