(EP531293-A1)      Thermal process to separate fluid mixts., which are not or only slightly absorptive, uses a combination of evapn. and condensn. with an overlaid flow of recirculating neutral gas, passes the cold fluid feed gainst the heated neutral gas flow or against the condensn. flow, in heat exchangers to raise its temp.    The condensn. flow is recirculated through the external heat exchanger and the condenser for the condensed fluid to be taken from the cold end of the evaporator.    Pref., to linearise the enthalpy temp. characteristics of the neutral gas recirculation from the evaporator, a mixed neutral gas flow is passed to the condenser with a stepped increase in the steam content and temps. without heat exchange and without heat exchange with the steam-charged total neutral gas flow, to be heated by the first heat exchanger in the condenser against the neutral gas and steam mixt. or with the condensn. flow with heated fluid. It passes to the second heat exchanger in the evaporator against the neutral gas/stream flow or with the condensn. for heat exchanger.    In the thermal process, the entropy-free energy is returned to the evapn. process through a recuperative heat exchanger, and an external heater provides the temp. for the evapn. process. With an isobar action, there is no neutral gas recirculation, but it is provided for an isothermal action.    ADVANTAGE -   Method gives a conversion of heat into entropy-free useful work with a process for heat insulation derived from the Gibbs-Helmholtz equation of thermodynamics.    (EP531457-A1)      Thermal process to separate fluid mixts., which are not or only slightly absorptive, uses a combination of evapn. and condensn. with an overlaid flow of recirculating neutral gas, passes the cold fluid feed against the heated neutral gas flow or against the condensn. flow, in heat exchangers to raise its temp. The condensn. flow is recirculated through the external heat exchanger and the condenser for the condensed fluid to be taken from the cold end of the condenser, and the enriched mixt. flow from the cold end of the evaporator.    Pref. to linearise the enthalpy temp. characteristics of the neutral gas recirculation from the evaporator, a mixed neutral gas flow is passed to the condenser with a stepped increase in the steam content and temps. without heat exchange and without heat exchange with the steam-charged total neutral gas flow, to be heated by the first heat exchanger in the condenser against the neutral gas and steam mixt. or with the condensn. flow with heated fluid.    It passes to the second heat exchanger in the evaporator against the neutral gas/stream flow or with the condensn. for heat exchange. In the thermal process, the entropy-free energy is returned to the evapn. process through a recuperative heat exchanger, and an external heater provides the temp. for the evapn. process. With an isobar action, there is no neutral gas recirculation, but it is provided for an isothermal action.    ADVANTAGE -   Method gives a conversion of heat into entropy-free useful work with a process for heat insulation derived from the Gibbs-Helmholtz equation of thermodynamics.    (EP531293-B1)      Thermal process featuring neutral gas circulation designed to separate sorptive liquid mixtures, combining evaporation of the mixture in an evaporator (10) in the presence of a vapour-bearing neutral gas (16) with partial recondensation in a condenser (11) of the evaporated component of the mixture (19), partial recondensation in a resorber (12) of the residual vapour carried by the neutral gas (16) in the in flowing mixture (17), and recondensation in an absorber (13) of the residual vapour remaining in the neutral gas (16) after the resorption process in a recycled portion (18.2) of the liquid component (18) of the separated mixture, whereby the vapour-bearing neutral gas (16) flows through the evaporator (10), the resorber (12) and the absorber (13) with a linearised temperature-enthalpy characteristic in the opposite direction to the associated liquids (20, 17, 18.2) and the mass flow of the neutral gas (16) progressively decreases as it takes up vapour in the evaporator (10) and progressively increases as it sheds vapour beginning in the resorber (12) and ending in the absorber (13), with individual vapour-saturated portions of the neutral gas flow being extracted from the evaporator (10) with progressively increasing vapour content levels and passed to points in the resorber (12) and the absorber (13) which are at the same temperature and partial vapour pressure and with the total flow of vapour-depleted neutral gas (16) which has been routed back into the evaporator (10) being brought back into contact with the evaporating mixture (20), whereby the cold inflowing mixture (17) is routed through a counterflow heat exchanger (14) and the condenser (11) as a recuperative cooling agent to carry off waste heat, the recycled portion (18.2) of the liquid component (18) of the separated mixture is routed first through the absorber (13) as a liquid sorbent for heat and vapour and then, together with the recuperatively preheated inflowing mixture, through the resorber (12) as a liquid sorbent to heat and vapour, and the outflowing mixture (20) leaving the resorber (12) is fed into the evaporator (10) and this outflowing mixture (20) is heated by a heat source (15), whereby the condensed vapour and the unevaporated portion (18.1) of the mixture are drawn off at the cold end of the counterflow heat exchanger (14).