Freezing-memory effect of water on nucleation of CO2 hydrate crystals

Article Abstract:

A new study investigates the nucleation rates of CO2 hydrate crystals for differently-treated water samples.

Chemistry, Physical and theoretical, Physical chemistry, Nucleation, Nucleation (Chemistry)

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Phase equilibrium measurements and crystallographic analyses on structure-H type gas hydrate formed from the CH4-CO2-neohexane-water system

Article Abstract:

Phase equilibrium conditions and the crystallographic properties of structure-H type gas hydrates containing various amounts of methane (CH4), carbon dioxide (CO2), neohexane (2,2-dimethylbutane (NH)), and liquid water are investigated. In the batch-type reactor, this process might cause the fractionation of the remaining vapor composition in the opposite sense as that for CH4-CO2 hydrate, resulting in an alternating formation of structure-H hydrates and structures-I in the same batch-type reactor.

Industrial Gas Manufacturing, Industrial gases, Carbon Dioxide, Methane

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Crystal lattice size and stability pf type H clathrate hydrates with various large-molecule guest substances

Article Abstract:

Powder X-ray diffraction (PXRD) measurements and semiempirical molecular orbital calculations are performed to understand the effects of guest molecules on the lattice and stability of type H hydrates. The calculations of cohesive energy by means of a semiempirical molecular orbital method have shown that the functional group and configuration of large-molecule guest substances affects the stability of type H hydrates.

Science & research, Analysis, Observations, Anisotropy, X-rays, X-ray diffraction, Clathrate compounds, Properties, Structure, Molecular orbitals

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