|
چکیده
|
The formation of gaseous (gas) hydrates for storage, separation and transportation application is essential. In this regard, a comprehensive study of this case is essential. Semi-clathrate hydrates have higher temperature stability and are formed in a stable range. The purpose of this study is review the experimental and modeling of the semi-clathrate hydrates, to investigate the equilibrium conditions for the formation/dissociation of them based on the type of thermodynamic promoters like TBAB, TBAC, TBAF, TBANO3 and TBP groups. This review is consist of 4 overall section, at frst an introduction to semiclathrate hydrates has defned. After that, the experimental research has discussed through diferent gas systems such as CO2, CH4, N2, H2 etc. Also, the target of each study, like the CO2 capture, separation of CH4, formation/dissociation equilibrium conditions, are expressed. Then, in the modeling section, the diferent types of thermodynamic modeling like, equaling fugacity, intelligence computing, Gibbs free energy minimization and Chen-Guo method are collected. At fnal section, a comparison between types of promoter showed that the addition of TBAF to aqueous solution has the best promotion efect on the CO2 clathrate hydrate formation. Also, the results of comparing the concentration of promoters have shown that up to a certain amount of TBAB, the salt’s role as a promoter and by addition concentration of promoter, has an inhibition efect. Also, besides the results of the comparison diferent promoters on equilibrium conditions of diferent gaseous hydrates, have indicated that, TBAB has the most signifcant impact on carbon dioxide hydrate.
|