Experimental determination of dissociation temperatures and enthalpies of methane, ethane and carbon dioxide hydrates up to 90 MPa by using a multicycle calorimetric procedure

•Methane, ethane, and carbon dioxide gas hydrates were studied by microcalorimetry.•A multicycle method was used to determine dissociation enthalpies up to 90 MPa.•The multicycle method was accurate to determine enthalpies by direct integration.•The conversion of water to hydrate is almost complete using the multicycle method.