CARBON DIOXIDE HYDRATE PHASE EQUILIBRIUM IN THE PRESENCE OF THERMODYNAMIC INHIBITORS

AMANDA ZORZI GUEMBAROSKI¹; MOISES ALVES MARCELINO NETO¹; RIGOBERTO ELEAZAR MELGAREJO MORALES¹

¹ UTFPR

doi:10.20906/CPS/CON-2016-1588

Resumo

Hydrates are crystalline compounds formed by occlusion of gas or liquid of low molecular mass inside a crystalline structure consisting of water molecules. Hydrates can block oil and gas lines in petroleum industry, reducing process efficiency, damaging equipments and risking safety operation. In order to inhibit the formation of hydrates, the industry injects thermodynamic inhibitors, such as alcohols and salts. In this study, three-phase equilibrium conditions of hydrate-liquid-vapor (HLWV) were experimentally determined for carbon dioxide hydrate inhibited with ethanol and sodium chloride at temperatures ranging from (275.65 to 281.65) K and pressures up to 3.5 MPa. Three commercial packages (Multiflash and CSMGem) to predict hydrate formation for these systems were examined and compared with experimental results. The agreement between the experimental and the predicted dissociation pressure calcutated was generally found to be acceptable.

Palavras-chave: hydrates; inhibitor; equilibrium data; commercial packages