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

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 598 ◽  
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.

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

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Yaqin Tian ◽  
Yugui Li ◽  
Hongping An ◽  
Jie Ren ◽  
Jianfeng Su
Keyword(s):  
Aqueous Solution ◽  
Methane Hydrate ◽  
Reaction Rate ◽  
Pure Water ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Gas Storage ◽  
Liquid Reaction ◽  
New Apparatus ◽  
Kinetics Of

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.

Investigation of the kinetics of mixed methane hydrate formation kinetics in saline and seawater

2019 ◽  
Vol 253 ◽  
pp. 113515 ◽  
Author(s):  
Hari Prakash Veluswamy ◽  
Asheesh Kumar ◽  
Rajnish Kumar ◽  
Praveen Linga
Keyword(s):  
Methane Hydrate ◽  
Hydrate Formation ◽  
Formation Kinetics ◽  
Kinetics Of

scholarly journals Influence of THF and THF/SDS on the Kinetics of CO2 Hydrate Formation Under Stirring

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongliang Wang ◽  
Qiang Wu ◽  
Baoyong Zhang
Keyword(s):  
Induction Time ◽  
Pure Water ◽  
Formation Rate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Gas Absorption ◽  
Obvious Effect ◽  
Gas Uptake ◽  
Gas Consumption ◽  
And Control

Hydrate-based gas separation is a potential technology for CO2 recovery and storage, and its products can be used for fire prevention and control in mines. Promoters are often employed to accelerate or moderate hydrate formation. In this study, experiments were performed to examine the effects of different concentrations of the thermodynamic promoter tetrahydrofuran (THF) and kinetic promoter sodium dodecyl sulphate (SDS) on CO2 hydrate formation under stirring. The results showed that THF significantly shortens the induction time of CO2 hydrates; however, because THF occupies a large cavity in the hydrate structure, it also reduces the gas absorption and hydrate formation rate. SDS has no obvious effect on the induction time of hydrates, but it can increase the gas storage density and hydrate formation rate. Using THF and SDS together consumed more CO2 than using THF alone or pure water. The peak gas consumption rate was 2.3 times that of the THF system. The hydrate formation efficiency was improved by including both THF and SDS, which maximized both the hydrate formation rate and total gas uptake.

Novel Nanostructured Media for Gas Storage and Transport: Clathrate Hydrates of Methane and Hydrogen

2006 ◽  
Vol 4 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Pietro Di Profio ◽  
Simone Arca ◽  
Raimondo Germani ◽  
Gianfranco Savelli
Keyword(s):  
Methane Hydrate ◽  
Large Scale ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Gas Storage ◽  
Structural Features ◽  
Clathrate Hydrates ◽  
Head Group ◽  
Gaseous Fuels ◽  
Kinetic And Thermodynamic Parameters

In the last years the development of fuel cell (FC) technology has highlighted the correlated problem of storage and transportation of gaseous fuels, particularly hydrogen and methane. In fact, forecasting a large scale application of the FC technology in the near future, the conventional technologies of storage and transportation of gaseous fuels will be inadequate to support an expectedly large request. Therefore, many studies are being devoted to the development of novel efficient technologies for gas storage and transport; one of those is methane and hydrogen storage in solid, water-based clathrate hydrates. Clathrate hydrates (CH) are nonstoichiometric, nanostructured complexes of small “guest” molecules enclosed into water cages, which typically form at relatively low temperature-high pressure. In nature, CH of natural gas represent an unconventional and unexploited energy source and methane hydrate technology is already applied industrially. More recently, striking literature reports showed a rapid approach to the possibility of obtaining hydrogen hydrates at room temperature/mild pressures. Methane hydrate formation has been shown to be heavily promoted by some chemicals, notably amphiphiles. Our research is aimed at understanding the basic phenomena underlying CH formation, with a goal to render hydrate formation conditions milder, and increase the concentration of gas within the CH. In the present paper, we show the results of a preliminary attempt to relate the structural features of several amphiphilic additives to the kinetic and thermodynamic parameters of methane hydrate formation—e.g., induction times, rate of formation, occupancy, etc. According to the present study, it is found that a reduction of induction time does not necessarily correlate to an increase of the formation rate and occupancy, and so on. This may be related to the nature of chemical moieties forming a particular amphiphile (e.g., the hydrophobic tail, head group, counterion, etc.). Moreover, a chemometric approach is presented which is aimed at obtaining information on the choice of coformers for H2 storage in hydrates at mild pressures and temperatures.

scholarly journals Chemically Influenced Self-Preservation Kinetics of CH4 Hydrates below the Sub-Zero Temperature

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6765
Author(s):  
Jyoti Shanker Pandey ◽  
Saad Khan ◽  
Nicolas von Solms
Keyword(s):  
Amino Acids ◽  
Natural Gas ◽  
Pure Water ◽  
Hydrate Formation ◽  
The Self ◽  
Gas Uptake ◽  
Formation Kinetics ◽  
Preservation Property ◽  
And Storage ◽  
Kinetics Of

The self-preservation property of CH4 hydrates is beneficial for the transportation and storage of natural gas in the form of gas hydrates. Few studies have been conducted on the effects of chemicals (kinetic and thermodynamic promoters) on the self-preservation properties of CH4 hydrates, and most of the available literature is limited to pure water. The novelty of this work is that we have studied and compared the kinetics of CH4 hydrate formation in the presence of amino acids (hydrophobic and hydrophilic) when the temperature dropped below 0 °C. Furthermore, we also investigated the self-preservation of CH4 hydrate in the presence of amino acids. The main results are: (1) At T < 0 ℃, the formation kinetics and the total gas uptake improved in the presence of histidine (hydrophilic) at concentrations greater than 3000 ppm, but no significant change was observed for methionine (hydrophobic), confirming the improvement in the formation kinetics (for hydrophilic amino acids) due to increased subcooling; (2) At T = −2 °C, the presence of amino acids improved the metastability of CH4 hydrate. Increasing the concentration from 3000 to 20,000 ppm enhanced the metastability of CH4 hydrate; (3) Metastability was stronger in the presence of methionine compared to histidine; (4) This study provides experimental evidence for the use of amino acids as CH4 hydrate stabilizers for the storage and transportation of natural gas due to faster formation kinetics, no foam during dissociation, and stronger self-preservation.

Effect of the foam of sodium dodecyl sulfate on the methane hydrate formation induction time

2017 ◽  
Vol 42 (32) ◽  
pp. 20473-20479 ◽  
Author(s):  
Yong Guo ◽  
Wanfen Pu ◽  
Jinzhou Zhao ◽  
Yuan Guo ◽  
Pian Lian ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Induction Time ◽  
Methane Hydrate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Dodecyl Sulfate

Kinetic analysis of dual impellers on methane hydrate formation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sotirios Nik Longinos ◽  
Mahmut Parlaktuna
Keyword(s):  
Power Consumption ◽  
Kinetic Analysis ◽  
Induction Time ◽  
Methane Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Mixed Flow ◽  
Pitched Blade Turbine ◽  
Decline Rate

Abstract This study investigates the effects of types of impellers and baffles on methane hydrate formation. Induction time, water conversion to hydrates (hydrate yield), hydrate formation rate and hydrate productivity are components that were estimated. The initial hydrate formation rate is generally higher with the use of Ruston turbine (RT) with higher values 28.93 × 10−8 mol/s in RT/RT with full baffle (FB) experiment, but the decline rate of hydrate formation was also high compared to up-pumping pitched blade turbine (PBTU). Power consumption is higher also in RT/RT and PBT/RT with higher value 392,000 W in PBT/RT with no baffle (NB) experiment compared to PBT/PBT and RT/PBT experiments respectively. Induction time values are higher in RT/RT experiments compared to PBT/PBT ones. Hydrate yield is always smaller when there is no baffle in all four groups of experiments while the higher values exist in experiments with full baffle. It should be noticed that PBT is the same with PBTU, since all experiments with mixed flow have upward trending.

Sign in / Sign up

Export Citation Format

Share Document