Insights into the Kinetics of Methane Hydrate Formation in a Stirred Tank Reactor by In Situ Raman Spectroscopy

Abstract

We present a new method to observe the kinetics of methane hydrate formation by the simultaneous application of macroscopic and microscopic measurements. In a stirred tank stabilized under two different subcooling conditions, both the consumption rate of methane by water and in situ Raman spectra were measured with time. According to our observations, an abrupt decline in the intensity of the Raman peak of dissolved methane coincided with an increase in the intensity of the Raman peak of methane that occupies the large cages of the hydrate at the beginning of hydrate formation. The occupancy of the small cages only occurred after a considerable delay from the nucleation point, whereas the occupancy of the large cages occurred throughout the growth period. Thus, the early stage of hydrate growth shows a strong preference of the dissolved methane to occupy the large cages.

Inhibition of methane and natural gas hydrate formation by altering the structure of water with amino acids

“…The in situ Raman measurements were performed at the Korea Institute of Industrial Technology. The details of the in situ Raman spectroscopy system have previously been documented 48 49 . The SUS 315 high pressure cell and SUS 315 supply vessel have volumes of 333 mL and 1848.3 mL respectively.…”

Phase Behavior and Raman Spectroscopic Analysis for CH4 and CH4/C3H8 Hydrates Formed from NaCl Brine and Monoethylene Glycol Mixtures

“…Further details of the experimental apparatus, including a real-time Raman system, are available elsewhere. 10,11 Prior to each hydrate phase equilibrium measurement, the pressure cell was filled with 100 g of aqueous sample (a mixture of 10 wt % NaCl brine and 10 or 30 wt % MEG). The mixture solution was prepared by initially taking a 10 wt % of NaCl solution and then adding MEG to make it 10 or 30 wt % in MEG, gravimetrically.…”

Experimental Investigation of Effect on Hydrate Formation in Spray Reactor

“…The essence of the crystal growth process is the migration of the solute molecules on the surface of the crystal. The process of macro performance is the formation of a large amount of gas hydrate [13,14].…”