Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/08—Materials not undergoing a change of physical state when used
  • C09K5/10—Liquid materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
  • C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
  • C07D233/56—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
  • C07D233/58—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring nitrogen atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/02—Materials undergoing a change of physical state when used
  • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
  • C09K5/048—Boiling liquids as heat transfer materials
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/02—Materials undergoing a change of physical state when used
  • C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
  • C09K5/066—Cooling mixtures; De-icing compositions

Definitions

• the present invention relates to ionic liquids which are useful for cooling in high temperature environment.
• an ionic liquid is a salt in the liquid state, more particularly a melt of a low melting salt, e.g. with a melting point equal or below 100° C.
• a melting point equal or below 100° C.
• Such ionic liquids may exhibit some very interesting characteristics, e.g. having a very low, virtually non measurable vapor pressure, a large liquidus range, good electrical conductivity and interesting solvation characteristics. These characteristics make ionic liquids prone for several applications, e.g. as solvents (for example, in organic or inorganic synthesis, transition metal catalysis, biocatalysis, multiphase reactions, photochemistry, polymer synthesis, and nanotechnology), extracting agent (e.g.
• liquid-liquid or liquid gaseous extraction for example, in batteries, fuel cells, capacitors, solar cells, sensors, electroplating, electrochemical metal processing, electrochemical synthesis, and nanotechnology
• electrolytes for example, in batteries, fuel cells, capacitors, solar cells, sensors, electroplating, electrochemical metal processing, electrochemical synthesis, and nanotechnology
• lubricants for example, in batteries, fuel cells, capacitors, solar cells, sensors, electroplating, electrochemical metal processing, electrochemical synthesis, and nanotechnology
• lubricants for example, in batteries, fuel cells, capacitors, solar cells, sensors, electroplating, electrochemical metal processing, electrochemical synthesis, and nanotechnology
• lubricants for example, in batteries, fuel cells, capacitors, solar cells, sensors, electroplating, electrochemical metal processing, electrochemical synthesis, and nanotechnology
• lubricants for example, in batteries, fuel cells, capacitors, solar cells, sensors, electroplating, electrochemical metal processing, electrochemical synthesis, and nanotechnology
• lubricants for example, in batteries,
• ionic liquids for use as a cooling medium are disclosed. It is described that ionic liquids are exclusively composed from ions (cations and anions) and are salts that are liquid at temperatures below 100° C. without the salts being dissolved in a solvent such as water.
• Cations according to WO 2010/136403 include imidazolium, pyridinium, pyrrolidinium, guanidinium, uronium, thiouronium, piperidinium, morpholinium, phosphonium or ammonium, which cations additionally can be alkylated and anions include sulfates, phosphates, halides, fluorinated anions such as tetrafluoroborate, hexafluoroborate, trifluoroacetate, trifluoromethanesulfonate and hexafluorophosphate, sulfonates, phosphinates or tosylates.
• ionic liquids do have virtually no vapor pressure and are therefore generally non flammable below their high thermal decomposition point of up to 300° C. and even more. When heated up above their thermal decomposition temperature, however, they form gaseous, molecular decomposition products, which are flammable.
• a typical ionic liquid starts to burn after the bulk phase has reached the flashpoint temperature and that in many cases the combustion only continues, if a quite high input of external heat from a heat source is given.
• ionic liquids do not form a highly explosive mixture of hydrogen and oxygen (detonating gas or oxyhydrogen gas) when in contact with hot (reducing) surfaces or hot (reducing) melts at temperatures above approx. 500° C. That is in contrast to water, which still is widely used as cooling agent.
• Drawbacks of ionic liquids in contrast to water may be the higher viscosity in the range of typically some 10 to some 100 mPas at 20° C. and a specific heat capacity of approx. 50 to 75% of water.
• ionic liquid cooling media generally are superior to water or thermo oils as cooling agents in terms of safety. However, if ionic liquids are heated above their thermal decomposition point, they still form flammable or non flammable gaseous products, which will lead to an increase or even hazardous increase of pressure in a closed cooling system. In the case of an accidental efflux by e.g. disruption of a pipe into e.g. a molten metal it will cause heavy sputtering or even minor explosions.
• cooling media comprising ionic liquids with 8,5 weight % of hydrogen or less, show much lower, or even practically no sputtering or explosive reaction behavior in contrast to ionic liquids (and other cooling media) with higher hydrogen content.
• hydrogen denotes hydrogen atoms bound to other atoms e.g. carbon atoms, being part of the ionic liquids anions or cations or being part of ionic or molecular byproducts or additives, but not gaseous hydrogen.
• the content of carbon atoms or other atoms forming volatile combustion products like sulfur, nitrogen, fluorine or chlorine seems to be of less importance as was found by experimental investigations.
• the present invention provides a cooling medium, e.g. for the application in high temperature environment, comprising an ionic liquid with a hydrogen content of 0% to 8.5%, such as 0% to 7% by weight, e.g. 0% to 6.5% by weight.
• a cooling medium provided by the present invention is herein also designated as “cooling medium of (according to) the present invention”.
• a cooling medium comprising an ionic liquid may be a cooling medium consisting of an ionic liquid.
• An ionic liquid provided by the present invention as a cooling medium is herein also designated as “ionic liquid of (according to) the present invention”.
• ionic liquid as used herein, e.g. in a process of the present invention, includes salts with melting temperatures of up to 250° C., e.g. ⁇ 100° C. and >100° C., but ⁇ 250° C.; preferably ⁇ 100° C. and more preferably less than room temperature.
• ionic liquid as used herein, further includes all liquid organic salts and mixtures of salts consisting of inorganic cations and organic anions or inorganic anions. Moreover additional salts with inorganic cation and organic or inorganic anion can be dissolved in the ionic liquid, containing but definitely not limited to the identical anion or identical anions as found in the basic ionic liquid. Moreover, additives may be dissolved in the ionic liquid, e.g. small amounts thereof, such as flame retardants.
• the present invention provides a cooling medium according to the present invention, further comprising dissolved salts with inorganic cations and organic or inorganic anions, and/or dissolved flame retardants.
• cations and anions which form the ionic liquid in a cooling medium according to the present invention is less important.
• Appropriate cations and anions are such which form ionic liquids having a hydrogen content of not more than 8.5%, e.g. 0% to 8.5%.
• the term “moieties” denote alkyl, perfluorated alkyl, alkenyl, alkinyl, aryl, aralkyl or heteroaryl groups having 1 to 8 carbon atoms, such as C1-C4-alkyl, C2-C4-alkenyl, C2-C4-alkinyl, phenyl, benzyl or heteroaryl, preferably alkyl.
• C1-C4-alkyl or similar terms is an abbreviatory notation for C1-alkyl (methyl), C2-alkyl (ethyl), . . . , C4-alkyl (n-butyl, isobutyl, tert-butyl) or similar terms.
• branched chains are preferred, having found to be superior over linear chains.
• the cation is selected from imidazolium, benzimidazolium or phosphonium, optionally and preferably being substituted by C1 to C4 alkyl, e.g. including 1,3-dialkylimidazolium, 1,2,3-trialkylimidazolium, 1,3-dialkylbenzimidazolium, 1,2,3-trialkylbenzimidazolium, tetraalkylphosphonium cations, wherein preferably alkyl independently is C1 to C4 alkyl.
• the cation is a quaternary ammonium, phosphonium, pyridinium, pyrrolium, piperidinium, pyrrolidinium, morpholinium, (benz)imidazolium or pyrazolium
• the cation is a quaternary ammonium or a quaternary phosphonium cation.
• the cation comprises one to four moieties as described above.
• the cation is one out of the group consisting of pyridinium, pyrrolium, e.g. wherein one moiety is bound to the nitrogen atom and/or one to three moieties are bound to carbon atoms of the carbon ring.
• the cation is one out of the group consisting of piperidinium, pyrrolidinium and morpholinium, e.g. wherein one or two moieties are bound to the nitrogen atom and/or one to three of the one to four moieties are bound to carbon atoms of the carbon ring.
• the cation is one out of the group consisting of (benz)imidazolium and pyrazolium, e.g. wherein a respective one of the one to four moieties is bound to each nitrogen atom and/or one to three of the one to four moieties are bound to carbon atoms of the carbon ring.
• a first moiety may be bound to a first nitrogen atom and a second moiety may be bound to a second nitrogen atom.
• the cation is preferably one out of the group consisting of tetramethylammonium, tetraethylammonium, triethylmethylammonium, tetrabutylammonium, tributylmethylammonium, 1,3-dimethylimidazolium, 1,3-diethylimidazolium, 1-butyl-3-methylimidazolium, 1,2,3-trimethylimidazolium, 1-ethyl-3-methylimidazolium, 1-ethyl-2,3-dimethylimidazolium, and 1-butyl-2,3-dimethylimidazolium, 1-propyl-3-methylimidazolium, 1-propyl-2,3-dimethylimidazolium, 1,3-dimethylbenzimidazolium, 1-butyl-3-methylbenzimidazolium, 1,2,3-trimethylbenzimidazolium, 1-ethyl-3-methyl
• the cation is preferably one out of the group of N-Butyl-N-Methylpyrrolidinium, N-Propyl-N-Methylpyrrolidinium, N-Ethyl-N-Methylpyrrolidinium, N,N-Dimethylpyrrolidinium, N-tert.Butyl-N-Methylpyrrolidinium, N-iso-Propyl-N-Methylpyrrolidinium, N-iso-Propyl-N-Ethylpyrrolidinium, N,N-Di-iso-Propylpyrrolidinium, N-tert.Butyl-N-Ethylpyrrolidinium, N-Butyl-N-Methylmorpholinium, N-Propyl-N-Methylmorpholinium, N-Ethyl-N-Methylmorpholinium, N,N-Dimethyl
• the present invention provides a cooling medium according to the present invention, wherein the cation of the ionic liquid is selected from imidazolium, e.g. C1-C6 alky-imidazolium, such as 1-ethyl- or 1-buylimidazolium, wherein the imidzalolyl ring optionally is substituted by alkyl, e.g. C1-C4 alkyl, such as methyl.
• imidazolium e.g. C1-C6 alky-imidazolium, such as 1-ethyl- or 1-buylimidazolium
• alkyl e.g. C1-C4 alkyl, such as methyl.
• the present invention provides a cooling medium according to the present invention, wherein the cation of the ionic liquid is selected from imidazolium, benzimidazolium or phosphonium, optionally independently substituted by C1 to C4 alkyl, perfluoro C1 to C4 alkyl and/or by cyano, e.g. one or more cyano groups.
• Anions in a ionic liquid according to the present invention include anions common in ionic liquid chemistry.
• the chemical formula of the anion contains 3 or less hydrogen atoms, more preferably the anions are completely hydrogen free.
• the anions comprise hetero elements, such as halogen, O, N, S, Si, B, P, a metallic element, such as Fe, Sb, Sn, Cu, Mo, Al, Zn, Co, Ni, Mn, W, V or Ti; these hetero elements may form (but are not limited to) complex anions with each other, e.g. the metallic elements listed above with halogen, SCN ⁇ , CN ⁇ , N(CN) 2 ⁇ or O-containing ligands, or any other hydrogen-free ligand.
• Appropriate anions include e.g. fluoride; chloride; bromide; thiocyanate; dicyanamide; hexafluorophosphate; sulfate; phosphate; hydrogen phosphate; dihydrogen phosphate; phosphonate HPO 3 2 ⁇ , hydrogen phosphonate H 2 PO 3 ⁇ ; sulfamate H 2 N—SO 3 ⁇ , methanesulfonate, dimethylphosphate, dimethylphosphonate, diethylphosphate, diethylphosphonate, tetrafluoroborate, trifluormethanesulfonate, trifluoracetate, bis(trifluormethylsulfonyl)imide, tris(trifluormethylsulfonyl)methide, fluorous alkyl phosphate, e.g.
• R i to R l independently of each other, are fluorine or an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residues, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, optionally comprising one or more heteroatoms and/or optionally substituted by one or more hydrogen-free functional groups or halogen; organic sulfonate, e.g. of formula
• R m is an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, optionally comprising one or more heteroatoms and/or optionally substituted by one or more hydrogen-free functional groups or halogen; organic sulfate, e.g. of formula
• R m is an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, optionally comprising one or more heteroatoms and/or optionally substituted by one or more hydrogen-free functional groups or halogen; carboxylate, e.g. of formula
• R n is an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, which optionally comprises one or more heteroatoms and/or optionally substituted by one or more hydrogen-free functional groups or halogen; (fluoroalkyl)fluorophosphate e.g. of formula
• R o to R u independently of each other are fluorine or an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue , e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, which optionally comprises one or more heteroatoms and/or optionally is substituted by one or more hydrogen-free functional groups or halogen; organic phosphate of formula
• R m is an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, which optionally comprises one or more heteroatoms and/or which optionally is substituted by one or more hydrogen-free functional groups or halogen; and wherein R n is hydrogen or an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g.
• R m is an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, which optionally comprises one or more heteroatoms and/or optionally is substituted by one or more hydrogen free functional groups or halogen; and wherein IV is hydrogen or an organic, inorganic, aliphatic or perfluorinated aliphatic, aromatic, heteroaromatic or perfluorinated aromatic or heteroaromatic residue, e.g. aliphatic residues comprising 1 to 4, aromatic or heteroaromatic residues comprising 5 to 10 carbon atoms, which optionally comprises one or more heteroatoms and/or optionally substituted by one or more hydrogen-free functional groups or halogen.
• an anion includes sulfates, phosphates, sulfonates.
• C1-C4 alkylsulfates such as methylsulfate, ethylsulfate, C1-C6 dialkylphosphates, such as diethylphosphate, C1-C4 alkylsulfonates wherein alkyl optionally is halogenated, e.g. fluorinated, such as methansulfonate, trifluoromethansulfonate, SiF 6 2 ⁇ , halogenated, e.g. fluorinated borates, e.g. tetrafluoroborate, arylated phosphates, e.g.
• halogenated e.g. fluorinated borates, e.g. tetrafluoroborate, arylated phosphates, e.g.
• triphenylphosphate ferrates, such as tetrachloroferrate-(III); e.g. diethylphosphate, triphenylphosphate, methansulfonate, trifluormethansulfonate, methylsulfate, ethylsulfate, SiF 6 2 ⁇ , tetrachloroferrat-(III) and/or tetrafluoroborate.
• ferrates such as tetrachloroferrate-(III); e.g. diethylphosphate, triphenylphosphate, methansulfonate, trifluormethansulfonate, methylsulfate, ethylsulfate, SiF 6 2 ⁇ , tetrachloroferrat-(III) and/or tetrafluoroborate.
• Ionic liquids according to the present invention may be prepared as appropriate, e.g. according, e.g. analogously to a known method, e.g. as described in prior art. Processes for the preparation of ionic liquids are known e.g. from Was serscheid, Peter; Welton, Tom (Eds.); “Ionic Liquids in Synthesis”, Wiley-VCH 2008; ISBN 978-3-527-31239-9; Rogers, Robin D.; Seddon, Kenneth R. (Eds.); “Ionic Liquids—Industrial Applications to Green Chemistry”, ACS Symposium Series 818, 2002; ISBN 0841237891 and numberous references cited therein.
• ionic liquids according to the present invention have a high flash point.
• the present invention provides a cooling medium according of the present invention wherein the ionic liquid has a flash point of at least 200° C., such as 250° C., determined according to DIN ISO 2592.
• a ionic liquid according to the present invention has a low melting point, e.g. from ⁇ 20° C. and below to 40° C.
• the present invention provides a cooling medium according to the present invention, wherein the ionic liquid has a melting point from 40° C. and below, such as 20° C. and below, e.g. 0° C. and below, such as ⁇ 20° C. and below.
• a cooling medium of the present invention comprising ionic liquids with low hydrogen content is particularly useful in terms of safe use because of low reactivity, low flame volume and low explosiviness in a high temperature environment, especially when getting in contact with high temperature melts or surfaces.
• a cooling medium of the present invention is particularly useful for the following applications:
• the present invention provides the use of a cooling medium according to the present invention for the cooling of
• composition of ionic liquids their sum formulae, the calculated content in weight % of carbon atoms “C”, hydrogen atoms “H” and other atoms “Z” which may form gaseous combustion products, the T-Onset temperature for the decomposition in air measured by a thermo balance (according to DIN 51007), the flashpoint (according to DIN ISO 2592) and the ratings for the reactivity (RA) and the flame volume (FV).
• the individual weight %s listed are based on the total mol weight of the composition.
• Z other atoms forming gaseous combustion products, e.g. N, S, F, Cl , but except O.
• EMIM is 1-Ethyl-3-methylimidazolium
• BMIM 1-Butyl-3-methylimidazolium.
• reactivity RA decreases from 3.5 of the compound with a hydrogen content from more than 8.5% (9.26%) at least to 3 (decrease of ca. 14%) down to 1 (decrease of ca. 71%) of ionic liquids of the present invention.
• flame volume decreases from 3.5 of the compound with a hydrogen content from more than 8.5% (9.26%) to at least to 2 (decrease of ca. 43%) down to 1 (decrease of ca. 71%) of the ionic liquids of the present invention.

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