Effect of Composite Promoting Agents on Gas Hydrate Formation

2012 ◽  
Vol 524-527 ◽  
pp. 1734-1738
Author(s):  
Shu Li Wang ◽  
Ming Jiao Wei ◽  
En Tian Li ◽  
Shi Dong Zhou
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Induction Time ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Liquid Hydrocarbon ◽  
Gas Hydrate Formation ◽  
Dodecyl Sulfate ◽  
Methyl Cyclohexane ◽  
Formation Type

An experiment on effects of composite promoting agents composed of surfactants and liquid hydrocarbons on hydrate formation was conducted and hydrate formation temperature, pressure, induction time and rate with different composite promoting agent portfolios were measured. Surfactants used were sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate(SDBS) and 2-octyl sodium dodecyl sulfate(GC20S), and liquid hydrocarbon additives utilized were ring silane e (CP) and methyl cyclohexane (MCH). It appeared that all these combinations of composite promoting agents could promote hydrate formation. Type II and H hydrate formation conditions with composite promoting agents CP+GC20S and MCH+GC20S respectively were the mildest and the induction time was the shortest.

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

scholarly journals Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2094
Author(s):  
Lu Liu ◽  
Yuanxin Yao ◽  
Xuebing Zhou ◽  
Yanan Zhang ◽  
Deqing Liang
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Induction Time ◽  
Conversion Rate ◽  
High Efficiency ◽  
Low Cost ◽  
Formation Rate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Sem Images ◽  
Dodecyl Sulfate

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, the effect of sodium dodecyl sulfate (SDS) on CO2 hydrate formation from a 3.5 wt.% NaCl solution was measured at 275 K and 3 MPa. X-ray diffraction (XRD) and cryo-scanning electron microscopy (cryo-SEM) were used to measure the crystal structure and micromorphology of the formed hydrates. The results showed that the induction time of CO2 hydrate formation reduced from 32 to 2 min when SDS concentration increased from 0.01 to 0.05%, the hydrate conversion rate increased from 12.06 to 23.32%, and the remaining NaCl concentration increased from 3.997 to 4.515 wt.%. However, as the SDS concentration surpassed 0.05 wt.%, the induction time increased accompanied by a decrease in the hydrate conversion rate. XRD showed that the CO2 hydrate was a structure I hydrate, and SDS had no influence on the hydrate structure. However, cryo-SEM images revealed that SDS promoted the formation of hydrates by increasing the specific surface area of the formed hydrates and folds; rods and clusters could be found on the surface of the CO2 hydrate. Thus, the best SDS concentration for promoting CO2 hydrate formation was approximately 0.05 wt.%; desalination was most efficient at this concentration.

New Insights into the Kinetics and Morphology of CO2 Hydrate Formation in the Presence of Sodium Dodecyl Sulfate

2021 ◽  
Author(s):  
Xiao-Yan Deng ◽  
Ying Yang ◽  
Dong-Liang Zhong ◽  
Xi-Yue Li ◽  
Bin-Bin Ge ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Dodecyl Sulfate

scholarly journals Effect of Propane and NaCl-SDS Solution on Nucleation Process of Mine Gas Hydrate

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Qiang Zhang ◽  
Qiang Wu ◽  
Hui Zhang
Keyword(s):  
Gas Hydrate ◽  
Induction Time ◽  
Equilibrium Points ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Nucleation Process ◽  
Nucleation Kinetics ◽  
Gas Hydrate Formation ◽  
Experimental Apparatus ◽  
Mine Gas

In order to explore the method of accelerating hydration separation process to recover methane from mine gas, propane hydrate phase equilibrium was used to measure the equilibrium points of three kinds of mine gas in NaCl solution. Driving force was set as 1 MPa on this basis and high-pressure experimental apparatus of mine gas hydrate was used to carry out the nucleation kinetics experiments of mine gas hydrate for three gas samples in different concentrations of sodium chloride (NaCl) and sodium dodecyl sulfate (SDS) compound systems, which was to study the effect of propane and NaCl-SDS solution on nucleation process of mine gas hydrate. The results showed that induction time of multicomponent mine gas hydrate formation was shortened with the decrease of methane concentration and increase of propane concentration. The induction time of mine gas hydrate formation was shortened with the reduction of NaCl concentration and the increase of SDS concentration. It was found that methane and propane in multicomponent mine gas nucleated collaboratively, which simplified its nucleation process compared with the single component. NaCl has two kinds of functions.

Formation Kinetics and Self-Preservation of CO2 Hydrates in the Presence of Carboxylated Multiwall Carbon Nanotubes

2021 ◽  
Author(s):  
Khalik Mohamad Sabil ◽  
Omar Nashed ◽  
Bhajan Lal ◽  
Khor Siak Foo
Keyword(s):  
Gas Hydrate ◽  
Induction Time ◽  
Completion Time ◽  
Formation Rate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Significant Finding ◽  
Formation Kinetic ◽  
Gas Hydrate Formation ◽  
The Impact

Abstract Nanofluids are known of having the capability to increase heat and mass transfer and their suitability to be used as kinetic gas hydrate promoters have been recently investigated. They have favorable properties such as high thermal conductivity, large surface area, recyclable, ecofriendly, and relatively cheap that are favorable for kinetic gas hydrate promoters. However, the nanomaterials face challenges related to their stability in the base fluid. Therefore, it is crucial to investigate the impact of surfactant free nanofluid on hydrate formation and dissociation kinetics. In this work, COOH-MWCNT suspended in water is used to study the effect of surfactant free nanofluid on CO2 hydrates formation kinetic and stability. Kinetic study on CO2 hydrates formation as well as self-preservation are conducted in a stirred tank reactor. The kinetic experiments are carried out at 2.7 MPa and 274.15 K. The induction time, initial gas consumption rate, half-completion time t50, semi completion time t95 are measured to evaluate the effect of COOH-MWCNT. Furthermore, the dissociation rate was calculated to assess the impact of COOH-MWCNT on self-preservation at 271.15 K and atmospheric pressure. The results are compared with that of sodium dodecyl sulphate (SDS). The study of CO2 hydrates formation kinetic shows that the induction time is not affected by COOH-MWCNT. The impact of nanofluid is more pronounced during the hydrate growth. The initial formation rate is the highest at 0.01 wt% of COOH-MWCNT whereas 0.01 and 0.03 wt% shows the same and shortest t50. However, t95 found to be decreased with increasing the concentration. The effect of COOH-MWCNT is attributed to the strong functional group. Self-preservation results shows CO2 hydrates are less stable in the presence of COOH-MWCNT. The result of this work may provide significant finding that can be used to developed kinetic gas hydrate promoter based on nanofluid that work better than SDS to eliminate gas hydrate formation in oil and gas pipeline.

Effect of Sodium Dodecyl Sulfate Surfactant on Methane Hydrate Formation: A Molecular Dynamics Study

2018 ◽  
Vol 122 (25) ◽  
pp. 6536-6542 ◽  
Author(s):  
Nilesh Choudhary ◽  
Vrushali R. Hande ◽  
Sudip Roy ◽  
Suman Chakrabarty ◽  
Rajnish Kumar
Keyword(s):  
Molecular Dynamics ◽  
Sodium Dodecyl Sulfate ◽  
Methane Hydrate ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Dodecyl Sulfate
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