WO2021133887A1 - Circular economy for plastic waste to polyethylene and lubricating oil via crude and isomerization dewaxing units - Google Patents
Circular economy for plastic waste to polyethylene and lubricating oil via crude and isomerization dewaxing units Download PDFInfo
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- WO2021133887A1 WO2021133887A1 PCT/US2020/066799 US2020066799W WO2021133887A1 WO 2021133887 A1 WO2021133887 A1 WO 2021133887A1 US 2020066799 W US2020066799 W US 2020066799W WO 2021133887 A1 WO2021133887 A1 WO 2021133887A1
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- fraction
- unit
- pyrolysis
- naphtha
- oil
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- -1 polyethylene Polymers 0.000 title claims abstract description 96
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 65
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 65
- 238000006317 isomerization reaction Methods 0.000 title claims abstract description 18
- 239000010687 lubricating oil Substances 0.000 title claims description 9
- 239000013502 plastic waste Substances 0.000 title description 4
- 238000000197 pyrolysis Methods 0.000 claims abstract description 174
- 229920003023 plastic Polymers 0.000 claims abstract description 90
- 239000004033 plastic Substances 0.000 claims abstract description 90
- 239000002699 waste material Substances 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 83
- 230000008569 process Effects 0.000 claims abstract description 71
- 239000002199 base oil Substances 0.000 claims abstract description 39
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000005977 Ethylene Substances 0.000 claims abstract description 28
- 239000004743 Polypropylene Substances 0.000 claims abstract description 28
- 229920001155 polypropylene Polymers 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 9
- 229920000098 polyolefin Polymers 0.000 claims abstract description 9
- 239000001273 butane Substances 0.000 claims abstract description 8
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims abstract description 8
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000001294 propane Substances 0.000 claims abstract description 8
- 238000010924 continuous production Methods 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 100
- 239000000446 fuel Substances 0.000 claims description 53
- 239000003502 gasoline Substances 0.000 claims description 36
- 229930195733 hydrocarbon Natural products 0.000 claims description 29
- 150000002430 hydrocarbons Chemical class 0.000 claims description 29
- 239000004215 Carbon black (E152) Substances 0.000 claims description 22
- 239000000356 contaminant Substances 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 10
- 239000010779 crude oil Substances 0.000 claims description 7
- 238000004821 distillation Methods 0.000 abstract description 15
- 239000000047 product Substances 0.000 description 53
- 239000001993 wax Substances 0.000 description 53
- 239000003054 catalyst Substances 0.000 description 28
- 239000012535 impurity Substances 0.000 description 23
- 229920000642 polymer Polymers 0.000 description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 239000007789 gas Substances 0.000 description 15
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- 238000009835 boiling Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000002283 diesel fuel Substances 0.000 description 12
- 238000004064 recycling Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 10
- 230000001050 lubricating effect Effects 0.000 description 10
- 229910052717 sulfur Inorganic materials 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 238000005984 hydrogenation reaction Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 150000002739 metals Chemical class 0.000 description 8
- 229910052755 nonmetal Inorganic materials 0.000 description 8
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 8
- 229910021536 Zeolite Inorganic materials 0.000 description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 7
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 239000004700 high-density polyethylene Substances 0.000 description 7
- 239000010457 zeolite Substances 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000004517 catalytic hydrocracking Methods 0.000 description 6
- 229920001684 low density polyethylene Polymers 0.000 description 6
- 239000004702 low-density polyethylene Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 5
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 5
- 229910052794 bromium Inorganic materials 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 150000001336 alkenes Chemical class 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000003915 liquefied petroleum gas Substances 0.000 description 4
- 239000012263 liquid product Substances 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 229920013716 polyethylene resin Polymers 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000004820 halides Chemical class 0.000 description 3
- 229920000092 linear low density polyethylene Polymers 0.000 description 3
- 239000004707 linear low-density polyethylene Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 150000002843 nonmetals Chemical class 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000005292 vacuum distillation Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 229910003294 NiMo Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000029936 alkylation Effects 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 238000002038 chemiluminescence detection Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 1
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004231 fluid catalytic cracking Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000004508 fractional distillation Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000012934 organic peroxide initiator Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012776 robust process Methods 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000004230 steam cracking Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 1
- 229910021654 trace metal Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/002—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/02—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
- C07C4/04—Thermal processes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/22—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by depolymerisation to the original monomer, e.g. dicyclopentadiene to cyclopentadiene
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/148—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound
- C07C7/14833—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound with metals or their inorganic compounds
- C07C7/1485—Purification; Separation; Use of additives by treatment giving rise to a chemical modification of at least one compound with metals or their inorganic compounds oxides; hydroxides; salts
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/02—Ethene
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/10—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal from rubber or rubber waste
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
- C10G45/58—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to change the structural skeleton of some of the hydrocarbon content without cracking the other hydrocarbons present, e.g. lowering pour point; Selective hydrocracking of normal paraffins
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G69/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process
- C10G69/14—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process plural parallel stages only
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/34—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts
- C10G9/36—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts with heated gases or vapours
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/02—Well-defined hydrocarbons
- C10M105/04—Well-defined hydrocarbons aliphatic
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
-
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Definitions
- U.S. Pat. No. 3,845,157 discloses cracking of waste or virgin polyolefins to form gaseous products such as ethylene/olefm copolymers which are further processed to produce synthetic hydrocarbon lubricants.
- U.S. Pat. No. 4,642,401 discloses the production of liquid hydrocarbons by heating pulverized polyolefin waste at temperatures of 150-500° C. and pressures of 20-300 bars.
- U.S. Pat. No. 5,849,964 discloses a process in which waste plastic materials are depolymerized into a volatile phase and a liquid phase.
- the volatile phase is separated into a gaseous phase and a condensate.
- the liquid phase, the condensate and the gaseous phase are refined into liquid fuel components using standard refining techniques.
- U.S. Pat. No. 6,143,940 discloses a procedure for converting waste plastics into heavy wax compositions.
- U.S. Pat. No. 6,150,577 discloses a process of converting waste plastics into lubricating oils.
- EP0620264 discloses a process for producing lubricating oils from waste or virgin polyolefins by thermally cracking the waste in a fluidized bed to form a waxy product, optionally using a hydrotreatment, then catalytically isomerizing and fractionating to recover a lubricating oil.
- Other documents which relate to processes for converting waste plastic into lubricating oils include U.S. Patent Nos. 6,288,296; 6,774,272; 6,822,126; 7,834,226; 8,088,961;
- a continuous process for converting waste plastic into recycle for polyethylene polymerization comprises selecting waste plastics containing polyethylene and/or polypropylene and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent.
- the pyrolyzed effluent is separated into offgas, a naphtha/diesel fraction, a heavy fraction, and char.
- a straight run naphtha (Cs-Cs) fraction is recovered from the crude unit distillation column and passed to a steam cracker for ethylene production.
- the heavy fraction from the pyrolysis unit can be passed to an isomerization dewaxing unit to produce a base oil.
- a continuous process for converting waste plastic comprising polyethylene into recycle for polyethylene polymerization comprises selecting waste plastics containing polyethylene and polypropylene and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent.
- the pyrolyzed effluent is separated into offgas, a naphtha/diesel fraction, a heavy fraction, and char.
- the naphtha/diesel fraction is passed to a crude unit in a refinery from which is recovered a propane and butane (C3-C4) fraction.
- the (C3-C4) fraction is passed to a steam cracker for ethylene production.
- the heavy fraction from the pyrolysis unit can be passed to an isomerization dewaxing unit to produce a lubricating base oil.
- the refinery will generally have its own hydrocarbon feed flowing through the refinery units.
- the flow volume of naphtha/diesel or a waxy heavy fraction generated from the pyrolysis of waste plastic to the refinery units can comprise any practical or accommodating volume % of the total flow to the refinery units.
- the flow of fractions generated from the waste plastic pyrolysis for practical reasons, can be up to about 50 vol. % of the total flow, i.e., the refinery flow and the fraction flow.
- the flow of the naphtha/diesel is an amount up to about 20 vol. % of the total flow.
- FIG. 1 depicts the current practice of pyrolyzing waste plastics to produce fuel or wax (base case).
- FIG. 2 depicts a present process for establishing a circular economy for waste plastics.
- FIG. 3 depicts the plastic type classification for waste plastics recycling.
- Ethylene is the most produced petrochemical building block. Ethylene is produced in hundreds of millions of tons per year via steam cracking.
- the steam crackers use either gaseous feedstocks (ethane, propane and/or butane) or liquid feedstocks (naphtha or gas oil). It is a noncatalytic cracking process operating at very high temperatures, up to 850° C.
- Polyethylene is used widely in various consumer and industrial products. Polyethylene is the most common plastic, over 100 million tons of polyethylene resins are produced annually. Its primary use is in packaging (plastic bags, plastic films, geomembranes, containers including bottles, etc.). Polyethylene is produced in three main forms: high-density polyethylene (HDPE, ⁇ 0.940-0.965 g/cm 3 ), linear low-density polyethylene (LLDPE, ⁇ 0.915- 0.940 g/cm 3 ) and low-density polyethylene (LDPE, ( ⁇ 0.930 g/cm 3 ), with the same chemical formula (C2H4)n but different molecular structure.
- HDPE high-density polyethylene
- LLDPE linear low-density polyethylene
- LDPE low-density polyethylene
- HDPE has a low degree of branching with short side chains while LDPE has a very high degree of branching with long side chains.
- LLDPE is a substantially linear polymer with significant numbers of short branches, commonly made by copolymerization of ethylene with short-chain alpha-olefins.
- Low density polyethylene is produced via radical polymerization at 150 - 300° C and very high pressure of 1,000-3,000 atm. The process uses a small amount of oxygen and/or organic peroxide initiator to produce polymer with about 4,000 - 40,000 carbon atoms per the average polymer molecule, and with many branches.
- High density polyethylene (HDPE) is manufactured at relatively low pressure (10-80 atm) and 80-150° C temperature in the presence of a catalyst.
- Ziegler-Natta organometallic catalysts titanium(III) chloride with an aluminum alkyl
- Phillips-type catalysts chromium(IV) oxide on silica
- Hydrogen is mixed with ethylene to control the chain length of the polymer.
- Manufacturing conditions of linear low-density polyethylene (LLDPE) are similar to those of HDPE except copolymerization of ethylene with short-chain alpha- olefins (1 -butene or 1 -hexene).
- FIG. 1 shows a diagram of pyrolysis of waste plastics fuel or wax that is operated in the industry today.
- polyethylene and polypropylene wastes are sorted together 1.
- the cleaned polyethylene/polypropylene waste 2 is converted in a pyrolysis unit 3 to offgas 4 and pyrolysis oil (liquid product).
- the offgas 4 from the pyrolysis unit is used as fuel to operate the pyrolysis unit, and only the pyrolysis unit is used for commercial purposes.
- An on-site distillation unit separates the pyrolysis oil to produce naphtha and diesel 5 products which are sold to fuel markets.
- the heavy pyrolysis oil fraction 6 is recycled back to the pyrolysis unit 3 to maximize the fuel yield.
- Char 7 is removed from the pyrolysis unit 3.
- the heavy fraction 6 is rich in long chain, linear hydrocarbons, and is very waxy (i.e., forms paraffinic wax upon cooling to ambient temperature). Wax can be separated from the heavy fraction 6 and sold to the wax markets.
- the present process converts pyrolyzed polyethylene and/or polypropylene waste plastic in large quantities by integrating the waste polymer pyrolysis product streams into an oil refinery operation.
- the resulting processes produce the feedstocks for the polymers (naphtha or C3-C4 for ethylene cracker), high quality gasoline and diesel fuel, and/or quality base oil.
- Polyethylene is produced via polymerization of pure ethylene. Clean ethylene can be made using a steam cracker. Either naphtha or a C3-C4 stream can be fed to the steam cracker. The ethylene is then polymerized to create polyethylene.
- a pyrolysis unit produces poor quality products containing contaminants, such as calcium, magnesium, chlorides, nitrogen, sulfur, dienes, and heavy components, which products cannot be used in large quantity for blending in transportation fuels. It has been discovered that by having these products go through the refinery units, the contaminants can be captured in pre-treating units and their negative impacts diminished.
- the fuel components can be further upgraded with appropriate refinery units with chemical conversion processes, with the final transportation fuels produced by the integrated process being of higher quality and meeting the fuels quality requirements.
- the present process will upgrade the wax into valuable lubricating base oil.
- the integrated process will generate a much cleaner naphtha stream for steam cracker feedstock for ethylene generation for polyethylene production.
- the carbon in and out of the refinery operations are “transparent,” meaning that all the molecules from the waste plastic do not necessarily end up in the exact olefin product cycled back to the polyolefin plants, but are nevertheless assumed as “credit” as the net “green” carbon in and out of the refinery is positive. With these integrated processes, the amount of virgin feeds needed for polyethylene plants will be reduced significantly.
- FIG. 2 shows the present integrated process, integrating refinery operations with recycle for effective polyethylene production.
- mixed waste plastics are sorted together 21.
- the cleaned waste plastic 22 is converted in a pyrolysis unit 23 to offgas 24 and a pyrolysis oil (liquid product) and optionally wax (solid product at ambient temperature).
- the offgas 24 from the pyrolysis unit can be used as fuel to operate the pyrolysis unit 23.
- the pyrolysis oil is separated, generally by an on-site distillation unit, into a naphtha/diesel fraction 25, and a heavy fraction 26.
- Char 27 is removed from the pyrolysis unit 23 after completion of the pyrolysis step.
- the pyrolysis unit can be located near the waste plastics collection site, which site could be away from a refinery, near a refinery, or within a refinery. If the pyrolysis unit is located away from the refinery, then pyrolysis oil (naphtha/diesel and heavies) can be transferred to the refinery by truck, barge, rail car or pipeline. It is preferred, however, that the pyrolysis unit is within the waste plastics collection site or within the refinery.
- the preferred starting material for the present process is sorted waste plastics containing predominantly polyethylene and polypropylene (plastics recycle classification types 2, 4, and 5).
- the pre-sorted waste plastics are washed and shredded or pelleted to feed to a pyrolysis unit for thermal cracking.
- FIG. 3 depicts the plastic type classification for waste plastics recycling.
- Classification types 2, 4, and 5 are high density polyethylene, low density polyethylene and polypropylene, respectively. Any combination of the polyethylene and polypropylene waste plastics can be used.
- at least some polyethylene waste plastic is preferred.
- Proper sorting of waste plastics is very important in order to minimize contaminants such as N, Cl, and S.
- Plastics waste containing polyethylene terephthalate (plastics recycle classification type 1), polyvinyl chloride (plastics recycle classification type 3) and other polymers (plastics recycle classification type 7) need to be sorted out to less than 5%, preferably less than 1% and most preferably less than 0.1%.
- the present process can tolerate a moderate amount of polystyrene (plastics recycle classification type 6).
- Waste polystyrene needs to be sorted out to less than 30%, preferably less than 20% and most preferably less than 5%.
- Non- metal contaminants include contaminants coming from the Periodic Table Group IV, such as silica, contaminants from Group V, such as phosphorus and nitrogen compounds, contaminants from Group VI, such as sulfur compounds, and halide contaminants from Group VII, such as fluoride, chloride, and iodide.
- the residual metals, non-metal contaminants, and halides need to be removed to less than 50 ppm, preferentially less than 30ppm and most preferentially to less than 5ppm.
- the pyrolyzing is carried out by contacting a plastic material feedstock in a pyrolysis zone at pyrolysis conditions, where at least a portion of the feed(s) is cracked, thus forming a pyrolysis zone effluent comprising 1 -olefins and n-paraffms.
- Pyrolysis conditions include a temperature of from about 400° C to about 700° C, preferably from about 450° C to about 650° C.
- Conventional pyrolysis technology teaches operating conditions of above-atmospheric pressures. See e.g., U.S. Pat. No. 4,642,401. Additionally, it has been discovered that by adjusting the pressure downward, the yield of a desired product can be controlled. See, e.g., U.S. Pat. No. 6,150,577. Accordingly, in some embodiments where such control is desired, the pyrolysis pressure is sub-atmospheric.
- FIG. 2 shows the present integrated process where only the naphtha/diesel fraction 25 from the pyrolysis unit 23 is sent to a crude unit desalter 28 to produce Cs-Cs naphtha 29, preferentially C5-C7 naphtha and most preferentially C5-C6 naphtha for the stream cracker 30 feed.
- the steam cracker 30 creates ethylene 36.
- the ethylene is passed to a polymerization unit 40 to produce polyethylene.
- the polyethylene is used for polyethylene consumer products 41.
- the refinery will generally have its own hydrocarbon feed flowing through the refinery units.
- the flow volume of naphtha/diesel generated from the pyrolysis of waste plastic to the refinery units, here a crude unit can comprise any practical or accommodating volume % of the total flow to the refinery units.
- the flow of the naphtha/diesel fraction generated from the waste plastic pyrolysis for practical reasons, can be up to about 50 vol. % of the total flow, i.e., the refinery flow and the naphtha/diesel flow.
- the flow of the naphtha/diesel is an amount up to about 20 vol. % of the total flow.
- the flow of the naphtha/diesel is an amount up to about 10 vol. % of the total flow. About 20 vol. % has been found to be an amount that is quite practical in its impact on the refinery while also providing excellent results and being an amount that can be accommodated.
- the amount of naphtha/diesel generated from the pyrolysis can of course be controlled so that the fraction passed to the refinery units provides the desired volume % of the flow. Flow of the heavy wax fraction to the dewaxing unit can similarly be controlled and/or adjusted.
- the refinery crude unit separates crude oil into multiple fractions such as liquefied petroleum gas (LPG), naphtha, kerosene, diesel and gas oil which will be further treated into useful petroleum products.
- the refinery crude unit has a crude treating section, commonly known as a desalter, and a crude oil distillation or fractionation section.
- the distillation section typically includes an atmospheric distillation unit and vacuum distillation unit.
- the naphtha/diesel fraction from the pyrolysis unit is fed to the desalter to remove the salts and solids contained in the oil to protect downstream equipment from the harmful effects of the contaminants.
- water is mixed with the oil and typically heated to temperatures between about 215° F to about 280° F and allowed to separate in the desalter unit.
- Desalted oil is sent to an atmospheric distillation unit heated to about 340-372° C (644- 700° F) at the bottom of the distillation column, and liquid is removed at various points of the fractional distillation column to produce various fuels.
- the fuels from the crude units are sent to various upgrading units in the refinery to remove impurities (nitrogen, sulfur) and to catalytically transform fractions to improve the product properties, such as octane and cetane numbers.
- the bottom residue from the atmospheric distillation column also known as atmospheric residue, is sent to a vacuum distillation column to produce vacuum gas oil (650 - 1050° F) and vacuum residue.
- the vacuum gas oil may be used to produce lubricating base oil or further cracked to produce gasoline, jet and diesel fuel.
- the steam cracker and ethylene polymerization unit are preferably located near the refinery so that the feedstock (propane, butane, naphtha) can be transferred via pipeline.
- the feedstock can be delivered via truck, barge, rail car or pipeline.
- the heavy naphtha/diesel from the pyrolysis oil can be combined with hydrocarbon from the crude unit distillation and sent as a heavy naphtha, diesel, atmospheric gas oil stream 31 to appropriate refinery units 32 for upgrading into clean gasoline and diesel 33.
- the heavy, waxy pyrolysis oil 26 from the pyrolysis unit is sent to a base oil dewaxing unit 34 with a precious metal containing zeolite catalyst for isomerization dewaxing or hydroisomerization to produce lubricating base oil 35 with excellent viscosity index and pour point.
- the flow of the heavy, waxy fraction can be controlled and adjusted as needed based upon the amount desired to be accommodated.
- the isomerization dewaxing unit converts paraffinic, waxy heavy hydrocarbon material, typically boiling about 650° F, to high viscosity index (VI) lube oils.
- the unit typically comprises a feed hydrotreating section, isomerization dewaxing section, and distillation section.
- the feed to the dewaxing unit is preferably subjected first to hydrogenation in a hydrotreating step.
- the hydrotreating occurs as part of the dewaxing unit.
- the feed to the hydrotreating step removes a significant portion of any nitrogen-containing, sulfur-containing, and/or oxygen-containing contaminants.
- the hydrotreating step also saturates portions of olefins, dienes and aromatics to improve the quality of the feed to the dewaxing unit.
- Typical hydrotreating conditions which are employed to remove contaminants while avoiding cracking include temperatures ranging from about 190° C (374° F) to about 340° C (644° F), pressure ranging from about 400 psig to about 3000 psig, space velocities (LHSV) in the range of about 0.1 hr 1 to about 20 hr 1 , and hydrogen recycle rates ranging from about 400 to about 15,000 SCF/B.
- Hydrotreating catalysts include those conventionally used in hydrotreating units, containing metals such as Ni, Mo, Co, W and porous supports such as alumina, silica, or silica- alumina.
- the hydrotreated heavy hydrocarbon is sent to the dewaxing reactor with an isomerization dewaxing catalyst which contains noble metal, intermediate pore size molecular sieve and binder.
- the catalyst preferably contains an intermediate pore size (10-membered ring) molecular sieve such as ZSM-23, ZSM-35, ZSM-48, ZSM-5, SSZ-32, SSZ-91, SAPO-11, SAPO-31 and SAPO-41.
- the noble metal includes Group VIII metals, such as Pt, Pd or mixture of Pt and Pd.
- porous alumina or silica is used to bind the material to produce catalyst pellets for the fixed bed reactor.
- Typical reaction conditions for the dewaxing reactor include temperature range of 200° C (392° F) to about 475° C (887° F), pressure ranging from about 200 psig to about 3000 psig, space velocities (LHSV) in the range of about 0.2 hr 1 to about 10 hr 1 , and hydrogen recycle rates ranging from about 400 to about 15,000 SCF/B.
- the isomerization dewaxing catalyst converts n-paraffms to iso-paraffins, thereby reducing the pour point of the resulting oils and to form a high VI lube oil.
- the effluent hydrocarbon from the isomerization dewaxing section is sent to a distillation unit to separate the effluent into various oil fractions, for example, a base oil fraction which boils above -650° F, a diesel fraction which boils about 300 - 700° F, and a gasoline fraction boils which about 80 - 400° F.
- a base oil fraction which boils above -650° F
- a diesel fraction which boils about 300 - 700° F
- a gasoline fraction boils which about 80 - 400° F.
- the boiling points for the gasoline, jet and diesel fractions will be adjusted depending on the season and local specifications.
- a C3-C4 fraction 37 is recovered from the refinery crude unit 28.
- the stream can also be fed to a steam cracker 30 for the production of ethylene 36.
- the ethylene can then be polymerized 40 and made into consumer products 41.
- Example 1 Properties of Pyrolysis Oil and Wax From Commercial Sources
- Pyrolysis oil and wax samples were obtained from commercial sources and their properties are summarized in Table 1. These pyrolysis samples were prepared from waste plastics containing mostly polyethylene and polypropylene via thermal decomposition in a pyrolysis reactor at around 400-600° C, near atmospheric pressure without any added gas or a catalyst.
- a pyrolysis unit typically produces gas, liquid oil product, optionally wax product, and char.
- the pyrolysis unit ’s overhead gas stream containing thermally cracked hydrocarbon was cooled to collect condensate as pyrolysis oil (liquid at ambient temperature) and/or pyrolysis wax (solid at ambient temperature).
- the pyrolysis oil is the main product of the pyrolysis units. Some units produce pyrolysis wax as a separate product in addition to the pyrolysis oil.
- ASTM D4052 method was used for specific gravity measurements. Simulated boiling point distribution curve was obtained using ASTM D2887 method. Carlo-Erba analysis for carbon and hydrogen was based on ASTM D5291 method. Bromine number measurement was based on ASTM D1159 method. Hydrocarbon-type analysis was done using a high resolution magnetic mass spectrometer using the magnet scanned from 40 to 500 Daltons. Total sulfur was determined using XRF per ASTM D2622 method. The nitrogen was determined using a modified ASTM D5762 method using chemiluminescence detection. The total chloride content was measured using combustion ion chromatography instrument using modified ASTM 7359 method.
- the oxygen content in naphtha and distillate boiling range was estimated using GC by GC/MS measurements with electron ionization detector for m/Z range of 29-500. Trace metal and non-metal elements in oil were determined using inductively coupled plasma-atomic emission spectrometry (ICP-AES).
- ICP-AES inductively coupled plasma-atomic emission spectrometry
- Industrial pyrolysis process of sorted plastics sourced predominantly from polyethylene and polypropylene waste, produced quality hydrocarbon streams with specific gravity ranging 0.7 to 0.9, and a boiling range from 18 to 1100° F as in pyrolysis oil or pyrolysis wax.
- the pyrolysis product is rather pure hydrocarbon made of mostly carbon and hydrogen.
- the hydrogen to carbon molar ratio varies from 1.7 to near 2.0.
- the Bromine Number is in the range of 14 through 60 indicating varying degrees of unsaturation coming from olefins and aromatics.
- the aromatic content is in the range of 5 to 23 volume % with a higher severity unit producing more aromatics.
- the pyrolysis products show paraffinic content ranging from mid-20 vol. % to mid-50 vol. %.
- the pyrolysis product contains a substantial amount of olefins.
- Samples A and B pyrolysis oil produced under more severe conditions such as higher pyrolysis temperature and/or longer residence time, contain higher aromatic and lower paraffinic components, resulting H/C molar ratio of around 1.7 and high Bromine Number of 50-60.
- Samples C and D were produced at less severe conditions, and the pyrolysis oils are more paraffinic, resulting H/C molar ratio of close to 2.0 and Bromine Number around 40.
- Sample E pyrolysis wax, is mostly paraffinic, saturated hydrocarbon with a substantial amount of normal hydrocarbons (as opposed to branched hydrocarbons) with low Bromine Number of only 14.
- Example 2 Fractionation of Pyrolysis Oil for Evaluation As Transportation Fuel
- Sample D was distilled to produce hydrocarbon cuts representing gasoline (350° F ), jet (350 - 572° F), diesel (572 - 700° F) and the heavy (700° F + ) fractions.
- Table 2 summarizes the boiling point distribution and impurity distributions among the distilled product fractions.
- Example 3 Evaluation of Pyrolysis Oil Cut for Gasoline Fuel
- Sample F a pyrolysis oil cut for gasoline fuel boiling range, was evaluated to assess its potential to use as gasoline fuel.
- Sample F has the carbon number range of C5 - C12, typical of the gasoline fuel.
- Sample F a pyrolysis oil cut for gasoline fuel boiling range, cannot be used by itself as automotive gasoline fuel due to its poor quality.
- the gasoline fraction from the pyrolysis oil showed very poor oxidation stability in that Sample F failed only after 90 min compared to the target stability of longer than 1440 minutes.
- the pyrolysis gasoline exceeded the wash gum target of 4 mg/ 100 mL suggesting severe gum forming tendency.
- the pyrolysis gasoline has poor octane numbers compared to the reference gasoline. A premium unleaded gasoline was used as the reference gasoline.
- Example 4 Evaluation of Pyrolysis Oil Cut for Jet Fuel
- Sample G a pyrolysis oil cut for jet fuel boiling range, was evaluated to assess its potential to use as jet fuel.
- Sample G has the carbon number range of C9 - C18, typical of the jet fuel.
- Example 5 Evaluation of Pyrolysis Oil Cut for Diesel Fuel
- Sample H a pyrolysis oil cut for diesel fuel boiling range, was evaluated to assess its potential to use as diesel fuel.
- Sample H has the carbon number range of C14 - C24, typical of the diesel fuel.
- Sample H contains a substantial amount of normal hydrocarbons. Since normal hydrocarbons tends to exhibit waxy characteristics, cold flow properties such as pour point (ASTM D5950-14) and cloud points (ASTM D5773) were considered as the most critical tests.
- Results from Table 1 showed that industrial pyrolysis process of sorted plastics, sourced predominantly from polyethylene and polypropylene waste, produced quality pyrolysis oil made of mostly carbon and hydrogen. With good sorting and efficient pyrolysis unit operation, the nitrogen and sulfur impurities are at low enough levels that a modem refinery can handle cofeeding of pyrolysis feedstocks to their processing units with no detrimental impacts.
- pyrolysis oils may still contain high amounts of metals (Ca, Fe, Mg) and other non-metals (N, S, P, Si, Cl, O) that could negatively affect the performance of conversion units in a refinery.
- metals Ca, Fe, Mg
- other non-metals N, S, P, Si, Cl, O
- pyrolysis oil products with high impurity levels are preferentially fed to a desalter unit before by the crude unit so that bulk of impurities are removed effectively by the desalter.
- the pyrolysis oil By feeding the pyrolysis feedstock to a crude unit or to a desalter unit before the crude unit, the pyrolysis oil will be fractionated into multiple components and then converted in the subsequent conversion units including paraffin isomerization unit, jet hydrotreating unit, diesel hydrotreating unit, fluid catalytic cracking unit (FCC), alkylation unit, hydrocracking unit and/or coker unit to make gasoline, jet and diesel fuel with satisfactory product properties.
- the conversion units (FCC or hydrocracking unit) will also convert the heavy cut (corresponding to Sample I) into quality transportation fuels.
- Example 7 demonstrates the conversion of waste plastics pyrolysis oil into quality transportation fuel in a refinery conversion unit, using a FCC unit as an example.
- VGO Vacuum gas oil
- the FCC experiments were carried out on a Model C ACE (advanced cracking evaluation) unit fabricated by Kayser Technology Inc. using regenerated equilibrium catalyst (Ecat) from a refinery.
- the reactor was a fixed fluidized reactor using N2 as fluidization gas.
- Catalytic cracking experiments were carried out at the atmospheric pressure and 900° F reactor temperature. The cat/oil ratio was varied between 5 to 8 by varying the amount of the catalyst.
- a gas product was collected and analyzed using a refinery gas analyzer (RGA), equipped with GC with FID detector. In-situ regeneration of a spent catalyst was carried out in the presence of air at 1300° F, and the regeneration flue gas was passed through a LECO unit to determine the coke yield.
- RAA refinery gas analyzer
- the FCC unit cracks the pyrolysis oil info fuel range hydrocarbons, reduces impurities, and isomerize n-paraffins to isoparaffins. All these chemistry will improve the fuel properties of the pyrolysis oil and wax.
- the FCC process unit By cofeeding the pyrolysis oil through the FCC process unit with a zeolite catalyst, the oxygen and nitrogen impurities in the fuel range were reduced substantially, from about 300-1400 ppmN to about 30 ppmN and from about 250-540 ppm O to about 60-80 ppm O.
- the hydrocarbon composition of all these cofeeding products are well within the typical FCC gasoline range.
- the FCC runs of 100% pyrolysis oil showed substantial debits of Octane numbers by about 13-14 numbers. This shows that coprocessing of pyrolysis oil is preferred over processing of pure 100% pyrolysis oil.
- Example 8 Generation of C3-C4 and Naphtha Feedstocks for Chemicals Production via Cofeeding of Waste Plastics Pyrolysis Product to Refinery Crude Unit
- the pyrolysis oil By feeding of the pyrolysis oil to a crude unit or to a desalter unit before the crude unit, the pyrolysis oil will be fractionated into multiple components. With the pyrolysis oil cofeeding, the refinery crude unit produces substantial amounts of clean propane, butane, and naphtha streams with recycle contents that can be fed to a steam cracker. At least a portion of the streams, if not all, are fed to the steam cracker.
- Example 9 Feeding of Recycled C3-C4 and/or Naphtha to Steam Cracker for Ethylene Production, followeded by Production of Circular Polyethylene Resin and Polyethylene Consumer Products
- the propane, butane and naphtha streams produced via cofeeding of pyrolysis products to a crude unit per Example 8 are good feedstock to cofeed to a steam cracker for production of ethylene with a recycle content.
- the ethylene is then processed in a polymerization unit to produce polyethylene resin containing some recycled-polyethylene/ polypropylene derived materials while the quality of the newly produced polyethylene is indistinguishable to the virgin polyethylene made entirely from virgin petroleum resources.
- the polyethylene resin with the recycled material is then further processed to produce various polyethylene products to fit the needs of consumer products.
- These polyethylene consumer products now contain chemically recycled, circular polymer while qualities of the polyethylene consumer products are indistinguishable from those made entirely from virgin polyethylene polymer.
- These chemically recycled polymer products are different from the mechanically recycled polymer products whose qualities are inferior to the polymer products made from virgin polymers.
- Results from Table 1 showed that industrial pyrolysis process of sorted plastics, sourced predominantly from polyethylene and polypropylene waste, produced pyrolysis wax made of mostly carbon and hydrogen.
- Various process options were examined for making lubricating base oil from the pyrolysis wax via hydroisomerization dewaxing process.
- the pyrolysis wax still contain too high amounts of nitrogen and sulfur impurities, metals (Ca, Fe, Mg) and other non-metals (P, Si, Cl, O) that negatively affect the performance of the hydroisomerization dewaxing catalyst containing precious metal (Pt, Pd, or a combination of Pt and Pd) and a zeolite such as ZSM-11, ZSM-23, ZSM-48, SSZ-32, SSZ-91, SAPO-11, SAPO-31 and SAPO-41.
- precious metal Pt, Pd, or a combination of Pt and Pd
- a zeolite such as ZSM-11, ZSM-23, ZSM-48, SSZ-32, SSZ-91, SAPO-11, SAPO-31 and SAPO-41.
- the volume percent limitation is likely coming from the nitrogen impurity which is detrimental to the zeolite activity.
- the nitrogen level of the combined feed needs to be maintained at less than 5 ppm nitrogen, preferentially less than 1 ppm nitrogen.
- the pyrolysis wax is cofed to a hydrocracking unit to remove S, N, and other impurities.
- the hydrocracking unit hydrogenates the pyrolysis wax and removes impurities.
- the hydrocracking unit severity may be adjusted to maximize the base oil yield of the combined feed.
- Cofeeding level to the hydrocracking unit can be as much as 50 vol. %, preferentially 20 vol. %. In this case, the volume percent limitation may come from the metals impurity or N impurity or P impurity depending on the unit configuration and the catalyst choice.
- the bottom fraction (650° F+) containing hydrocracked pyrolysis wax is then fed to the hydroisomerization dewaxing unit to make a lubricating base oil.
- the pyrolysis wax is fed to a dedicated hydrogenation unit to remove S, N, and other impurities before fed to the hydroisomerization dewaxing unit to make a base oil.
- the hydrogenation step removes impurities very easily, as shown in Example 12 below.
- the hydrotreated wax can be cofed to the hydroisomerization dewaxing at any volume percent.
- Example 11 Production of Base Oil from Recycled Pyrolysis Wax via Hydroisomerization Dewaxing Process Only
- Sample E crude pyrolysis wax
- Sample J 100% Sample J was hydroisomerized in a batch autoclave unit with a Pt/SSZ-32/Alumina catalyst overnight at an oil to catalyst weight ratio of 10:1, at 650° F and under 800 psig 3 ⁇ 4 pressure.
- the hydrogenated product was vacuum distilled to produce 690° F + boiling and clear oil, Sample K. Properties of the samples are summarized in Table
- Sample J 690° F + cut slack wax from waste plastic pyrolysis, is low-viscosity wax at ⁇ 4.3 cSt at 100° C with an excellent viscosity index of 169.
- the slack wax contains significant amounts of N (180 ppm) and P (32.5 ppm) which will passivate the zeolite catalyst activity in the hydroisomerization dewaxing process.
- Sample K dewaxed and distilled oil, showed viscosity index of 162 and the pour point of 12° C. Even though the pour point was reduced substantially from 42° C of Sample E, the pour point of 12° C is still very poor relative to the industry target of -15° C or below.
- Example 12 Production of Quality Base Oil with Recycle Content by Hydrotreating followeded by Hydroisomerization Dewaxing Process
- Sample E crude pyrolysis wax
- a liquid feed flow rate of 1.5 hr 1 relative to the catalyst bed volume and H2/Hydrocarbon flow rate of 2500 scf/bbl were used to produce the hydrogenated product, which is mostly wax.
- the hydrogenated product was vacuum distilled to produce 650° F + fraction as a hydrogenated pyrolysis paraffin wax, Sample L.
- Sample L hydrogenated wax made from waste plastics pyrolysis
- a continuous fixed bed unit containing a Pt/ZZS-91/Alumina catalyst at 625° F reactor temperature and 400 psig pressure.
- a liquid feed flow rate of 1.0 hr 1 relative to the catalyst bed volume and H2/Hydrocarbon flow rate of 2500 scf/bbl were used to produce the dewaxed oil.
- the dewaxed oil was vacuum distilled to produce 690° F + fraction as the final dewaxed base oil product, Sample M. The results are summarized in Table 8.
- the Examples 11 and 12 clearly show that excellent quality base oil can be made from the wax derived from pyrolysis of polyethylene and polypropylene waste with careful selection of cofeeding process configuration and process conditions.
- the results clearly show that the preferred way to make a base oil from a waste plastics pyrolysis wax is by hydrogenation followed by hydroisomerization dewaxing process.
- the final base oil produced has a recycle content, and the quality of the base oil is comparable or superior to that of base oil produced by the conventional refinery processing with virgin crude oil.
- the word “comprises” or “comprising” is intended as an open-ended transition meaning the inclusion of the named elements, but not necessarily excluding other unnamed elements.
- the phrase “consists essentially of’ or “consisting essentially of’ is intended to mean the exclusion of other elements of any essential significance to the composition.
- the phrase “consisting of’ or “consists of’ is intended as a transition meaning the exclusion of all but the recited elements with the exception of only minor traces of impurities.
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JP2022538699A JP2023508352A (en) | 2019-12-23 | 2020-12-23 | Circular economy of waste plastics into polyethylene and lubricants via crude and isomerization dewaxing units |
EP20906913.7A EP4093838A4 (en) | 2019-12-23 | 2020-12-23 | Circular economy for plastic waste to polyethylene and lubricating oil via crude and isomerization dewaxing units |
CN202080089653.5A CN114901781B (en) | 2019-12-23 | 2020-12-23 | Recycling economy for converting plastic waste into polyethylene and lube oils by a crude unit and an isomerization dewaxing unit |
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WO2020152329A1 (en) * | 2019-01-24 | 2020-07-30 | Sabic Global Technologies B.V. | Process for the preparation of polymers from waste plastic feedstocks |
WO2021087032A1 (en) * | 2019-10-31 | 2021-05-06 | Eastman Chemical Company | Processes and systems for formation of recycle-content hydrocarbon compositions |
CA3164223A1 (en) * | 2019-12-23 | 2021-07-01 | Chevron U.S.A. Inc. | Circular economy for plastic waste to polyethylene and lubricating oil via crude and isomerization dewaxing units |
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US20210189252A1 (en) | 2021-06-24 |
KR20220117901A (en) | 2022-08-24 |
EP4093838A1 (en) | 2022-11-30 |
BR112022011767A2 (en) | 2022-08-30 |
CN114901781B (en) | 2024-02-13 |
US11739272B2 (en) | 2023-08-29 |
EP4093838A4 (en) | 2024-01-03 |
CN114901781A (en) | 2022-08-12 |
JP2023508352A (en) | 2023-03-02 |
CA3164223A1 (en) | 2021-07-01 |
CA3222774A1 (en) | 2021-07-01 |
US20230048572A1 (en) | 2023-02-16 |
US11473016B2 (en) | 2022-10-18 |
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