Abstract

Methane is the smallest and cleanest burning fuel. It is found in the form of natural gas in which methane present in bulk but contains many impurities such as CO2, H2S which must be removed before being used by the consumer. In addition, it must be stored efficiently and transported economically. Gas hydrate is proposed to be one of the methods for storage, transportation and separation. A subclass of hydrate known as semiclathrate hydrate is capable of acting as a sieve for different sized gas molecules and have the capability to cohost smaller guest gases of specific size. Theses semiclathrate hydrate can be very useful for gas storage and multicomponent gas separation. In this work, a family of quaternary-ammonium salts such as tetra n-methyl/n-ethyl ammonium bromide (TMAB/TEAB) from the clan of tetra-alkyl ammonium bromide are examined at concentrations of 5wt% and 10 wt% for their phase stability along with the TBAB. Additionally, non-isothermal kinetics have been studied. Various experimental data have been obtained at different initial pressures of 8 MPa, 7.5 MPa, and 5.5 MPa to find out the influence of alkyl chain length on methane hydrate formation. It can be observed from experiential results that both TMAB and TEAB have shown thermodynamic inhibition as compared to TBAB. It can also be concluded from the phase stability curves that TBAB has more potential to aid in methane storage and separation than TMAB and TEAB at moderate pressure and temperature. An effect of carbon alkyl chain length is clearly seen on methane gas consumption. It has been witnessed that gas storage in hydrate increases with increase in the alkyl chain length of the salts. From this study, TBAB has found to be a more promising agent for gas processing and methane storage in the form of gas hydrate.

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