Abstract
The process of hydrate formation of methane in the presence of SAS in the temperature range of 274‒281 K was examined. The aim of the research conducted was to establish the effect of SAS on the process of GH formation, as well as to study kinetic features of their formation in the three-phase system “gas”‒”water+SAS”→”solid body (GH)”. We applied a stalagmometric method with automated photoelectron counting of drops (measurement error is 0.1 %), a conductometric method, with electrical conductivity measured using the Wheatson bridge (measurement error is 0.05–0.1 %). Interphase electric potential was measured by a potentiometric method using the potentiometer PPTV 1. Based on an analysis of the isotherms, by the indicators of surface tension of the aqueous solutions of SAS, we plotted isotherms of surface tension in the logarithmic –lgС SAS coordinates. The isotherms in the region of low concentrations demonstrate a curvilinear section, on which, in accordance with the Gibbs equation, adsorption at the interphase boundary increases with an increase in the concentrations. The curvilinear section of the isotherm passes into a straight line; in this case, the adsorption reaches its maximum value. Based on kink of the isotherm, we determined the value of CMC, which corresponds to the concentration of SAS equal to 1.75–2.00·10 -2 mol/l. The addition of SAS leads to a decrease in the magnitude of CMC. While studying the mechanism of hydrate formation of methane in the presence of SAS, it was discovered that the hydrate formation mechanism includes the following stages: micellization and solubilization. However, an increase in the volume of absorbed methane in the presence of SAS, as well as the activation effect, indicate the micellar catalysis. It is shown that the presence of SAS increases the amount of gaseous methane in GH by several times, as well as improves its quality (friability).
Highlights
Recent years have seen a worldwide trend towards ever-increasing consumption of fuel and energy resources, with a significantly growing interest in non-traditional ways of production of various sources of energy [1,2,3]
It is obvious that there is the need to modernize the structure of coal and oil and gas complexes of the state and to improve a development mechanism of the country’s energy sector, which is possible through the introduction and application of advanced gas hydrate technologies that would enable the possibility of obtaining additional energy resource
The chamber’s body water reacted), we reduced the temperature in the climatic is mounted on a rigid wheelbase frame made of steel profile. chamber and, in the reactor for hydrate formation from 274 to 263‒258 K
Summary
Recent years have seen a worldwide trend towards ever-increasing consumption of fuel and energy resources, with a significantly growing interest in non-traditional ways of production of various sources of energy [1,2,3]. The application of GH for storage or transportation has not been industrially exploited so far They constitute one of the most promising directions in the development of hydrate technologies for modern industry [4,5,6]. Methane, which is released into the mines, hampers production of coal, increasing its cost and worsening the safety of miners’ labor, which is why obtaining GH from the methane of coal mines is very promising [18] This method holds promises for storage and transportation of various gases [19,20,21], such as carbon dioxide [22]. It can be concluded that studying the mechanism of GH formation appears to be one of the most important and relevant tasks
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