Kinetics of Methane Hydrate Formation in an Aqueous Solution with and without Kinetic Promoter (SDS) by Spray Reactor

Hydrate formation apparatus reported so far was mainly concentrated in stirred-tank batch environments. It was difficult to produce the high gas storage hydrate efficiently. Some nonstirred technology has been attracting more attention by researchers. This work proposed a new apparatus for hydrate formation by spraying water into a gaseous phase with a fine nozzle. It can get sufficient contact surface area for gas-liquid reaction. Methane hydrate formation experiments have been conducted using pure water and sodium dodecyl sulfate (SDS) aqueous solution for comparison at 277.15 K. The experiments were conducted at 7.0 and 6.0 MPa, respectively. Kinetics of methane hydrate formation have been investigated by methane consumption per mole of water and reaction rate. The mechanism of hydrate formation and kinetics property by spraying atomization were studied with the theory of crystal chemistry.

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Insights into Kinetics of Methane Hydrate Formation in the Presence of Surfactants

Processes ◽

10.3390/pr7090598 ◽

2019 ◽

Vol 7 (9) ◽

pp. 598 ◽

Cited By ~ 10

Author(s):

Pandey ◽

Daas ◽

von Solms

Keyword(s):

Induction Time ◽

Methane Hydrate ◽

Large Scale ◽

Sodium Dodecyl ◽

Hydrate Formation ◽

Gas Storage ◽

Vital Role ◽

Gas Uptake ◽

Formation Kinetics ◽

Kinetics Of

Sodium dodecyl sulfate (SDS) is a well-known surfactant, which can accelerate methane hydrate formation. In this work, methane hydrate formation kinetics were studied in the presence of SDS using a rocking cell apparatus in both temperature-ramping and isothermal modes. Ramping and isothermal experiments together suggest that SDS concentration plays a vital role in the formation kinetics of methane hydrate, both in terms of induction time and of final gas uptake. There is a trade-off between growth rate and gas uptake for the optimum SDS concentration, such that an increase in SDS concentration decreases the induction time but also decreases the gas storage capacity for a given volume. The experiments also confirm the potential use of the rocking cell for investigating hydrate promoters. It allows multiple systems to run in parallel at similar experimental temperature and pressure conditions, thus shortening the total experimentation time. Understanding methane hydrate formation and storage using SDS can facilitate large-scale applications such as natural gas storage and transportation.

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Kinetics of methane hydrate formation in an aqueous solution of thermodynamic promoters (THF and TBAB) with and without kinetic promoter (SDS)

Journal of Natural Gas Science and Engineering ◽

10.1016/j.jngse.2016.06.013 ◽

2016 ◽

Vol 35 ◽

pp. 1519-1534 ◽

Cited By ~ 45

Author(s):

Deepjyoti Mech ◽

Pawan Gupta ◽

Jitendra S. Sangwai

Keyword(s):

Aqueous Solution ◽

Methane Hydrate ◽

Hydrate Formation ◽

Kinetics Of

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Research of Surfactants Effect on Methane Hydrate Formation with Properties of Biochemical Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.675.284 ◽

2013 ◽

Vol 675 ◽

pp. 284-288 ◽

Cited By ~ 1

Author(s):

Bin Dou ◽

Hui Gao ◽

Lei Ren

Keyword(s):

Sodium Dodecyl Sulfate ◽

Methane Hydrate ◽

Pure Water ◽

Sodium Dodecyl ◽

Water System ◽

Hydrate Formation ◽

Liquid Pool ◽

Pool Surface ◽

Dodecyl Sulfate ◽

Gas Consumption

This paper deals with the effects of a surfactant additive on the formation of methane hydrate in water system with and without sodium dodecyl sulfate (SDS). The properties of sodium dodecyl sulfate are listed. The results manifested that the presence of SDS could not only accelerate the hydrate formation process, but also increase the partition coefficient of methane between hydrate and vapor drastically. The paper then describes our experimental observations of the hydrate formation from methane, to show how the hydrate formation behaviors are affected by the additives of chamber partially filled with a quiescent pool of water (pure water or an aqueous SDS solution) to compensate for the gas consumption due to the hydrate formation, thereby maintaining a constant pressure inside the chamber. The results revealed that the addition of SDS not only on the liquid-pool surface but also on the chamber walls above the level of the pool surface, leaving the bulk of the liquid pool free from hydrate crystals. An excessive addition of SDS beyond the solubility was found to cause a decrease in the rate of hydrate formation but an increase in the final level of the water-to-hydrate conversion.

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