In this work, experimental kinetics data of methane hydrate decomposition at temperatures ranging from 272.15 to 276.15 K and at pressures ranging from 10 to 30 bars were modeled by using chemical affinity. This model proposed a macroscopic model which is independent of any intermediate mechanism like heat or mass transfer. The results show there is good agreement with experimental data. Al...

Hydrate formation/dissociation of natural gas in (diesel oil + water) emulsion systems containing 3 wt% anti-agglomerant were performed for five water cuts: 5, 10, 15, 20, and 25 vol%. The natural gas solubilities in the emulsion systems were also examined. The experimental results showed that the solubility of natural gas in emulsion systems increases almost linearly with the increase of press...

In this article, the effect of sodium dodecyl sulfate (SDS) as an anionic surfactant on the thermodynamics, formation rate, formation kinetic, critical micellar concentration (CMC) and stability of methane hydrate was studied. A CMC of SDS and water solution for methane hydrate formation conditions in a batch process was measured at 450 ppm, where CMC was determined by hydrate induction time. I...

−Segregation and deposition of hydrate particles observed in flowloop experiments are required to be investigated more thoroughly to understand the hydrate plugging mechanism in offshore flowlines. We used natural gas as gas phase and selected three different systems as liquid phase, which are pure water only, kinetic hydrate inhibitor added aqueous solution, and water+decane mixture, respectiv...

Introduction: The composition of the martian polar caps has long been debated with a consensus opinion that the north is composed predominately of water ice and the south a combination of solid CO2 and water ice [1]. Smythe and Miller [2] suggested that the polar caps may be composed of at least some CO2 hydrate, aka. clathrate, or compound gas hydrates [3, 4, 5, 6, 7]. Durham [8] predicted tha...

Researchers at DOE’s National Energy Technology Laboratory (NETL) have been investigating the formation of synthetic gas hydrates, with an emphasis on rapid and continuous hydrate formation techniques. The investigations focused on unconventional methods to reduce dissolution, induction, nucleation and crystallization times associated with natural and synthetic hydrates studies conducted in the...

Due to high efficiency and low cost, hydrate-based desalination is investigated as a pretreatment method for seawater desalination. To improve the formation rate of hydrates, effect sodium dodecyl sulfate (SDS) on CO2 hydrate from 3.5 wt.% NaCl solution was measured at 275 K 3 MPa. X-ray diffraction (XRD) cryo-scanning electron microscopy (cryo-SEM) were used measure crystal structure micromorp...

how to cite this article: ashrafimr, azizi malamiri r, zamani gr, mohammadi m, hosseini f. sleep inducing for eeg recording in children: a comparison between oral midazolam and chloral hydrate. iran j child neurol. 2013 winter;7(1):15-19. objective electroencephalography (eeg) recording is a long duration procedure that needs patient’s cooperation for device setup and performing the procedure. ...