Phase diagrams with equilibrium curves (dashed lines) for the system with mixed-hydrate of TBPB + CO₂. A: [T-x] diagram with two 0LG curves (liquid solutions in equilibrium with both solid crystals and gaseous CO₂) at 0.5 and 0.3 MPa. B: [P-T] diagram with four equidistant values of x. Solid arrows: four processes for compressing the three-phase system from 0.3 to 0.5 MPa: LV = isochoric; LX = isosteric; LA = adiabatic; LT = isothermal.