WO2011060067A2 - Refrigerant storage in secondary loop refrigeration systems - Google Patents
Refrigerant storage in secondary loop refrigeration systems Download PDFInfo
- Publication number
- WO2011060067A2 WO2011060067A2 PCT/US2010/056227 US2010056227W WO2011060067A2 WO 2011060067 A2 WO2011060067 A2 WO 2011060067A2 US 2010056227 W US2010056227 W US 2010056227W WO 2011060067 A2 WO2011060067 A2 WO 2011060067A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- group
- substituted
- ionic liquid
- optionally substituted
- alkene
- Prior art date
Links
- 239000003507 refrigerant Substances 0.000 title claims abstract description 97
- 238000005057 refrigeration Methods 0.000 title claims abstract description 89
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000002608 ionic liquid Substances 0.000 claims abstract description 75
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 52
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 32
- 229910052794 bromium Inorganic materials 0.000 claims description 33
- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical compound CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 claims description 31
- 125000001072 heteroaryl group Chemical group 0.000 claims description 29
- 150000001336 alkenes Chemical class 0.000 claims description 28
- 229910052740 iodine Inorganic materials 0.000 claims description 28
- 150000001924 cycloalkanes Chemical class 0.000 claims description 27
- 229910052731 fluorine Inorganic materials 0.000 claims description 27
- 125000005842 heteroatom Chemical group 0.000 claims description 27
- 229910052710 silicon Inorganic materials 0.000 claims description 27
- 229910052717 sulfur Inorganic materials 0.000 claims description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- -1 Guanidinium Phosphonium Ammonium Chemical compound 0.000 claims description 20
- 125000003107 substituted aryl group Chemical group 0.000 claims description 15
- 150000001450 anions Chemical class 0.000 claims description 14
- 150000001768 cations Chemical class 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- RVEJOWGVUQQIIZ-UHFFFAOYSA-N 1-hexyl-3-methylimidazolium Chemical compound CCCCCCN1C=C[N+](C)=C1 RVEJOWGVUQQIIZ-UHFFFAOYSA-N 0.000 claims description 9
- 125000000217 alkyl group Chemical group 0.000 claims description 9
- 125000003118 aryl group Chemical group 0.000 claims description 9
- 125000001424 substituent group Chemical group 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 7
- 239000006096 absorbing agent Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- NIPWFPYJCVZBSC-UHFFFAOYSA-M 2-hydroxyethyl(trimethyl)phosphanium;chloride Chemical compound [Cl-].C[P+](C)(C)CCO NIPWFPYJCVZBSC-UHFFFAOYSA-M 0.000 claims description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 229910007161 Si(CH3)3 Inorganic materials 0.000 claims description 6
- OEYIOHPDSNJKLS-UHFFFAOYSA-N choline Chemical compound C[N+](C)(C)CCO OEYIOHPDSNJKLS-UHFFFAOYSA-N 0.000 claims description 6
- 229960001231 choline Drugs 0.000 claims description 6
- 125000000547 substituted alkyl group Chemical group 0.000 claims description 6
- 150000003973 alkyl amines Chemical group 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 125000001425 triazolyl group Chemical group 0.000 claims description 5
- 101100283604 Caenorhabditis elegans pigk-1 gene Proteins 0.000 claims description 4
- ZRALSGWEFCBTJO-UHFFFAOYSA-O guanidinium Chemical compound NC(N)=[NH2+] ZRALSGWEFCBTJO-UHFFFAOYSA-O 0.000 claims description 4
- KZWJWYFPLXRYIL-UHFFFAOYSA-M 1,1,2,2-tetrafluoroethanesulfonate Chemical compound [O-]S(=O)(=O)C(F)(F)C(F)F KZWJWYFPLXRYIL-UHFFFAOYSA-M 0.000 claims description 3
- JAUFPVINVSWFEL-UHFFFAOYSA-N 1,1-dimethylimidazol-1-ium Chemical compound C[N+]1(C)C=CN=C1 JAUFPVINVSWFEL-UHFFFAOYSA-N 0.000 claims description 3
- JOOXCMJARBKPKM-UHFFFAOYSA-M 4-oxopentanoate Chemical compound CC(=O)CCC([O-])=O JOOXCMJARBKPKM-UHFFFAOYSA-M 0.000 claims description 3
- DHMQDGOQFOQNFH-UHFFFAOYSA-M Aminoacetate Chemical compound NCC([O-])=O DHMQDGOQFOQNFH-UHFFFAOYSA-M 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 claims description 3
- 229910021592 Copper(II) chloride Inorganic materials 0.000 claims description 3
- KKUKTXOBAWVSHC-UHFFFAOYSA-N Dimethylphosphate Chemical compound COP(O)(=O)OC KKUKTXOBAWVSHC-UHFFFAOYSA-N 0.000 claims description 3
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 3
- AEMRFAOFKBGASW-UHFFFAOYSA-M Glycolate Chemical compound OCC([O-])=O AEMRFAOFKBGASW-UHFFFAOYSA-M 0.000 claims description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-O Imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 claims description 3
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 claims description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 3
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 claims description 3
- WTKZEGDFNFYCGP-UHFFFAOYSA-O Pyrazolium Chemical compound C1=CN[NH+]=C1 WTKZEGDFNFYCGP-UHFFFAOYSA-O 0.000 claims description 3
- LCTONWCANYUPML-UHFFFAOYSA-M Pyruvate Chemical compound CC(=O)C([O-])=O LCTONWCANYUPML-UHFFFAOYSA-M 0.000 claims description 3
- 125000003342 alkenyl group Chemical group 0.000 claims description 3
- 229940072107 ascorbate Drugs 0.000 claims description 3
- 235000010323 ascorbic acid Nutrition 0.000 claims description 3
- 239000011668 ascorbic acid Substances 0.000 claims description 3
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 3
- YOUGRGFIHBUKRS-UHFFFAOYSA-N benzyl(trimethyl)azanium Chemical compound C[N+](C)(C)CC1=CC=CC=C1 YOUGRGFIHBUKRS-UHFFFAOYSA-N 0.000 claims description 3
- 125000002619 bicyclic group Chemical group 0.000 claims description 3
- YCIMNLLNPGFGHC-UHFFFAOYSA-L catecholate(2-) Chemical compound [O-]C1=CC=CC=C1[O-] YCIMNLLNPGFGHC-UHFFFAOYSA-L 0.000 claims description 3
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 3
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims description 3
- HHLFWLYXYJOTON-UHFFFAOYSA-N glyoxylic acid Chemical compound OC(=O)C=O HHLFWLYXYJOTON-UHFFFAOYSA-N 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- ZCQWOFVYLHDMMC-UHFFFAOYSA-O hydron;1,3-oxazole Chemical compound C1=COC=[NH+]1 ZCQWOFVYLHDMMC-UHFFFAOYSA-O 0.000 claims description 3
- CZPWVGJYEJSRLH-UHFFFAOYSA-O hydron;pyrimidine Chemical compound C1=CN=C[NH+]=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-O 0.000 claims description 3
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 claims description 3
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 claims description 3
- YKEKHNWEUINKJV-UHFFFAOYSA-N kojate Chemical compound OCC1=CC(=O)C(=O)CO1 YKEKHNWEUINKJV-UHFFFAOYSA-N 0.000 claims description 3
- 229940001447 lactate Drugs 0.000 claims description 3
- 229940058352 levulinate Drugs 0.000 claims description 3
- 229940039748 oxalate Drugs 0.000 claims description 3
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 claims description 3
- 229950010765 pivalate Drugs 0.000 claims description 3
- IUGYQRQAERSCNH-UHFFFAOYSA-N pivalic acid Chemical compound CC(C)(C)C(O)=O IUGYQRQAERSCNH-UHFFFAOYSA-N 0.000 claims description 3
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 claims description 3
- JUJWROOIHBZHMG-UHFFFAOYSA-O pyridinium Chemical compound C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 claims description 3
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 claims description 3
- 229960001860 salicylate Drugs 0.000 claims description 3
- JDVPQXZIJDEHAN-UHFFFAOYSA-M succinamate Chemical compound NC(=O)CCC([O-])=O JDVPQXZIJDEHAN-UHFFFAOYSA-M 0.000 claims description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 claims description 3
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 claims description 3
- BXYHVFRRNNWPMB-UHFFFAOYSA-N tetramethylphosphanium Chemical compound C[P+](C)(C)C BXYHVFRRNNWPMB-UHFFFAOYSA-N 0.000 claims description 3
- UIERETOOQGIECD-ONEGZZNKSA-N tiglic acid Chemical compound C\C=C(/C)C(O)=O UIERETOOQGIECD-ONEGZZNKSA-N 0.000 claims description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 3
- GZYZCDFWRCSQRJ-UHFFFAOYSA-N pyrazine;pyrimidine;2h-triazole Chemical compound C=1C=NNN=1.C1=CN=CN=C1.C1=CN=CC=N1 GZYZCDFWRCSQRJ-UHFFFAOYSA-N 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Chemical class C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical class OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 4
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- NPNPZTNLOVBDOC-UHFFFAOYSA-N 1,1-difluoroethane Chemical compound CC(F)F NPNPZTNLOVBDOC-UHFFFAOYSA-N 0.000 description 3
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- WZLFPVPRZGTCKP-UHFFFAOYSA-N 1,1,1,3,3-pentafluorobutane Chemical compound CC(F)(F)CC(F)(F)F WZLFPVPRZGTCKP-UHFFFAOYSA-N 0.000 description 2
- WXGNWUVNYMJENI-UHFFFAOYSA-N 1,1,2,2-tetrafluoroethane Chemical compound FC(F)C(F)F WXGNWUVNYMJENI-UHFFFAOYSA-N 0.000 description 2
- BSKSXTBYXTZWFI-UHFFFAOYSA-M 1-butyl-3-methylimidazol-3-ium;acetate Chemical compound CC([O-])=O.CCCC[N+]=1C=CN(C)C=1 BSKSXTBYXTZWFI-UHFFFAOYSA-M 0.000 description 2
- OHMHBGPWCHTMQE-UHFFFAOYSA-N 2,2-dichloro-1,1,1-trifluoroethane Chemical compound FC(F)(F)C(Cl)Cl OHMHBGPWCHTMQE-UHFFFAOYSA-N 0.000 description 2
- FXRLMCRCYDHQFW-UHFFFAOYSA-N 2,3,3,3-tetrafluoropropene Chemical compound FC(=C)C(F)(F)F FXRLMCRCYDHQFW-UHFFFAOYSA-N 0.000 description 2
- 0 CCCC1(*)*(*)C(*)C(*)(C(C)CC)C(*)C1* Chemical compound CCCC1(*)*(*)C(*)C(*)(C(C)CC)C(*)C1* 0.000 description 2
- 239000002841 Lewis acid Substances 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical class C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UHCBBWUQDAVSMS-UHFFFAOYSA-N fluoroethane Chemical compound CCF UHCBBWUQDAVSMS-UHFFFAOYSA-N 0.000 description 2
- WMIYKQLTONQJES-UHFFFAOYSA-N hexafluoroethane Chemical compound FC(F)(F)C(F)(F)F WMIYKQLTONQJES-UHFFFAOYSA-N 0.000 description 2
- 150000007517 lewis acids Chemical class 0.000 description 2
- GTLACDSXYULKMZ-UHFFFAOYSA-N pentafluoroethane Chemical compound FC(F)C(F)(F)F GTLACDSXYULKMZ-UHFFFAOYSA-N 0.000 description 2
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 description 2
- 238000010223 real-time analysis Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- RPGGYYVWJTWVMS-ZPSVQYCPSA-N (8r,9s,10r,13s,14s,17r)-17-ethynyl-10,13-dimethyl-1,2,3,6,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-ol;(8r,9s,13s,14s,17r)-17-ethynyl-13-methyl-7,8,9,11,12,14,15,16-octahydro-6h-cyclopenta[a]phenanthrene-3,17-diol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1.C1CC[C@]2(C)[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 RPGGYYVWJTWVMS-ZPSVQYCPSA-N 0.000 description 1
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- UJPMYEOUBPIPHQ-UHFFFAOYSA-N 1,1,1-trifluoroethane Chemical compound CC(F)(F)F UJPMYEOUBPIPHQ-UHFFFAOYSA-N 0.000 description 1
- 241000208199 Buxus sempervirens Species 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 125000003282 alkyl amino group Chemical group 0.000 description 1
- 150000001350 alkyl halides Chemical class 0.000 description 1
- 239000002168 alkylating agent Substances 0.000 description 1
- 229940100198 alkylating agent Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- QLULGSLAHXLKSR-UHFFFAOYSA-N azane;phosphane Chemical compound N.P QLULGSLAHXLKSR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 230000005493 condensed matter Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- IWVSKNFJIVKXHH-UHFFFAOYSA-N pyrazine;pyrimidine Chemical compound C1=CN=CN=C1.C1=CN=CC=N1 IWVSKNFJIVKXHH-UHFFFAOYSA-N 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 150000003233 pyrroles Chemical class 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- 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
-
- 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
- C09K5/047—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for absorption-type refrigeration systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/27—Problems to be solved characterised by the stop of the refrigeration cycle
Definitions
- This invention relates to the field of refrigeration systems. More specifically, the invention relates to a process and system for storing a secondary refrigerant such as carbon dioxide in a secondary loop refrigeration system using ionic liquids.
- Secondary loop refrigeration systems have found widespread use in supermarkets and storage warehouses. This type of refrigeration system incorporates a primary refrigeration system and a secondary loop.
- the primary refrigeration system is often a traditional direct expansion design that uses a phase change refrigerant and a compressor to circulate a primary refrigerant.
- the secondary loop contains a nontoxic and nonflammable refrigerant such as carbon dioxide or propylene glycol.
- a heat exchanger is used to transfer energy between the primary refrigerant and the refrigerant in the secondary loop.
- the primary refrigeration system is typically restricted to an isolated location, e.g. a machine room or roof top, and the secondary loop runs through the storage compartments for storing refrigerated goods, e.g. supermarket display cases.
- Secondary loop refrigeration systems offer many advantages over conventional refrigeration systems, one of the most important being a significant improvement in energy efficiency. Additionally, secondary loop refrigeration systems are more compact, operate with a small charge of refrigerant, and minimize the effects of refrigerant leakage.
- Carbon dioxide is widely used as the secondary refrigerant in the secondary loop of these refrigeration systems.
- a problem arises when there is a shutdown of the primary refrigeration system, e.g. due to a loss of electrical power.
- the secondary refrigerant in the secondary loop increases in pressure, which can lead to very high pressures, such that the secondary refrigerant may need to be vented to prevent rupture of the secondary loop.
- a safety relief device is used in these systems so that when the pressure reaches the set point of the relief device, the device opens to the atmosphere, releasing the secondary refrigerant.
- the loss of the secondary refrigerant requires the system to be recharged when operation is restarted in order for the secondary loop to function properly.
- Ionic liquids are known to absorb refrigerants such as carbon dioxide, and have been used to remove carbon dioxide from gas mixtures.
- Moriya US 2007/00843414
- Tonkovich US 2009/0071335
- ionic liquids have not been used as storage media for a secondary refrigerant such as carbon dioxide in secondary loop refrigeration systems.
- This invention solves the stated problem by providing a method and apparatus for storing and recovering a secondary refrigerant, such as carbon dioxide, in a secondary loop refrigeration system using ionic liquids.
- a secondary refrigerant such as carbon dioxide
- this invention provides, in a secondary loop refrigeration system that comprises a primary refrigeration loop containing a primary refrigerant, a secondary refrigeration loop containing a secondary refrigerant, and a heat exchanger contacted by both the primary and secondary refrigeration loops, a method of storing secondary refrigerant, comprising (a) flowing at least a portion of the secondary refrigerant from the secondary loop to an auxiliary container; and (b) absorbing at least a portion of the flowed secondary refrigerant with an ionic liquid in the auxiliary container to form a mixture thereof.
- this invention provides an apparatus for adjusting the temperature of an object, medium or space, comprising (a) a primary refrigeration module that comprises a primary refrigeration loop containing a primary refrigerant, a condenser and an expansion valve; (b) a secondary refrigeration module that comprises a secondary refrigeration loop containing a secondary refrigerant, and an evaporator; (c) and a heat exchanger contacted by both the primary and secondary refrigeration loops; and (d) an auxiliary container in fluid communication with the secondary refrigeration loop through a flow interrupter, said auxiliary container containing at least one ionic liquid; wherein the condenser is located in proximity to an object, medium or space to be heated, or the evaporator is located in proximity to an object, medium or space to be cooled.
- this invention provides a process for storing carbon dioxide in a secondary loop refrigeration system comprising the steps of (a) providing a secondary loop refrigeration system comprising a secondary loop containing carbon dioxide; (b) releasing the carbon dioxide from the secondary loop; and (c) contacting the carbon dioxide released from the secondary loop with at least one ionic liquid, whereby at least a portion of the carbon dioxide is absorbed by the ionic liquid.
- this invention provides a refrigeration system comprising (a) an object, space or medium to be cooled; (b)a primary
- a refrigeration system containing a primary refrigerant, said primary refrigeration system comprising a compressor, a condenser, and an expansion valve; (c) a second refrigeration loop containing carbon dioxide; (d) an evaporator in open communication with the second refrigeration loop for transferring heat from said object, space or medium to the carbon dioxide; (e) a heat exchanger for transferring heat from the carbon dioxide in the second refrigeration loop to said primary refrigerant in the primary refrigeration system; and (f) an expansion tank in fluid communication with the second refrigeration loop through a flow interrupter, said expansion tank containing at least one ionic liquid.
- Figure 1 is a schematic drawing of an exemplary secondary loop refrigeration system for use with the process disclosed herein.
- Figure 2 is a layout of the components of a vapor compression cycle.
- Figure 3 is a layout of the components of an absorption cycle. Detailed Description
- secondary loop refrigeration system refers to a refrigeration system in which a thermal energy transfer medium contained in a secondary loop is used to transport thermal energy from a heat source to a primary refrigeration system.
- secondary loop refers to the path over which the thermal energy transfer medium travels while it is being cycled between the heat source and the primary refrigeration system.
- second refrigerant refers to the thermal energy transfer medium in the secondary loop.
- primary refrigeration system refers to the part of a secondary loop refrigeration system where heat is transferred to an object, medium or space, such as the external environment, by way of a compressor or an absorber/generator system.
- primary refrigerant refers to the thermal energy transfer medium in the primary refrigeration system.
- ionic liquid refers to an organic salt that is fluid at or below about 100°C.
- fluidic substance such as a fluorocarbon
- FC hydrofluorocarbon
- HFC hydrofluorocarbon
- CFC chlorofluorocarbon
- HCFC hydrochlorofluorocarbon
- ammonia alkanes, alkenes, aromatics, carbon dioxide, or other gas such as hydrogen, oxygen, nitrogen, and argon that may be used as a thermal energy transfer medium.
- a refrigerant when it changes phase from liquid to vapor (evaporates), removes heat from the surroundings; and when it changes phase from vapor to liquid (condenses), it adds heat to the surroundings.
- refrigerant may carry the connotation of a substance used only for cooling, the term is used herein in the generic sense of a thermal energy transfer medium that is applicable for use in a method, apparatus or system that may be used for heating or cooling.
- a secondary refrigerant such as carbon dioxide
- the inventions hereof may be used in situations where, for example, there is a shutdown of the primary refrigeration system.
- the methods and apparatus hereof eliminate the release of a secondary refrigerant into the environment and the need to recharge the secondary loop after a shutdown of the primary refrigeration system.
- Secondary loop refrigeration systems find utility in refrigeration applications such as supermarket display cases and warehouse storage containers.
- a secondary loop refrigeration system comprises a primary refrigeration system and a secondary loop.
- the primary refrigeration system is a traditional direct expansion design that uses a phase change refrigerant and a compressor, or an absorber/generator system, to circulate the refrigerant. Any suitable phase change refrigerant may be used as the primary refrigerant.
- suitable primary refrigerants include without limitation ammonia, fluorocarbons such as tetrafluoromethane (Freon 14), fluoroform (Freon 23), and hexafluoroethane (Freon 116); hydrofluorocarbons such as difluoromethane (HFC-32), 1,1-difluoroethane, 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC- 143a), 1,1-difluoroethane (HFC-152a), fluoroethane (HFC-161),
- HFC-125 pentafluoroethane
- HFC-245fa 1,1,1,3,3-pentafluoropropane
- HFC-365mfc 1,1,1,3, 3-pentafluorobutane
- fluoro-olefins such as 2,3,3,3- tetrafluoroprop-l-ene (HFO-1234yf); and mixtures thereof.
- the primary refrigeration system is typically contained in an isolated location, e.g. a machine room or roof top, when the system is used for cooling and it is desired to reject heat to the atmosphere. In other embodiments, however, the system may be used for heating, and the condenser is located in proximity to an object, medium or space to be heated.
- the secondary loop contains a secondary refrigerant, which is frequently carbon dioxide. Other suitable secondary refrigerants, however, include nitrogen, argon, helium, ammonia, perfluoroalkanes, ethylene glycols, and hydrofluoroethers.
- the evaporator is located in proximity to an object, medium or space to be cooled.
- heat energy from a food storage compartment is transferred to the secondary refrigerant in the secondary loop by way of an evaporator containing refrigeration coils.
- the heat transfer to the secondary refrigerant may be facilitated by the use of fans, which circulate the air in the storage compartment.
- the secondary refrigerant is circulated in the secondary loop to a heat exchanger by a circulating pump. In the heat exchanger, the thermal energy from the secondary refrigerant is transferred to the primary refrigerant contained in the primary refrigeration system.
- the cooled secondary refrigerant is returned to the storage compartment by way of the secondary loop.
- the warmed primary refrigerant is circulated through a compressor, or an absorber/generator system, to a condenser where the primary refrigerant is liquefied and cooled. By this process, the thermal energy is extracted from the primary refrigerant and rejected into the environment.
- the primary refrigerant is then expanded through an expansion valve and returned to the heat exchanger.
- the primary refrigerant may be routed to the condenser by either a vapor compression cycle or an absorbtion cycle.
- Vapor compression and absorption cycles, and systems in which they are run, are described in Application Guide for Absorption Cooling/Refrigeration Using Recovered Heat [Dorgan et al (American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc., 1995, Atlanta, GA, Chapter 5)].
- a schematic diagram for a system in which a simple vapor compression cycle is run is shown in Figure 2. The system is composed of condenser and evaporator units with an expansion valve, and a vapor
- FIG. 3 A schematic diagram for a simple absorption cycle is shown in Figure 3.
- the system is composed of condenser and evaporator units with an expansion valve similar to an ordinary vapor compression cycle shown in Figure 2, but an absorber-generator solution circuit replaces the compressor.
- the circuit may be composed of an absorber, a generator, a heat exchanger, a pressure control device (A) and a pump for circulating the solution.
- the heat released by the absorber upon the absorption of the refrigerant by the absorbent may be used to heat a mixture of refrigerant and absorbent in the generator to separate the refrigerant in vapor form from the absorbent.
- the absorbent can be any ionic liquid.
- This invention thus involves an apparatus for adjusting the temperature of an object, medium or space wherein the refrigerant is routed to the condenser by either a vapor compression cycle or an absorption cycle, as described herein, to cool or heat an object (for example a conduit or a container), a medium (for example a fluid such as air or water) or a space.
- an object for example a conduit or a container
- a medium for example a fluid such as air or water
- the apparatus may thus be composed of a mechanical compressor, a condenser and evaporator units with an expansion valve; or it may include components such as an absorber-generator solution circuit (which by the outflow and inflow of heat increases the pressure of refrigerant vapor as a compressor does mechanically) where the circuit may be composed of an absorber, a generator, a heat exchanger, a pressure control device and a pump for circulating the solution.
- an absorber-generator solution circuit which by the outflow and inflow of heat increases the pressure of refrigerant vapor as a compressor does mechanically
- the circuit may be composed of an absorber, a generator, a heat exchanger, a pressure control device and a pump for circulating the solution.
- Vapor compression and absorption systems are further described in US 2006/0197053 and US2007/0019708, each of which is by this reference incorporated in its entirety as a part hereof for all purposes.
- An apparatus of this invention may be deployed for use in, or fabricated or operated as, a refrigerator, a freezer, an ice machine, an air conditioner, an industrial cooling system, a heater or heat pump.
- Each of these instruments may be situated in a residential, commercial or industrial setting, or may be incorporated into a mobilized device such as a car, truck, bus, train, airplane, or other device for transportation, or may be incorporated into a piece of equipment such as a medical instrument.
- Ionic liquids suitable for use as disclosed herein can, in principle, be any ionic liquid that absorbs a secondary refrigerant such as carbon dioxide;
- ionic liquids that have minimal absorption of the refrigerant will be less effective.
- ionic liquids having high absorption of the selected refrigerant are desired for efficient use as described herein.
- mixtures of two or more ionic liquids may be used.
- Many ionic liquids are formed by reacting a nitrogen-containing heterocyclic ring, preferably a heteroaromatic ring, with an alkylating agent (for example, an alkyl halide) to form a quaternary ammonium salt, and performing ion exchange or other suitable reactions with various Lewis acids or their conjugate bases to form the ionic liquid.
- an alkylating agent for example, an alkyl halide
- heteroaromatic rings examples include substituted pyridines, imidazole, substituted imidazole, pyrrole and substituted pyrroles. These rings can be alkylated with virtually any straight, branched or cyclic Ci-20 alkyl group, but preferably, the alkyl groups are C1-16 groups. Various triarylphosphines, thioethers and cyclic and non-cyclic quaternary ammonium salts may also be used for this purpose.
- Ionic liquids suitable for use herein may also be synthesized by salt metathesis, by an acid- base neutralization reaction or by quaternizing a selected nitrogen-containing compound; or they may be obtained commercially from several companies such as Merck (Darmstadt, Germany), BASF (Mount Olive, NJ), Fluka Chemical Corp. (Milwaukee, WI), and Sigma-Aldrich (St. Louis, MO).
- ionic liquids suitable for use herein are included among those that are described in sources such as /. Chem. Tech.
- a library i.e. a combinatorial library, of ionic liquids may be prepared, for example, by preparing various alkyl derivatives of a quaternary ammonium cation, and varying the associated anions.
- the acidity of the ionic liquids can be adjusted by varying the molar equivalents and type and combinations of Lewis acids.
- Ionic liquids suitable for use herein comprise an anion and a cation.
- the cation is selected from the group consisting of cations represented by the structures of the following formulae:
- R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 12 and R 13 are independently selected group consisting of:
- cyclic alkane or alkene optionally substituted with at least one member selected from the group consisting of CI, Br, F, I, OH, NH 2 and SH;
- Si and S and optionally substituted with at least one member selected from the group consisting of CI, Br, F, I, OH, NH 2 and SH;
- branched or cyclic alkane or alkene optionally substituted with at least one member selected from the group consisting of CI, Br, F, I, OH, NH 2 and SH,
- R 10 can together form a cyclic or bicyclic alkanyl or alkenyl
- the ionic liquid comprises an anion
- the ionic liquid comprises a cation selected from one or more members of the group consisting of pyridinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, thiazolium, oxazolium, triazolium, phosphonium, ammonium, benzyltrimethylammonium, choline, dimethylimidazolium, guanidinium, phosphonium choline,
- the ionic liquid comprises an anion
- R 11 is selected from the group consisting of:
- Cio straight-chain, branched or cyclic alkane or alkene comprising one to three heteroatoms selected from the group consisting of 0, N, Si and S, and optionally substituted with at least one member selected from the group consisting of CI, Br, F, I, OH, NH2 and SH;
- cyclic alkane or alkene optionally substituted with at least one member selected from the group consisting of CI, Br, F, I, OH, NH 2 and SH,
- the ionic liquid is selected from the group consisting of l-butyl-3-methylimidazolium hexafluorophosphate [bmim] [PF6], l-butyl-3- methylimidazolium tetrafluoroborate [bmim] [BF4], l-hexyl-3- methylimidazolium bistrifluoromethylsulfonylimide [hmim] [Tf 2 N], and 1-butyl- 3-methylimidazolium acetate [bmim] [acetate].
- the method disclosed herein for storing a secondary refrigerant in a secondary loop refrigeration system comprises the following steps.
- the first step is providing a secondary loop refrigeration system, as described above.
- the secondary refrigerant When there is a shutdown of the primary refrigeration system, e.g. due to a loss of electrical power, the secondary refrigerant is released from the secondary loop and contacted with at least one ionic liquid, as described above, whereby at least a portion of the secondary refrigerant is absorbed by the ionic liquid.
- the portion of the secondary refrigerant absorbed is sufficient to relieve the pressure in the secondary loop.
- the amount of ionic liquid needed will depend on the amount of secondary refrigerant contained in the secondary loop and the absorption capability of the ionic liquid used.
- the absorbed secondary refrigerant may be released from the ionic liquid back into the secondary loop.
- the secondary refrigerant can be released from the ionic liquid most conveniently by heating the ionic liquid containing the secondary refrigerant.
- Fig 1. shows a schematic drawing of an exemplary secondary loop refrigeration system in cooling mode that may be used to practice the method disclosed herein.
- the secondary loop refrigeration system illustrated in Fig. 1 is suitable for use, for example, in a supermarket or grocery store. Similar systems may be useful for other applications, e.g. storage warehouses.
- refrigerant is depicted by dashed arrows and runs through an evaporator 10 in a refrigerated display case 90 (an example of a storage compartment for storing refrigerated goods), which is located in the interior of the store 100.
- the evaporator is in open communication with the secondary loop for transferring heat from the display case to the secondary refrigerant.
- the primary refrigeration system is depicted by solid arrows and comprises a compressor 30, a condenser 40, and an expansion valve 50.
- the heat exchanger 20 serves to transfer heat energy from the secondary refrigerant in the secondary loop to the primary refrigerant in the primary refrigeration system, as described above.
- pressure in the secondary loop increases. This pressure increase may be sensed by a pressure sensor 70 in fluid communication with the secondary loop.
- a flow interrupter for example a valve such as a pressure relief valve 80 depicted in Fig. 1, is opened, thereby releasing the secondary refrigerant from the secondary loop.
- the released secondary refrigerant enters an expansion tank 60, which is in fluid communication with the secondary loop, where it is contacted with at least one ionic liquid contained in the tank, whereby at least a portion of the released secondary refrigerant is absorbed by the ionic liquid.
- the absorbed secondary refrigerant may be released from the ionic liquid back into the secondary loop by heating the ionic liquid using a heat source 65, such as an electrical heating element, a natural gas or oil fueled heat source, that is in thermal contact with the expansion tank.
- a heat source 65 such as an electrical heating element, a natural gas or oil fueled heat source, that is in thermal contact with the expansion tank.
- min means minute(s)
- hr means hour(s)
- mL means milliliter(s)
- L means microliter(s)
- g means gram(s)
- mg means milligram(s)
- g means microgram(s)
- Pa means pascal(s)
- kPa means kilopascal(s)
- MPa means megapascal(s).
- Example 1 (Gibbstown, New Jersey) with a purity of >99%.
- Coleman grade C0 2 was obtained from MG Industries (Malvern, PA), with a minimum purity of 99.99%.
- a molecular sieve trap was installed to remove trace amounts of water from the C0 2 .
- l-Butyl-3-Methylimidazolium Hexafluorophosphate This example illustrates the solubility of carbon dioxide in l-butyl-3- methylimidazolium hexafluorophosphate [bmim] [PF 6 ] at temperatures of 283.15 °K, 298.15 °K, 323.15 °K, and 348.15 °K.
- the IGA design integrates precise computer-control and measurement of weight change, pressure and temperature to enable fully automatic and reproducible determination of gas absorption isotherms and isobars.
- the microbalance consists of an electrobalance with sample and counterweight components inside a stainless steel pressure-vessel.
- the balance has a weigh range of 0-100 mg with a resolution of 0.1 g.
- An enhanced pressure stainless steel (SS316LN) reactor capable of operation to 2.0 MPa and 773.15 °K was installed. Approximately 60 mg of the [bmim] [PF 6 ] ionic liquid sample was added to the sample container and the reactor was sealed.
- the sample was dried and degassed by first pulling a course vacuum on the sample with a diaphragm pump (model MVP055-3, Pfeiffer Vacuum Inc., Nashua, NH) and then fully evacuating the reactor to 10 "9 MPa with a turbopump (model TSH-071, Pfeiffer Vacuum Inc.). While under deep vacuum, the sample was heated to 348.15 °K for 10 hr with an external water jacket connected to a remote-controlled constant- temperature bath (Ministat, model cc-S3, Huber-USA, Northport, NY). A mixture of 30% ethylene glycol and 70% water by volume was used as the recirculating fluid with a temperature range from 278.15 to 363.15 °K.
- the sample mass slowly decreased as residual water and gases were removed. Once the mass had stabilized for at least 60 min, the sample dry mass was recorded.
- the percent weight loss for the ionic liquid was about 1-3 %. This weight loss can be attributed to the loss of residual water.
- the IGA-003 can operate in both dynamic and static modes. All absorption measurements were performed in static mode. Static mode operation
- the sample temperature was measured with a type K thermocouple with an accuracy of ⁇ 0.1 °K.
- the thermocouple was located inside the reactor next to the sample container.
- the water jacket maintained the set-point temperature automatically to within an accuracy of ⁇ 0.1 °K.
- Four isotherms at 283.15, 298.15, 323.15, and 348.15 °K were measured beginning with 283.15 °K. Once the desired temperature was achieved and stabilized, the admittance and exhaust valves automatically opened and closed to adjust the pressure to the first set-point.
- Pressures from lO -10 to 10 2 MPa were measured using a capacitance manometer (model PKR25, Pfeiffer Vacuum Inc.), and pressures from 10 2 to 2.0 MPa were measured using a piezo-resistive strain gauge (model PDCR4010, Druck, New Faifield, CT).
- the reactor pressure set-point was maintained to within ⁇ 0.4 to 0.8 kPa.
- the pressure ramp rate was set at 20 kPa/min and the temperature ramp rate was set at 1 °K/min.
- the upper pressure limit of the stainless steel reactor was 2.0 MPa, and several isobars up to 2.0 MPa (0.01, 0.05, 0.1, 0.4, 0.7, 1.0, 1.3, 1.5, and 2.0 MPa) were measured. To ensure sufficient time for gas- liquid equilibrium, the ionic liquid sample was maintained at set-point for a minimum of 3 hr with a maximum time-out of 20 hr.
- the IGA method exploits the relaxation behavior following pressure and temperature changes to simultaneously evaluate the time-dependent absorption and asymptotic uptake.
- the real-time processor was used to determine the end- point for each isotherm.
- the percent relaxation used as an end point for the realtime analysis was 99 percent.
- the minimum weight change for real-time analysis was set at 1 g, the acceptable average deviation of the model from the acquired data was set at 7 g, and the target interval for weight acquisition was set at a typical value of 1 pg.
- the temperature variation during an isotherm was maintained less than 0.1 ⁇ ° ⁇ / ⁇ .
- l-Butyl-3-methylimidazolium Tetrafluoroborate This example illustrates the solubility of carbon dioxide in l-butyl-3- methylimidazolium tetrafluoroborate [bmim] [BF4] at temperatures of 283.15 °K, 298.15 °K, 323.15 °K, and 348.15 °K.
- l-Butyl-3-methylimidazolium Acetate This example illustrates the solubility of carbon dioxide in l-butyl-3- methylimidazolium acetate [bmim] [acetate] at temperatures of 283.15 °K, 298.15 °K, 323.15 °K, and 348.15 °K.
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Abstract
Description
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EP10830655A EP2499212A4 (en) | 2009-11-11 | 2010-11-10 | Refrigerant storage in secondary loop refrigeration systems |
US13/509,044 US20130061612A1 (en) | 2009-11-11 | 2010-11-10 | Refrigerant storage in secondary loop refrigeration systems |
JP2012538946A JP2013511020A (en) | 2009-11-11 | 2010-11-10 | Refrigerant storage in secondary loop refrigeration system. |
CN2010800513943A CN102666774A (en) | 2009-11-11 | 2010-11-10 | Refrigerant storage in secondary loop refrigeration systems |
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- 2010-11-10 CN CN2010800513943A patent/CN102666774A/en active Pending
- 2010-11-10 EP EP10830655A patent/EP2499212A4/en not_active Withdrawn
- 2010-11-10 KR KR1020127014792A patent/KR20120095956A/en not_active Application Discontinuation
- 2010-11-10 WO PCT/US2010/056227 patent/WO2011060067A2/en active Application Filing
- 2010-11-10 US US13/509,044 patent/US20130061612A1/en not_active Abandoned
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US9296741B2 (en) | 2011-12-30 | 2016-03-29 | Abbvie Inc. | Bromodomain inhibitors |
US10633379B2 (en) | 2016-04-15 | 2020-04-28 | Abbvie Inc. | Bromodomain inhibitors |
Also Published As
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CN102666774A (en) | 2012-09-12 |
KR20120095956A (en) | 2012-08-29 |
US20130061612A1 (en) | 2013-03-14 |
EP2499212A2 (en) | 2012-09-19 |
WO2011060067A3 (en) | 2011-09-15 |
JP2013511020A (en) | 2013-03-28 |
EP2499212A4 (en) | 2012-10-17 |
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