CN117384679A - Waste grease hydrogenation pretreatment purification method - Google Patents
Waste grease hydrogenation pretreatment purification method Download PDFInfo
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- CN117384679A CN117384679A CN202310606521.0A CN202310606521A CN117384679A CN 117384679 A CN117384679 A CN 117384679A CN 202310606521 A CN202310606521 A CN 202310606521A CN 117384679 A CN117384679 A CN 117384679A
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- China
- Prior art keywords
- hydrogenation
- waste grease
- catalyst
- hydrogenation pretreatment
- oil
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- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 85
- 239000002699 waste material Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000004519 grease Substances 0.000 title claims abstract description 54
- 238000000746 purification Methods 0.000 title claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 67
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000001257 hydrogen Substances 0.000 claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000012263 liquid product Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000000047 product Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 27
- 235000019198 oils Nutrition 0.000 claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 239000011593 sulfur Substances 0.000 claims description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 238000005470 impregnation Methods 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 235000019482 Palm oil Nutrition 0.000 claims description 4
- 150000001868 cobalt Chemical class 0.000 claims description 4
- 238000010335 hydrothermal treatment Methods 0.000 claims description 4
- 150000002751 molybdenum Chemical class 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims description 4
- 150000002815 nickel Chemical class 0.000 claims description 4
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 4
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 claims description 4
- 239000002540 palm oil Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- -1 transition metal sulfide Chemical class 0.000 claims description 4
- 150000003657 tungsten Chemical class 0.000 claims description 4
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims description 2
- 239000011609 ammonium molybdate Substances 0.000 claims description 2
- 229940010552 ammonium molybdate Drugs 0.000 claims description 2
- 235000018660 ammonium molybdate Nutrition 0.000 claims description 2
- UYJXRRSPUVSSMN-UHFFFAOYSA-P ammonium sulfide Chemical compound [NH4+].[NH4+].[S-2] UYJXRRSPUVSSMN-UHFFFAOYSA-P 0.000 claims description 2
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 claims description 2
- 235000015278 beef Nutrition 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- 229940011182 cobalt acetate Drugs 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 2
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 2
- OBWXQDHWLMJOOD-UHFFFAOYSA-H cobalt(2+);dicarbonate;dihydroxide;hydrate Chemical compound O.[OH-].[OH-].[Co+2].[Co+2].[Co+2].[O-]C([O-])=O.[O-]C([O-])=O OBWXQDHWLMJOOD-UHFFFAOYSA-H 0.000 claims description 2
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 claims description 2
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims description 2
- 235000019864 coconut oil Nutrition 0.000 claims description 2
- 239000003240 coconut oil Substances 0.000 claims description 2
- 238000003795 desorption Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 235000019197 fats Nutrition 0.000 claims description 2
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 2
- 229910000008 nickel(II) carbonate Inorganic materials 0.000 claims description 2
- ZULUUIKRFGGGTL-UHFFFAOYSA-L nickel(ii) carbonate Chemical compound [Ni+2].[O-]C([O-])=O ZULUUIKRFGGGTL-UHFFFAOYSA-L 0.000 claims description 2
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 2
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 2
- 229920001021 polysulfide Polymers 0.000 claims description 2
- 239000005077 polysulfide Substances 0.000 claims description 2
- 150000008117 polysulfides Polymers 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 229910052723 transition metal Inorganic materials 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 18
- 239000002994 raw material Substances 0.000 abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 9
- 239000001301 oxygen Substances 0.000 abstract description 9
- 150000001875 compounds Chemical class 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003225 biodiesel Substances 0.000 description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000003350 kerosene Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000002283 diesel fuel Substances 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 235000014593 oils and fats Nutrition 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 description 3
- 239000008158 vegetable oil Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910003294 NiMo Inorganic materials 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000012075 bio-oil Substances 0.000 description 2
- 229910001593 boehmite Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- AOPCKOPZYFFEDA-UHFFFAOYSA-N nickel(2+);dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O AOPCKOPZYFFEDA-UHFFFAOYSA-N 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 238000005809 transesterification reaction Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000007848 Bronsted acid Substances 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 208000036828 Device occlusion Diseases 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000012378 ammonium molybdate tetrahydrate Substances 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 238000000508 aqueous-phase reforming Methods 0.000 description 1
- FIXLYHHVMHXSCP-UHFFFAOYSA-H azane;dihydroxy(dioxo)molybdenum;trioxomolybdenum;tetrahydrate Chemical compound N.N.N.N.N.N.O.O.O.O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O FIXLYHHVMHXSCP-UHFFFAOYSA-H 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002551 biofuel Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 125000005456 glyceride group Chemical group 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 150000003904 phospholipids Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 239000012264 purified product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical group [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-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
- C10G67/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only
- C10G67/02—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural serial stages only
- C10G67/14—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one process for refining in the absence of hydrogen only plural serial stages only including at least two different refining steps in the absence of hydrogen
-
- 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
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1003—Waste materials
- C10G2300/1007—Used oils
-
- 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
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/202—Heteroatoms content, i.e. S, N, O, P
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Catalysts (AREA)
Abstract
The invention relates to the technical field of biological oil products, and discloses a waste grease hydrogenation pretreatment purification method, which comprises the following steps: the waste grease, the hydrogen and the hydrogenation pretreatment catalyst which are subjected to mechanical impurity removal through a filter are fully mixed, and then enter a slurry bed hydrogenation reactor for hydrogenation; separating the hydrogenated effluent by a hydrocyclone to obtain solid tailings and liquid products, and separating the liquid products into gas and liquid in a high-pressure separator and a low-pressure separator; the hydrogen-rich gas is recycled after being adsorbed; the liquid product enters a solid-liquid separation unit, and the separated liquid product is a product after hydrogenation pretreatment and purification. According to the invention, the slurry bed hydrogenation pretreatment process is adopted, so that the hydrogenation conversion of non-ideal components such as oxygen-containing compounds in waste grease can be efficiently completed; the adaptability of raw materials is strong; the liquid product has high yield and good quality; the hydrogenation pretreatment catalyst has long cycle service life; the operating cycle of the waste grease hydrotreater can be remarkably prolonged.
Description
Technical Field
The invention relates to the technical field of biological oil products, in particular to a waste grease hydrogenation pretreatment purification method.
Background
The aviation kerosene has proper density, high heat value, good combustion performance, small combustion area, less carbon deposition and difficult coking, and can be rapidly, stably, continuously and completely combusted; the low-temperature fluidity is good, and the requirements of cold low-temperature areas and high-altitude flight on the fluidity of oil products can be met; the heat stability and the oxidation stability are good, and the requirements of supersonic high-altitude flight can be met; high cleanliness, no harmful substances such as mechanical impurities, moisture and the like, low sulfur content, particularly mercaptan sulfur content, and small corrosion to parts.
Compared with the traditional fossil fuel, the biological aviation kerosene produced by taking the vegetable oil represented by the palm oil and the waste grease represented by the swill-cooked dirty oil as raw materials can reduce the carbon emission by 55-92%, and the occupation ratio of the biological aviation kerosene in the aviation fuel is promoted.
The biodiesel is prepared from waste grease, which belongs to the regeneration of waste energy.
Because of the high viscosity, high oxygen content, unstable combustion, low heat value and other characteristics of the biomass raw material, hydrodeoxygenation treatment is required before use, and the main types of oxygen-containing compounds in the biomass raw material comprise phenols, furans, ketones, aldehydes, esters and the like. The main oxygen-containing compound in palm oil and swill-cooked dirty oil is triglyceride, and most of carbon chains have length of C 14～22 Wherein C 18 And C 16 Accounting for more than 95 percent of the total fatty acid.
The existing production process of the second generation biodiesel mainly adopts a fixed bed hydrogenation process, and mainly uses waste grease as a raw material to prepare the biological aviation kerosene, wherein the waste grease raw material has the defects of high acid value and excessively high content of Fe, na, ca metal elements, O, N, P and other elements, and the waste grease raw material is easy to deposit on an active component of a hydrogenation catalyst in the hydrogenation reaction process to quickly poison the catalyst; in addition, the presence of long-chain olefins and oxygenates can cause agglomeration and plugging of the catalyst bed, causing rapid rise in reactor pressure drop and shut down; in addition, due to different sources and complex composition of biomass raw materials, the problems of device blockage, corrosion and the like commonly exist in the conventional fixed bed hydrogenation process, and high requirements are put on the continuity and long-period stable operation of the hydrodeoxygenation process, wherein the long-period stable operation of the hydrodeoxygenation process is the pain point of the biological aviation kerosene production technology.
The carrier of the supported catalyst has a direct influence on the service life and stability of the catalyst. Currently, the most used support for Hydrodeoxygenation (HDO) catalysts is γ -Al 2 O 3 . However, the high oxygen content of the bio-oil feedstock can cause a certain amount of water to be generated during hydrodeoxygenation, and Al in water vapor at a certain pressure 2 O 3 Boehmite is generated, so that the catalyst structure collapses, the specific surface area and the pore volume are reduced, the mechanical strength is reduced, and the catalytic activity of the catalyst is reduced. Conventional supported catalysts have great limitations in the hydroprocessing of waste oils and fats.
The patent application number CN20110373951. X discloses a method for producing biodiesel, which uses kitchen waste oil and mineral diesel oil as raw materials, and the addition of the mineral diesel oil solves the problem of H generated in hydrodeoxygenation to a certain extent 2 The influence of O on the service life of the catalyst, but the addition of the mineral diesel oil ensures that the produced finished biodiesel does not accord with the national definition of biodiesel, cannot enjoy corresponding tax preference, and loses economic benefit.
The patent with the application number of CN202110261877.6 discloses a process for directly producing aviation kerosene by utilizing waste grease, which comprises the processes of pretreatment of raw oil, hydrolysis of high-carbon-number hydrocarbons to obtain fatty acid, hydrofining and the like, and has complex operation process, and the operation of obtaining fatty acid through hydrolysis increases construction cost and running cost.
The patent with the application number of CN200610083300.6 discloses a method for preparing biodiesel, which comprises the steps of carrying out transesterification reaction on a biological grease raw material and short-chain alcohol, recovering methanol and glycerin, wherein the product prepared by the method is first-generation biodiesel, and has the defects of high energy consumption and difficult recovery of methyl ester products, and the catalyst used in the transesterification process is a Bronsted acid ionic liquid catalyst, so that the production cost is high.
The patent with the application number of CN201110192761.8 discloses a method for preparing biodiesel by hydrogenation, which uses excellent vegetable oil as a raw material, mainly comprises the processes of hydrofining, hydrodewaxing and the like, uses a catalyst in a sulfurized state, needs to presulfiding an oxidized catalyst active component by using a sulfur-containing compound (such as carbon disulfide, thioether, derivative thereof and the like), has a complex operation process and serious pollution to water. The catalyst carrier is gamma-Al 2 O 3 The catalyst structure can collapse under the long-term hydrothermal condition, the specific surface area and the pore volume are reduced, and the mechanical strength is reduced.
Patent application number CN201910190312.6 discloses a method for preparing biodiesel, which comprises the steps of hydrolysis of glyceride, water phase reforming of glycerol to generate hydrogen, hydrofining and the like. The method does not need to additionally introduce high-purity nitrogen, and has low energy consumption. However, the subsequent hydrogenation reaction at too high a temperature can inhibit the aqueous phase reforming reaction of glycerol from generating hydrogen, and the product separation is complex.
The patent with application number CN201911163276.6 discloses a method for preparing hydrogenated biodiesel by catalyzing grease to directionally hydrodeoxygenation, which uses waste grease and the like as raw materials, wherein the used catalyst is a molecular sieve supported catalyst which is Ni 2 P/SAPO-11, the existence of phosphide can cause a large amount of phosphating wastewater, the treatment cost is high, and the generated wastewater has serious pollution to the environment.
The patent with application number CN201510263141.7 discloses a method for producing aviation biofuel from waste animal and vegetable oil, which consists of a pretreatment unit, a hydrotreatment unit, a degassing and dehydration unit, a hydroconversion unit and a rectification unit, has complex treatment procedures, and needs to fill a protective agent in the hydrotreatment unit and also needs to adopt a special catalyst grading process to prevent H generated in the grease hydrogenation process 2 Influence of O on the catalyst activity. The operation flexibility is low.
In summary, in the process of producing biological aviation kerosene by using waste grease, the method generally encountersTo the following problems: on the one hand, the composition of the waste grease is complex, the waste grease raw material has the defects of high acid value and excessively high contents of Fe, na, ca metal elements, O, N, P and other elements, the fixed bed catalyst is easy to poison and deactivate, the coking and blocking are difficult to realize long-period operation, and the fixed bed hydrodeoxygenation industrialization is hindered. On the other hand, the carrier of the supported catalyst has a direct influence on the service life and stability of the catalyst. However, the high oxygen content of the bio-oil feedstock can cause a certain amount of water to be generated during hydrodeoxygenation, and Al in water vapor at a certain pressure 2 O 3 Boehmite is generated, so that the catalyst structure collapses, the specific surface area and the pore volume are reduced, the mechanical strength is reduced, and the catalytic activity of the catalyst is reduced. Conventional supported catalysts have great limitations in the hydroprocessing of waste oils and fats. Therefore, eliminating various defects of a fixed bed in the hydrodeoxygenation process, developing a treatment process with strong adaptability to raw materials and capable of realizing large-scale and long-period operation of a device is an important problem to be solved in the field.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a waste grease hydrogenation pretreatment purification method, which has the following technical scheme:
a method for purifying waste grease by hydrogenation pretreatment comprises the following steps:
s101: the waste grease, the hydrogen and the hydrogenation pretreatment catalyst which are subjected to mechanical impurity removal through a filter are fully mixed, and then enter a slurry bed hydrogenation reactor for hydrogenation pretreatment;
s102: separating the hydrogenated effluent by a hydrocyclone to obtain solid-containing tailings and a liquid product;
s103: the liquid product obtained by the separation of the hydrocyclone enters a high-pressure separator and a low-pressure separator for gas-liquid separation;
s104: the hydrogen-rich gas obtained by separation of the high-pressure separator enters an adsorption tower, hydrogen sulfide in the gas is removed, and the gas enters a circulating hydrogen compressor for recycling;
s105: the liquid product obtained by the separation of the low-pressure separator enters a solid-liquid separation unit, the separated liquid product is a product after hydrogenation pretreatment and purification, and the solid residue is discharged out of the device.
Further, the waste grease, hydrogen and the hydrogenation pretreatment catalyst in the step S101 are mixed and then enter a slurry bed hydrogenation reactor from the bottom to flow from bottom to top; the reaction conditions of the slurry bed hydrogenation reactor are as follows: the hydrogen partial pressure in the reactor is 4-20 MPa, the reaction temperature is 340-410 ℃, and the liquid hourly space velocity is 0.5-1.5 h -1 The volume ratio of the hydrogen to the waste grease is 300-1200 Nm 3 /m 3 The method comprises the steps of carrying out a first treatment on the surface of the The axial temperature distribution of the slurry bed hydrogenation reactor is uniform, and the maximum temperature difference is not more than 15 ℃.
Further, the adding amount of the hydrogenation pretreatment catalyst in the S101 accounts for 0.005-0.2% of the weight of the waste grease.
Further, the operating conditions of the hydrocyclone in S102 are as follows: the pressure is 4-20 MPa, and the temperature is 200-300 ℃; the hydrocyclone in S102 comprises a first-stage hydrocyclone and a second-stage hydrocyclone which are sequentially connected, solid-containing tail liquid obtained by the first-stage hydrocyclone enters the second-stage hydrocyclone, a part of tail slag obtained by the second-stage hydrocyclone is recycled to an inlet of the slurry bed hydrogenation reactor, a small amount of tail slag is discharged outwards, wherein the amount of the tail slag recycled to the inlet of the slurry bed hydrogenation reactor accounts for 80-99 wt% of the total amount of the tail slag, and the discharge amount of the tail slag accounts for 1-20 wt% of the total amount of the tail slag.
Further, the hydrogenation pretreatment catalyst in S101 is composed of group VIB metal Mo or W and group VIIIB metal Co or Ni which are loaded on a carrier, and the catalyst active components are 10% -30% by weight of oxide.
Further, the hydrotreating catalyst in S101 is: 1 to 6 weight percent of nickel oxide and/or cobalt oxide, 6 to 24 weight percent of molybdenum oxide and/or tungsten oxide, and the balance of carbon carrier.
Further, the preparation steps of the hydrogenation pretreatment catalyst in S101 are as follows:
(1) Preparing a solution with a required concentration from soluble salt of active metal, impregnating a carbon carrier by adopting an isovolumetric impregnation method, and drying for 1-10 hours at 80-200 ℃ to obtain a carbon-supported metal catalyst; the active metal soluble salts comprise nickel salts, cobalt salts, molybdenum salts and tungsten salts, wherein the nickel salts comprise nickel nitrate and basic nickel carbonate, the cobalt salts comprise cobalt nitrate, cobalt acetate and basic cobalt carbonate, the molybdenum salts comprise molybdenum oxide and ammonium molybdate, and the tungsten salts comprise tungsten oxide and ammonium metatungstate;
(2) Adding the active carbon supported metal catalyst obtained in the step (1) and a vulcanizing agent into a reaction kettle for hydrothermal treatment, wherein the molar ratio of the sulfur content of the vulcanizing agent to the active metal content is 3-5:1, the active metal content is the sum of nickel and/or cobalt and molybdenum and/or tungsten, the reaction temperature is 80-200 ℃, and the reaction time is 2-6 hours, so that the carbon supported transition metal sulfide catalyst can be obtained.
Further, the hydrogenation pretreatment catalyst is granular and has an outer diameter of 50-500 mu m.
Further, the vulcanizing agent is one or more of ammonium sulfide, ammonium polysulfide, elemental sulfur, thiourea and ammonium thiosulfate.
Further, the waste grease comprises one or more of acidized oil, swill-cooked dirty oil, animal internal dirty oil, condensate oil of a smoke exhaust ventilator, clay refining desorption oil, fatlute generated in the oil pressing process, beef and mutton skin oil, palmitoized oil, coconut oil and palm oil.
Compared with the prior art, the invention has the following beneficial technical effects:
1. by adopting the slurry bed hydrogenation pretreatment process, the hydrodeoxygenation of the waste grease and the deep removal of chlorine, metal, phospholipid and other hetero atoms can be efficiently realized, and the hydroconversion of non-ideal components such as oxygen-containing compounds in the waste grease can be completed. Wherein the deoxidization rate of the waste grease after the slurry bed hydrogenation pretreatment is higher than 99 percent.
2. The process flow is simple.
3. The operation is flexible.
4. The adaptability of raw materials is strong.
5. The liquid product has high yield and good quality.
6. The hydrogenation pretreatment catalyst has long cycle service life.
7. The operating cycle of the waste grease hydrotreater can be remarkably prolonged.
8. Provides pretreatment technical support for the high added value utilization of waste grease, and has very broad application prospect.
Drawings
FIG. 1 is a flow chart of a waste grease hydrogenation pretreatment process according to the invention;
in the figure: 1-waste grease, 2-filter, 3-hydrogen, 4-hydrogenation pretreatment catalyst, 5-recycle hydrogen, 6-slurry bed hydrogenation reactor, 7-hydrogenation pretreatment reaction product, 8-first-stage hydrocyclone, 9-first-stage hydrocyclone liquid material, 10-first-stage hydrocyclone containing solid tailings, 11-second-stage hydrocyclone, 12-second-stage hydrocyclone liquid material, 13-second-stage hydrocyclone slag, 14-high pressure separator, 15-hydrogen-rich gas, 16-adsorption tower, 17-recycle hydrogen compressor, 18-high pressure separator liquid product, 19-low pressure separator, 20-fuel gas, 21-low pressure separator liquid product, 22-solid-liquid separation unit, 23-hydrogenation pretreatment purified product, 24-solid residue, 25-recycle tailings, 26-externally discharged tailings.
Detailed Description
The method for purifying the waste grease by the hydrogenation pretreatment is further described below with reference to the accompanying drawings. Many devices such as pumps, heat exchangers, compressors, etc. are omitted from the figures, but are well known to those of ordinary skill in the art.
As shown in the attached figure 1, the detailed flow of the waste grease hydrogenation pretreatment purification method is described as follows:
the waste grease 1 from the pipeline is thoroughly mixed with hydrogen 3 and a hydrogenation pretreatment catalyst 4 after mechanical impurities are removed by a filter 2, and then enters a slurry bed hydrogenation reactor 6 for hydrogenation pretreatment; the hydrogen partial pressure in the slurry bed hydrogenation reactor 6 is 4-20 MPa, the reaction temperature is 340-410 ℃, and the liquid hourly space velocity is 0.5-1.5 h -1 The volume ratio of hydrogen to raw materials is 300-1200 Nm 3 /m 3 The method comprises the steps of carrying out a first treatment on the surface of the Realizing the high-efficiency removal of O, N, P, S, fe, ca and other elements in the waste grease; the hydrogenation pretreatment reaction product 7 enters a first-stage hydrocyclone 8 for solid-liquid separation, and is separated by a second-stage hydrocyclone 11 to obtain a second-stage hydrocycloneSlag 13: part of the waste residues are recycled as recycled tailings 25 to enter the slurry bed hydrogenation reactor 6, and the rest of the waste residues are discharged as discharged tailings 26; the operating conditions of the primary hydrocyclone 8 and the secondary hydrocyclone 11 are: the pressure is 4-20 MPa, and the temperature is 200-300 ℃; the liquid product obtained by the separation of the secondary hydrocyclone 11 enters a high-pressure separator 14 for gas-liquid separation; the hydrogen-rich gas 15 separated by the high-pressure separator 14 enters an adsorption tower 16 to adsorb and remove hydrogen sulfide, and then is circulated back to the reactor through a circulating hydrogen compressor 17; the liquid phase product separated by the low pressure separator 19 enters a solid-liquid separation unit 22 for solid-liquid separation, and the separated solid residue 24 is discharged out of the device, and finally the product 23 after hydrogenation pretreatment and purification is obtained.
The following examples further illustrate the method for purifying waste oils and fats by hydrogenation pretreatment, but are not intended to limit the invention.
The properties of the raw materials used in the examples are shown in Table 1.
TABLE 1 main Properties of waste fat Material
。
Example 1
The preparation method of the hydrogenation pretreatment catalyst in the waste grease hydrogenation pretreatment purification method comprises the following steps: 28.8g of ammonium molybdate tetrahydrate is weighed and dispersed in 120ml of deionized water to obtain a clear solution A; 13.4g of nickel nitrate hexahydrate is weighed and dissolved in 30ml of ammonia water to obtain a clear solution B; mixing the clarified solution A and the clarified solution B to prepare an impregnating solution C; 100g of the carbon support is placed in an impregnating solution C by an isovolumetric impregnation method, and is dried for 120 minutes at 120 ℃ after 60 minutes of impregnation; and (3) adding the dried catalyst into a reaction kettle, performing hydrothermal treatment on thiourea solution, wherein the molar ratio of the sulfur content of thiourea to the active metal content (sum of nickel and molybdenum) is 4:1, the reaction temperature is 160 ℃, and the reaction time is 120 minutes, so that the active carbon-loaded NiMo sulfidic catalyst can be obtained. Catalyst in MoO 3 Calculating metal loading amount by mass fraction of NiO, wherein: moO (MoO) 3 22.0. 22.0 wt% and 3.0% by weight of NiO. Catalyst particle size 100 μm. The reaction conditions of the slurry bed hydrogenation reactor are shown in Table 2, and the reaction results of the slurry bed hydrogenation reactor are shown in Table 3.
Example 2
The preparation method of the hydrogenation pretreatment catalyst in the waste grease hydrogenation pretreatment purification method comprises the following steps: 30.5g of ammonium tungstate hexahydrate is weighed and dispersed in 120ml of deionized water to obtain a clear solution A; 13.6g of nickel nitrate hexahydrate is weighed and dissolved in 30ml of ammonia water to obtain a clear solution B; mixing the clarified solution A and the clarified solution B to prepare an impregnating solution C; 10g of acid-treated active carbon material is placed in an impregnating solution C by an isovolumetric impregnation method, the impregnating solution C is impregnated for 180 minutes and then dried for 180 minutes at 130 ℃, the dried catalyst is added into a reaction kettle, the hydrothermal treatment is carried out on thiourea solution, the molar ratio of sulfur content to active metal content (sum of nickel and tungsten) of thiourea is 4:1, the reaction temperature is 160 ℃, and the reaction time is 120 minutes, so that the active carbon-loaded NiW vulcanized catalyst can be obtained. The catalyst is WO 3 Calculating metal loading amount by mass fraction of NiO, wherein: WO (WO) 3 22.0. 22.0 wt% and 3.0% by weight of NiO. The catalyst particle size was 100. Mu.m. The reaction conditions of the slurry bed hydrogenation reactor are shown in Table 2, and the reaction results of the slurry bed hydrogenation reactor are shown in Table 3.
TABLE 2 reaction conditions for waste oil slurry bed hydrogenation pretreatment
。
TABLE 3 results of waste oil slurry bed hydrogenation pretreatment reactions
。
As shown in Table 3, the waste grease is treated according to the slurry bed hydrogenation process adopted by the method of the invention, the oxygen content of the hydrotreatment product obtained by the industrial waste diesel hydrofining catalyst adopted in the example 3 is 1.52%, the oxygen content of the hydrotreatment products of the catalysts adopted in the other examples is less than 1%, and the deoxidization rate is more than 90%, wherein the deoxidization rates of the oil-soluble molybdenum-based catalyst and the carbon-supported NiMo catalyst are more than 99%, so that the high-efficiency conversion of non-ideal components in the waste grease is realized, and the requirement of the subsequent further hydrotreatment on raw materials is met.
It will be apparent to those skilled in the art that the present invention has been described in detail by way of illustration only, and it is not intended to be limited by the above-described embodiments, as long as various insubstantial modifications of the method concepts and aspects of the invention are employed or the inventive concepts and aspects of the invention are directly applied to other applications without modification, all within the scope of the invention.
Claims (10)
1. The waste grease hydrogenation pretreatment purification method is characterized by comprising the following steps:
s101: the waste grease, the hydrogen and the hydrogenation pretreatment catalyst which are subjected to mechanical impurity removal through a filter are fully mixed, and then enter a slurry bed hydrogenation reactor for hydrogenation pretreatment;
s102: separating the hydrogenated effluent by a hydrocyclone to obtain solid-containing tailings and a liquid product;
s103: the liquid product obtained by the separation of the hydrocyclone enters a high-pressure separator and a low-pressure separator for gas-liquid separation;
s104: the hydrogen-rich gas obtained by separation of the high-pressure separator enters an adsorption tower, hydrogen sulfide in the gas is removed, and the gas enters a circulating hydrogen compressor for recycling;
s105: the liquid product obtained by the separation of the low-pressure separator enters a solid-liquid separation unit, the separated liquid product is a product after hydrogenation pretreatment and purification, and the solid residue is discharged out of the device.
2. The method for purifying waste grease by hydrogenation pretreatment according to claim 1, wherein the waste grease, hydrogen and a hydrogenation pretreatment catalyst in S101 are mixed and then enter a slurry bed hydrogenation reactor from the bottom to flow from bottom to top; the reaction conditions of the slurry bed hydrogenation reactor are as follows: the hydrogen partial pressure in the reactor is 4-20 MPa, the reaction temperature is 340-410 ℃, and the liquid time volume is emptyThe speed is 0.5 to 1.5 hours -1 The volume ratio of the hydrogen to the waste grease is 300-1200 Nm 3 /m 3 The method comprises the steps of carrying out a first treatment on the surface of the The axial temperature distribution of the slurry bed hydrogenation reactor is uniform, and the maximum temperature difference is not more than 15 ℃.
3. The method for purifying waste oil by hydrogenation pretreatment according to claim 1, wherein the amount of the hydrogenation pretreatment catalyst added in S101 is 0.005-0.2% by weight of the waste oil.
4. The method for purifying waste grease by hydrogenation pretreatment according to claim 1, wherein the operation conditions of the hydrocyclone in S102 are as follows: the pressure is 4-20 MPa, and the temperature is 200-300 ℃; the hydrocyclone in S102 comprises a first-stage hydrocyclone and a second-stage hydrocyclone which are sequentially connected, solid-containing tail liquid obtained by the first-stage hydrocyclone enters the second-stage hydrocyclone, a part of tail slag obtained by the second-stage hydrocyclone is recycled to an inlet of the slurry bed hydrogenation reactor, a small amount of tail slag is discharged outwards, wherein the amount of the tail slag recycled to the inlet of the slurry bed hydrogenation reactor accounts for 80-99 wt% of the total amount of the tail slag, and the discharge amount of the tail slag accounts for 1-20 wt% of the total amount of the tail slag.
5. The method for the hydrotreatment and purification of waste grease according to claim 1, wherein the hydrotreatment catalyst in S101 is a group VIB metal Mo or W and a group VIIIB metal Co or Ni which are supported on a carrier, and the catalyst active components are 10% -30% by weight of oxide.
6. The method for purifying waste grease by hydrogenation pretreatment according to claim 1, wherein the hydrogenation pretreatment catalyst in S101 is: 1 to 6 weight percent of nickel oxide and/or cobalt oxide, 6 to 24 weight percent of molybdenum oxide and/or tungsten oxide, and the balance of carbon carrier.
7. The method for purifying waste grease by hydrogenation pretreatment according to claim 1, wherein the preparation step of the hydrogenation pretreatment catalyst in S101 is as follows:
(1) Preparing a solution with a required concentration from soluble salt of active metal, impregnating a carbon carrier by adopting an isovolumetric impregnation method, and drying for 1-10 hours at 80-200 ℃ to obtain a carbon-supported metal catalyst; the active metal soluble salts comprise nickel salts, cobalt salts, molybdenum salts and tungsten salts, wherein the nickel salts comprise nickel nitrate and basic nickel carbonate, the cobalt salts comprise cobalt nitrate, cobalt acetate and basic cobalt carbonate, the molybdenum salts comprise molybdenum oxide and ammonium molybdate, and the tungsten salts comprise tungsten oxide and ammonium metatungstate;
(2) Adding the active carbon supported metal catalyst obtained in the step (1) and a vulcanizing agent into a reaction kettle for hydrothermal treatment, wherein the molar ratio of the sulfur content of the vulcanizing agent to the active metal content is 3-5:1, the active metal content is the sum of nickel and/or cobalt and molybdenum and/or tungsten, the reaction temperature is 80-200 ℃, and the reaction time is 2-6 hours, so that the carbon supported transition metal sulfide catalyst can be obtained.
8. The method for purifying waste oil and fat by hydrogenation pretreatment according to claim 7, wherein the hydrogenation pretreatment catalyst is in the form of particles with an outer diameter of 50-500 μm.
9. The method for the pretreatment and purification of the waste grease by hydrogenation according to claim 7, wherein the vulcanizing agent is one or more of ammonium sulfide, ammonium polysulfide, elemental sulfur, thiourea and ammonium thiosulfate.
10. The method for the hydrotreatment and purification of waste grease according to claim 1, wherein the waste grease comprises one or more of acidified oil, swill-cooked dirty oil, animal internal dirty oil, condensate oil of a range hood, clay refining desorption oil, fatlute generated in the oil extraction process, beef and mutton skin oil, palmitoylated oil, coconut oil and palm oil.
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