WO2021096952A1 - Conversion d'alcanes légers en combustibles liquides - Google Patents

Conversion d'alcanes légers en combustibles liquides Download PDF

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WO2021096952A1
WO2021096952A1 PCT/US2020/060005 US2020060005W WO2021096952A1 WO 2021096952 A1 WO2021096952 A1 WO 2021096952A1 US 2020060005 W US2020060005 W US 2020060005W WO 2021096952 A1 WO2021096952 A1 WO 2021096952A1
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Prior art keywords
alkanes
light
carbon atoms
hydrocarbons
olefins
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PCT/US2020/060005
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English (en)
Inventor
Jianhua Yao
Neal D. Mcdaniel
Bruce B. Randolph
Robert M. WALSTON
Anthony O. BALDRIDGE
James A. SUTTIL
Soumen KUNDU
Hong Xie
Steven E. Lusk
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Phllips 66 Company
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Publication of WO2021096952A1 publication Critical patent/WO2021096952A1/fr

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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING 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
    • C10G11/00Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G11/02Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils characterised by the catalyst used
    • C10G11/04Oxides
    • C10G11/05Crystalline alumino-silicates, e.g. molecular sieves
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING 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
    • C10G57/00Treatment of hydrocarbon oils, in the absence of hydrogen, by at least one cracking process or refining process and at least one other conversion process
    • C10G57/02Treatment of hydrocarbon oils, in the absence of hydrogen, by at least one cracking process or refining process and at least one other conversion process with polymerisation
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING 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
    • C10G2400/00Products obtained by processes covered by groups C10G9/00 - C10G69/14
    • C10G2400/26Fuel gas
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00Technologies relating to oil refining and petrochemical industry
    • Y02P30/20Technologies relating to oil refining and petrochemical industry using bio-feedstock

Definitions

  • the present disclosure relates to processes and systems for converting light paraffins to liquid hydrocarbon transportation fuels.
  • NGL natural gas liquids
  • the present inventive disclosure relates to processes and systems for converting a mixture of light paraffins into products that can be used as a liquid transportation fuel, or blend component thereof.
  • the process first contacts a light alkanes feed that may the full range of hydrocarbons typically found in natural gas liquids (NGL) with an aromatization catalyst under mild conditions of temperature and pressure that leaves most C2-C3 hydrocarbons unreacted.
  • NNL natural gas liquids
  • C2-C3 alkanes are then thermally-cracked to olefins and oligomerized in an oligomerization reactor maintains or increases overall yield while improving yield of hydrocarbons in the diesel boiling-point range.
  • Certain embodiments of the invention comprise the steps of: [outline steps of first independent claim]
  • the present inventive disclosure relates to processes and systems for converting a light alkanes feed stream to a hydrocarbon product (or products) that possesses the characteristics of a liquid transportation fuel (or a blend stock thereof), or that possesses the characteristics of an intermediate product that can be further upgraded via chemical processes to produce various value-added chemicals.
  • the light alkanes feed stream predominantly comprises alkanes containing from two to seven carbons (C2-C7), preferably alkanes comprising from C2- C5 carbon atoms (C2-C5).
  • the light alkanes feed stream comprises at least 50 wt.% alkanes and at least 90 mol% of these alkanes contain from two to four carbon atoms (C2-C4).
  • the light alkanes feed stream comprises at least 70 wt.% alkanes and at least 90 mol% of these alkanes contain from two to four carbon atoms (C2-C4). In certain embodiments, the light alkanes feed stream comprises at least 85 wt.% alkanes and at least 90 mol% of these alkanes contain from two to four carbon atoms (C2-C4).
  • the light alkanes feed stream comprises at least 50 wt.% alkanes and at least 97 mol% of these alkanes contain from two to six carbon atoms (C2-C6). In certain embodiments, the light alkanes feed stream comprises at least 70 wt.% alkanes and at least 97 mol% of the alkanes contain from two to six carbon atoms (C2-C6). In certain embodiments, the light alkanes feed stream comprises at least 85 wt.% alkanes and at least 97 mol% of the alkanes contain from two to six carbon atoms (C2-C6).
  • One source of the light alkanes feed stream is a naturally-occurring mixture of hydrocarbons produced from petroleum deposits that is commonly referred to as “Y-grade”.
  • the Y-grade sub-fraction of natural gas liquids predominantly comprises ethane, propane, butanes and pentanes, with residual quantities of hexane and heptane.
  • Y-grade typically has been de- methanized to remove methane that may be co-produced from petroleum deposits along with the C2-C7 hydrocarbons.
  • the light alkanes feed stream is first contacted with an aromatization catalyst at a temperature and a pressure that selectively facilitates the catalytic activation and aromatization of alkanes that contain from four to seven carbon atoms (C4-C7).
  • the remaining uncondensed light alkanes are thermally-cracked at a temperature that maximizes conversion of C2-C3 alkanes to olefins, thereby producing a second effluent predominantly comprising light olefins containing from two to four carbons and some larger hydrocarbons (C5+) that are condensed in the second separator.
  • the second effluent is contacted with an oligomerization catalyst at a pressure and temperature that facilitates the catalytic oligomerization of olefins to form higher molecular weight products that may be utilized as a transportation fuel or component thereof.
  • This approach is preferable to conventional processes that attempt to upgrade an entire C2-C7 feed in a single step by thermal cracking, catalytic dehydrogenation or catalytic cracking.
  • Thermal cracking of paraffins for olefin production is energy-intensive, and thermal cracking of ethane requires temperatures exceeding 800 °C.
  • Catalytic dehydrogenation potentially provides higher selectivity to desired products, but suffers from problems with catalyst deactivation, is especially susceptible to catalyst poisons (e.g., sulfur, nitrogen, carbon monoxide) and is subject to significantly more external competition.
  • Catalytic cracking of light paraffins also requires high temperatures that typically exceed 650 °C.
  • the inventive processes and systems disclosed herein describe a multi-step hydrocarbon conversion that improves the overall yield of products (compared to conventional processes) that can be utilized as a component of a liquid hydrocarbon transportation fuel.
  • the light alkanes feed stream contacts a first catalyst in an aromatization reactor to produce a first effluent, where the aromatization reactor is maintained at a temperature and pressure that is suitable to facilitate the selective catalytic activation and aromatization (or olefmization) of at least a portion of the C4-C7 alkanes in the light alkanes feed stream to monocyclic aromatics and olefins while leaving alkanes that contain from two to three carbon atoms largely unreacted, thereby producing a first effluent that comprises monocyclic aromatics (predominantly, benzene, toluene and xylene), olefins and unconverted light alkanes that contain three or less carbon atoms.
  • the first effluent is then partially condensed in a first separator, thereby producing a first pyrolysis gasoline fraction comprising olefins and aromatics containing at least four carbon atoms.
  • the first pyrolysis gasoline fraction may be further upgraded to products suitable for use as a liquid transportation fuel blend stock according to conventional methods known in the art, or alternatively utilized as a feed stock for any of a number of different chemical production processes.
  • the remaining uncondensed portion in the first separator is an uncondensed light alkane fraction that predominantly comprises unconverted ethane and propane.
  • This uncondensed light alkane fraction is next conveyed to a thermal cracking zone and thermally- cracked then quenched to produce a second effluent that comprises predominantly C2-C4 olefins, as well as some hydrogen, methane, C2-C4 alkanes, acetylene and a small amount of C5+.
  • Thermal cracking of light olefins is conventional in nature, and thus will not be discussed further here.
  • the second effluent is conveyed to a second separator that is operable to selectively condense the second effluent to produce a second pyrolysis gasoline comprising liquid hydrocarbons containing at least four carbon atoms.
  • the second pyrolysis gasoline may be combined with the first pyrolysis gasoline and further upgraded (as described above).
  • the remaining uncondensed portion of the second effluent comprises an uncondensed light olefins fraction that in turn predominantly comprises C2-C3 olefins.
  • These light olefins are conveyed to a third reaction zone containing at least one zeolite catalyst that is operable to convert the light olefins to larger hydrocarbons that may be combined with the first and/or second pyrolysis gasoline fractions and further upgraded (as described above).
  • NGL hydrocarbons Many conventional processes for upgrading NGLs require an expensive initial separation of the NGL hydrocarbons into fractions based upon carbon number, or carbon number range (e.g., C2, C3, C4-5, C6-C7, etc.). Each fraction is then separately upgraded in order to achieve efficient upgrading.
  • the upgrading processes disclosed herein improves efficiency relative to conventional processes and systems by efficiently upgrading an entire NGL stream (or C2-C7 light alkanes stream).
  • the present inventive processes thus eliminates the need to first separate an NGL feed into multiple fractions that are then separately upgraded.
  • the feed stream comprises what is commonly referred to in the art as a “Y-grade” fraction of natural gas liquids.
  • the first conversion is performed at conditions of temperature and pressure that are sufficient to convert mainly C4 and larger alkanes present in the feed stream to form products comprising aromatics, pyrolysis gasoline and some small alkanes (as a side-product).
  • the conditions utilized are insufficient to effectively facilitate upgrading of smaller C2-C3 hydrocarbons, leaving them largely unreacted.
  • the inventors hypothesize (while not allowing the inventive disclosure be limited by theory) that these less- reactive C2-C3 alkanes act as an inert diluent in the aromatization reactor, thereby decreasing the rate of catalyst coking and extending useful lifespan of the aromatization catalyst.
  • a further advantage of the first conversion being conducted in the presence of C2-C3 alkanes is that the selective catalytic conversion of C4 and larger alkanes (present in the feed stream) to form products comprising aromatics and pyrolysis gasoline can be conducted at lower temperatures when in the presence of less reactive C2-C3 hydrocarbons.
  • the present application demonstrates that the temperature required to achieve 50% catalytic activation for light alkanes (the first step in a hydrocarbon aromatization reaction) is significantly decreased when the catalytic activation is performed in the presence of smaller, less reactive alkanes. This further increases the efficiency of the inventive process.
  • the selective catalytic conversion of C4+ alkanes that occurs in the aromatization reactor also advantageously facilitates the separation of unreacted C2-C3 hydrocarbons from aromatics and other C4+ hydrocarbons that are produced in the aromatization reactor and that are present in the first effluent.
  • This separation typically occurs in the first separator by simple selective condensation of the aromatics and residual C4+ hydrocarbons from the first effluent.
  • the remaining uncondensed hydrocarbons comprise a light alkanes stream that predominantly comprises C2-C3 alkanes.
  • This light alkanes stream is then conveyed to a thermal cracking reactor where it is thermally-cracked and converted to a second effluent comprising light olefins.
  • the inventive processes and systems thus increase efficiency and decrease operating costs by avoiding any need to separate the C2-C7 hydrocarbon feed stream into separate fractions according to carbon number (e.g., C2-C3 alkanes fraction and C4+ alkanes fraction) prior to upgrading the separated components. Instead, separation is integrated with the selective conversion of C4+ alkanes from the C2-C7 hydrocarbon feed stream that takes place in the aromatization reactor.
  • carbon number e.g., C2-C3 alkanes fraction and C4+ alkanes fraction
  • Another potential advantage associated with the present inventive processes and systems is that larger C4-C7 alkanes are selectively converted at a lower temperature and pressure relative to conventional aromatization processes.
  • This lower temperature allows C2-C3 alkanes in the feed stream to pass through the aromatization reactor largely unreacted, while simultaneously minimizing the catalytic cracking of C4-C7 alkanes to undesirable butadiene and acetylene contaminants.
  • Such contaminants can deactivate downstream upgrading catalysts and must be removed from conventional process that crack larger alkanes.
  • Still another potential advantage of the present inventive processes and systems is that the smaller hydrocarbons present in the C2-C7 hydrocarbon feed stream (in particular, the less chemically-reactive C2-C3 alkanes) may function as an inert (or optionally, a chemically less- reactive) diluent of the conversion reactions that occur in the aromatization reactor.
  • Such diluents typically reduce the rate of coke formation on the aromatization catalyst in the aromatization reactor, which decreases the rate of catalyst deactivation and extends the time between required catalyst regeneration cycles.
  • a light hydrocarbons feed stream 101 is catalytically converted in a system 100.
  • Light hydrocarbons feed stream 101 predominantly comprises alkanes that each contain from two to seven carbon atoms (alternatively, alkanes containing from two to five carbon atoms) and is received by an aromatization reactor 105 that contains an aromatization catalyst 110.
  • the light alkanes feed stream comprises at least 97 wt.% alkanes containing from two to six carbon atoms and a residual quantity of alkanes containing seven carbon atoms.
  • Selective aromatization of C4-C7 paraffins in the aromatization reactor is generally believed to involve catalytic activation of the alkanes rapidly followed by dehydrogenation to yield light olefins. The olefins are then oligomerized followed by rapid cyclization to yield naphthenes, which undergo an additional dehydrogenation step to yield a monocyclic aromatic product.
  • the aromatization catalyst may comprise alumina, silica, or one or more of any of variety of different zeolite catalysts, including, but not limited to, HZSM-5, HZSM-6, HZSM-8, HZSM-11, MCM-22, MCM-41, mordenite, MFI, USY and FSM-16.
  • the aromatization catalyst may further be impregnated with one or more metals, including, but not limited to Pt, Ni, Mo, Mn, Cu, W, Zn, Re, Fe, V, Ag and Ga.
  • the degree of metal loading on the zeolite catalyst may also affect the efficiency of aromatization, and generally ranges from 2 wt.% to 10 wt.%.
  • more than one metal may be impregnated on the aromatization catalyst, where one metal increases the dehydrogenation activity of the catalyst to increase aromatic yield.
  • the Si/Al ratio of the catalyst support must be kept within certain parameters to control the total acidity of the catalyst and also the number of Lewis acidic sites. Typically, Si/Al ratios of 40-200 of the zeolite framework have been noted to produce optimal aromatic yields.
  • ZSM-5 is utilized as aromatization catalyst, a Si/Al ratio for the catalyst support that ranges from 45 to 55 is preferred.
  • the aromatization reactor is maintained at a temperature and pressure that predominantly converts alkanes containing four or more carbon atoms to at least one of olefins and aromatics, while leaving nearly all alkanes containing two or three carbon atoms unreacted.
  • Example 1 discusses in greater detail the considerations that are required when selecting a temperature to be maintained in the aromatization reactor that will achieve this result.
  • the feed weight hourly space velocity in the aromatization reactor can range anywhere from 0.5 to 5 hr-1, but is most preferably between 1.0 and 1.5 hr 1 .
  • the temperature and the pressure that are maintained in the aromatization reactor are suitable to produce first effluent comprising at least 15 wt.% of monocyclic aromatics while leaving unreacted at least 75 mol% of C2-C3 alkanes that were present in the light alkanes feed stream. In certain embodiments, the temperature and the pressure that are maintained in the aromatization reactor are suitable to produce first effluent comprising at least 15 wt.% of monocyclic aromatics while leaving unreacted at least 85 mol% of C2-C3 alkanes that were present in the light alkanes feed stream.
  • the temperature and the pressure that are maintained in the aromatization reactor are suitable to produce first effluent comprising at least 15 wt.% of monocyclic aromatics while leaving unreacted at least 95 mol% of C2-C3 alkanes that were present in the light alkanes feed stream.
  • the temperature maintained in the aromatization reactor is in the range from 350 °C to 575 °C; optionally, in the range from 350 °C to 500 °C; optionally, in the range from 400 °C to 500 °C.
  • the partial pressure of C4 to C7 alkane maintained in the aromatization reactor is in the range from 10 psig to 100 psig; optionally in the range from 5 psig to 75 psig.
  • activated alkane intermediates (not depicted) are converted by the aromatization catalyst 110 to produce a first effluent 113 comprising monocyclic aromatics, some olefins and unreacted light alkanes, which leaves the aromatization reactor 105 and is conveyed to a first separator 115.
  • First separator 115 is operable to receive the first effluent 113 and selectively condense aromatic hydrocarbons and other hydrocarbons containing at least 4 carbon atoms to produce a first condensed liquid hydrocarbons 126 that predominantly comprises benzene, toluene and xylene,
  • the first condensed liquid hydrocarbons 126 leaves the first separator 115 via a first outlet 122, while an uncondensed light hydrocarbons 128 largely comprising alkanes containing from 2-3 carbon atoms leaves the first separator 115 via a second outlet 126.
  • the first condensed liquid hydrocarbons 126 may be used as a component of a liquid transportation fuel, sold as a value-added industrial chemical, or further catalytically upgraded in one of many conventional process that are outside the scope of the present disclosure.
  • the uncondensed light hydrocarbons 128 is next conveyed to a thermal cracking reactor 130 that is operable receive the uncondensed light hydrocarbons 128 and further operable to maintain a temperature that is sufficient to thermally activate and convert at least a portion of alkanes present in the uncondensed light hydrocarbons 128, thereby producing a second effluent 133 that predominantly comprises olefins and dienes containing from two to seven carbon atoms, along with some hydrogen, methane, CO, CO2, pyrolysis gasoline and unreacted alkanes containing from one to three carbon atoms.
  • the thermal cracking reactor 130 is further operable to receive a steam feed 131 that facilitates thermal cracking of the uncondensed light hydrocarbons 128.
  • Thermal cracking also commonly referred to as steam cracking, is a process for thermally-dehydrogenating alkanes at temperatures exceeding 800 °C. Thermal cracking of alkanes is conventional in nature, and well characterized. Thus, it will not be described in further detail here.
  • the second effluent 133 leaves the thermal cracking reactor 130 and is conveyed into second separator 140 that is operable to receive and rapidly cool the second effluent 133 and prevent additional cracking reactions.
  • the second separator 140 is further operable to condense at least a portion of the second effluent 133 to produce a second condensed liquid hydrocarbons 142 that comprises hydrocarbons containing five or more carbon atoms.
  • the second condensed liquid hydrocarbons 142 exits the second separator 140 via a first outlet 143.
  • the second condensed liquid hydrocarbons 142 after removing water, may be combined with the first condensed liquid hydrocarbons 126 and used as a component of a liquid transportation fuel, may be sold as a value-added industrial chemical, or may be further catalytically upgraded in one of many conventional process that are outside the scope of the present disclosure.
  • the remaining uncondensed portion of the second effluent 133 comprises a light olefins stream 145 comprising C2-C4 olefins and residual alkanes containing three or less carbon atoms.
  • the light olefins stream 145 leaves the second separator 140 via a second outlet 147 and is conveyed into an oligomerization reactor 150.
  • the oligomerization reactor 150 contains at least one oligomerization catalyst 155.
  • the oligomerization reactor 150 is operable to receive the light olefins stream 145 and facilitate contact between the light olefin stream 145 and the oligomerization catalyst 155 at conditions of temperature and pressure that facilitate the conversion of olefins that are present in raw light olefin stream 145 to produce a third effluent 157 comprising hydrocarbons that are characterized by an average higher molecular weight relative to the average molecular weight of molecules in the light olefin stream.
  • the third effluent 157 further comprises hydrocarbons that contain at least five carbon atoms, (preferably, at least 7 carbon atoms).
  • the oligomerization reactor is maintained at a temperature and a pressure that facilitate the catalytic conversion of the light olefin stream by the oligomerization catalyst to produce a third effluent comprising at least 80 wt.% of hydrocarbons that contain at least five carbon atoms.
  • the contacting of the light olefin stream with the oligomerization catalyst occurs at a temperature in the range from 100 °C and 450 °C; optionally, in the range from 225 °C to 400 °C.
  • the contacting of the light olefin stream with the oligomerization catalyst occurs at a pressure in the range from 0 psig to 300 psig; optionally, in the range from 50 psig to 200 psig; optionally, in the range from 0 psig to 150 psig.
  • the oligomerization catalyst is optionally a zeolite, although any catalyst understood to be capable of oligomerizing olefins may be utilized.
  • the oligomerization catalyst is ZSM-5.
  • the oligomerization catalyst may comprise any solid catalyst (or mixture of catalysts) characterized as possessing either Bronsted or Lewis acidic properties.
  • the oligomerization catalyst is a zeolite or mixture of zeolites, or a reactive transition metal oxide.
  • the oligomerization catalyst is ZSM-5, although many zeolites are well characterized as possessing oligomerization properties and may be suitable for use (either alone or in combination) with the processes and systems described herein.
  • Other well-characterized oligomerization catalysts include, but are not limited to nickel oxides, aluminum alkyls, aluminum halides, perfluoroaryl boranes, oligomeric methyl aluminoxanes (including supported), perfluoroaryl boranes, fluoroarylanes, trityl borate, ammonium borate (and aluminate salts thereof), supported [PhNMe2H + ][B(C6F5)4 ] and borate anions and super acidic solid Bronsted acids, among others.
  • the catalyst, temperature and pressure in the oligomerization reactor are operable to facilitate the conversion of C2-C3 olefins to larger hydrocarbons that may be used as a liquid transportation fuel component that are typically characterized by an increased average molecular weight (relative to the light olefins stream) and are optionally further characterized by a boiling point ranging from about 40 °C to about 245 °C at 1 atm, which is within in the boiling point range of a conventional gasoline fuel.
  • the temperature, pressure and feed rate (weight hourly space velocity) maintained in the oligomerization reactor facilitate catalytic conversion by the oligomerization catalyst of at least 85 mol% of olefins containing from two to four carbon atoms that are present in the light olefin stream.
  • the temperature, pressure and feed rate of the light olefin stream that are maintained in the oligomerization reactor facilitate the catalytic conversion of the light olefin stream by the oligomerization catalyst to produce a third effluent comprising at least 50 wt.% (optionally at least 60 wt.%; optionally at least 70 wt.%; optionally, at least 80 wt.%) of hydrocarbons that contain at least five carbon atoms.
  • the feed weight hourly space velocity of the light olefin stream through the oligomerization reactor ranges anywhere from 0.5 to 5 hr 1 , but is most preferably between 1.0 and 1.5 hr 1 .
  • the third effluent 157 exits the oligomerization reactor 155 and is conveyed to a third separator 160 that is maintained at a temperature that allows the selective condensation of hydrocarbons comprising at least five carbon atoms.
  • a third condensed liquid hydrocarbons 165 comprising hydrocarbons containing at least five carbon atoms exits the third separator 160 via a first outlet 167.
  • a light hydrocarbon stream 168 comprising hydrocarbons characterized by four or less carbon atoms remains in vapor-phase and exits the third separator 160 via a second outlet, whereupon it is conveyed to a fourth separator 170 that separates the light hydrocarbon stream into a hydrogen and methane stream 175 and a light olefins and light alkanes stream 178 that is conveyed back to thermal cracking reactor 130 (or optionally, a point upstream from thermal cracking reactor 130).
  • the light olefins and light alkanes stream 178 predominantly comprises ethylene and ethane, but also may include some residual olefins and alkanes comprising three or four carbon atoms that were not converted to larger hydrocarbons in the oligomerization reactor 150.
  • certain embodiments further comprise mixing two or more of the first condensed liquid hydrocarbons, the second condensed liquid hydrocarbons and the third condensed liquid hydrocarbons to produce a final liquid product hydrocarbons comprising hydrocarbon molecules that are characterized by a boiling point that is in the range of gasoline (40 °C to 193 °C) or diesel (193 °C to 360 °C).
  • Conditions of temperature and pressure are maintained in the oligomerization reactor 150 that facilitate the oligomerization of ethylene and propylene to form larger hydrocarbon products that preferably comprise at least five carbon atoms (optionally, at least 7 carbon atoms).
  • the contacting of the light olefin stream with the oligomerization catalyst occurs at a temperature in the range from 100 °C and 450 °C; optionally, in the range from 225 °C to 400 °C; optionally, in the range from 250 °C to 350 °C.
  • the contacting of the light olefin stream with the oligomerization catalyst occurs at a pressure in the range from 0 psig to 300 psig
  • the operating conditions for the oligomerization reactor 150 generally include a pressure in a range from 0 psig to 300 psig; optionally at a pressure in the range from 50 psig to 200 psig.
  • the feed rate to the oligomerization reactor is (measured as a gas hourly space velocity) in a range from 0.5 hrs 1 to 5 hrs 1 . While higher overall productivity is desirable, typically at least 85% of the ethylene present in the light olefins stream is converted in the oligomerization reactor.
  • the unconverted light gases are subjected to separation in a fourth separator into a hydrogen, methane and a C2-C3 light alkanes stream that predominantly comprises ethane.
  • the hydrogen and methane are combusted to supply process heat, while the C2-C3 light alkanes stream may be conveyed to a point that is upstream from the cracking furnace and downstream from the first separator, where it is mixed with the uncondensed light hydrocarbons.
  • the fourth separator utilizes pressure swing adsorption to separate the unconverted light gases.
  • Table 1 (below) demonstrates the temperature (°C) required to achieve 50% equilibrium conversion of a given hydrocarbon species by carbon number (e.g., C2, C3, C4, C5) or mixture of hydrocarbon species (i.e., C6+) when the converted hydrocarbon species (1 st column, far left) is converted in the presence of a feed stream comprising C2+, C3+, C4+ and C5+ hydrocarbons (columns 2-5), or as a pure species (column 6 ) at 1 Atm pressure (0 psig).
  • C6+ is defined as a light hydrocarbon feed stream comprising alkanes containing six or more carbon atoms.
  • the values shown are not an average or weighted-average, but rather the result of a mixed-equilibrium simulation.
  • the calculations assume no dilution of the feed with steam or inert gases, no C-C bond cracking (or formation) , and ambient total feed pressure for all simulations.
  • Table 1 Temperature required for conversion of an alkane of a given carbon number (first column) when mixed with a hydrocarbon feed comprising alkanes of various minimum carbon number (columns 2-5) or as a pure feed (sixth column). Temps are listed in °C.
  • Table 1 shows an advantage of the present inventive method and system by demonstrating that C4-C6 hydrocarbons are catalytically activated at a lower temperature when in the presence of other hydrocarbon compounds, particularly in the presence of less reactive C2- C3 hydrocarbons.
  • equilibrium conversion of 50 wt.% of a hydrocarbon species containing five carbon atoms (C5) is accomplished a 388 °C when in the presence of a feed comprising C2+ hydrocarbons.
  • equilibrium conversion of 50 wt.% of C5 hydrocarbons in a feed containing only C5 hydrocarbons requires a temperature of 510 °C.
  • a simulated cracked light olefin feed stream was utilized that comprised 23 mole% hydrogen, 23 mole% methane, 14 mole% ethane, 31 mole% ethylene, 6.5 mole% propylene, and 2.5 mole% 1 -butene.
  • This feed stream was designed to replicate a typical cracked olefin stream that is produced by the thermal cracking of the light olefins stream derived from the first separator.
  • the feed stream was introduced to an oligomerization reactor containing a ZSM-5 zeolite catalyst.
  • the reactor was maintained at a temperature of 320 °C and pressure of 50 psig.
  • the effluent from the oligomerization reactor was then partially condensed to recover C5+ liquid hydrocarbons. Analysis of the liquid products condensed from the reactor effluent and the overall product distribution is reported in Table 2, below.
  • Table 2 Oligomerizing mixed light olefins to liquid hydrocarbon fuels on ZSM-5 catalyst using single stage process.
  • the term “catalytic activation” is defined as a chemical reaction facilitated by a catalyst that forms an activated hydrocarbyl intermediate from a C-H bond.
  • the hydrocarbyl intermediate can then be functionalized to produce either an olefin or a larger hydrocarbon product via a mechanism that may include at least one of dehydrogenation, olefmation, arylation, alkylation, dimerization, oligomerization, isomerization and aromatization.

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

La présente divulgation concerne d'une manière générale des procédés et des systèmes permettant de convertir une charge d'alcanes légers en C2-C7 en des combustibles liquides de transport ou en des produits chimiques à valeur ajoutée. La charge est mise en contact avec un catalyseur d'aromatisation à une température et sous une pression qui sélectivement convertissent les alcanes en C4 et plus en un produit intermédiaire comprenant des composés aromatiques monocycliques et des oléfines. Après séparation des composés aromatiques et des hydrocarbures en C5+ du produit intermédiaire, les alcanes en C2-C3 non convertis sont soumis à un craquage thermique afin de produire des oléfines qui sont ensuite oligomérisées pour produire une base de mélange de combustibles liquides de transport ou des produits chimiques à valeur ajoutée.
PCT/US2020/060005 2019-11-12 2020-11-11 Conversion d'alcanes légers en combustibles liquides WO2021096952A1 (fr)

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WO2023240380A1 (fr) * 2022-06-13 2023-12-21 天津大学滨海工业研究院有限公司 Carburant hydrocarboné liquide endothermique et son procédé de préparation

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US8784617B2 (en) * 2010-01-29 2014-07-22 EVOenergy, LLC Process of converting gaseous hydrocarbons to a liquid hydrocarbon composition
US20140378719A1 (en) * 2013-06-24 2014-12-25 Reaction 35, Llc Coupling of Light Alkanes to Liquid Fuels
US9657238B2 (en) * 2014-10-03 2017-05-23 Saudi Arabian Oil Company Process for producing aromatics from wide-boiling temperature hydrocarbon feedstocks

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US3928483A (en) * 1974-09-23 1975-12-23 Mobil Oil Corp Production of gasoline hydrocarbons
US20120238787A1 (en) * 2007-12-03 2012-09-20 Gruber Patrick R Renewable compositions
US8784617B2 (en) * 2010-01-29 2014-07-22 EVOenergy, LLC Process of converting gaseous hydrocarbons to a liquid hydrocarbon composition
US20140378719A1 (en) * 2013-06-24 2014-12-25 Reaction 35, Llc Coupling of Light Alkanes to Liquid Fuels
US9657238B2 (en) * 2014-10-03 2017-05-23 Saudi Arabian Oil Company Process for producing aromatics from wide-boiling temperature hydrocarbon feedstocks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023240380A1 (fr) * 2022-06-13 2023-12-21 天津大学滨海工业研究院有限公司 Carburant hydrocarboné liquide endothermique et son procédé de préparation

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