OA16433A - Process for removing naphthenic acids from crude oil and crude oil distillates. - Google Patents
Process for removing naphthenic acids from crude oil and crude oil distillates. Download PDFInfo
- Publication number
- OA16433A OA16433A OA1201300214 OA16433A OA 16433 A OA16433 A OA 16433A OA 1201300214 OA1201300214 OA 1201300214 OA 16433 A OA16433 A OA 16433A
- Authority
- OA
- OAPI
- Prior art keywords
- crude oil
- ionic liquid
- group
- basic
- support
- Prior art date
Links
- 239000010779 crude oil Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 67
- WVRFSLWCFASCIS-UHFFFAOYSA-N 3-(3-ethylcyclopentyl)propanoic acid Chemical class CCC1CCC(CCC(O)=O)C1 WVRFSLWCFASCIS-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000011830 basic ionic liquid Substances 0.000 claims abstract description 123
- 239000003921 oil Substances 0.000 claims description 85
- -1 alkylcarbonate anions Chemical class 0.000 claims description 82
- 239000002608 ionic liquid Substances 0.000 claims description 70
- 125000000217 alkyl group Chemical group 0.000 claims description 64
- 239000002253 acid Substances 0.000 claims description 60
- 150000007524 organic acids Chemical class 0.000 claims description 39
- 235000005985 organic acids Nutrition 0.000 claims description 38
- 125000003118 aryl group Chemical group 0.000 claims description 26
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 26
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 22
- 150000001768 cations Chemical class 0.000 claims description 21
- 150000001450 anions Chemical class 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 17
- 125000004432 carbon atoms Chemical group C* 0.000 claims description 16
- 239000002904 solvent Substances 0.000 claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 14
- 125000005910 alkyl carbonate group Chemical group 0.000 claims description 13
- 125000002877 alkyl aryl group Chemical group 0.000 claims description 12
- 125000000623 heterocyclic group Chemical group 0.000 claims description 11
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 9
- BCHZICNRHXRCHY-UHFFFAOYSA-O 2H-oxazin-2-ium Chemical compound [NH2+]1OC=CC=C1 BCHZICNRHXRCHY-UHFFFAOYSA-O 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- 125000003545 alkoxy group Chemical group 0.000 claims description 8
- ZCQWOFVYLHDMMC-UHFFFAOYSA-O hydron;1,3-oxazole Chemical compound C1=COC=[NH+]1 ZCQWOFVYLHDMMC-UHFFFAOYSA-O 0.000 claims description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 6
- RAXXELZNTBOGNW-UHFFFAOYSA-O imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 6
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 claims description 6
- 150000002829 nitrogen Chemical group 0.000 claims description 6
- IANQTJSKSUMEQM-UHFFFAOYSA-O 1-benzofuran-1-ium Chemical compound C1=CC=C2[OH+]C=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-O 0.000 claims description 5
- SIKJAQJRHWYJAI-UHFFFAOYSA-O 1H-indol-1-ium Chemical compound C1=CC=C2[NH2+]C=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-O 0.000 claims description 5
- LPAGFVYQRIESJQ-UHFFFAOYSA-O 2,3-dihydro-1H-indol-1-ium Chemical compound C1=CC=C2[NH2+]CCC2=C1 LPAGFVYQRIESJQ-UHFFFAOYSA-O 0.000 claims description 5
- JUJWROOIHBZHMG-UHFFFAOYSA-O Pyridinium Chemical compound C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 claims description 5
- WVIICGIFSIBFOG-UHFFFAOYSA-N Pyrylium salt Chemical compound C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 claims description 5
- LJKVHZGQVDCXMY-UHFFFAOYSA-N [BH2+]1C=CC=C1 Chemical compound [BH2+]1C=CC=C1 LJKVHZGQVDCXMY-UHFFFAOYSA-N 0.000 claims description 5
- GLUUGHFHXGJENI-UHFFFAOYSA-O [H+].C1CNCCN1 Chemical compound [H+].C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-O 0.000 claims description 5
- WUHLVXDDBHWHLQ-UHFFFAOYSA-O [NH2+]1N=NN=N1 Chemical compound [NH2+]1N=NN=N1 WUHLVXDDBHWHLQ-UHFFFAOYSA-O 0.000 claims description 5
- CYUBECYEVLLYPK-UHFFFAOYSA-N [O+]=1BC=CC=1 Chemical compound [O+]=1BC=CC=1 CYUBECYEVLLYPK-UHFFFAOYSA-N 0.000 claims description 5
- PTHKTFIRHVAWPY-UHFFFAOYSA-N [O+]=1PC=CC=1 Chemical compound [O+]=1PC=CC=1 PTHKTFIRHVAWPY-UHFFFAOYSA-N 0.000 claims description 5
- DJMUYABFXCIYSC-UHFFFAOYSA-O [PH2+]1C=CC=C1 Chemical compound [PH2+]1C=CC=C1 DJMUYABFXCIYSC-UHFFFAOYSA-O 0.000 claims description 5
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-O furan-1-ium Chemical compound [OH+]1C=CC=C1 YLQBMQCUIZJEEH-UHFFFAOYSA-O 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- KYQCOXFCLRTKLS-UHFFFAOYSA-O hydron;pyrazine Chemical compound C1=C[NH+]=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-O 0.000 claims description 5
- CZPWVGJYEJSRLH-UHFFFAOYSA-O hydron;pyrimidine Chemical compound C1=CN=C[NH+]=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-O 0.000 claims description 5
- JWVCLYRUEFBMGU-UHFFFAOYSA-O hydron;quinazoline Chemical compound [NH+]1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-O 0.000 claims description 5
- SMWDFEZZVXVKRB-UHFFFAOYSA-O hydron;quinoline Chemical compound [NH+]1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-O 0.000 claims description 5
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 5
- NQRYJNQNLNOLGT-UHFFFAOYSA-O piperidinium(1+) Chemical compound C1CC[NH2+]CC1 NQRYJNQNLNOLGT-UHFFFAOYSA-O 0.000 claims description 5
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 5
- WTKZEGDFNFYCGP-UHFFFAOYSA-O pyrazolium Chemical compound C1=CN[NH+]=C1 WTKZEGDFNFYCGP-UHFFFAOYSA-O 0.000 claims description 5
- PBMFSQRYOILNGV-UHFFFAOYSA-O pyridazin-1-ium Chemical compound C1=CC=[NH+]N=C1 PBMFSQRYOILNGV-UHFFFAOYSA-O 0.000 claims description 5
- FZWLAAWBMGSTSO-UHFFFAOYSA-N thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 claims description 5
- 239000010457 zeolite Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- YNAVUWVOSKDBBP-UHFFFAOYSA-O [H+].C1COCCN1 Chemical compound [H+].C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-O 0.000 claims description 4
- 125000002015 acyclic group Chemical group 0.000 claims description 4
- 125000004183 alkoxy alkyl group Chemical group 0.000 claims description 4
- 125000005083 alkoxyalkoxy group Chemical group 0.000 claims description 4
- 125000003710 aryl alkyl group Chemical group 0.000 claims description 4
- 125000005418 aryl aryl group Chemical group 0.000 claims description 4
- 125000004367 cycloalkylaryl group Chemical group 0.000 claims description 4
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- AWJUIBRHMBBTKR-UHFFFAOYSA-O isoquinolin-2-ium Chemical compound C1=[NH+]C=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-O 0.000 claims description 4
- 125000005647 linker group Chemical group 0.000 claims description 4
- CXHHBNMLPJOKQD-UHFFFAOYSA-M methyl carbonate Chemical compound COC([O-])=O CXHHBNMLPJOKQD-UHFFFAOYSA-M 0.000 claims description 4
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 claims description 4
- 125000003107 substituted aryl group Chemical group 0.000 claims description 4
- 125000001425 triazolyl group Chemical group 0.000 claims description 4
- FCEHBMOGCRZNNI-UHFFFAOYSA-O 1-benzothiophen-1-ium Chemical compound C1=CC=C2[SH+]C=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-O 0.000 claims description 3
- GUUULVAMQJLDSY-UHFFFAOYSA-O 4,5-dihydro-1,2-thiazol-2-ium Chemical compound C1CC=[NH+]S1 GUUULVAMQJLDSY-UHFFFAOYSA-O 0.000 claims description 3
- 125000004414 alkyl thio group Chemical group 0.000 claims description 3
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 3
- TXCDCPKCNAJMEE-UHFFFAOYSA-O dibenzofuran;hydron Chemical compound [H+].C1=CC=C2C3=CC=CC=C3OC2=C1 TXCDCPKCNAJMEE-UHFFFAOYSA-O 0.000 claims description 3
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- CTAPFRYPJLPFDF-UHFFFAOYSA-O hydron;1,2-oxazole Chemical compound C=1C=[NH+]OC=1 CTAPFRYPJLPFDF-UHFFFAOYSA-O 0.000 claims description 3
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 claims description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 238000000622 liquid--liquid extraction Methods 0.000 claims description 3
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 claims description 3
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 3
- HYZJCKYKOHLVJF-UHFFFAOYSA-O 1H-benzimidazole;hydron Chemical compound C1=CC=C2[NH+]=CNC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-O 0.000 claims description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-O 1H-benzotriazol-1-ium Chemical compound C1=CC=C2[NH2+]N=NC2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-O 0.000 claims description 2
- BAXOFTOLAUCFNW-UHFFFAOYSA-O 1H-indazol-1-ium Chemical compound C1=CC=C2C=[NH+]NC2=C1 BAXOFTOLAUCFNW-UHFFFAOYSA-O 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 2
- 125000002091 cationic group Chemical group 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 239000003502 gasoline Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- KAESVJOAVNADME-UHFFFAOYSA-O hydron;1H-pyrrole Chemical compound [NH2+]1C=CC=C1 KAESVJOAVNADME-UHFFFAOYSA-O 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 2
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 claims description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 2
- RWRDLPDLKQPQOW-UHFFFAOYSA-O pyrrolidinium Chemical compound C1CC[NH2+]C1 RWRDLPDLKQPQOW-UHFFFAOYSA-O 0.000 claims description 2
- XSCHRSMBECNVNS-UHFFFAOYSA-O quinoxalin-1-ium Chemical compound [NH+]1=CC=NC2=CC=CC=C21 XSCHRSMBECNVNS-UHFFFAOYSA-O 0.000 claims description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 claims description 2
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 claims description 2
- 125000004435 hydrogen atoms Chemical class [H]* 0.000 claims 4
- 101700062473 NO21 Proteins 0.000 claims 1
- CQDGTJPVBWZJAZ-UHFFFAOYSA-M ethyl carbonate Chemical compound CCOC([O-])=O CQDGTJPVBWZJAZ-UHFFFAOYSA-M 0.000 claims 1
- 239000012071 phase Substances 0.000 description 34
- 150000007513 acids Chemical class 0.000 description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 29
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 25
- 239000002798 polar solvent Substances 0.000 description 23
- 238000000605 extraction Methods 0.000 description 21
- OKKJLVBELUTLKV-UHFFFAOYSA-N methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- 239000007788 liquid Substances 0.000 description 15
- 150000003839 salts Chemical class 0.000 description 14
- 239000011780 sodium chloride Substances 0.000 description 14
- 230000005591 charge neutralization Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxyl anion Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 13
- 230000001264 neutralization Effects 0.000 description 13
- 238000006386 neutralization reaction Methods 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 241000894007 species Species 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 9
- 150000002430 hydrocarbons Chemical class 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000002844 melting Methods 0.000 description 8
- 239000003495 polar organic solvent Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 150000002431 hydrogen Chemical class 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 239000008346 aqueous phase Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000002378 acidificating Effects 0.000 description 4
- 239000012267 brine Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 150000004893 oxazines Chemical class 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- FCEHBMOGCRZNNI-UHFFFAOYSA-N Benzothiophene Chemical class C1=CC=C2SC=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L Calcium hydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- IYYZUPMFVPLQIF-UHFFFAOYSA-N Dibenzothiophene Chemical class C1=CC=C2C3=CC=CC=C3SC2=C1 IYYZUPMFVPLQIF-UHFFFAOYSA-N 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- VUSWCWPCANWBFG-UHFFFAOYSA-N cyclohex-3-ene-1-carboxylic acid Chemical compound OC(=O)C1CCC=CC1 VUSWCWPCANWBFG-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000005588 protonation Effects 0.000 description 3
- 150000003577 thiophenes Chemical class 0.000 description 3
- KJUGUADJHNHALS-UHFFFAOYSA-N 1H-tetrazole Substances C=1N=NNN=1 KJUGUADJHNHALS-UHFFFAOYSA-N 0.000 description 2
- 239000007848 Bronsted acid Substances 0.000 description 2
- 239000003341 Bronsted base Substances 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Natural products C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 2
- CTAPFRYPJLPFDF-UHFFFAOYSA-N Isoxazole Chemical class C=1C=NOC=1 CTAPFRYPJLPFDF-UHFFFAOYSA-N 0.000 description 2
- MTCFGRXMJLQNBG-REOHCLBHSA-M L-serinate Chemical compound OC[C@H](N)C([O-])=O MTCFGRXMJLQNBG-REOHCLBHSA-M 0.000 description 2
- MGADZUXDNSDTHW-UHFFFAOYSA-N Pyran Chemical compound C1OC=CC=C1 MGADZUXDNSDTHW-UHFFFAOYSA-N 0.000 description 2
- 229920000535 Tan II Polymers 0.000 description 2
- 238000005917 acylation reaction Methods 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 229940111121 antirheumatic drugs Quinolines Drugs 0.000 description 2
- DCXYFEDJOCDNAF-UHFFFAOYSA-M asparaginate Chemical compound [O-]C(=O)C(N)CC(N)=O DCXYFEDJOCDNAF-UHFFFAOYSA-M 0.000 description 2
- 150000004856 boroles Chemical class 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 150000001907 coumarones Chemical class 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 150000004826 dibenzofurans Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 150000002240 furans Chemical class 0.000 description 2
- TWRZMXZXJKNOLO-UHFFFAOYSA-L histidinate(2-) Chemical compound [O-]C(=O)C(N)CC1=C[N-]C=N1 TWRZMXZXJKNOLO-UHFFFAOYSA-L 0.000 description 2
- 150000002460 imidazoles Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002475 indoles Chemical class 0.000 description 2
- 150000002476 indolines Chemical class 0.000 description 2
- 150000002537 isoquinolines Chemical class 0.000 description 2
- 150000003854 isothiazoles Chemical class 0.000 description 2
- KDXKERNSBIXSRK-UHFFFAOYSA-M lysinate Chemical compound NCCCCC(N)C([O-])=O KDXKERNSBIXSRK-UHFFFAOYSA-M 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- IYGMJRCUQOOENU-UHFFFAOYSA-N oxaphosphole Chemical class C1=COP=C1 IYGMJRCUQOOENU-UHFFFAOYSA-N 0.000 description 2
- 150000002916 oxazoles Chemical class 0.000 description 2
- 150000002918 oxazolines Chemical class 0.000 description 2
- 150000003853 pentazoles Chemical class 0.000 description 2
- 150000004857 phospholes Chemical class 0.000 description 2
- 150000004885 piperazines Chemical class 0.000 description 2
- 150000003053 piperidines Chemical class 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N precursor Substances N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- ONIBWKKTOPOVIA-UHFFFAOYSA-M prolinate Chemical compound [O-]C(=O)C1CCCN1 ONIBWKKTOPOVIA-UHFFFAOYSA-M 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- 150000003216 pyrazines Chemical class 0.000 description 2
- 150000003217 pyrazoles Chemical class 0.000 description 2
- 150000004892 pyridazines Chemical class 0.000 description 2
- 150000003222 pyridines Chemical class 0.000 description 2
- 150000003233 pyrroles Chemical class 0.000 description 2
- RWRDLPDLKQPQOW-UHFFFAOYSA-N pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 2
- 150000003246 quinazolines Chemical class 0.000 description 2
- 150000003248 quinolines Chemical class 0.000 description 2
- 230000001172 regenerating Effects 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 150000003536 tetrazoles Chemical class 0.000 description 2
- 150000004867 thiadiazoles Chemical class 0.000 description 2
- 150000003557 thiazoles Chemical class 0.000 description 2
- 150000003852 triazoles Chemical class 0.000 description 2
- KZSNJWFQEVHDMF-UHFFFAOYSA-M valinate Chemical compound CC(C)C(N)C([O-])=O KZSNJWFQEVHDMF-UHFFFAOYSA-M 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- LFSXCDWNBUNEEM-UHFFFAOYSA-N Phthalazine Chemical class C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 125000004450 alkenylene group Chemical group 0.000 description 1
- 125000005210 alkyl ammonium group Chemical group 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 125000000732 arylene group Chemical group 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical group [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 125000002993 cycloalkylene group Chemical group 0.000 description 1
- 125000000582 cycloheptyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004508 fractional distillation Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000011068 load Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 150000002780 morpholines Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 125000005702 oxyalkylene group Chemical group 0.000 description 1
- 125000004430 oxygen atoms Chemical group O* 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 150000007965 phenolic acids Chemical class 0.000 description 1
- 235000009048 phenolic acids Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- ZXDUPDQEFOYLOM-UHFFFAOYSA-O propylideneazanium Chemical group [CH2-]CC=[NH2+] ZXDUPDQEFOYLOM-UHFFFAOYSA-O 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 229910052904 quartz Inorganic materials 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000000717 retained Effects 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000000956 solid--liquid extraction Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Abstract
The present invention relates to a process for the removal of naphthenic acids from crude oils and crude oil distillates by use of supported basic ionic liquids.
Description
The Queen's University of Belfast
Process for Removing Naphthenic Acids from Crude Oil and Crude Oil Distillâtes
The présent invention relates to a process for the removal of naphthenic acids from crude oils and crude oil distillâtes.
Naphthenic acids are carboxylic acids found in crude oil and in various crude oil distillâtes during the refining of crude oils. The term “naphthenic acids encompasses a large number of carboxylic acid compounds comprising one or more cycloalkyl rings and having a molecular weight in the range of from about 120 to well over 700. The majority 10 of naphthenic acids found in crude oils and crude oil distillâtes hâve a carbon backbone comprising 9 to 20 carbon atoms and cyclopentyl rings are the prédominant cycloalkyl ring structure, although other cycloalkyl rings, such as cyclohexyl and cycloheptyl rings may be présent in appréciable amounts.
The presence of acidic impurities in crude oil and crude oil distillâtes causes corrosion of pipelines and distillation equipment at the elevated températures used in oil refineries (greater than 200 °C), and acidic crude oils and crude oil distillâtes hâve reduced market value compared to crude oils and crude oil distillâtes of low acidity. Accordingly, effective methods are required to reduce the naphthenic acid content of crude oils and 20 crude oil distillâtes.
The acidity of crude oils and crude oil distillâtes is measured in terms of the Total Acid Number (TAN) in accordance with ASTM D0664. The Total Acid Number is the amount of potassium hydroxide in milligrams that is needed to neutralize the acid in one gram of 25 oil, with values in excess of 0.5 mg KOH/g being indicative of high acidity. Typical TAN values for acidic crude oils and crude oil distillâtes are in the range of 0,5 to 4.0 mg KOH/g, while acidic distillate fractions such as kerosene may hâve TAN values in the range of, for example, 0.5 to 8.0 mg KOH/g.
Various methods for deacidifying crude oil and crude oil distillâtes are known. In a conventional deacidification process, an alkali such as aqueous sodium hydroxide or aqueous potassium hydroxide is contacted with the oil to neutralize any acid présent. The reaction produces an aqueous phase comprising water, and alkali métal sait. This
-2aqueous phase has to be removed from the deacidified oil before the oil can be used or sold. According to US 4,199,440, a problem anses in that alkali métal compounds are chemically similar to soap, and tend to emulsify hydrocarbon and aqueous phases. This émulsion interfères with the efficient séparation of the deacidified oil and aqueous phase.
A further example of a crude oil deacidification process is described in WO 00/46322. In this application, a crude oil is contacted with a polar solvent (for example, methanol), such that at least part of the acid présent in the oil is extracted into the solvent as an extract phase. The extract phase is then separated from the oil. However, a problem with this process is that a certain number of the acid impurities are not extractable into the solvent. A further problem is that the acid partitions between the oil and the extract phase such that high amounts of polar solvent and repeated extractions are required to reduce the acid content of the oil to an acceptable level. This has the further disadvantage that large volumes of polar solvent must be regenerated for recycling to the extraction stage.
One aspect of this invention is based on the discovery that specifically selected ionic liquids may be used to remove naphthenic acids from crude oils and crude oil distillâtes more efficiently than in prier art deacidification processes.
Ionie liquids are a novel class of compounds which hâve been developed over the last few years. The term “ionic liquid as used herein refers to a liquid that is capable of being produced by melting a sait, and when so produced consiste solely of ions. An ionic liquid may be formed from a homogeneous substance comprising one species of cation and one species of anîon, or it can be composed of more than one species of cation and/or more than one species of anion. Thus, an ionic liquid may be composed of more than one species of cation and one species of anion. An ionic liquid may further be composed of one species of cation, and one or more species of anion. Still further, an ionic liquid may be composed of more than one species of cation and more than one species of anion.
The term ionic liquid includes compounds having both high melting points and^/'
-3compounds having low melting points, e.g. at or below room température. Thus, many ionic liquids hâve melting points below 200 °C, preferably below 150 °C, particularly below 100 °C, around room température (15 to 30 °C), or even below 0 °C. Ionie liquids having melting points below around 30 °C are commonly referred to as “room température ionic liquids and are often derived from organic salts having nitrogencontaining heterocyclic cations, such as imidazolium and pyridinium-based cations. In room température ionic liquids, the structures of the cation and anion prevent the formation of an ordered crystalline structure and therefore the sait is liquid at room température.
Ionic liquids are most widely known as solvents, because their negtigible vapour pressure, température stabilîty, low flammability and recyclability make them environmentally friendly. Due to the vast number of anion/cation combinations that are available it is possible to fine-tune the physical properties of the ionic liquid (e.g. melting point, density, viscosity, and miscibility with water or organic solvents) to suit the requirements of a particular application.
According to US 2003/0085156 ionic liquids may be used in the removal of organosulfur compounds, such as mercaptans, sulfides, disulfides, thiophenes, benzothiophenes and dibenzothiophenes, from hydrocarbon materials via counter-current contact between a hydrocarbon stream and an ionic liquid. In the examples disclosed, very large quantities of ionic liquid are required, for example, 2ml of ionic liquid per 2ml of hydrocarbon, i.e. a 1:1 ratio.
US 2006/0070919 is concerned with the processing of Fischer-Tropsch synthesis effluents and more particularly alcohols and acids formed during such a reaction. Similar to US 2003/0085156, very large quantities of ionic liquid were required, for example, 2ml of ionic liquid per 4ml of hydrocarbon, in order to demonstrate satisfactory résulte.
It is readily apparent that such large quantities are not practical for commercial application, and indeed would be prohibitively expensive to operate.
-4In accordance with the présent invention, there is provided a process for removing organic acids from a crude oil and/or a crude oil distillate containing organic acids comprising the steps of:
(i) contacting the crude oil and/or the crude oil distillate containing organic acids with a supported basic ionic liquid having a basic anion selected from alkylcarbonate or hydrogen carbonate wherein the ionic liquid and the crude oil and/or crude oil distillate are contacted in a mass ratio of from greater than 1:40; and (ii) obtainîng a crude oil and/or crude oil distillate product having reduced acidity which is separated from the supported basic ionic liquid.
The présent inventors has found that the use of a supported basic ionic liquid having a basic anion selected from alkylcarbonate or hydrogencarbonate allows a crude oil/crude oil distillate to be more efficiently processed, such that a mass ratio of basic ionic liquid to crude oil/crude oil distillate of greater than 1:40 may be used.
Examples of organic acids that may be présent in the crude oil/crude oil distillate include phenolic acids, sulphur-containing acids, and most commonly, naphthenic acids. Preferably, the processes of the présent invention are for the removal of naphthenic acids.
The process of the présent invention is effective at ratios of basic ionic liquid to crude oil and/or the crude oil distillate in mass ratios of up to 1:200, and 1:300, and even greater than 1:300.
The ionic liquid and the crude oil and/or the crude oil distillate may be contacted in a mass ratio of from 1:50, and from 1:100, and also from 1:150.
In a preferred embodiment of the présent invention, the basic anion is selected from alkylcarbonate. More preferably the alkyl group may be linear or branched, and/or may additionally be substituted or unsubstituted.
-5In one preferred embodiment the alkyl group is unsubstituted.
In another preferred embodiment the alkyl group is unbranched.
In a more preferred embodiment the alkyl group is unsubstituted and unbranched.
In the embodiments of the présent invention, the alkyl group may comprise from 1 to 30 carbon atoms, preferably from 1 to 20 carbon atoms and more preferably form 1 to 10 carbon atoms.
The alkyl groups may be selected from one or more of methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl and/or decyl.
Especially preferred are methyl, ethyl, propyl, butyl and pentyl.
In a further preferred embodiment the alkyl groups are selected from methyl and ethyl.
It will be understood that branched alkyl groups such as iso-propyl, iso-butyl, sec-butyl and/or tert-butyl may also be used.
Suitable supports for use in the présent invention may be selected from silica, alumina, carbon, zirconia, alumina-silica, or a zeolite. Preferably, the support is silica.
Methods for supporting an ionic liquid on a support material are well known in the art, such for example, in US 2002/0169071, US 2002/0198100 and US 2008/0306319. Typically, the basic ionic liquid may be physisorbed or chemisorbed on the support material, preferably, chemisorbed. The ionic liquids may also be covalently bonded to the support material as described in further detail below.
In the processes of the présent invention, the ionic liquid may adsorbed onto the support in an ionic liquid:support mass ratio of from 10:1 to 1:10, preferably in an ionic liquid:support mass ratio of from 1:2 to 2:1. u
-6ln accordance with a further aspect of the présent invention, there is provided a process for removing organic acids, such as those described above, and preferably naphthenic acids, from a crude oil and/or a crude oil distillate containing organic acids comprising the steps of:
(i) contacting the crude oil and/or the crude oil distillate containing organic acids with a basic ionic liquid having a basic anion selected from alkylcarbonate (such as those described above) and hydrogencarbonate, and further wherein the ionic liquid and the crude oil and/or crude oil distillate are contacted in a mass ratio of from greater than 1:40; and (ii) obtaining a crude oil and/or crude oil distillate product having reduced acidity which is separated from the supported basic ionic liquid.
In the further aspect, the mass ratios of basic ionic liquid to crude oil and/or the crude oil distillate may be up to 1:100, and 1:125, and even up to 1:150. The ionic liquid and the crude oil and/or the crude oil distillate may be contacted in a mass ratio of from 1:50, and from 1:75, and also from 1:100.
The processes of the présent inventions as described herein are able to obtain crude oil/crude oil distillâtes having a TAN value of less than 0.25mg/g, preferably less than 0.2mg/g, more preferably less than 0.1mg/g, still more preferably less than 0.075mg/g and most preferably less than 0.05mg/g.
In the further aspect, the basic ionic liquid preferably has a melting point of less than 150°C, and more preferably less than 100°C. Alternative^, an ionic with a higher melting point, i.e. greater than 20°C, preferably greater than 100°C, and more preferably greater than 150°C may be used where it is intended to contact a solid ionic liquid with the crude oil/crude oil distillate.
In the processes of the présent inventions, the basic ionic liquid may comprise a cation selected or derived from the group consisting of: ammonium, azaannulenium,
-7azathiazolium, benzimidazolium, benzofuranium, benzotriazolium, borolium, cinnolinium, diazabicyclodecenium, diazabicyclononenium, diazabicyclo-undecenium, dithiazolium, furanium, imidazolium, indazolium, indolinium, indolium, morpholinium, oxaborolium, oxaphospholium, oxazinîum, oxazolium, /so-oxazolium, oxothiazolium, pentazolium, 5 phospholium, phosphonium, phthalazinium, piperazinium, piperidinium, pyranium, pyrazinium, pyrazolium, pyridazinium, pyridinium, pyrimidinium, pyrrolidinium, pyrrolium, quinazolinium, quinolinium, /so-quinolinium, quinoxalinium, selenozolium, sulfonium, tétrazolium, /so-thiadiazolium, thiazinium, thiazolium, thiophenium, triazadecenium, triazinium, triazolium, and /so-triazolium.
In one embodiment, the cation may be selected from the group consisting of:
+
I
+
| wherein: | Ra, Rb, Rc, Rd, Re, Rf and R9 are each îndependently selected from hydrogen, a C-ι to C3q, straight chain or branched alkyl group, a C3 to C8 cycloalkyl group, or a C6 to C10 aryl group, wherein said alkyl, cycloalkyl or aryl groups are unsubstituted or may be substituted by one to three groups selected from: C1 to C8 alkoxy, C2 to C12 alkoxyalkoxy, C3 to C8 cycloalkyl, C8 to C-ioaryl, -CN, -OH, -SH, NO2, C6 to C10 aryl and C7 to C10 alkaryl, -002(0! to Ce)alkyl, OC(O)(Ci to C6)alkyl, or any two of Rb, Rc, Rd, Ra and Rf attached to adjacent carbon atoms form a methylene chain -(CH2)q- wherein q is from 3 to 6. |
Preferably, Ra, Rb, Rc, Rd, R®, Rf and R9 are each îndependently selected from a Ci to C2o straight chain or branched alkyl group, a C3 to C6 cycloalkyl group, or a C6 aryl group, wherein said alkyl, cycloalkyl or aryl groups are unsubstituted or may be substituted by one to three groups selected from: Ci to C6 alkoxy, C2 to C12 alkoxyalkoxy, C3 to C8 cycloalkyl, C8 to C10 aryl, -CN, -OH, -SH, -NO2, -CO2(Ci to C6)alkyl, -OC(O)(Ci to C0)alkyl, C6 to C10 aryl and C7 to C10 alkaryl, and wherein one of Rb, Rc, Rd, Re, Rf and R9 may also be hydrogen.
Ra is preferably selected from Ci to C30, linear or branched, alkyl, more preferably C2 to C20 linear or branched alkyl, still more preferably, C2 to C10 linear or branched alkyl, and most preferably Ra is selected from ethyl, n-butyl, n-hexyl and n-octyl. Further examples include wherein Ra is selected from methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, nheptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyi, n-tridecyl, n-tetradecyl, npentadecyl, n-hexadecyl, n-heptadecyl and n-octadecyl.
-9In the cations comprising an R9 group, R9 is preferably selected from Ci to C10 linear or branched alkyl, more preferably, Ci to C5 linear or branched alkyl, and most preferably R9 is a methyl group.
In the cations comprising both an Ra and an R9 group, Ra and R9 are each preferably independently selected from Ci to C30, linear or branched, alkyl, and one of Ra and R9 may also be hydrogen. More preferably, one of Ra and R9 may be selected from C2 to C2o linear or branched alkyl, still more preferably, C2 to C10 linear or branched alkyl, and most preferably C4 to C8 linear or branched alkyl, and the other one of Ra and R9 may be selected from Ci to C10 linear or branched alkyl, more preferably, Ci to C5 linear or branched alkyl, and most preferably a methyl group. In a further preferred embodiment, Ra and R9 may each be independently selected, where présent, from Ci to C30 linear or branched alkyl and Ci to C15 alkoxyalkyl.
In another embodiment, the cation may be selected from the group consisting of:
[N(Ra)(Rb)(Rc)(Rd)]+, [P(Ra)(Rb)(Rc)(Rd)]+, and [S(Ra)(Rb)(Rc)]+, wherein: Ra, Rb, Rc and Rd are as defined above.
Preferably, the cation is selected from:
[N(Ra)(Rb)(Rc)(Rd)]+, wherein: Ra, Rb, Rc and Rd are each independently selected from Ci to C8 alkyl, including C2 ,C4 and C6 alkyl.
In the processes of the présent inventions, the term “crude oil or a crude oil distillate is intended to include liquefied petroleum gas, gasoline, gas oil, naphtha, kerosene, diesel fuel, fuel oil, jet fuel, home heating oil, lubricating oil or paraffin wax, or mixtures thereof.
In the processes of the présent inventions, the basic ionic liquid may additionally comprise a basic cation represented by the formula:
-10Cat+-(Z-Bas)n wherein: Cat+ is a positively charged moiety;
Bas is a basic moiety;
Z is a covalent bond joining Caf and Bas, or is a divalent linking group; and n is an integer of from 1 to 3, and preferably n is 1.
Suitably, Bas comprises at least one basic nitrogen, phosphorus, sulfur, or oxygen atom, preferably, at least one basic nitrogen atom.
Bas may comprise a heterocyclic ring System containing a basic nitrogen atom, a pyrrolidine or a piperidine ring
Preferably, Bas is selected from -N(R1)(R2), -P(R1)(R2) and -S(R3). Bas may also be -O(R3). Suitably, R1 and R2 are independently selected from hydrogen, linear or branched alkyl, cycloalkyl, aryl and substituted aryl, or, in the case of an -N(R1)(R2) group, R1 and R2 together with the interjacent nitrogen atom form part of a heterocyclic ring. Suitably, R3 is selected from linear or branched alkyl, cycloalkyl, aryl and substituted aryl.
Preferably, R1, R2 and R3 are selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, n-hexyl, cyclohexyl, benzyl and phenyl, or, in the case of an -N(R1)(R2) group, R1 and R2 together represent a tetramethylene or pentamethylene group optionally substituted by one or more Cm alkyl groups.
Preferably, the basic moiety is a “hindered basic group” i.e. is a functional group that acts as a base and, owing to steric hindrance, does not chemically bond to any of the components of the oil (other of course than by accepting a proton in the usual reaction of a Bronsted acid with a Bronsted base). Suitable hindered basic groups include N(CH(CH3)2)2 and -N(C(CH3)3)2. Preferably, the hindered basic group has a lower nucleophilicity (or greater steric hindrance) than N(C2H5)3.
-11 In the context of the présent invention, the group -OH is not considered basic due to difficulties with protonation. Accordingly, Bas as defined herein does not include -OH, and in a preferred embodiment, does not include -O(R3).
Z may be a divalent organic radical having from 1 to 18 carbon atom s, preferably 1 to 8 carbon atoms, more preferably, 2 to 6 carbon atoms. The divalent organic radical, Z, may be branched or unbranched. The divalent organic radical, Z, may be substituted or unsubstituted. Preferably, the valence bonds are on different carbon atoms of the divalent organic radical, Z.
Suitably, the divalent organic radical, Z, is a divalent aliphatic radical (for example, alkylene, alkenylene, cycloalkylene, oxyalkylene, oxyalkyleneoxy, alkyleneoxyalkylene or a polyoxyalkylene) or is a divalent aromatic radical (for example, arylene, alkylenearylene or alkylenearylenealkylene).
Preferably, Z is:
(a) a divalent alkylene radical selected from: -(CH2-CH2)-, (CH2-CH2-CH2)-, -(CH2CHz-CHs-CHa)-, -(CH2-CH2-CH2-CH2-CH2)-, -(CH2-CH2-CH2-CH2-CH2-CH2)-, -(CH2-CH(CH3))-, and -(CH2-CH(CH3)-CH2-CH(CH3))-;
(b) a divalent alkyleneoxyalkylene radical selected from: -(CH2-CH2-O-CH2-CH2)-, -(CH2-CH2-O-CH2-CH2-CH2)-, and -(CH2.CH(CH3)-O-CH2-CH(CH3))-;
(c) a divalent polyoxyethylene radical selected from: -(CH2CH2O)n- where n is an integer in the range 1 to 9 or -(CH2CH(CH3)O)m- where m is an integer in the range 1 to 6; and (d) a divalent alkylenearylene or an alkylenearylenealkylene radical selected from:
-(ΟΗ2-ΟθΗ4)-, and -(CH2-C6H4-CH2)-.
-12The Cat+ moiety may comprise a heterocyclic ring structure selected from imidazolium, pyridinium, pyrazolium, thiazolium, isothiazolinium, azathiozolium, oxothiazolium, oxazinium, oxazolium, oxaborolium, dithiozolium, triazolium, selenozolium, oxaphospholium, pyrollium, borolium, furanium, thiophenium, phospholium, pentazolium, 5 indolium, indolinium, oxazolium, isooxazolium, isotriazolium, tétrazolium, benzofuranium, dibenzofuranium, benzothiophenium, dibenzothiophenium, thiadiazolium, pyrimidinium, pyrazinium, pyridazinium, piperazinium, piperidinium, morpholinium, pyranium, annolinium, phthalazinium, quinazolinium, quinazalinium, quinolinium, isoquinolinium, thazinium, oxazinium and azaannulenium.
Examples of Cat+-Z-Bas where Cat+ is a heterocyclic ring structure include:
and
wherein: Bas and Z are as defined above; and Rb, Rc, Rd, Re, Rf, R9 and Rh are independently selected from hydrogen, a Ci to Ο40, straight chain or branched alkyl group, a C3 to Ce cycloalkyl group, or a Ce to C10 aryl group, wherein said alkyl, cycloalkyl or aryl groups are unsubstituted or may be substituted by one to three groups selected from: Ct to C6 alkoxy, Ce to C1o aryl, CN, OH, NO2, C? to
- 14C30 aralkyl and C7 to C30 alkaryl, or any two of Rb, Rc, Rd, R® and Rf attached to adjacent carbon atoms on the ring structure form a methylene chain -(CH2)P- wherein p is an integer from 3 to 5.
Preferred Caf-Z-Bas, where Caf is a heterocyclic ring structure, includes:
wherein:
Bas, Z and Rb are as defïned above.
It is particularly preferred that Caf is a heterocyclic ring structure and Bas is a sterically hindered amino group, for example:
The heterocyclic Caf moiety may be obtained by alkylation, protonation and/or acylation of a precursor selected from imidazoles, pyridines, pyrazoles, thiazoles, isothiazoles, azathiozoles, oxothiazoles, oxazines, oxazolines, oxazoboroles, dithiozoles, triazoles, selenozoles, oxaphospholes, pyrroles, boroles, furans, thiophenes, phospholes, pentazoles, indoles, indolines, oxazoles, isooxazoles, isotriazoles, tetrazoles, benzofurans, dibenzofurans, benzothiophenes, dibenzothiophenes, thiadiazoles,
-15pyrimidines, pyrazines, pyridazines, piperazines, piperidines, morpholenes, pyrans, annolines, phthalzines, quinazolines, quinoxalines, quinolines, isoquinolines, thazines, oxazines, and azaannulenes.
It is also envisaged that the Cat+ moiety may be an acyclic hydrocarbyl moiety. Preferably, the acyclic hydrocarbyl moiety comprises a group selected from amino amidino, îmino, guanidino, phosphino, arsino, stibino, alkoxyalkyl, alkylthio, alkylseleno and phosphinimino.
Where the Caf moiety is an acyclic hydrocarbyl moiety, [Cat+-Z-Bas] is preferably selected from:
+ +
N(Z-Bas)(Rb)(Rc)(Rd) and P(Z-Bas)(Rb)(Rc)(Rd)| wherein: Bas, Z, Rb, Rc, and Rd are as defined above. It is particularly preferred that Rb, Rc, and Rd are independently selected from methyl and ethyl.
Examples of preferred [Cat+-Z-Bas] of this class include:
-16where Bas is the sterically hindered amino group, -N(CH(CH3)2)2· [Cat+-Z-Bas] may also be:
wherein: Rb is as defined above.
Where the basic ionic liquid is unsupported, it is preferably immiscible with the oil. By immiscible with the oil is meant that the basic ionic liquid is soluble in the treated oil phase at a concentration of less than 50 ppm, preferably less than 30 ppm, more preferably less than 20 ppm, most preferably, less than 10 ppm, for example, less than 5 ppm. Thus, the solubility of the basic ionic liquid is tailored so that the basic ionic liquid is immiscible with the oil. The solubility of the basic ionic liquid may also be tailored such that the basic ionic liquid is either insoluble or soluble in water. By insoluble in water is meant that the basic ionic liquid has a solubility in water of less than 50 ppm, preferably, less than 30 ppm, more preferably less than 20 ppm, most preferably, less than 10 ppm, for example, less than 5 ppm.
Suitably, the contacting steps (i), of the processes of the présent invention, are carried out at a température of from ambient to 150°C. Suitably, the contacting steps (î) are carried out at a pressure of from 0.1 MPa absolute to 10 MPa absolute (1 bar absolute to 100 bar absolute).
Where the ionic liquid is unsupported, step (i) may be carried out by contacting the oil with the basic ionic liquid in a vessel wherein the resulting mixture is stirred using, for example, a mechanical stirrer, an ultrasonic stirrer, an electromagnetic stirrer or by bubbling an inert gas through the mixture. Suitably, the volume ratio of basic ionic liquid
- 17to oil in the extraction step is from greater than 1:40 to 1:300, and may be contacted in a mass ratio of from 1:50, preferably from 1:100. The mixing step may last from 1 minute to 60 minutes, preferably 2 to 30 minutes, more preferably, 5 to 20 minutes and most preferably, 8 to 15 minutes.
It will be understood that in the processes (i.e. supported and unsupported ionic liquids) of the présent inventions, it is not a requirement that the molar amount of basic ionic liquid employed in the contacting steps (i) be at least équivalent to the molar amount of organic acids in the oil.
Where the basic ionic liquid is water soluble, and the oil to be treated using the process of the présent invention has a high water content it may be necessary to dehydrate the oil prior to contacting the oil with the basic ionic liquid in steps (i). The water may be separated from the oil in, for example, a separator or coalescer. Preferably, the concentration of water in the oil is less than 0.5 % volume of oil, for example, less than 0.25 % volume of oil.
The water removed in the pre-treatment of the oil may itself contain organic acids which can be removed using basic ionic liquids. The présent invention therefore also provides a process by which organic acids can be removed from aqueous streams using basic ionic liquids. Such a process is extremely useful in ensuring that waste water effluents from oil processing plants are substantially free of contaminants which are potentially harmful to the environment.
Where the basic ionic liquid is insoluble in water, it is believed that any water présent in the mixture (arising from the oil) may be bénéficiai in achieving the clean séparation of the unsupported basic ionic liquid from the treated oil in step (ii). Accordingly, it is not necessary to dehydrate the oil prior to step (i).
For unsupported basic ionic liquids, step (ii) may be carried out by gravity séparation, (for example, in a settling unit) where the treated oil is generally the upper phase and the basic ionic liquid the lower phase in the settling unit. Where the unsupported basic ionic liquid is insoluble in water, the presence of the water will resuit in a 3 phase mixture
-18where the treated oil is generally the upper phase, the water the middle phase and the basic ionic liquid containing the organic acids the lower phase in the settling unit. The phases may also be separated in step (ii) using, for example, a decanter, a hydrocyclone, electrostatic coalescer or a centrifuge. Step (i) followed by step (ii) may be repeated several times, preferably 2 to 6, for example 2 to 4 times, until the level of organic acids in the oil is reduced to an acceptable value.
Steps (i) and (ii) may also be carried out together in a counter-current extraction column. The oil contaminated with the organic-containing acids (hereinafter “oil feed stream) is generally introduced at or near the bottom of the counter-current extraction column and the basic ionic liquid (hereinafter “basic ionic liquid feed stream) at or near the top of the counter-current extraction column. An oil phase which is reduced in acid content (hereinafter “product oil stream”) is withdrawn from the top of the column and a basic ionic liquid extract phase containing the extracted acids (hereinafter “extract stream) from at or near the bottom thereof. Preferably, the counter-current extraction column has a sump région for collecting the basic ionic liquid extract phase. Preferably, the oil feed stream is introduced to the counter-current extraction column immediately above the sump région. More than one counter-current extraction column may be employed, for example 2 to 6, preferably 2 to 3 columns arranged in sériés. Preferably, the counter-current extraction column is packed with a structured packing material, for example, glass Raschig rings, thereby increasing the flow path for the oil and basic ionic liquid through the column. Aiternatively, the counter-current extraction column may contain a plurality of trays.
Steps (i) and (ii) may also be carried out together in a centrifugal contact separator, for example, a centrifugal contact separator as described in US 4,959,158, US 5,571,070, US 5,591,340, US 5,762,800, WO 99/12650, and WO 00/29120. Suitable centrifugal contact separators include those supplied by Costner Industries Nevada, Inc. The oil contaminated with organic-containing acids and the basic ionic liquid may be introduced into an annular mixing zone of the centrifugal contact separator. Preferably, the oil, contaminated with the organic-containing acids, and the basic ionic liquid are introduced as separate feed streams into the annular mixing zone. The oil, and basic ionic liquid are rapidly mixed in the annular mixing zone such that at least a portion of the organic- o/-
- 19containing acids are extracted from the oil into the basic ionic liquid. The resulting mixture is then passed to a séparation zone wherein a centrifugal force is applied to the mixture to produce a clean séparation of an oil phase and a basic ionic liquid extract phase. Preferably, a plurality of centrifugal contact separators are used in sériés, preferably, 2 to 6, for example 2 to 3. Preferably, the oil feed stream is întroduced into the first centrifugal contact separator in the sériés while the basic ionic liquid feed stream is întroduced into the last centrifugal contact separator in the sériés such that oil of progressively decreasing organic-containing acid content is passed from the first through to the last centrifugal contact separator in the sériés while a basic ionic liquid of progressively increasing organic-containing acid content is passed from the last through to the first centrifugal contact separator in the sériés. Thus, the basic ionic liquid extract phase is removed from the first centrifugal contact separator and the oil phase of reduced acidity from the last centrifugal contact separator in the sériés.
The oil phase of reduced acidity (product oil stream) which is isolated from step (ii) may be used directly or may be further processed, for example, by fractional distillation. If necessary, any residual unsupported basic ionic liquid that is présent in the treated oil may be recovered by passing the product oil stream through a siiica column such that the residual basic ionic liquid is adsorbed onto the siiica column. The adsorbed basic ionic liquid may then be washed off the siiica column using a solvent for the basic ionic liquid and the basic ionic liquid may be recovered by driving off the solvent at reduced pressure. Alternatively, the oil may be removed from the residual ionic liquid by hot gas stripping using, for example, hot nitrogen gas.
For the supported basic ionic liquids, contacting step (i) and séparation step (ii) may also be carried out together by passing the oil through a column packed with a supported basic ionic liquid (i.e. a packed bed arrangement). Thus, the oil containing the organiccontaining acids may be passed through a column containing the supported basic ionic liquid. The organic-containing acids will become associated with the supported basic ionic liquid and oil having a reduced acid content will be removed from the column. In addition, or alternatively, a fixed-bed arrangement having a plurality of plates and/or trays may be used. vA
-20It will be noted, and indeed it is a further embodiment of the invention, that crude oil and/or crude oil distillâtes having reduced organic acid content may be separated from the basic ionic liquid containing organic acids by means of a liquid-liquid extraction.
Suitable liquids for this process include liquids which form a two phase mixture with the crude oil and/or crude oil distillate. Non-limiting examples of suitable liquids include water, aqueous solutions and alcohols.. More preferably, the alcohols may be selected from methanol and éthanol. Also more preferably, the liquid may be selected from water and brine.
This séparation process is also applicable to basic ionic liquids in general, and especially those having basic anions selected from serinate, prolinate, histidinate, threoninate, valinate, asparaginate, taurinate and lysinate.
It will also be appreciated that the processes of the présent invention may also be used to remove organic acids from any water présent in the hydrocarbon stream. In this way, a further aspect of the présent invention is a process for the removal of organic acids from an aqueous stream containing organic acids comprising the steps of:
(i) contacting the aqueous stream containing organic acids with a basic ionic liquid (supported or unsupported) as defined hereinabove; and (ii) obtaining an aqueous stream product having reduced acidity which is separated from the ionic liquid.
The aqueous stream containing organic acids and the basic ionic liquid may contacted in a mass ratio of from greater than 1:40. The mass ratios suitable for this aspect of the invention include those defined above for the processes for removing organic acids from crude oil/crude oil distillate.
Further, embodiments of the processes above for removing organic acids from crude oil/crude oil distillate also apply to this embodiment.
Preferably, the organic acids to be removed are carboxylic acids, «a/
-21 Other suitable basic ionic liquids for use in this aspect of the invention include those having basic anions selected from serinate, prolinate, histidinate, threoninate, valinate, asparaginate, taurinate and lysinate.
The processes of the présent inventions may additionally comprise the step of recovering the basic ionic liquid. Recovery of the basic ionic liquid preferabiy comprises recovering the basic ionic liquid from the organic acids by way of a régénération process.
The régénération process preferabiy comprises:
(a) contacting the basic ionic liquid with an acid having a pKa of less than
6.75.
The régénération process preferabiy further comprises the steps of:
(b) contacting the mixture of step (a) with a solvent which is immiscible with the basic ionic liquid; and (c) separating the solvent from the ionic liquid.
In accordance with another aspect of the présent invention, there is provided a process for the régénération of a basic ionic liquid comprising organic acids from crude oil/crude oil distillate comprising the steps of:
(a) contacting the basic ionic liquid with an acid having a pKa of less than 6.75;
(b) contacting the mixture of step (a) with a solvent which is immiscible with the basic ionic liquid; and (c) separating the solvent from the ionic liquid.
Preferabiy, the pKa of the acid is less than 6.25. vt/
-22Suitable acids for use in the régénération process are those that meet the pKa requirements above. Preferably, the acid is carbonic acid.
Other suitable régénération methods include:
(1) extraction of the organic-containing acids into a solvent that is immiscible with the basic ionic liquid;
(2) vaporization of the acids at a reduced pressure and at a température less than the décomposition température of the ionic liquid, preferably, a température less than 200°C; (3) reaction of the acids within the basic ionic liquid to form: (i) products that are insoluble in the basic ionic liquid, (îi) products that are more readily extracted into a solvent that is immiscible with the basic ionic liquid, or (iii) volatile products that are more readily separated from the basic ionic liquid;
(4) gas stripping wherein a hot gas, for example steam or nitrogen is passed through the ionic liquid to volatilize the acids;
(5) extraction of the acids with a supercritical fluid, for example, liquefied carbon dioxide; and (6) membrane séparation (polymer-based, ceramic, zeolite and liquid-liquid Systems) where the membrane is selectively permeable to the acids; and combinations of these methods.
Preferably, the organic-containing acids contained in the separated basic ionic liquid extract phase are reacted with a Group 1 and/or Group 2 métal hydroxide such that at least a portion of the acids, preferably, substantially ail of the acids, are converted into Group 1 and/or Group 2 neutralization salts thereof within the basic ionic liquid. For example, the basic ionic liquid extract phase may be contacted with solid Group 1 and/or Group 2 métal hydroxide. Without wishing to be bound by any theory, it is believed that the neutralization salts formed by the reaction of the Bronsted acid and the Bronsted base may precipitate from the basic ionic liquid and may therefore be readily separated therefrom. Alternatively, where the basic ionic liquid is insoluble in a polar solvent, the neutralization salts may be extracted from the basic ionic liquid extract phase into the polar solvent. By insoluble in the polar solvent is meant that the basic ionic liquid has a solubility in the polar solvent of less than 50 ppm, preferably, less than 30 ppm, more preferably, less than 20 ppm, most preferably, less than 10 ppm, for example, less than
-235 ppm. Suitable polar solvents include water and polar organic solvents such as Ci to C6 aliphatic alcohols, in particular, methanol or éthanol. Where the basic ionic liquid is insoluble in the polar solvent, it is preferred to contact the basic ionic liquid extract phase with a solution of the Group 1 and/or Group 2 métal hydroxide in the polar solvent thereby generating a basic ionic liquid phase of reduced organic-containing acid content and a polar solvent extract phase containing the Group 1 and/or Group 2 métal neutralization salts. Where the polar solvent is a polar organic solvent, the volume ratio of polar organic solvent to basic ionic liquid is typically less than 1:1, preferably less than 0.5:1, more preferably, less than 0.25:1, for example, less than 0.1:1. The polar organic solvent may then be recovered by volatilization of the solvent at reduced pressure leaving behind a solid residue comprising the Group 1 and/or Group 2 métal neutralization salts. Accordingly, it is preferred to contact the basic ionic liquid extract phase with the minimum amount of the solution of the Group I and/or Group 2 métal hydroxide in the polar organic solvent. Preferably, the polar solvent is water resulting in a waste water stream containing the Group 1 and/or Group 2 métal neutralization salts of the acid. Where the method of the présent invention is employed offshore on a hydrocarbon production platform, the water is preferably seawater and the waste water stream may be disposed of by, for example, being injected into a porous subterranean formation (waste water disposai zone). Thus, higher amounts of water may be employed than polar organic solvent.
The Group 1 métal hydroxide may be selected from lithium hydroxide, sodium hydroxide, and potassium hydroxide, preferably, sodium hydroxide. Suitably, the Group I1A métal hydroxide is selected from barium hydroxide, magnésium hydroxide, and calcium hydroxide, preferably, calcium hydroxide. Mixtures of Group 1 and/or Group 2 métal hydroxides may be employed. However, ît is preferred to employ a Group 2 métal sait or mixtures thereof owing to the risk of Group 2 métal salts of the acids forming soaps that can interfère with the séparation of the polar solvent from the basic ionic liquid. Particularly preferred is calcium hydroxide.
It is envisaged that where the treated oil is a hydrocarbon that has been produced offshore from a porous hydrocarbon bearing formation, that the basic ionic liquid may be contacted with a brine, for example, seawater or a produced water, on a production
-24platform where the pH of the seawater is adjusted using a base to a value of at least 8, preferably at least 10 during the contacting step. Seawater contains naturally occurring Group 1 and Group 2 métal ions in an amount sufficient to complex with the acids contained in the basic ionic liquid. Typically, the pH of the brine may be adjusted to a value in the range 10 to 12 so that the pH of the brine after neutralization of the acids is in the range 4 to 9. The pH of the seawater may be adjusted using a Group 1 and/or 2 métal hydroxide, for example, sodium hydroxide.
Where the basic ionic liquid is insoluble in the polar solvent, it is envisaged that the oil containing the organic-containing acids, the basic ionic liquid and the solution of the Group 1 and/or 2 métal hydroxide in the polar solvent (preferably, water or methanol) may be mixed together in a stirred vessel followed by séparation of an oil phase of reduced organic-containing acid content, a polar solvent phase containing Group 1 and/or 2 neutralization salts of the acids and a basic ionic liquid phase. It is also envisaged that the oil containing the organic-containing acids may be contacted with the basic ionic liquid and the solution of a Group 1 and/or Group 2 métal hydroxide in the polar solvent (preferably, water or methanol) in a counter-current extraction column. For example, the oil containing the organic-containing acids and an aqueous solution of the Group 1 and/or 2 métal hydroxide may be introduced at or near the bottom of the column and the basic ionic liquid at or near the top thereof. Thus, oil having a reduced acid content is removed from at or near the top of the column, basic ionic liquid from at or near the bottom of the column and an aqueous solution of Group 1 and/or 2 métal neutralization salts of the acids from an intermediate position. Alternatively, a solution of the Group 1 and/or 2 métal hydroxide in methanol may be introduced into the column, at or near the bottom thereof and, depending upon the density of the oil, a solution of the Group 1 and/or Group 2 métal neutralization salts of the acids in methanol may be removed from either at or near the top of the column with the oil of reduced organiccontaining acid content being removed from an intermediate position or the oil of reduced acid content may be removed from at or near the top of the column and the solution of the Group 1 and/or Group 2 métal neutralization salts of the acids from an intermediate position.
It is also envisaged that the basic ionic liquid containing the organic-containing acids
-25may be contacted with a Ci to C6 aliphatic alcohol in the presence of an estérification catalyst (for example, a heterogeneous or homogeneous estérification catalyst) under conditions effective to convert at least a portion of the acids into the corresponding esters thereof. These ester dérivatives are more volatile than the acids and hence are more readily separated from the basic ionic liquid, for example, by vaporisation at reduced pressure and at a température of less than 150°C.
The supported basic ionic liquid may additîonally be regenerated by passing a solution of a Group 1 and/or Group 2 métal hydroxide in a polar solvent through the column such that the acids are converted into their corresponding neutralization salts and are washed off the column by the polar solvent Suitably, the polar solvent is water or a C-ι to Ce aliphatic alcohol or mixtures thereof. Preferably, the polar organic solvent is water, methanol or éthanol. Where the basic ionic liquid is physiosorbed onto the silica column, the basic ionic liquid should be insoluble in the polar solvent so that the basic ionic liquid is not stripped from the column. Where the polar solvent is water, the resulting waste water stream may be disposed of, for example, by being injected into a porous subterranean formation (waste water disposai zone). Where the polar organic solvent is methanol or éthanol, the solvent may be driven off from the neutralization salts at reduced pressure.
In yet another aspect of the présent invention there is provided a process for removing organic acids from a crude oil and/or a crude oil distillate containing organic acids comprising the steps of:
a. contacting the crude oil and/or the crude oil distillate containing organic acids with a covalently bonded ionic liquid having the formula:
[SUPPORT-Z-Cat+] [X-] wherein: SUPPORT represents a solid support, preferably selected from silica, alumina, carbon, zirconia, alumina-silica, and a zeolite; Z is a divalent linking group;
[Cat+] is a cationic moiety; and
-26[X] is an anion selected from alkylcarbonate (such as those described above) and hydrogen carbonate; and
b. separating a crude oil and/or crude oil distillate product having reduced 5 acidity from the solid supported ionic liquid.
The Caf moiety may comprise or consist of a heterocyclic ring structure selected from imidazolium, pyridinium, pyrazolium, thiazolium, isothiazolinium, azathiozolium, oxothiazolium, oxazinium, oxazolium, oxaborolium, dithiazolium, triazolium, 10 selenozolium, oxaphospholium, pyrollium, borolium, furanium, thiophenium, phospholium, pentazolium, indolium, indolinium, oxazolium, isooxazolium, isotriazolium, tétrazolium, benzofuranium, dibenzofuranium, benzothiophenium, dibenzothiophenium, thiadiazolium, pyrimidinium, pyrazinium, pyridazinium, piperazinium, piperidinium, morpholinium, pyranium, annolinium, phthalazinium, quinazolinium, quinazalinium, 15 quinolinium, isoquinolinium, thazinium, oxazinium and azaannulenium.
Preferred [SUPPORT-Z-Caf] in accordance with the présent invention may be selected from:
and
| wherein: | SUPPORT and Z are as defined above; and Rb, Rc, Rd, Re, Rr and R9 can be the same or different, and are each independently selected from hydrogen, a C! to Ο40, straight chain or branched alkyl group, a C3 to C8 cycloalkyl group, or a C6 to Cio aryl group, wherein said alkyl, cycloalkyl or aryl groups are^^Z- |
-28unsubstituted or may be substituted by one to three groups selected from: Ci to C6 alkoxy, C6 to Ci0 aryl, CN, OH, NO21 C7 to C30 aralkyl and C? to C30 alkaryl, or any two of Rb, Rc, Rd, Re and Rf attached to adjacent carbon atoms form a methylene chain (CH2)q- wherein q is from 8 to 20.
Preferabiy, Ra, Rb, Rc, Rd, R®, Rr and R9 are each independently selected from a Ci to C20 straight chain or branched alkyl group, a C3 to Ce cycloalkyl group, or a C6 aryl group, wherein said alkyl, cycloalkyl or aryl groups are unsubstituted or may be substituted by one to three groups selected from: Ci to Ce alkoxy, C2 to Ci2 alkoxyalkoxy, C3 to C8 cycloalkyl, C6 to C™ aryl, -CN, -OH, -SH, -NO2, -CO2(Ci to Ce)alkyl, -OC(O)(Ci to C6)alkyl, Ce to C™ aryl and C7 to C10 alkaryl, and wherein one of Rb, Rc, Rd, Re, Rf and R9 may also be hydrogen.
Ra is preferabiy selected from Ci to C3q, linear or branched, alkyl, more preferabiy C2 to C20 linear or branched alkyl, still more preferabiy, C2 to Cio linear or branched alkyl, and most preferabiy Ra is selected from ethyl, n-butyl, n-hexyl and n-octyl. Further examples include wherein Ra is selected from methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, nheptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, npentadecyl, n-hexadecyl, n-heptadecyl and n-octadecyl.
In the cations comprising an Rg group, R9 is preferabiy selected from Ci to Cw linear or branched alkyl, more preferabiy, Ci to C5 linear or branched alkyl, and most preferabiy R9 is a methyl group.
In the cations comprising both an Ra and an R9 group, Ra and R9 are each preferabiy independently selected from Ci to C30, linear or branched, alkyl, and one of Ra and R9 may also be hydrogen. More preferabiy, one of Ra and R9 may be selected from C2 to C20 linear or branched alkyl, still more preferabiy, C2 to C10 linear or branched alkyl, and most preferabiy C4 to Ce linear or branched alkyl, and the other one of Ra and Rg may be selected from Ci to C10 linear or branched alkyl, more preferabiy, Ci to C5 linear or branched alkyl, and most preferabiy a methyl group. In a further preferred embodiment, Ra and R9 may each be independently selected, where présent, from Ci to C30 linear or ,χΛ
-29branched alkyl and Ci to Ci5alkoxyalkyl.
The Cat+ moiety for use in the présent invention may be obtained by akylation, protonation and/or acylation of a precursor selected from imidazoles, pyridines, pyrazoles, thiazoles, isothiazoles, azathiozoles, oxothiazoles, oxazines, oxazolines, oxazoboroles, dithiozoles, triazoles, selenozoles, oxaphospholes, pyrroles, boroles, furans, thiophenes, phospholes, pentazoles, indoles, indolines, oxazoles, isooxazoles, isotriazoles, tetrazoles, benzofurans, dibenzofurans, benzothîophenes, dibenzothiophenes, thiadiazoles, pyrimidines, pyrazines, pyridazines, piperazines, piperidines, morpholines, pyrans, annolines, phthalazines, quinazolines, quinazalines, quinolines, isoquinolines, thazines, oxazines, and azaannulenes.
In accordance with the présent invention, the Cat+ moiety may also be an acyclic organic ion.
Where the Cat+ moiety is acyclic, it preferably comprises or consists of a group selected from amino amidino, imino, guanidino, phosphino, arsino, stibino, alkoxyalkyl, alkylthio, alkylseleno and phosphinimino.
Where the Cat+ moiety is acyclic, [SUPPORT-Z-Cat+] is preferably selected from:
wherein: SUPPORT, Z, Rb, Rc, and Rd are as defined above.
More preferably Rb, Rc and Rd may be the same or different, and are each îndependently selected from hydrogen, a Ci to C2o, straight chain or branched alkyl group. Even more preferably, Rb, Rc and Rd are the same or different, and are each îndependently selected from hydrogen, a Ci to C)0, straight chain or branched alkyl group.
Examples of suitable alkyl groups include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl and/or decyl. One preferred group of alkyl groups comprises methyl, ethyl, propyl and/or butyl.
-30Even more preferably, [SUPPORT-Z-Cat+] is selected from:
| + | “ —1 | ||
| H I | c2h5 | ||
| H— | I —N---Z--SUPPORT I | or | C2H5---N---Z---SUPPORT |
| I H | C2H5 | ||
| - | - | - |
wherein: SUPPORT and Z are as defined above.
In accordance with the présent invention, [SUPPORT-Z-Cat+] may also be:
z
I
SUPPORT wherein: SUPPORT and Z are as defined above
It will be readily appreciated that [SUPPORT-Z-Cat+] [X] may be used in accordance with one or more of the processes disclosed above and/or recycled in accordance with one or more of the régénération processes disclosed above.
The processes of the présent inventions provide a crude oil/crude oil distillate having reduced acid content.
The processes of the présent inventions may be carried out on an offshore platform, in a refinery, or whilst the oil is being transported, for example, in a tanker at sea.
-31 The présent inventions will now be described further by way of example.
EXAMPLES
Test Oi/s
The oils used in the examples below are as follows:
• Model oil (dodecane doped with naphthenic acids, TAN 2.00mg/g KOH); and • Crude oil (Chad crude oil (TAN 3.91 mg/g KOH)) tonie Liquids
A sériés of alkylcarbonate and hydrogencarbonate ionic liquids based on a tetraalkylammonium cation were chosen for the extraction of naphthenic acids from model and crude oil. The ionic liquids were produced using known methods.
Experimental Procedures
General procedure for the removal of naphthenic acids using bases with model/crude oil in a solid-liquid or liquid-liquid extraction
To a sample vial containing 100g of model/crude oil (TAN 2.00mg KOH/g and TAN 3.91 respectively) was added the specified mass of ionic liquid. The resulting mixture was stirred for the desired length of time at the specified température. For the liquid-liquid and solid-liquid extractions, the sample was centrifuged at 3000 rpm for 10 minutes. After séparation of the phases, -5.00-10.00g of the model/crude oil was taken and analysed by titration.
-32Genera/ procedure for the recycling ofthe Ionie liquids and the solid Systems
After phase séparation, to the résultant lower layer was added 10ml of water saturated with CO2. This was stirred for ten minutes and then the cloudy solution was centrifuged at 3000 rpm for 60 minutes. For the ionic liquid extractions the upper oil phase was removed and the lower aqueous phase was dried to leave the ionic liquid which was recycled according to the general procedure above. For the supported ionic liquid Systems both the oil and aqueous phase were removed before drying of the solid prior to recycle.
Unsupported basic ionic liquide
Two basic ionic liquids derived from methylcarbonate and hydrogencarbonate were tested with the crude oil sample, and the results are shown in Table 1 below.
Table 1: Résultant TAN number upon extraction of ~100g of crude oil with [Ni,2,212][MeCO3] and [N1>2,212] [HCO3]
| Entry | IL | IL mass (g) | m Moles of IL | OIL/IL Mass ratio | Crude Oil Résultant TAN |
| 1 | [N1A2.2][MeCO3] | 1.38 | 7.2 | 72 | <0.1 |
| 2 | [Ni,212,2][HCO3] | 1.27 | 7.2 | 79 | <0.1 |
The results clearly demonstrate that for both the methyl and hydrogencarbonate Systems an IL:OlL mass ratio of -1:75 is capable of reducing naphthenic acids in the crude to below 0,1mg/g.
Similar results were obtained for tests using the [N1i4.4<4][HCO3] Ni,4.4,4][MeCO3] ionic liquids. \)Y
-33Recycling of unsupported basic ionic liquids
The application of ionic liquids as reagents to remove naphthenic acids from oil was further explored by subjecting these reagents to recycle.
Table 2 (below) demonstrates the advantages of régénération via a carbonic acid wash in accordance with an aspect of the présent inventions, versus non-regeneration. Two basic ionic liquids derived from methyl and hydrogencarbonate were used.
Table 2 Comparison of regenerative and non-regenerative recycle of [Ni,2,2,2][MeCO3] and [N1>222] [HCO3] on resulting TAN numbers in crude oil
| Ionic liquid 7.2mmol | Non-regenerated (mg/g KOH) | Carbonic wash (mg/g KOH) | ||
| 1 | 2 | 1 | 2 | |
| [Ni,2,2i2][MeCO3] | <0.1 | 3.9 | <0.1 | 0.45 |
| [Ν,.2,2.2] [HCO3] | <0.1 | 3.87 | <0.1 | 0.23 |
In both ionic liquids studied the resulting TAN number shows no decrease where the alkylcarbonate ionic liquid is recycled without régénération. In clear contrast, the use of carbonic acid régénération of the alkylcarbonate ionic liquids results in good activity being retained,
The results demonstrate a cheap and facile process for basic ionic liquid recycling.
Supported basic ionic liquids [N1.2.2.2HHCO3], [N1i2(2.2][MeCO3] and [N^xHMeCOs] ionic liquids were supported onto silica (IL:SiO2 mass 1:2) by wet imprégnation and its performance compared at various ionic liquid to oil mass ratios (see Table 3 below).
-34Table 3: Résultant TAN number upon extraction of ~100g of model oil at 20°C for different silica supported ionîc liquids
| Entry | Ionic liquid | IL mass (g) | mMoles of IL | OIL/IL Mass ratio | Model Oil Résultant TAN |
| 1 | [Ni.2.2.2][HCO3] | 0.635 | 3.5 | 157 | <0.1 |
| 2 | [Ni,2,2,2][MeCO3] | 0.69 | 3.6 | 145 | <0.1 |
| 3 | [N1A4,4][MeCO3] | 0.98 | 3.6 | 102 | <0.1 |
The results in table 3 demonstrate that supported basic ionîc liquids can also be used for naphthenic acid removal.
Covalently bound ionic liquids
The use of covalently bound ionic liquids for solid adsorption of naphthenic acids has also been explored using covalently bound ionic liquids, such as an alkylammonium propyl silicas (see Structure 1 below), results of which are shown in Table 4 (also below).
Structure 1: Structure of the covalently ‘tethered’ aminopropyl silica
(CH2)3
As was noted with the physisorbed supported basic ionic liquids, the chemisorbed supported ionic liquids hâve also been shown to reduce naphthenic acids content in both model oil and crude oil Systems. A major advantage of this System is that the aminopropyl silicas negate reagent leaching into the bulk oil.
Table 4: Remaining TAN number after extraction of the liquid phase when using covalently bound basic ionic liquids
| Supported IL | N loading | TAN | TAN |
| (0.25g) | (mmol g'1) | Model Oil * | Crude Oil* |
| [SiO2-NH3] [HCO3] | 1.01 | <0.1 | 3.37 |
| [SiO2-NEt3] [HCO3] | 0.98 | 0.18 | 3.13 |
*reactions conducted using 7g of oil
Recycling of basic solids
Similar to the basic ionic liquid recycle experiments, régénération of the chemisorbed basic ionic liquid can also be achieved with the use of carbonic acid (see Table 5 below).
Table 5: Recycle of the covalently bound basic ionic liquid/model oil using carbonic wash
| Silica 0.25g | Non-regenerated | Carbonic wash | ||
| TAN 1 | TAN 2 | TAN 1 | TAN 2 | |
| [SiO2-NEt3] [HCO3] | 0.12 | 1.83 | 0.17 | 0.31 |
Bound IL [SiO2-NEt3] [HCO3] shows similar activity after régénération compared to the initial experiments. In contrast without régénération the extraction ability of these solids decreases significantly.
Conclusion
The use of the selected alkylcarbonate or hydrogencarbonate basic ionic liquids of the présent inventions allows for TAN levels in crude oil to be reduced to <0.1 with OIL/IL ratios as high as -80.
Solid supporting of these ionic liquids, such as for example alkylammonium and alkylcarbonates, also allows a significant naphthenic acid réduction to be achieved.
The use of covalently bound basic ionic liquids can also be employed as supported
-36reagents to remove naphthenic acids from crude oil.
Both the supported ionic liquid and covalently bound basic ionic liquids reagents can be effectively recycled after use by simple régénération using carbonic acid. — ?2’MAI 2013 BREME LYSAGHT Sar!
Claims (22)
1. A process for removing organic acids from a crude oil and/or a crude oil distillate containing organic acids comprising the steps of:
(i) contacting the crude oil and/or the crude oil distillate containing organic acids with a supported basic ionic liquid having a basic anion selected from hydrogencarbonate or alkylcarbonate, wherein the ionic liquid and the crude oil and/or crude oil distillate are contacted in a mass ratio of from greater than 1:40; and (ii) obtaining a crude oil and/or crude oil distillate product having reduced acidity which is separated from the supported basic ionic liquid.
2. A process according to Claim 1, wherein the ionic liquid and the crude oil and/or the crude oil distillate are contacted in a mass ratio of up to 1:300, such as a mass ratio of up to 1:200.
3. A process according to any one of the preceding claims, wherein the ionic liquid and the crude oil and/or the crude oil distillate are contacted in a mass ratio of from 1:50, such as in a mass ratio offrom 1:100.
4. A process according to any one of the preceding claims, wherein the basic anion is selected from alkylcarbonate anions, wherein the alkyl group of the alkylcarbonate anion comprises from 1 to 20 carbon atoms.
5. A process according to Claim 4, wherein the alkyl group is selected from one or more of methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl and/or decyl, such as selected from methylcarbonate and ethylcarbonate.
6. A process according to any one of the preceding claims, wherein the support is selected from siiica, alumina, carbon, zirconia, alumina-silica, or a zeolite.
7. A process according to any one of the preceding daims, wherein the ionic liquid is adsorbed onto the support in an ionic liquid:support mass ratio of from 10:1 to 1:10, for exampte in an ionic liquid:support mass ratio of from 1:2 to 2:1.
8. A process for removing organic acids from a crude oil and/or a crude oil distillate containing organic acids comprising the steps of:
(i) contacting the crude oil and/or the crude oil distillate containing organic acids with a basic ionic liquid having a basic anion selected from hydrogencarbonate or alkylcarbonate, and further wherein the ionic liquid and the crude oil and/or crude oil distillate are contacted in a mass ratio of from greater than 1:40; and (ii) obtaining a crude oil and/or crude oil distillate product having reduced acidity which is separated from the basic ionic liquid.
9. A process according to Claim 8, wherein the basic anion is selected from alkylcarbonate anions as described in Claim 4.
10. A process according to Claim 1 or Claim 8, wherein the organic acids are naphthenic acids.
11. A process according to any one of the preceding daims, wherein the basic ionic liquid comprises a cation selected or derived from the group consisting of: ammonium, azaannulenium, azathiazolium, benzimidazolium, benzofuranium, benzotriazolium, borolium, cinnolinium, diazabicyclodecenium, diazabicyclononenium, diazabicyclo-undecenium, dithiazolium, furanium, imidazolium, indazolium, indolinium, indolium, morpholinium, oxaborolium, oxaphospholium, oxazinium, oxazolium, /so-oxazolium, oxothiazolium, pentazolium, phospholium, phosphonium, phthalazinium, piperazinium, piperidinium, pyranium, pyrazinium, pyrazolium, pyridazinium, pyridintum, pyrimidinium, pyrrolidinium, pyrrolium, quinazolinium, quinolinium, isoquinolinium, quinoxalinium, selenozolium, sulfonium, tétrazolium, isothiadiazolium, thiazinium, thiazolium, thiophenium, triazadecenium, triazînium,
-39triazolium, and /so-triazolium, such as a cation selected from the group consisting of:
R’
Rb R1 wherein: Ra, Rb, Rc, Rd, Re, Rf and R9 are each independently selected from hydrogen, a to C30, straight chain or branched alkyl group, a C3 to C8 cycloalkyl group, or a C6 to Cio aryl group, wherein said alkyl, cycloalkyl or aryl groups are unsubstituted or may be substituted by one to three groups selected from: Ci to C6 alkoxy, C2 to C12 alkoxyalkoxy, C3 to C8 cycloalkyl, C8 to C10 aryl, -CN, -OH, -SH, - uY
-40NO2, Ce to C10 aryl and C7 to C10 alkaryl, -002(0! to Ce)alkyl, 0C(0)(Ci to Ce)alkyl, or any two of Rb, Rc, Rd, Re and Rf attached to adjacent carbon atoms form a methylene chain -(CH2)q- wherein q is from 3 to 6, or a cation selected from the group consisting of:
[N(Ra)(Rb)(Rc)(Rd)]+, [P(Ra)(Rb)(Rc)(Rd)]+, and [S(Ra)(Rb)(Rc)]+, wherein: Ra, Rb, Rc and Rd are as defined in Claim 11, and more preferably wherein [Cat+] is selected from:
[N(Ra)(Rb)(Rc)(Rd)]+, wherein Ra, Rb, R° and Rd are each independently selected from C! to C8 alkyl.
12. A process according to any one of the preceding daims, wherein the ionic liquid additionally comprises a basic cation represented by the formula:
Cat+-(Z-Bas)n wherein: Cat+ is a positively charged moiety;
Bas is a basic moiety;
Z is a covalent bond joining Caf and Bas, or is a divalent linking group; and n is an integer of from 1 to 3, and for example wherein n is 1; and/or wherein Bas comprises a heterocyclic ring System containing a basic nitrogen atom, preferably wherein Bas represents a group of formula -N(R1)(R2), -P(R1)(R2), -SR3, or -OR3, in which R1 and R2 are independently selected from hydrogen, alkyl, cycloalkyl, aryl and substituted aryl, or, in the case of an -N(R1)(R2) group, R1 and R2 together with the interjacent
-41 nitrogen atom form part of a heterocyclic ring, and R3 is selected from alkyl, cycloalkyl, aryl and substituted aryl, and more specifically wherein R1, R2 and R3 are selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, tertbutyl, n-pentyl, n-hexyl, cyciohexyl, benzyl and phenyl, or, in the case of an -N(R1)(R2) group, R1 and R2 together represent a tetramethylene or pentamethylene group optionally substituted by one or more alkyl groups; and/or wherein Z is a divalent organic radical having from 1 to 18 carbon atoms, preferably wherein Z represents a divalent alkylene radical selected from:
(a) -(CH2-CH2)-, (CH2-CH2-CH2)-, -(CH2-CH2-CH2-CH2)-, -(CH2-CH2-CH2CH2-CH2)-, -(CH2-CH2-CH2-CH2-CH2-CH2)-, -(CH2-CH(CH3))-, and (CH2-CH(CH3)-CH2-CH(CH3))-;
(b) a divalent alkyleneoxyalkylene radical selected from: -(CH2.CH2-OCH2-CH2)-, -(CH2-CH2-O-CH2-CH2-CH2)-, and -(CH2-CH(CH3)-OCH2CH(CH3))-;
(c) a divalent polyoxyethylene radical selected from: -(ΟΗ2ΟΗ2θ)η- where n is an integer in the range 1 to 9 or “(CH2CH(CH3)O)m- where m is an integer in the range 1 to 6; or (d) a divalent alkylenearylene or an alkylenearylenealkylene radical selected from: -(CH2-C6H4)-, and -(CH2-C6H4-CH2)-.
13. A process according to Claim 12, wherein Cat+ represents a heterocyclic ring structure selected from imidazolium, pyridinium, pyrazolium, thiazolium, isothiazolînium, azathiozolium, oxothiazolium, oxazinium, oxazolium, oxaborolium, dithiozolium, triazolium, selenozolium, oxaphospholium, pyrollium, borolium, furanium, thiophenium, phospholium, pentazolium, indolium, indolinium, oxazolium, isooxazolium, isotriazolium, tétrazolium, benzofuranium, dibenzofuranium, pyrimidinium, morpholenium, quinazalinium, azaannulenium, such as wherein [Cat+-Z-Bas] represents:
benzothiophenium, dibenzothiophenium, piperazinium, phthalazinium, thazinium, pyrazinium, pyranium, quinolinium, pyridazinium, annolinium, isoquinolinium, thiadiazolium, piperidinium, quinazolinium, oxazinium and
wherein: Bas and Z are as defined as in any one of claims 4 to 10;
and Rb, Rc, Rd, R®, R’, R9 and Rh are independently selected from hydrogen, a Ci to C4o alkyl group, a C3 to C8 cycloalkyl group, or a Ce to Cio aryl group, wherein said alkyl, cycloalkyl or aryl groups are unsubstituted or may be substituted by one to three groups selected from: Ci to C6 alkoxy, C6 to C10 aryl, CN, OH, NO21 C7 to C30 aralkyl and C7 to C3o alkaryl, or any two of Rb, R°, Rd, R® and Rf attached to adjacent carbon atoms on the ring structure form a methylene chain -(CH2)P- wherein p is an integer from 3 to
5.
14. A process according to Claim 12, wherein Caf-Z-Bas is selected from:
N(Z-Bas)(Rb)(Rc)(Rd)| and
P(Z-Bas)(Rb)(Rc)(Rd)|
-44wherein: Bas and Z are as defined in any one of Claim 12 and each of Rb, Rc, and Rd are independently selected from methyl and ethyl.
15. A process according to any one of the preceding claims, wherein the material to be deacidified is crude oil or a crude oil distillate selected from liquefied petroleum gas, gasoline, gas oil, diesel, jet fuel, kerosene, home heating oil, and mixtures thereof.
16. A process according to any one of the preceding claims, wherein the crude oil and/or crude oil distillate having reduced acid content is separated from the basic ionic liquid containing organic acids by means of a liquid-liquid extraction.
17. A process according to any one of the preceding claims, further comprising recovering the basic ionic liquid, and may comprise recovering the basic ionic liquid from the organic acids by way of a régénération process, such as wherein the régénération process comprises:
1. contacting the basic ionic liquid with an acid, for example carbonic acid, having a pKa of less than 6.75, and optionally further comprises the steps of:
2. contacting the mixture of step (a) with a solvent which is immiscible with the basic ionic liquid; and
3. separating the solvent from the ionic liquid.
18. A process according to Claim 17, wherein the pKa ofthe acid is less than 6.25.
19. A process according to Claim 1, for removing organic acids from a crude oil and/or a crude oil distillate containing organic acids comprising the steps of:
(i) contacting the crude oil and/or the crude oil distillate containing organic acids with a supported ionic liquid having the formula:
[SUPPORT-Z-Cat+] [χη
-45wherein: SUPPORT represents a solid support;
Z is a divalent linking group (such as those described in Claim 12;
[Cat+] is a cationic moiety; and [X ] is an anion selected from alkylcarbonates (such as those described in Claim 4 or 5) and hydrogen carbonate; and separating a crude oil and/or crude oil distillate product having reduced acidity from the solid supported ionic liquid, wherein:
[SUPPORT- Z-Cat+] may be selected from:
Z \
SUPPORT and
-47unsubstituted or may be substituted by one to three groups selected from: Ci to Ce alkoxy, Ce to CiOaryl, CN, OH, NO2, C7 to C30 aralkyl and C7 to C30 alkaryl, or any two of Rb, Rc, Rd, R® and Rf attached to adjacent carbon atoms form a methylene chain (CH2)q- wherein q is from 8 to 20, or an acyclic moiety, and comprises or consists of a group selected from amino amidino, imino, guanidino, phosphino, arsino, stibino, alkoxyalkyl, alkylthio, alkylseleno and phosphinimino, and may be selected from:
N(Z-SUPPORT)(Rb)(R and
P(Z-SUPPORT)(Rb)(R wherein: SUPPORT, Z, Rb, Rc, and Rd are as defined in Claim 19, and preferably wherein [SUPPORT-Z-Cat+] is selected from:
wherein: SUPPORT and Z are as defined in Claim 19.
20. A process according to Claim 19, wherein [SUPPORT-Z-Cat+] is:
wherein: SUPPORT and Z are as defined in Claim 19.
21. A process according to Claim 19, wherein the solid support is selected from silica, alumina, carbon, zirconia, alumina-silica, and a zeolite.
22. A crude oil/crude oil distillate having reduced acid content, and produced in accordance with the processes of any one of the preceding daims.
?2 MAI 2013
EKEMEUSAGHT Sari
YAQUNDE <
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1020029.3 | 2010-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| OA16433A true OA16433A (en) | 2015-10-15 |
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