Methanol and sodium chloride inhibitors impact on carbon dioxide hydrate formation

Abstract

Given the importance of hydrate formation, scientists have studied its nature and dealt with its formation in the operating systems and so far many compounds have been studied and applied in this regard including alcohols and salts. Determining thermodynamic equilibrium conditions for hydrate formation will be the subject of this study and the additives such as methanol, sodium chloride and their mixture within the weight percentages of 5%–20% is used that changes the thermodynamic conditions governing the problem including temperature and pressure and causes the formation pressure of methane and carbon dioxide gas hydrates to be higher than the case without additives.MATLAB and Hydoff software programs are used for solving equations and obtaining the relevant results. The results indicated that the proposed model is capable of anticipating the pure carbon dioxide hydrate formation and also to make sure, the obtained results were compared with the results obtained by the experimental and laboratory in this field and the results indicated that the accuracy of the model is very desirable and could be used in the process and the mentioned conditions with high reliability. Maximum error was 5% and the minimum error with experimental data was 1.55%. Keywords: Hydrates, Carbon dioxide, Temperature, Pressure, Modeling