Constant-temperature dual-cycle material separation method and use thereof

A constant-temperature dual-cycle substance separation method, comprising:

• carrying out two cycles in a fully-closed treatment system, wherein the two cycles comprise a substance cycle of a thermal control substance, and a substance cycle of a substance to be treated, the substance to be treated comprises a first-phase-transition-temperature component and a second-phase-transition-temperature component, and the thermal control substance has a phase transition temperature between a phase transition temperature of the first-phase-transition-temperature component and a phase transition temperature of the second-phase-transition-temperature component;
• wherein
• the thermal control substance has a temperature higher than a temperature of the substance to be treated,
• the first-phase-transition-temperature component has the phase transition temperature lower than the phase transition temperature of the second-phase-transition-temperature component,
• the substance cycle of the substance to be treated is performed by:
• heating the thermal control substance and then bringing a heated thermal control substance in contact with the substance to be treated for heat exchange, such that phase transition latent heat of the thermal control substance during the heat exchange enables the first-phase-transition-temperature component in the substance to be treated to undergo first-order phase transition and then separation from the second-phase-transition-temperature component, and taking out the first-phase-transition-temperature component after the separation, and
• taking out the second-phase-transition-temperature component after the separation, or introducing the second-phase-transition-temperature component after the separation into a next cycle process as the substance to be treated;
• and
• the substance cycle of the thermal control substance is performed by:
• after heat exchange with the substance to be treated, reheating the thermal control substance by reflux, and then introducing a reheated thermal control substance into a next cycle process.