Promoting Effect of Ultra-Fine Bubbles on CO2 Hydrate Formation

When gas hydrates dissociate into gas and liquid water, many gas bubbles form in the water. The large bubbles disappear after several minutes due to their buoyancy, while a large number of small bubbles (particularly sub-micron-order bubbles known as ultra-fine bubbles (UFBs)) remain in the water for a long time. In our previous studies, we demonstrated that the existence of UFBs is a major factor promoting gas hydrate formation. We then extended our research on this issue to carbon dioxide (CO2) as it forms structure-I hydrates, similar to methane and ethane hydrates explored in previous studies; however, CO2 saturated solutions present severe conditions for the survival of UFBs. The distribution measurements of CO2 UFBs revealed that their average size was larger and number density was smaller than those of other hydrocarbon UFBs. Despite these conditions, the CO2 hydrate formation tests confirmed that CO2 UFBs played important roles in the expression of the promoting effect. The analysis showed that different UFB preparation processes resulted in different promoting effects. These findings can aid in better understanding the mechanism of the promoting (or memory) effect of gas hydrate formation.

[1]  Praveen Linga,et al.  Carbon Dioxide Sequestration via Gas Hydrates: A Potential Pathway toward Decarbonization , 2020 .

[2]  T. Uchida,et al.  Contribution of Ultra-Fine Bubbles to Promoting Effect on Propane Hydrate Formation , 2020, Frontiers in Chemistry.

[3]  Hailong Lu,et al.  Effect of Micro- and Nanobubbles on the Crystallization of THF Hydrate Based on the Observation by Atomic Force Microscopy , 2020, The Journal of Physical Chemistry C.

[4]  METHaNE fROM HydRaTES,et al.  Methane hydrates , 1996, Catalysis from A to Z.

[5]  S. Zendehboudi,et al.  Molecular scale modeling approach to evaluate stability and dissociation of methane and carbon dioxide hydrates , 2020 .

[6]  T. Uchida,et al.  Gas Nanobubbles as Nucleation Acceleration in the Gas-Hydrate Memory Effect , 2016 .

[7]  Marco J. Castaldi,et al.  Simulation of CO2 storage and methane gas production from gas hydrates in a large scale laboratory reactor , 2016 .

[8]  J. Nagao,et al.  Thermal and Crystallographic Properties of Tetra-n-butylammonium Bromide + Tetra-n-butylammonium Chloride Mixed Semiclathrate Hydrates , 2016 .

[9]  T. Uchida,et al.  Generation of micro- and nano-bubbles in water by dissociation of gas hydrates , 2016, Korean Journal of Chemical Engineering.

[10]  Shu Liu,et al.  Effect of NaCl on the Lifetime of Micro- and Nanobubbles , 2016, Nanomaterials.

[11]  J. Ripmeester,et al.  Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth. , 2015, The Journal of chemical physics.

[12]  S. Takeya,et al.  Natural gas storage and transportation within gas hydrate of smaller particle: Size dependence of self-preservation phenomenon of natural gas hydrate , 2014 .

[13]  Patrick G. Hartley,et al.  Quantitative kinetic inhibitor comparisons and memory effect measurements from hydrate formation probability distributions , 2014 .

[14]  Hideki Tanaka,et al.  Effect of bubble formation on the dissociation of methane hydrate in water: a molecular dynamics study. , 2014, The journal of physical chemistry. B.

[15]  A. Delahaye,et al.  Accurate DSC measurement of the phase transition temperature in the TBPB–water system , 2013 .

[16]  M. Kelland,et al.  Investigation into the strength and source of the memory effect for cyclopentane hydrate , 2013 .

[17]  S. Oshita,et al.  Basic Characterization of Nanobubbles and their Potential Applications , 2013 .

[18]  D. Lohse,et al.  A deliberation on nanobubbles at surfaces and in bulk. , 2012, Chemphyschem : a European journal of chemical physics and physical chemistry.

[19]  R. Ohmura,et al.  Clathrate Hydrate Formation from Cyclopentane-in-Water Emulsions , 2008 .

[20]  Masayoshi Takahashi,et al.  Zeta potential of microbubbles in aqueous solutions: electrical properties of the gas-water interface. , 2005, The journal of physical chemistry. B.

[21]  A. Soper,et al.  Search for memory effects in methane hydrate: structure of water before hydrate formation and after hydrate decomposition. , 2005, The Journal of chemical physics.

[22]  Hiroyuki Oyama,et al.  Tetra-n-butylammonium bromide-water (1/38). , 2005, Acta crystallographica. Section C, Crystal structure communications.

[23]  E. D. Sloan,et al.  Fundamental principles and applications of natural gas hydrates , 2003, Nature.

[24]  K. Yasuoka,et al.  Statistical study of clathrate-hydrate nucleation in a water/hydrochlorofluorocarbon system: Search for the nature of the memory effect , 2003 .

[25]  Tsutomu Uchida,et al.  Observations of CO2-hydrate decomposition and reformation processes , 2000 .

[26]  S. Takeya,et al.  Freezing-Memory Effect of Water on Nucleation of CO2 Hydrate Crystals , 2000 .

[27]  P. Rodger Methane Hydrate: Melting and Memory , 2000 .

[28]  J. Gudmundsson,et al.  Laboratory for Continuous Production of Natural Gas Hydrates , 2000 .

[29]  P. Bishnoi,et al.  INVESTIGATIONS INTO THE NUCLEATION BEHAVIOUR OF METHANE GAS HYDRATES , 1996 .

[30]  J. Gudmundsson,et al.  Frozen hydrate for transport of natural gas , 1996 .

[31]  G. D. Holder,et al.  An experimental study of crystallization and crystal growth of methane hydrates from melting ice , 1990 .

[32]  K. Kvenvolden Methane hydrate — A major reservoir of carbon in the shallow geosphere? , 1988 .