scholarly journals Thermodynamic Features of the Intensive Formation of Hydrocarbon Hydrates

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3396
Author(s):  
Anatoliy M. Pavlenko
Keyword(s):  
Gas Hydrate ◽  
Formation Rate ◽  
Phase Interface ◽  
Boundary Surface ◽  
Hydrate Formation ◽  
Water Medium ◽  
Gas Temperature ◽  
Mixing Processes ◽  
Gas Hydrate Formation ◽  
Bubble Sizes

This paper presents the results of a study on the influence of pressure and temperature of the gas–water medium on the process of hydrocarbon gas hydrate formation occurring at the phase interface. Herein, a mathematical model is proposed to determine the optimum ratios of pressure, gas temperatures, water, and gas bubble sizes in the bubbling, gas ejection, or mixing processes. As a result of our work, we determined that gas hydrate in these processes is formed at the gas–water interface, that is, on the boundary surface of gas bubbles. Moreover, there is a gas temperature range where the hydrate formation rate reaches its maximum. These study findings can be used to optimize various technological processes associated with the production of gas hydrates in the industry.

scholarly journals Investigation on Gas Hydrates Formation and Dissociation in Multiphase Gas Dominant Transmission Pipelines

2020 ◽  
Vol 10 (15) ◽  
pp. 5052 ◽  
Author(s):  
Sayani Jai Krishna Sahith ◽  
Srinivasa Rao Pedapati ◽  
Bhajan Lal
Keyword(s):  
Crude Oil ◽  
Phase Behavior ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Formation Rate ◽  
Water System ◽  
Hydrate Formation ◽  
Multiphase System ◽  
Gas Hydrate Formation ◽  
Water Cut

In this work, a gas hydrate formation and dissociation study was performed on two multiphase pipeline systems containing gasoline, CO2, water, and crude oil, CO2, water, in the pressure range of 2.5–3.5 MPa with fixed water cut as 15% using gas hydrate rocking cell equipment. The system has 10, 15 and 20 wt.% concentrations of gasoline and crude oil, respectively. From the obtained hydrate-liquid-vapor-equilibrium (HLVE) data, the phase diagrams for the system are constructed and analyzed to represent the phase behavior in the multiphase pipelines. Similarly, induction time and rate of gas hydrate formation studies were performed for gasoline, CO2, and water, and crude oil, CO2, water system. From the evaluation of phase behavior based on the HLVE curve, the multiphase system with gasoline exhibits an inhibition in gas hydrates formation, as the HLVE curve shifts towards the lower temperature and higher-pressure region. The multiphase system containing the crude oil system shows a promotion of gas hydrates formation, as the HLVE curve shifted towards the higher temperature and lower pressure. Similarly, the kinetics of hydrate formation of gas hydrates in the gasoline system is slow. At the same time, crude oil has a rapid gas hydrate formation rate.

scholarly journals Separation Process of Nonpolar Gas Hydrate in Food Solution under High Pressure Apparatus

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yohanes Aris Purwanto ◽  
Seiichi Oshita ◽  
Yasuhisa Seo ◽  
Yoshinori Kawagoe
Keyword(s):  
High Pressure ◽  
Gas Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Separation Process ◽  
Liquid Food ◽  
Screen Size ◽  
Solubility In Water ◽  
Gas Hydrate Formation ◽  
Inner Diameter

Separation process of nonpolar gas hydrate formation in liquid food was experimentally studied under high pressure container. Xenon (Xe) gas was selected as hydrate forming gas and coffee solution was used as a sample of liquid food. The high-pressure stainless steel container having the inner diameter of 60 mm and the volume of 700 mL with a U-shaped stirrer was designed to carry out this experiment. A temperature of 9.0°C and Xe partial pressure of 0.9 MPa were set as a given condition. The experiment was designed to examine the effect of steel screen size, formation rate, temperature condition, and amount of Xe gas dissolving in the solution on the separation process which was indicated by concentration efficiency. Screen size of 200 and 280 mesh resulted in higher concentration efficiency than that of 100 mesh. The higher stirring rate caused the higher formation rate of Xe hydrate and created the smaller Xe hydrate crystals. At the condition giving the same solubility in water, temperature of 14.8°C resulted in lower concentration efficiency than 9.0°C. The increase in the amount of Xe gas dissolving in coffee solution caused the concentration efficiency to decrease; however, the concentration ratio between the final and initial concentration of the solution increased.

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 surfactants and liquid hydrocarbons on gas hydrate formation rate and storage capacity

2003 ◽  
Vol 27 (8) ◽  
pp. 747-756 ◽  
Author(s):  
Zhigao Sun ◽  
Ruzhu Wang ◽  
Rongsheng Ma ◽  
Kaihua Guo ◽  
Shuanshi Fan
Keyword(s):  
Gas Hydrate ◽  
Storage Capacity ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Liquid Hydrocarbons ◽  
Gas Hydrate Formation ◽  
And Storage

Study on Promotion of Surfactant on Gas Hydrate Formation

2013 ◽  
Vol 275-277 ◽  
pp. 2266-2271 ◽  
Author(s):  
Lin Zhang ◽  
En Tian Li ◽  
Shu Li Wang ◽  
Shi Dong Zhou
Keyword(s):  
Natural Gas ◽  
Gas Hydrate ◽  
Storage Capacity ◽  
Formation Rate ◽  
Technical Problem ◽  
Hydrate Formation ◽  
Research Direction ◽  
Transportation Industry ◽  
Natural Gas Hydrate ◽  
Gas Hydrate Formation

Natural gas hydrate has huge gas storage capacity, natural gas hydrate storage and transportation technology opens up a new road for energy storage and transportation industry. The current biggest technical problem is how to improve the hydrate formation rate, to increase storage capacity and form continuously. This paper analyses existing research results, and find that SDS is researched the most widely currently, but there are many insufficient. Specific effects of different surfactants on hydrate formation were summarized, hydrate formation mechanism of surfactants were expounded. The lack of research and the research direction of the future were pointed out. It is thought that further study of surfactant mechanism and build kinetics model containing surfactant have important theory value.

Experimental study and kinetics modeling of gas hydrate formation of methane–ethane mixture

2013 ◽  
Vol 38 (3) ◽  
pp. 273-286 ◽  
Author(s):  
Parisa Naeiji ◽  
Farshad Varaminian
Keyword(s):  
Experimental Data ◽  
Gas Hydrate ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Initial Pressure ◽  
Constant Volume ◽  
Average Error ◽  
Gas Hydrate Formation ◽  
Kinetics Of ◽  
Good Agreement

Abstract. In this study, gas hydrate formation kinetics of methane and ethane binary mixtures has been studied and data of mixed methane–ethane hydrate formation at 0.1, 0.2, 0.3, 0.5, 0.68, 0.8, and 0.9 mole fractions of methane and at a temperature of 277.15 K and an initial pressure of approximately 3.6 MPa were collected. The thermodynamic natural path was used for modeling the hydrate formation rate in a constant volume process. The results show that there is good agreement between model prediction and experimental data, with an average error of 0.9%. It was observed that the values of these parameters are dependent on the concentration of components in the mixtures. The results indicate that this model can predict constant volume experimental data of binary mixture hydrate.

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