Abstract: An absorbent solution for an absorption refrigeration apparatus is composed of water as a refrigerant and an absorbent. The absorbent is a mixture of at least three lithium compounds selected from the group consisting of lithium bromide, lithium iodide, lithium chloride, and lithium nitrate. The mixture ratio of, for example, lithium bromide to lithium iodide to lithium chloride in the absorbent is 1:0.1-1.0:0.05-0.50. Therefore, since absorption temperature sufficiently higher than crystallization temperature can be achieved, neither lithium halide nor lithium nitrate is precipitated in the absorbent solution during the operation cycle of the refrigeration apparatus.

Abstract: A method of transferring and recovering energy comprises placing in different reactors two or more different solid adsorbents having a gaseous reactant adsorbed thereon and each having a different gaseous reactant vapor pressure, in a first reaction cycle, pressurizing a first portion of the reactors at a first pressure to desorb the gaseous reactant in an endothermic reaction, and pressurizing a second portion of the reactors at a second pressure to adsorb the gaseous reactant in an exothermic reaction, and in a second reaction cycle, pressurizing the first portion of the reactors at the second pressure to adsorb the gaseous reactant in an exothermic reaction, and pressurizing the second portion of the reactors at the first pressure to desorb the gaseous reactant in an endothermic reaction, and directing at least a portion of the heat released during the exothermic reactions or at least a portion of heat adsorbed during the endothermic reactions to heat exchange means for energy recovery.

Abstract: An improved thermal energy transfer apparatus and associated working fluid employs a supersonic compressor in place of a conventional turbine-compressor unit within a Rankine heat engine powering a vapor compression heat pump. The compressor comprises a supersonic nozzle having an inlet section which converges to a throat region from which a diverging outlet section extends. The inlet section is coupled in the fluid flow path of the heat engine at the boiler outlet, while its outlet section is coupled to a downstream condenser. The working fluid from the evaporator of the heat pump is entrained at a point downstream of the throat region where the pressure in the nozzle is lower than the pressure at the exit of the evaporator. The pressure of the second working fluid from the heat pump is lower than that of the exiting fluid (and the input fluid from the heat engine).

Abstract: Device for producing cold and/or heat by a solid gas reaction comprising a first and a second reactor each of which contains a salt capable of reacting by absorption with a gas by an exothermic reaction, the first reactor being in communication in a first operating stage with an enclosure intended to retain the gas, the second reactor being in communication, in the first operating stage, with an enclosure intended to release the gas, according to the invention, each reactor comprises a different salt. A device comprising four reactors provided with three different salts is also described.

Abstract: A method of transferring and recovering energy comprises placing in different reactors two or more different solid adsorbents having a gaseous reactant adsorbed thereon and each having a different gaseous reactant vapor pressure, in a first reaction cycle, pressurizing a first portion of the reactors at a first pressure to desorb the gaseous reactant in an endothermic reaction, and pressurizing a second portion of the reactors at a second pressure to adsorb the gaseous reactant in an exothermic reaction, and in a second reaction cycle, pressurizing the first portion of the reactors at the second pressure to adsorb the gaseous reactant in an exothermic reaction, and pressurizing the second portion of the reactors at the first pressure to desorb the gaseous reactant in an endothermic reaction, and directing at least a portion of the heat released during the exothermic reactions or at least a portion of heat absorbed during the endothermic reactions to heat exchange means for energy recovery.

Abstract: A method of transferring and recovering energy comprises selecting a plurality of two or more different compounds comprising a solid reactant adsorbent and a gaseous reactant adsorbed thereon, each of said compounds having a different gaseous reactant vapor pressure, substantially independent of the concentration of the gaseous reactant, locating a first set of the different compounds in a first reactor and a second set of the different compounds in a second reactor, pressurizing the first reactor at a first pressure and the second reactor at a second pressure, supplying a heat transfer fluid at a first temperature along the first reactor in thermal communication with the first set of compounds, whereby said compounds desorb said gaseous reactant in endothermic reactions, supplying a heat transfer fluid at a second temperature, typically lower than the first temperature, along second reactor in thermal communication with the second set of compounds, whereby the compounds adsorb the gaseous reactant in exother

Abstract: Apparatus and process are disclosed for increasing the quantity of heat exchange possible between the temperature overlap portions of a generator and an absorber in an absorption cycle compressor or heat pump. Referring to FIG. 1, the heat duty of Generator-Absorber Heat Exchange (GAX) absorber 4 is increased and the heat duty of GAX desorber 6 is decreased by branching sorbent flow from absorber 4 at point 7, and circulating the branch flow by pump 10 to externally-heated desorber 1.

Abstract: An absorption apparatus comprising a housing and an absorber contained within the housing for producing a strong refrigerant solution. A generator refrigerant reservoir is situated in the bottom of the housing for producing a rising refrigerant vapor. A condensor is situated in the top of the housing for condensing the refrigerant vapor into a refrigerant liquid. An evaporator is disposed underneath the condensor in the housing for receiving the refrigerant liquid from the condensor and vaporizing the same to create a refrigerant effect. The absorption apparatus additionally comprises a pump for pumping the strong refrigerant solution from the absorber to the generator refrigerant reservoir. A process for producing a refrigerant effect within a housing comprising producing a strong refrigerant solution by an absorber contained within the housing, and also producing a rising refrigerant vapor from a generator refrigerant reservoir positioned within the housing.

Abstract: A method of dehumidifying gas in which gas is brought into direct contact with an absorption liquid in one or more stages, and in which the absorption liquid in at least one stage comprises a salt solution which includes an amount of salt crystals so that the concentration of the salt solution will not be substantially reduced in the absorption stage.

Abstract: A device for producing cold between +10.degree. C. and -40.degree. C., particularly in transport vehicles comprises at least one reactor (R), a condenser (C), a gas collector (Co) and an evaporator (E). The following simultaneous reactions are produced in the reactor (R): ##EQU1## the symbols < >; [ ] and ( ) denoting the solid, liquid and gaseous states respectively, X being chosen from ZnCl.sub.2, CuSO.sub.4, CuCl, LiBr, LiCl, ZnSO.sub.4, SrCl.sub.2, MnCl.sub.2, FeCl.sub.2, MgCl.sub.2, CaCl.sub.2, and NiCl.sub.

Abstract: A hermetically closed circulation type, vapor absorption refrigerator which comprises a high temperature regenerator, a low temperature regenerator a condenser, an evaporator, an absorber and heat exchangers in a hermetically closed circulation system as essential constituent members composed of iron-based materials, where refrigeration is produced by repetitions of concentration of an absorbing solution sealed into the circulation system, dilution with a cooling medium and heat exchange, the inside wall of the high temperature regenerator being provided with a composite film of molybdenum oxides and iron oxide can be operated stably with a high reliability or corrosion resistance.

Abstract: An air conditioning process and apparatus with absorption of water vapor in a circulating absorption liquid containing an aqueous salt solution. The absorption liquid to be supplied to the absorber is cooled by indirect contact with a circulating water stream in a heat exchanger. The circulating water is expanded at reduced pressure to release water vapor and lower the temperature of the water. The water vapor is thereafter absorbed in absorption liquid from the absorber.

Abstract: An air conditioning process and apparatus includes absorption of water vapor in a circulating absorption liquid composed of an aqueous salt solution. The absorption liquid is regenerated by evaporative concentration by indirect heat exchange with a heating fluid in an evaporator. The water vapor produced in the evaporator is condensed in a condenser by indirect heat exchange with a cooling liquid which is mainly composed of the absorption liquid to be concentrated or which has already been concentrated in the evaporator. The water vapor pressure over the cooling liquid in the condenser is lowered by causing gas to flow in contact with the cooling liquid.

Abstract: An absorption type refrigerator has an aqueous absorbing solution. The absorbing solution comprises lithium bromide solution, 5-150 ppm by weight of NO.sub.3.sup.- and 0.1-0.4% by weight of LiOH, and is free from any triazole compounds. The absorbing solution further includes octyl alcohol.

Abstract: An improved heat exchange system incorporates the cooling created by using a metal salt/ammonia ligand complex compound which is alternately heated and cooled to alternately desorb and adsorb, respectively, the ammonia creating useful cooling or refrigeration in the temperature range of between -65.degree.C. to 15.degree. C.

Abstract: A system for storing chemical energy comprises first and second vessels, the first containing a liquid solution of an alkali or alkaline earth metal hydroxide, halide, or thiocyanate, or ammonium halide or thiocynate at an initial concentration of between about 30% to abotu 80%, by weight, the second vessel containing liquid, a space about the liquid in each vessel and a conduit communicating between the spaces having a valve for selectively allowing liquid vapor to pass between the spaces, means for heating the solution to a temperature above about 80.degree. F., means for cooling the liquid to a temperature below about 55.degree. F., and heat exchange means for transferring heat from the heated solution and for transferring heat to the cooled liquid. Water is the preferred liquid although ammonia, lower alcohols, and polyols such as glycerol, glycols, polyglycols, glycol ethers, lower aliphatic amines and alkanol amines, and mixtures thereof, may be used.

Abstract: A unique refrigerant containing three or more halocarbons, each halocarbon after the first having a successively higher boiling point. The refrigerant has a temperature/pressure relation substantially equal to FC-12. Also provided is a method for producing cooling and a method for producing heating using this refrigerant.

Abstract: A new absorbent for water vapor is disclosed which is non-oxidizing and is suitable for use as the absorption working pair in combination with H.sub.2 O in absorption heat pumps, and also as a liquid drying agent. The absorbent is comprised of a mixture of at least two alkali metal thiocyanates, preferably KCNS and NaCNS. The preferred weight ratio is between 3 and 4, which remains liquid at all water vapor pressures above 1/16 ATA (curve "30 Na" on the Figure). Further advantages are obtainable by incorporating at least one of lithium cations, cesium cations, and hydroxide anions in the absorbent mixture.

Abstract: The invention provides a working fluid for an absorption refrigeration, cooling or heating system comprising a mixture of dimethyl formamide and N-methyl-2-pyrrolidone as the absorbent therein.

Abstract: Thermotransformer for storing and unstoring heat with a double raise in thermal potential by performing thermo-chemical processes that present Clapeyron curves that intersect in the temperature range involved, this device being applicable to heat pumps and the handling of thermal energy.

Abstract: An absorbent solution for absorbing and desorbing useful quantities of ammonia vapor is disclosed. The absorbent has much lower vapor pressure than water, and has a wider solubility field and higher crystallization limit than any previously known non-volatile absorbent for ammonia. It is useful in absorption cycle processes and apparatus requiring high lifts from temperatures well below freezing, e.g., in thermally actuated industrial refrigeration systems or cold-climate absorption heat pumps for space heating. The new absorbent is also useful with other ammonia-type vapor, e.g., monomethylamine.

Abstract: An absorbent in a solution which comprises at least one of bromides taking a dihydrate form at room temperature and at least one of halides taking a hexahydrate form at room temperature has a high solubility and a low cost, and is used in a closed, cyclic absorption-type refrigerator.

Abstract: Extended period cooling packs are provided by employing reaction mixtures of coated particulate matter and a liquid reactant, where the liquid reactant reacts with the particulate matter in an endothermic reaction. The coating acts to slow the rate of reaction between the reactants, so as to extend the period of cooling.

Abstract: The pair of substances for absorption heat transformers consists of methanol and tetraethylene glycol dimethyl ether.

Abstract: A method for transforming heat to a higher temperature and a heat transformer. By supplying heat of intermediate temperature T.sub.1 to a solid adsorbent at a low pressure, a previously adsorbed working fluid is desorbed from the solid adsorbent. The generated working fluid vapor is transformed to a liquid phase at a lower temperature T.sub.0 while releasing the phase changed heat. At relatively high pressure, heat is supplied to a liquid phase of the working fluid, which is transformed to the gaseous phase, which is then adsorbed in a solid adsorbent while liberating the heat of adsorption. The process is continued by alternately regenerating/saturating the solid adsorbent. The use of an absorbent fluid for changing the phase of the working fluid allows higher output temperatures and choice of the pressure levels used. An internal heat exchange method is included for the efficient use of the sensible heat of the solid adsorbent in systems with two or more containers with solid adsorbent.

Abstract: This invention relates to a cooling and heating system which operates on the absorption and phase change heat exchange principle. More particularly it relates to a continuous heat actuated, air cooled, double effect generator cycle, absorption system. In further aspects, this invention relates to a system constructed for use with an absorption refrigeration solution pair consisting of a nonvolatile absorbent and a highly volatile refrigerant which is highly soluble in the absorbent. A disclosed refrigerant pair are ammonia as the refrigerant and sodium thiocyanate as the absorbent. An absorption cycle is disclosed using the thermo physical properties of sodium thiocyanate/ammonia, absorption/refrigerant pair.

Abstract: The invention provides a liquids recovery process useful for the separation and recovery of C.sub.3.sup.+ liquid hydrocarbons from gas mixtures containing high concentrations of lighter components such as are produced by the dehydrogenation of liquefied petroleum gases or by the catalytic cracking of heavy oils. The recovery process employs an absorption refrigeration cycle to supply high level refrigeration to the process; the absorption cycle utilizes low pressure steam or a heated fluid derived from secondary heat recovery of a process flue gas to effect heating in the absorption refrigeration cycle.

Abstract: The present invention relates to stable mixtures comprising a chlorofluorohydrocarbon as a heat transfer fluid, an amide or glycol ether compound as a solvent, and a zinc dialkyldithiophosphate as a stabilizer. The invention also relates to the use of these mixtures as heat transfer compositions for absorption heat pumps.

Abstract: Working fluid/solvent compositions for use in absorption heating and cooling equipment, which compositions comprise a chlorofluoroethane with a boiling point between -40.degree. and +50.degree. C. and at least one solvent with a boiling point above 100.degree. C., the solvent being at least one material having the formula:C.sub.m Cl.sub.2m+1 --(CF.sub.2 --CFCl).sub.n --Xwherein m is zero or one, n is an integer from one to four, and is at least two when m is zero, and X is hydrogen or chlorine, X being hydrogen only when m is one.

Abstract: A combined intermittently operated heat pump device which comprises n combinations (n being an integer equal to or greater than 2) of intermittently operated heat cycles, each combination comprising of vessels accommodating therein different kinds of absorbent material having different temperature and pressure characteristics and coupled with each other by means of a piping through which a common working medium can flow. The 2n batches of the absorbent materials in the respective vessels include at least n+1 kinds of the absorbent material having different temperature and equilibrium pressure characteristics, at least one temperature of heat of absorption in one of the cycles being selected to be higher than the temperature of heat of desorption in at least one of the remaining cycles.

Abstract: Heat and/or cold are produced in an absorption heat converter operated with a solvent and at least two distinct working fluids condensed and vaporized in a temperature range, whereby the yield is increased.

Abstract: A water vapor absorbing composition containing CsOH is disclosed which is useful in absorption cycle heat pumping processes and apparatus. When combined with at least one of KOH and NaOH, the absorbent makes possible exceptionally high lifts of the temperature of heat which is initially at low ambient temperatures. Acceptably low corrosion rates are achieved with standard materials of construction using ordinary corrosion inhibitors.

Abstract: Compositions for use as fluids in absorption heat pumps, which compositions comprise a chlorofluoro-hydrocarbon heat exchange fluid, an amide or glycol-ether solvent vehicle, and at least one metal salt of an alkylarylsulfonate which stabilizes the fluid against decomposition, together with use of the compositions in absorption heat pumps.

Abstract: A method and device are provided for increasing the temperature of heat. By supplying heat at a temperature T.sub.2 to a solid adsorbent, a working fluid is desorbed from this adsorbent at a relatively high pressure. The evolving gaseous working fluid is transformed to a liquid phase at a temperature T.sub.1 ' (T.sub.1 ' T.sub.2) while liberating heat. The working fluid is then transformed to the gaseous phase at a lower temperature T.sub.0 and a lower pressure p.sub.0 while heat is supplied. The generated gaseous working fluid is absorbed in a second adsorber/generator in a solid adsorbent. The absorber/generators periodically change between the adsorption and desorption phase and are operated in opposite phases. Before an interchange of the function of the two adsorber/generators, an internal heat exchange is carried out. The internal heat exchange includes a pressure equalization step with a subsequent heat transfer by a heat transfer loop.

Abstract: The invention provides an absorption-refrigeration system including:generator means in which the vapor of a volatile refrigerant, dissolved in n absorbent, is driven off the absorbent by heat exchange with a source of thermal energy;condenser means in which the refrigerant vapor is turned into liquid refrigerant;evaporator means in which the liquid refrigerant is turned into refrigerant vapor by heat exchange with the substance to be refrigerated, andabsorber means in which the refrigerant vapor is redissolved in the absorbent to be recycled,characterized in that the refrigerant is selected from the group of fluoro-and fluoro-chloro-hydrocarbons, that the absorbent is an organic polar solvent possessing a strong chemical affinity with respect to the refrigerant, and that at least one of the heat exchanges involves direct contact between the partners to the heat exchange, which partners are mutually non-reactive and non-miscible.

Abstract: Disclosed is a method and apparatus for refrigeration utilizing a combined mechanical and absorption cycle. Two immiscible or only partly miscible refrigerants are mixed and evaporated in an evaporator to cool a process stream. The refrigerants are separated in an absorber which absorbs one of the refrigerants from the vapor mixture. The non-absorbed refrigerant vapor is compressed and condensed, while the absorbed refrigerant is desorbed and condensed to produce respective liquid refrigerant streams to the evaporator. Optionally the vapor mixture from the evaporator is compressed in a first stage of compression prior to passing to the absorber.

Abstract: An absorption heat pump wherein the working fluid is a fluoroalkylamine of the formula: ##STR1## wherein each of X and X.sup.1, independently, represents hydrogen or fluorine,R represents hydrogen or a lower alkyl radical,n represents an integer from 1 to 4, each of m and q represents an integer from 0 to 2,p represents an integer from 0 to 4 provided that p is not zero when X.sup.1 is fluorine, and r represents an integer from 1 to 3, the fluoroalkylamine having a maximum of 6 carbon atomsand the solvent is a phenol.

Abstract: A chemisorption thermal system provides a cooling output by revolving an array of thermal elements through heat sink and heat source temperature zones defined within a cylindrical housing. Each thermal element is an enclosed elongated body having an absorbent material at one end and a reactant containing part at the other end. Reactant is desorbed from the absorbent material in one part of the thermal cycle, and then evaporated from the reactant containing part to provide a cooling output in another part of the cycle. It is particularly suitable as a vehicle air conditioner using the engine waste heat as a heat source and the vehicle radiator as a heat sink. The invention also makes use of dry chemical absorbent materials which have high heats of reaction allowing the system to have a high heat capacity and low volume. The thermal cycle may be reversed to provide a heating output.

Abstract: This invention is a process for formation of a gas hydrate to be used as a cool storage medium using a refrigerant in water. Mixing of the immiscible refrigerant and water is effected by addition of a surfactant and agitation. The difficult problem of subcooling during the process is overcome by using the surfactant and agitation and performance of the process significantly improves and approaches ideal.

Abstract: The air conditioning apparatus according to the invention comprises an absorption type heat pump comprising a system including an absorber, a regenerator, a condenser and an evaporator. A mixture of lithium bromide and zinc chloride is used as an absorbent which is dissolved to form an absorbent solution into a mixed solvent having a ratio by weight of methanol to water, the ratio falling in a range between 0.1 and 0.3. Said solution is circulated through the system.

Abstract: An absorption type heat transfer and thermally powered temperature pressure potential amplifier system for storing energy by distilling and separating solute from a solution of the solute and a solvent at a low temperature, then amplifying and recovering the temperature and/or vapor pressure potential difference between the solute and the solution at a higher temperature in the form of heat transfer or its mechanical power equivalent. One working fluid is a solute having a low boiling point, the other a solution of the solute in a solvent having a high boiling point such that mutual solubility is poor at low temperatures as indicated by a small vapor pressure difference between solute and solution, and in which the vapor pressure difference between solute and solution greatly increases at higher temperatures. This permits the vapor pressure potential difference to be released in the form of mechanical work when vapor from separated solute is reabsorbed into solution in an absorber at the higher temperature.

Abstract: A high efficiency space conditioning process and apparatus for heating and cooling utilizing an absorption cycle in the nature of absorption heat pumps for heating and cooling. The invention provides a process and apparatus having a higher Coefficient of Performance than conventional absorption heat pumps by utilization of a substantially saturated salt solution cycle between at least one pair of: (1) an absorber and generator, or (2) a condenser and evaporator, wherein the salt is crystallized to the solid phase in the generator or evaporator, respectively, and the heat of crystallization is utilized for refrigerant vaporization occurring simultaneously.

Abstract: The present invention relates to a method of using and storing energy from the environment using a storage medium, especially silica gel or zeolite, which works by means of chemical reactions or sorptions, in which during charging with energy exergy is accumulated to a high density in this storage medium via an inert gaseous carrier medium for the exergy, and during discharging the stored exergy is extracted from the store, as required, also by means of an inert gaseous carrier medium for conversion into heat or cold of the desired level. The method of the present invention is carried out in such a way that:(a) on charging with energy the exergy of smaller imbalances of the environment is accumulated and/or(b) on discharging energy the residual exergy contained in the emerging gaseous inert carrier medium is used for charging a further storage medium, in which no or only a little exergy is accumulated.

Abstract: Phosphoric acid, especially orthophosphoric acid, is employed as the absorption medium in an absorption heat pumping system using water as its working medium. The acid may contain additions of corrosion inhibitors and/or boiling point elevating agents if desired.

Abstract: This invention relates to a highly efficient refrigeration system and process, employing two absorption refrigeration cycles in series operation, the first cycle comprising an ammonia-aqueous ammonia system and the second cycle comprising a novel absorption system and process, driven by low-grade heat and operated at pressures substantially below atmospheric, which provides cooling at temperatures as low as about -12.degree. C. to about +15.degree. C. Solutions of normally liquid, mutually soluble compounds, having substantially different boiling points, are employed as refrigerant and absorbent. Typically, the absorbent comprises a distillation bottoms fraction containing from about 65 to about 95 mole % of the higher-boiling compound and the refrigerant comprises a distillation overhead fraction containing from about 93 to about 99 mol. % of the lower-boiling compound. Heat pumped up in the first ammonia cycle is absorbed in the second cycle by refrigerant at the coolant temperature achieved therein.

Abstract: This invention relates to a highly efficient refrigeration system and process, driven by low-grade heat and operated at pressures substantially below atmospheric, which provides cooling at temperatures generally within the range from about -12.degree. to about +15.degree. C. Solutions of normally liquid, mutually soluble compounds, having substantially different boiling points, are employed as refrigerant and absorbent. Typically, the absorbent comprises a distillation bottoms fraction containing from about 65 to about 95 mol. % of the higher-boiling compound and the refrigerant comprises a distillation overhead fraction containing from about 93 to about 99 mol. % of the lower-boiling compound. Multi-effect modes may be employed.

Abstract: The invention comprises solution compositions suitable for absorbing and desorbing useful quantities of water vapor at high boiling point elevations, and, hence, which are useful in conjunction with H.sub.2 O as the absorbent pair in absorption cycle heat pumps. The nonaqueous component of the solution is comprised of at least 35 mole percent LiNO.sub.3 and at least 35 mole percent alkali nitrite. The absorbent is particularly useful in high temperature absorption cycles, i.e., with maximum temperatures in the range of 130.degree. C. to 260.degree. C. or even higher.

Abstract: A process for cold and/or heat production using carbon dioxide, a solvent for carbon dioxide and a condensable fluid (F), comprising conducting an absorption/condensation step wherein carbon dioxide is absorbed in the solvent and the gaseous fluid (F) is condensed, a step of separation of the resultant liquid phases, a desorption step for the CO.sub.2 solution, a mixing step and an evaporation step for the condensed fluid (F).

Abstract: An absorption type heat pump system including a first heat pump of the absorption type and a second heat pump of the absorption type. The first heat pump includes a generator equipped with a heating source, a condenser, an evaporator, an absorber, and a solution heat exchanger for drawing off hot water from the condenser and the absorber for heating and hot water supply purposes. The second heat pump includes a generator equipped with a heating source, a condenser, an evaporator, an absorber and a solution heat exchanger. The condenser and the absorber of the second heat pump are mounted in the evaporator of the first heat pump and the first and second heat pumps are connected together, so as to absorb heat from atmosphere by the evaporator of the second heat pump and utilize as a heat source for vaporizing a refrigerant in the evaporator of the first heat pump the heat given off by the condenser and the absorber of the second heat pump.

Abstract: Process for producing cold and/or heat, making use of an absorption cycle and wherein carbon dioxide is the working fluid, comprising the steps of:(a) heating a solution L.sub.1 of carbon dioxide in a liquid solvent so as to obtain a carbon dioxide gaseous phase G.sub.1 and a desorbed liquid phase S.sub.1,(b) dissolving said gaseous phase in a liquid solvent S.sub.2 therefor while removing the evolved heat,(c) heating under reduced pressure the solution obtained in step b so as to desorb a carbon dioxide phase G.sub.2 therefrom and form a desorbed liquid phase S.sub.3,(d) admixing S.sub.1 and G.sub.2 at the pressure level of G.sub.2 while removing heat and increasing the pressure of the resulting solution L.sub.3 to the pressure of L.sub.1 and recycling it at least partially to step a, and(e) recycling at least a portion of S.sub.3 to step b after recompression to the pressure level of G.sub.1, in order to reconstitute S.sub.2.