EP1558701B1 - Fischer-tropsch process using a fischer-tropsch catalyst and a zeolite-containing catalyst - Google Patents
Fischer-tropsch process using a fischer-tropsch catalyst and a zeolite-containing catalyst Download PDFInfo
- Publication number
- EP1558701B1 EP1558701B1 EP03810426A EP03810426A EP1558701B1 EP 1558701 B1 EP1558701 B1 EP 1558701B1 EP 03810426 A EP03810426 A EP 03810426A EP 03810426 A EP03810426 A EP 03810426A EP 1558701 B1 EP1558701 B1 EP 1558701B1
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- EP
- European Patent Office
- Prior art keywords
- catalyst particles
- fischer
- tropsch
- catalytic cracking
- fluid catalytic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000003054 catalyst Substances 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008569 process Effects 0.000 title claims abstract description 39
- 229910021536 Zeolite Inorganic materials 0.000 title claims description 8
- 239000010457 zeolite Substances 0.000 title claims description 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 title claims description 7
- 238000004231 fluid catalytic cracking Methods 0.000 claims abstract description 69
- 239000002245 particle Substances 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 16
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 150000002736 metal compounds Chemical class 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000011541 reaction mixture Substances 0.000 claims 1
- 239000000047 product Substances 0.000 description 17
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 16
- 229910052761 rare earth metal Inorganic materials 0.000 description 11
- 150000002910 rare earth metals Chemical class 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 150000001336 alkenes Chemical class 0.000 description 7
- 238000006317 isomerization reaction Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 3
- 239000003426 co-catalyst Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000003502 gasoline Substances 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000001694 spray drying Methods 0.000 description 3
- -1 steam Chemical compound 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000006069 physical mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000002909 rare earth metal compounds Chemical class 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- C10G2/00—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
- C10G2/30—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen
- C10G2/32—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen with the use of catalysts
- C10G2/33—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen with the use of catalysts characterised by the catalyst used
- C10G2/331—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen with the use of catalysts characterised by the catalyst used containing group VIII-metals
Definitions
- the present invention relates to a Fischer-Tropsch process for the conversion of carbon monoxide and hydrogen to C 5 + hydrocabon mixtures using a Fischer-Tropsch catalyst and a zeolite-containing catalyst.
- the Fischer-Tropsch process generally comprises the following process steps.
- the first step involves reacting a source of carbon (such as coal or natural gas) with a source of oxygen (such as steam, air or oxygen) to form a mixture of carbon monoxide and hydrogen, usually referred to as synthesis gas.
- the second step involves contacting the carbon monoxide and hydrogen with a Fischer-Tropsch catalyst leading to hydrocarbons and water.
- the main products of the Fischer-Tropsch reaction are linear olefins and paraffins and water, but limited isomerisation and inclusion of heteroatoms such as oxygen may occur.
- Generally applied catalysts for this second step are iron and/or cobalt-containing catalysts.
- the third step involves isomerisation of the hydrocarbons formed in the second step to produce more valuable products.
- the longer chains in the product may be cracked to form products in the diesel or gasoline range, and linear paraffins may be isomerized to improve diesel product properties like cloud point and pour point.
- adapted hydrotreating catalysts are used for this third step.
- US 5,928,980 discloses the use - in the second step of the Fischer-Tropsch process - of a spent fluid catalytic cracking (FCC) catalyst impregnated with a group VIII metal, preferably cobalt and/or iron.
- This catalyst composition is prepared by impregnating the spent FCC catalyst with a metal salt, calcining the impregnated FCC catalyst to obtain a supported metal oxide, and reducing the metal oxide to the metal in a reducing gas atmosphere.
- the impregnated metal serves as the Fischer-Tropsch catalyst.
- This prior art catalyst composition requires a cumbersome process - involving the steps of impregnation, calcination, and reduction. It is therefore an object of the present invention to provide a process for the conversion of carbon monoxide and hydrogen to C 5 + hydrocabon mixtures using a system of a Fischer-Tropsch catalyst and an FCC catalyst, which system is easier to prepare.
- a second object is to provide a process using a catalyst system which can be used more flexibly according to need.
- a third object is to provide an Inexpensive catalyst system.
- US-A-4 906 671 describes a process for producing diesel from hydrogen and carbonoxides using a catalyst system comprising a FCC catalyst and a FT catalyst.
- example 6 discusses a process in which a Fischer-Tropsch type synthesis is utilized as an exothermic addition reaction, the heat derived therefrom serving to effect an endothermic dehydration reaction. There is discussion of a dehydration of isobutanol to isobutylene catalysed by a synthetic Y-zeolite. The reactions are carried out at atmospheric pressure.
- the process according to the invention uses Fischer-Tropsch catalyst particles and fluid catalytic cracking catalyst particles.
- the catalyst composition according to the present invention can be prepared by simply mixing existing Fischer Tropsch catalyst particles and FCC catalyst particles. Its preparation does not require industrially undesired impregnation steps.
- the Fischer-Tropsch catalyst particles and the FCC catalyst particles may be used in the form of shaped bodies in which both particles are embedded.
- shaped bodies are spray-dried particles (microspheres), extrudates, pellets, spheres, etc.
- Such shaped bodies can be prepared by shaping a physical mixture of Fischer-Tropsch catalyst particles and FCC catalyst particles. Suitable methods to obtain such shaped bodies include spray-drying, pelletising, extrusion (optionally combined with kneading), beading, or any other conventional shaping method used in the catalyst and absorbent fields or combinations thereof. For instance, if the preparation of the Fischer-Tropsch catalyst particles involves a spray-drying step, it is possible to add the FCC catalyst to the Fischer-Tropsch catalyst before spray-drying and subsequently spray-dry the resulting mixture.
- a matrix or binding material can be added to improve the mechanical strength of the shaped bodies.
- suitable matrix or binding materials are alumina, silica, clays, and mixtures thereof. Matrix or binding materials comprising alumina are generally preferred.
- the matrix or binding material, if present, is preferably present in an amount of 10-40 wt%, more preferably 15-35 wt%, and most preferably 25-35 wt%, based on the total weight of the catalyst composition.
- the term 'FCC catalyst' includes fresh FCC catalysts, spent FCC catalysts and equilibrium catalysts (E-cat).
- a spent FCC catalyst is less expensive than a fresh FCC catalyst. Furthermore, its use results in re-use of waste materials, which is economically and environmentally favourable.
- the Fischer-Tropsch catalyst particles and the Fischer-Tropsch catalyst particles are not in the form of shaped bodies in which both particles are embedded, the Fischer-Tropsch catalyst particles and the FCC catalyst particles can be dosed individually - according to need - to the Fischer-Tropsch unit. This creates great flexibility. For instance, if the process conditions change during processing or if one of the catalysts deactivates faster than the other, one of the catalysts might be added with a faster dosing rate than the other.
- the quality of E-cat or spent FCC catalyst will vary from batch to batch. This difference can be compensated for by adapting the dosing rate of the FCC catalyst particles compared to that of the Fischer-Tropsch catalyst particles.
- zeolite Y-containing FCC catalysts are used.
- Such FCC catalysts generally contain zeolite Y, clay (e.g. kaolin, metakaolin, bentonite), silica, alumina, rare-earth metal compounds, etc.
- suitable metals are rare earth metals, e.g. Ce, La, and transition metals of Groups IV-VIII of the Periodic System, e.g. V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Ru, Re, etc.
- the metal compounds can serve to, e.g., increase the particle strength (e.g. La compounds), enhance the catalyst's stability (e.g. Ni compounds), or enhance CO conversion (e.g.
- This metal compound is preferably present in or on the FCC catalyst particles in amounts of 0.1 to 10 wt%, more preferably 0.3 to 2 wt%, calculated as oxide, and based on the total weight of metal-containing FCC catalyst.
- the metal compound can be deposited on the FCC catalyst particles in any manner known in the art. Examples of such methods are impregnation, ionexchange, and deposition precipitation of soluble metal salts. If desired, the metal-deposited FCC catalyst particles is calcined and/or prereduced after the metal compound has been deposited.
- An additional advantage of using a spent FCC catalyst compared to a fresh FCC catalyst is that a spent FCC catalyst will generally contain a desired metal compound, due to the fact that the hydrocarbon feed to be cracked in an FCC unit generally contains various metals - e.g. nickel, vanadium. Consequently, no additional deposition step is required to introduce such a metal compound.
- the Fischer-Tropsch catalyst can be any conventional Fischer-Tropsch catalyst, preferably comprising iron and/or cobalt. For the preparation of such catalysts it is referred to, e.g., WO 01/97968 , WO 01/89686 / and WO 01/70394 .
- the Fischer-Tropsch catalyst can be promoted with various metals, e.g. Al, Ti, Cr, Mn, Ca, Na and/or K.
- the Fischer-Tropsch catalyst particles can contain binder materials, such as silica and/or alumina.
- Both the FCC catalyst particles and the Fischer-Tropsch catalyst particles can be used in the second step of the Fischer-Tropsch process, either in the form of separate particles, or in the form of shaped bodies in which both particles are embedded.
- the FCC catalyst particles are preferably be used in an amount of 5 to 40 wt%, more preferably from 10 to 30 wt%.
- the second step can be carried out in any suitable reactor, such as a (fixed) fluldised bed reactor.
- the temperature ranges preferably from 250° to 400°C, more preferably from 300° to 370°C, and most preferably from 330° to 350°C.
- the pressure ranges from 10 to 60 bar, more preferably 15 to 30 bar, and most preferably about 20 bar.
- the H 2 /CO volume ratio preferably ranges from 0.2 to 6.0, preferably 0.5-6, most preferably 1-3.
- the third step is generally conducted at temperatures of 150 to 600°C, more preferably 200 to 500°C, and most preferably 300 to 400°C
- the pressure preferably ranges from 5 to 60 bar, more preferably from 15 to 40 bar, and most preferably from 20 to 30 bar.
- the resulting hydrocarbon product preferably contains, on a mass basis, at least 35%, more preferably at least 45%, and most preferably at least 50% of C 5 + compounds.
- the process may be used for the production of branched hydrocarbons, olefins, and/or aromatics.
- the process is used for the production of liquid fuel, especially diesel and gasoline, and preferably unleaded gasoline.
- the FCC catalysts were reduced in situ in the reactor under 20 bar hydrogen pressure 340°C for 1 hr. After the reduction procedure was completed, the nitrogen flow was introduced and subsequently 1-hexene was dosed (0.11 ml/min). The composition of the reaction product was followed by on-line GC analysis.
- FCC catalysts Three different types were tested according to this procedure: a fresh FCC catalyst containing a low amount of rare earth (RE), a fresh FCC catalyst containing a high amount of rare earth metals, and an equilibrium FCC catalyst (E-cat) resulting from the FCC catalyst with a low amount of RE.
- RE rare earth
- E-cat equilibrium FCC catalyst
- n - C 6 refers to normal C 6 paraffins
- i - C 6 refers to branched C 6 paraffins
- n - C 6 refers to normal C 6 olefins
- i - C 6 refers to branched C 6 olefins
- ⁇ C 6 and >C 6 refers to compounds with less and more than 6 carbon atoms, respectively.
- the total amounts of isomerized products at 0.5 hr and 17.5 hr runtime were 52.0 wt% and 60.1 wt%, respectively.
- This high isomerization selectivity was accompanied with a low level of cracking; only 3.4 wt% of products smaller than C 6 ( ⁇ C 6 ) were obtained at 17.5 hr runtime.
- the amount of aromatic products was far below 1 wt% during the whole run.
- the total amounts of isomerized products at 0.5 hr and 17.5 hr runtime were 44.8 wt% and 60.5 wt%, respectively.
- the level of cracking was 5.3 wt% at 17.5 hr runtime.
- the amount of aromatic products was far below 1 wt% during the whole run.
- the total amounts of isomerized products at 0.5 hr and 17.5 hr runtime were 38.2 wt% and 39.8 wt%, respectively.
- the level of cracking was only 3.0 wt% at 17.5 hr runtime. Again, the amount of aromatic products was far below 1 wt% during the whole run.
- the level of isomerization of this E-cat was lower than that of the fresh FCC catalysts, it is still acceptable for use in the Fischer-Tropsch product, especially as co-catalyst in the second step..
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- 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)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Description
- The present invention relates to a Fischer-Tropsch process for the conversion of carbon monoxide and hydrogen to C5 + hydrocabon mixtures using a Fischer-Tropsch catalyst and a zeolite-containing catalyst.
- The Fischer-Tropsch process generally comprises the following process steps. The first step involves reacting a source of carbon (such as coal or natural gas) with a source of oxygen (such as steam, air or oxygen) to form a mixture of carbon monoxide and hydrogen, usually referred to as synthesis gas.
The second step involves contacting the carbon monoxide and hydrogen with a Fischer-Tropsch catalyst leading to hydrocarbons and water. Depending on the process conditions and the catalyst used, the nature of the hydrocarbons and the chain length may vary. The main products of the Fischer-Tropsch reaction are linear olefins and paraffins and water, but limited isomerisation and inclusion of heteroatoms such as oxygen may occur. Generally applied catalysts for this second step are iron and/or cobalt-containing catalysts. In order to enhance isomerisation during this second step, a co-catalyst can be added.
The third step involves isomerisation of the hydrocarbons formed in the second step to produce more valuable products. For instance, the longer chains in the product may be cracked to form products in the diesel or gasoline range, and linear paraffins may be isomerized to improve diesel product properties like cloud point and pour point. Generally, adapted hydrotreating catalysts are used for this third step. -
US 5,928,980 discloses the use - in the second step of the Fischer-Tropsch process - of a spent fluid catalytic cracking (FCC) catalyst impregnated with a group VIII metal, preferably cobalt and/or iron. This catalyst composition is prepared by impregnating the spent FCC catalyst with a metal salt, calcining the impregnated FCC catalyst to obtain a supported metal oxide, and reducing the metal oxide to the metal in a reducing gas atmosphere. The impregnated metal serves as the Fischer-Tropsch catalyst. - The preparation of this prior art catalyst composition requires a cumbersome process - involving the steps of impregnation, calcination, and reduction. It is therefore an object of the present invention to provide a process for the conversion of carbon monoxide and hydrogen to C5 + hydrocabon mixtures using a system of a Fischer-Tropsch catalyst and an FCC catalyst, which system is easier to prepare.
A second object is to provide a process using a catalyst system which can be used more flexibly according to need.
A third object is to provide an Inexpensive catalyst system. - The prior art only discloses the use of spent FCC catalyst in a Fischer-Tropsch process. It is a fourth object of the present invention to enlarge the scope of FCC catalyst to be used in Fischer-Tropsch processes by using also other types of FCC catalysts.
US-A-4 906 671 describes a process for producing diesel from hydrogen and carbonoxides using a catalyst system comprising a FCC catalyst and a FT catalyst. -
US3254023 , example 6 discusses a process in which a Fischer-Tropsch type synthesis is utilized as an exothermic addition reaction, the heat derived therefrom serving to effect an endothermic dehydration reaction. There is discussion of a dehydration of isobutanol to isobutylene catalysed by a synthetic Y-zeolite. The reactions are carried out at atmospheric pressure. - According to the invention there is provided a process as defined in claim 1.
- The process according to the invention uses Fischer-Tropsch catalyst particles and fluid catalytic cracking catalyst particles.
Hence, the catalyst composition according to the present invention can be prepared by simply mixing existing Fischer Tropsch catalyst particles and FCC catalyst particles. Its preparation does not require industrially undesired impregnation steps. - In one embodiment, the Fischer-Tropsch catalyst particles and the FCC catalyst particles may be used in the form of shaped bodies in which both particles are embedded. Examples of shaped bodies are spray-dried particles (microspheres), extrudates, pellets, spheres, etc.
- Such shaped bodies can be prepared by shaping a physical mixture of Fischer-Tropsch catalyst particles and FCC catalyst particles. Suitable methods to obtain such shaped bodies include spray-drying, pelletising, extrusion (optionally combined with kneading), beading, or any other conventional shaping method used in the catalyst and absorbent fields or combinations thereof.
For instance, if the preparation of the Fischer-Tropsch catalyst particles involves a spray-drying step, it is possible to add the FCC catalyst to the Fischer-Tropsch catalyst before spray-drying and subsequently spray-dry the resulting mixture. - If desired, a matrix or binding material can be added to improve the mechanical strength of the shaped bodies. Examples of suitable matrix or binding materials are alumina, silica, clays, and mixtures thereof. Matrix or binding materials comprising alumina are generally preferred. The matrix or binding material, if present, is preferably present in an amount of 10-40 wt%, more preferably 15-35 wt%, and most preferably 25-35 wt%, based on the total weight of the catalyst composition.
- The term 'FCC catalyst' includes fresh FCC catalysts, spent FCC catalysts and equilibrium catalysts (E-cat). A spent FCC catalyst is less expensive than a fresh FCC catalyst. Furthermore, its use results in re-use of waste materials, which is economically and environmentally favourable.
- If the FCC catalyst particles and the Fischer-Tropsch catalyst particles are not in the form of shaped bodies in which both particles are embedded, the Fischer-Tropsch catalyst particles and the FCC catalyst particles can be dosed individually - according to need - to the Fischer-Tropsch unit. This creates great flexibility. For instance, if the process conditions change during processing or if one of the catalysts deactivates faster than the other, one of the catalysts might be added with a faster dosing rate than the other.
- Furthermore, the quality of E-cat or spent FCC catalyst will vary from batch to batch. This difference can be compensated for by adapting the dosing rate of the FCC catalyst particles compared to that of the Fischer-Tropsch catalyst particles.
In addition, it is possible to either use both types of catalyst particles in the second step of the Flscher-Tropsch process, or to use the Fischer-Tropsch catalyst particles in the second step and the FCC catalyst particles in the third step. - In the process according to the invention zeolite Y-containing FCC catalysts are used. Such FCC catalysts generally contain zeolite Y, clay (e.g. kaolin, metakaolin, bentonite), silica, alumina, rare-earth metal compounds, etc.
Examples of suitable metals are rare earth metals, e.g. Ce, La, and transition metals of Groups IV-VIII of the Periodic System, e.g. V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Ru, Re, etc. The metal compounds can serve to, e.g., increase the particle strength (e.g. La compounds), enhance the catalyst's stability (e.g. Ni compounds), or enhance CO conversion (e.g. Fe, Co, or Ru compounds).
This metal compound is preferably present in or on the FCC catalyst particles in amounts of 0.1 to 10 wt%, more preferably 0.3 to 2 wt%, calculated as oxide, and based on the total weight of metal-containing FCC catalyst.
The metal compound can be deposited on the FCC catalyst particles in any manner known in the art. Examples of such methods are impregnation, ionexchange, and deposition precipitation of soluble metal salts.
If desired, the metal-deposited FCC catalyst particles is calcined and/or prereduced after the metal compound has been deposited. - An additional advantage of using a spent FCC catalyst compared to a fresh FCC catalyst is that a spent FCC catalyst will generally contain a desired metal compound, due to the fact that the hydrocarbon feed to be cracked in an FCC unit generally contains various metals - e.g. nickel, vanadium. Consequently, no additional deposition step is required to introduce such a metal compound.
- The Fischer-Tropsch catalyst can be any conventional Fischer-Tropsch catalyst, preferably comprising iron and/or cobalt. For the preparation of such catalysts it is referred to, e.g.,
WO 01/97968 WO 01/89686 WO 01/70394
The Fischer-Tropsch catalyst can be promoted with various metals, e.g. Al, Ti, Cr, Mn, Ca, Na and/or K. Furthermore, the Fischer-Tropsch catalyst particles can contain binder materials, such as silica and/or alumina. - Both the FCC catalyst particles and the Fischer-Tropsch catalyst particles can be used in the second step of the Fischer-Tropsch process, either in the form of separate particles, or in the form of shaped bodies in which both particles are embedded. Based on the total weight of FCC catalyst particles and Fischer-Tropsch catalyst particles, the FCC catalyst particles are preferably be used in an amount of 5 to 40 wt%, more preferably from 10 to 30 wt%.
- The second step can be carried out in any suitable reactor, such as a (fixed) fluldised bed reactor. The temperature ranges preferably from 250° to 400°C, more preferably from 300° to 370°C, and most preferably from 330° to 350°C.
The pressure ranges from 10 to 60 bar, more preferably 15 to 30 bar, and most preferably about 20 bar.
The H2/CO volume ratio preferably ranges from 0.2 to 6.0, preferably 0.5-6, most preferably 1-3. - The third step is generally conducted at temperatures of 150 to 600°C, more preferably 200 to 500°C, and most preferably 300 to 400°C The pressure preferably ranges from 5 to 60 bar, more preferably from 15 to 40 bar, and most preferably from 20 to 30 bar.
- The resulting hydrocarbon product preferably contains, on a mass basis, at least 35%, more preferably at least 45%, and most preferably at least 50% of C5 + compounds. The process may be used for the production of branched hydrocarbons, olefins, and/or aromatics. Preferably, the process is used for the production of liquid fuel, especially diesel and gasoline, and preferably unleaded gasoline.
- The following experiments illustrate the suitability of zeolite-Y-based FCC catalysts (fresh and E-cat), for the isomerisation of linear olefinic products under typical Fischer-Tropsch process conditions.
Catalysts which are suitable for this purpose can be used either in the second step (as co-catalyst) or in the third step of the Fischer-Tropsch process in order to enhance the isomerisation of the linear olefinic products. - To this end, the performance of the FCC catalysts was tested in a hydroisomerization of 1-hexene. The reaction conditions (temperature, total pressure and dihydrogen pressure) for the performance tests were identical to the conditions present in a typical high temperature Fischer-Tropsch process:
Temperature : 340°C Total Pressure : 20 bar Catalyst intake : 2.2 g WHSV, 1-Hexene : 2.85 g/g/hr (based on zeolite present) H2 Partial pressure : 9 bar N2 Partial pressure : 10.8 bar 1-Hexene Partial pressure : 0.22 bar Mole ratio H2/1-Hexene : 40.9 Mole ratio N2/1-Hexene : 49.1 - The FCC catalysts were reduced in situ in the reactor under 20 bar hydrogen pressure 340°C for 1 hr. After the reduction procedure was completed, the nitrogen flow was introduced and subsequently 1-hexene was dosed (0.11 ml/min). The composition of the reaction product was followed by on-line GC analysis.
- Three different types of FCC catalysts were tested according to this procedure: a fresh FCC catalyst containing a low amount of rare earth (RE), a fresh FCC catalyst containing a high amount of rare earth metals, and an equilibrium FCC catalyst (E-cat) resulting from the FCC catalyst with a low amount of RE.
The product distribution obtained in these tests at 0.5 hr and at 17.5 hr runtime are presented in Tables 1 and 2, respectively. - In these Tables, n-C6 refers to normal C6 paraffins, i-C6 refers to branched C6 paraffins, n-C6 = refers to normal C6 olefins, i-C6 = refers to branched C6 olefins, and <C6 and >C6 refers to compounds with less and more than 6 carbon atoms, respectively.
Table 1 - test results at 0.5 hr. runtime Fresh FCC Fresh FCC E-cat low RE high RE Conversion 1-hexene, wt% 93.8 99.4 94.0 n-C6, wt% 19.8 28.5 29.6 i-C6, wt% 19.2 41.6 13.7 n-C6=, wt% 9.4 0.7 24.3 i-C6=, wt% 32.8 3.2 24.5 <C6, wt% 10.9 20.2 4.4 >C6, wt% 8.2 6.0 3.7 i-C6 + i-C6=, wt% 52.0 44.8 38.2 Table 2 - test results at 17.5 hr. runtime Fresh FCC Fresh FCC E-cat low RE high RE Conversion 1-hexene, wt% 90.8 91.4 91.8 n-C6, wt% 10.0 11.0 15.5 i-C6, wt% 12.8 14.9 9.3 n-C6=, wt% 20.2 15.1 39.3 i-C6=, wt% 47.3 45.6 30.6 <C6, wt% 3.4 5.3 3.0 >C6, wt% 6.5 8.4 2.7 i-C6 + i-C6=, wt% 60.1 60.5 39.9 - As can be seen from these tables, the fresh FCC catalyst with a low amount of RE has a high selectivity to branched C6 olefins (i-C6=) and branched C6 paraffins (i-C6). The total amounts of isomerized products at 0.5 hr and 17.5 hr runtime were 52.0 wt% and 60.1 wt%, respectively. This high isomerization selectivity was accompanied with a low level of cracking; only 3.4 wt% of products smaller than C6 (<C6) were obtained at 17.5 hr runtime. The amount of aromatic products was far below 1 wt% during the whole run.
- The fresh FCC catalyst with a high amount of RE also showed a high selectivity to branched C6 olefins (i-C6=) and branched C6 paraffins (i-C6). The total amounts of isomerized products at 0.5 hr and 17.5 hr runtime were 44.8 wt% and 60.5 wt%, respectively. The level of cracking was 5.3 wt% at 17.5 hr runtime. The amount of aromatic products was far below 1 wt% during the whole run.
- The equilibrium FCC catalyst showed a somewhat lower selectivity to branched C6 olefins (i-C6=) and branched C6 paraffins (i-C6) than the fresh FCC catalysts. The total amounts of isomerized products at 0.5 hr and 17.5 hr runtime were 38.2 wt% and 39.8 wt%, respectively. The level of cracking was only 3.0 wt% at 17.5 hr runtime. Again, the amount of aromatic products was far below 1 wt% during the whole run.
Although the level of isomerization of this E-cat was lower than that of the fresh FCC catalysts, it is still acceptable for use in the Fischer-Tropsch product, especially as co-catalyst in the second step.. - These experiments show that FCC catalysts are able to isomerise linear olefinic hydrocarbons under typical Fischer-Tropsch conditions. This indicates their suitability for use in the second and third step of the Fischer-Tropsch process.
Claims (11)
- Fischer-Tropsch process for the conversion of carbon monoxide and hydrogen to C5 + hydrocarbon mixtures in which process use is made of Fischer-Tropsch catalyst particles and zeolite Y-containing fluid catalytic cracking catalyst particles, said process comprising contacting the carbon monoxide and hydrogen with the Fischer-Tropsch catalyst particles at a pressure in the range from 10 to 60 bar leading to hydrocarbons and water, and isomerising the hydrocarbons with the fluid catalytic cracking catalyst particles.
- Process according to claim 1 wherein the mixture of carbon monoxide and hydrogen is contacted with a mixture of Fischer-Tropsch catalyst particles and fluid catalytic cracking catalyst particles, wherein the fluid catalytic cracking catalyst particles comprise from 5 to 40 wt% of said mixture.
- Process according to claim 2 wherein the Fischer-Tropsch catalyst particles and the fluid catalytic cracking catalyst particles are dosed individually to the reaction mixture.
- Process according to claim 2, wherein the Fischer-Tropsch catalyst particles and fluid catalytic cracking catalyst particles are used in the form of shaped bodies in which both particles are embedded.
- Process according to claim 1 wherein the step of contacting Fischer Tropsch catalyst particles with a mixture of carbon monoxide and hydrogen to form a C5+ hydrocarbon mixture is followed by a separate step of contacting the C5+ hydrocarbon mixture with the fluid catalytic cracking catalyst particles.
- Process according to any one of the preceding claims wherein the Fischer-Tropsch catalyst particles comprise iron.
- Process according to any one of the preceding claims wherein the Fischer-Tropsch catalyst particles comprise cobalt.
- Process according to any one of the preceding claims wherein the fluid catalytic cracking catalyst is a spent or equilibrium fluid catalytic cracking catalyst.
- Process according to any one of the preceding claims wherein a metal compound has been deposited on the fluid catalytic cracking catalyst particles.
- Process according to claim 1 comprising:a first step involving reacting a source of carbon with a source of oxygen to form a mixture of carbon monoxide and hydrogen;a second step in which the carbon monoxide and hydrogen are contacted with the Fischer-Tropsch catalyst particles leading to hydrocarbons and water; anda third step in which the hydrocarbons formed in the second step are isomerised; whereinthe zeolite Y-containing fluid catalytic cracking catalyst particles are used in the third step.
- Process according to any one of the proceeding claims in which the fluid catalytic cracking catalyst particles isomerise linear olefinic hydrocarbons.
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EP03810426A EP1558701B1 (en) | 2002-11-05 | 2003-10-30 | Fischer-tropsch process using a fischer-tropsch catalyst and a zeolite-containing catalyst |
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EP02079646 | 2002-11-05 | ||
EP02079646 | 2002-11-05 | ||
US42740802P | 2002-11-19 | 2002-11-19 | |
US427408P | 2002-11-19 | ||
PCT/EP2003/012166 WO2004041970A1 (en) | 2002-11-05 | 2003-10-30 | Fischer-tropsch process using a fischer-tropsch catalyst and a zeolite-containing catalyst |
EP03810426A EP1558701B1 (en) | 2002-11-05 | 2003-10-30 | Fischer-tropsch process using a fischer-tropsch catalyst and a zeolite-containing catalyst |
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EP1558701B1 true EP1558701B1 (en) | 2009-08-12 |
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AT (1) | ATE439415T1 (en) |
AU (1) | AU2003276228A1 (en) |
DE (1) | DE60328811D1 (en) |
DK (1) | DK1558701T3 (en) |
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FR2930733B1 (en) * | 2008-04-30 | 2014-04-11 | Inst Francais Du Petrole | ACTIVE OXYDO-REDUCTION MASS AND CHEMICAL LOOP COMBUSTION METHOD |
US9290700B2 (en) | 2014-08-11 | 2016-03-22 | Infra XTL Technology Limited | Method for preparing synthetic liquid hydrocarbons from CO and H2 |
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US3254023A (en) | 1964-06-08 | 1966-05-31 | Socony Mobil Oil Co Inc | Method of heat balancing in organic catalytic reactions |
US4906671A (en) * | 1985-08-29 | 1990-03-06 | Mobil Oil Corporation | Fischer-tropsch process |
US5928980A (en) * | 1997-02-06 | 1999-07-27 | Research Triangle Institute | Attrition resistant catalysts and sorbents based on heavy metal poisoned FCC catalysts |
US6255358B1 (en) | 2000-03-17 | 2001-07-03 | Energy International Corporation | Highly active Fischer-Tropsch synthesis using doped, thermally stable catalyst support |
CN100384964C (en) | 2000-06-20 | 2008-04-30 | Sasol技术股份有限公司 | Hydrocarbon synthesis catalyst and process |
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2003
- 2003-10-30 AT AT03810426T patent/ATE439415T1/en not_active IP Right Cessation
- 2003-10-30 DK DK03810426T patent/DK1558701T3/en active
- 2003-10-30 EP EP03810426A patent/EP1558701B1/en not_active Expired - Lifetime
- 2003-10-30 ES ES03810426T patent/ES2331517T3/en not_active Expired - Lifetime
- 2003-10-30 DE DE60328811T patent/DE60328811D1/en not_active Expired - Lifetime
- 2003-10-30 WO PCT/EP2003/012166 patent/WO2004041970A1/en not_active Application Discontinuation
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DE60328811D1 (en) | 2009-09-24 |
DK1558701T3 (en) | 2009-12-14 |
AU2003276228A1 (en) | 2004-06-07 |
ATE439415T1 (en) | 2009-08-15 |
ES2331517T3 (en) | 2010-01-07 |
EP1558701A1 (en) | 2005-08-03 |
WO2004041970A1 (en) | 2004-05-21 |
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