EP1357167A1 - Procédé pour la production d'essence de haute qualité à faible teneur en aromatiques - Google Patents

Procédé pour la production d'essence de haute qualité à faible teneur en aromatiques Download PDF

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Publication number
EP1357167A1
EP1357167A1 EP03006545A EP03006545A EP1357167A1 EP 1357167 A1 EP1357167 A1 EP 1357167A1 EP 03006545 A EP03006545 A EP 03006545A EP 03006545 A EP03006545 A EP 03006545A EP 1357167 A1 EP1357167 A1 EP 1357167A1
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Prior art keywords
isomerisation
branched isomers
catalyst
mono
branched
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EP03006545A
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German (de)
English (en)
Inventor
Jindrich Houzvicka
John Zavilla
Cecilia Jaksland
Konrad Herbst
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Topsoe AS
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Haldor Topsoe AS
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    • 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
    • C10G59/00—Treatment of naphtha by two or more reforming processes only or by at least one reforming process and at least one process which does not substantially change the boiling range of the naphtha
    • C10G59/02—Treatment of naphtha by two or more reforming processes only or by at least one reforming process and at least one process which does not substantially change the boiling range of the naphtha plural serial stages only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
    • C10G2400/02—Gasoline

Definitions

  • the present invention relates to a process for the production of high quality gasoline with reduced content of aromatic compounds.
  • the invention is a catalytic two stage isomerisation process of C 4 -C 12 paraffinic hydrocarbons to multi-branched hydrocarbons.
  • Multi-branched paraffins are ideal gasoline blending components possessing high octane numbers. For environmental reasons there is also a need to find substitutes for aromatic components in gasoline. Therefore, there is an incentive to develop a process for increasing octane number of the C 4 -C 12 cuts. While C 5 /C 6 paraffin isomerisation is a common refinery process, commercialisation of processes including higher fractions (C 7+ hydrocarbons) meets significant difficulties given by high degree of cracking to gas and low octane number of the once-through products.
  • the present invention relates to a catalytic process, where combinations of given steps allow sufficient yields of products with high octane numbers also for the C 7+ hydrocarbon fraction. The process can thus convert the complete C 4 -C 12 cut, or it can solely be designed for the C 7+ fraction.
  • the C 7+ fraction is difficult to isomerise because of several reasons. Unlike the C 5 /C 6 paraffins, mono-branched C 7+ isomers possess too low octane number. Octane number is around 50 for methylhexanes, and linear molecules have RON equal to zero or even negative when blended with other hydrocarbons. Only multi-branched paraffins are valuable blending components, but their concentration is limited by thermodynamics. A maximum of 40% of multi-branched C 7 isomers can be formed by passing n-heptane once-through over an isomerisation catalyst at 230°C. This number increases to 50% at 150°C. All mono-branched and linear isomers have to be removed from the product and recycled with close to 100% selectivity. Although separation of linear isomers is a common technology, no efficient and economical process to separate mono-branched from multi-branched isomers is operational.
  • C 7 and longer paraffin molecules are very susceptible to cracking. Unlike their shorter counterparts, heptane and longer molecules can crack fully via tertiary carbenium ion, thus their cracking requires relatively low activation energy.
  • the reaction intermediate is identical for both isomerisation and cracking paths, therefore it is very difficult to separate both reactions.
  • FR Patent No. 2,771,307 describes the use of a catalyst based on AlCl 3 in n-heptane isomerisation at 110°C. Although the branched isomers represent only 73% of the C 7 paraffin fraction (with this conversion vast majority of the products are still mono-branched isomers) cracking is already 7%.
  • 4,956,521 describes a C 5 /C 6 isomerisation process that includes separation of the product stream by PSA using silicalite and Ca-A zeolites as adsorbents.
  • Another possibility for separation is zeolite membranes. Use of zeolite membranes for a broad spectrum of possible applications was described in U.S. Patent No. 5,069,794, among others very generally also for paraffin isomer separation.
  • Still another possibility is using chromatography separation on various adsorbents. The separation proceeds by passing the hydrocarbon mixture through the column filled with molecular sieve and the separated streams of products are withdrawn in the end of the column.
  • the first reactor typically operates at high temperature to achieve high space velocities, while the second reactor is operating at much lower temperature to achieve thermodynamically more favourable product composition.
  • This configuration is used for example in the Penex Process (UOP).
  • UOP Penex Process
  • the purpose of this configuration is mainly to limit the catalyst and reactor volume. The same or better selectivity can be obtained by simply increasing the reactor volume and operating at the temperature used in the second reaction zone. If the selectivity is the main issue this configuration is not sufficient and substantially different catalysts and conditions must be used as shown in this invention.
  • EP 653,400 A A two reactor configuration is also disclosed in EP 653,400 A.
  • This application describes a process for preparation of multi-branched paraffins from a feed consisting of linear paraffins of at least 5 carbon atoms.
  • the process comprises two molecular sieve units, in which mono-branched isomers are produced on shape selective 10-membered ring molecular sieve, while multi-branched isomers should be produced in the next stage on zeolite with large pores to avoid cracking. No experimental data are, however, presented.
  • the general object of this invention is to provide increased octane numbers of a C 4 -C 9 hydrocarbon mixture through isomerisation in a multi-stage process without substantial cracking of produced multi-branched hydrocarbons.
  • "Multi-Branched Isomers" as used herein before and in the following description means compounds containing more than one carbon atom having bond to at least three other neighbouring carbon atoms.
  • Mono-branched isomers are defined as compounds containing just one such atom.
  • the general embodiment of the invention is a combination of two catalytic steps.
  • linear paraffins are activated by being selectively converted to predominantly mono-branched isomers at high temperatures (typically around 200°C) on solid catalysts.
  • Mono-branched isomers are further converted in a second step under much milder conditions typically at temperature 100°C lower, preferably in presence of a liquid catalyst.
  • the milder conditions which are essential to suppress cracking, can be applied since mono-branched isomers are significantly more reactive than n-paraffins. They are readily converted under conditions, when n-paraffin reaction is still slow.
  • the catalytic system in the second stage is not limited to liquids, these materials are more attractive than solid catalysts, since they are stronger acids and their acid strength is more uniform. Since the liquids can be easier handled than solids, they are also easier to reactivate.
  • the main intermediate for heptane cracking is 2,4-dimethylpentane carbenium ion, which is also the basic isomerisation intermediate.
  • Isomerisation starting from mono-branched isomers requires only tertiary carbenium ion, which has low energy of formation.
  • Both cracking and n-heptane activation need the more energetically demanding secondary ion. Cracking and heptane isomerisation are thus almost inseparable under normal conditions, where selectivities are too poor. It is possible, however, to use the subtle differences in activation energies by dividing the process into two steps.
  • Handbook of Heterogeneous Catalysis Eds. G. Ertl, H. Knözinger and J.
  • the first choice is use shape selective molecular sieve as a catalyst, which does not allow formation of bulky (multi-branched) cracking intermediate.
  • the other option is to operate at such conversion that concentration of multi-branched isomers is relatively far from thermodynamic equilibrium and thus cracking is limited.
  • the second option is based on the simple fact that mono-branched isomers are necessary and first step on the way to multi-branched isomers. It is almost always possible to stop the reaction in the stage, when some mono-branched isomers (typically at least 50%) are formed with almost no reaction to multi-branched isomers and cracking.
  • the multi-stage process consists of the following steps:
  • mono-branched paraffins are prepared from linear molecules on shape selective molecular sieves. These acidic molecular sieves do not allow further (double and triple) branching due to steric reasons. They possess pores of which the minor axis has a minimum width of 4 ⁇ and the major axis has a maximum width of 7 ⁇ and the average value of the both axes should be in the range from 4.5 to 6.5 ⁇ . The material should not contain any cavities which diameter is larger than 8 ⁇ .
  • the molecular sieves can be any of the following structural type: AEL (for example SAPO-11, MeAPO-11), AFO (for example SAPO-41 or MeAPO-41), FER (for example ferrierite, FU-9 or ZSM-35), MFS (for example ZSM-57), MTT (for example ZSM-23, EU-13 or ISI-4), MWW (for example MCM-22 or ITQ-1) and TON (for example Theta-1, ZSM-22, ISI-1 or NU-10).
  • the preferred material is the AFO type.
  • the catalyst (in acidic form) would further typically contain a binder (alumina for example) and noble metal with loading of 0.05 to 1 wt%.
  • the noble metal is typically Pt or Pd or a mixture thereof, which are most suitable to achieve sufficient selectivity and to suppress deactivation.
  • the reaction proceeds in presence of hydrogen with hydrogen to hydrocarbon ratio between 0.1 to 5, at the temperature range 150°C to 400°C with a total pressure varying between 1 and 40 bar and liquid hourly space velocity LHSV between 0.1 to 30 h -1 .
  • the C 4 /C 10 hydrocarbon streams contain typically a significant fraction of aromatics, which content is strictly limited by legislation (especially in the case of benzene).
  • the aromatic compounds are hydrogenated, but ring opening of cycloalkanes formed is limited to minimum by shape selective properties of the catalyst.
  • the shape selective properties mean that there is not enough space (pore diameter) around the active sites to form intermediate leading to this reaction. This is important not only to keep high octane number of the product, but also for a proper function of the liquid catalyst during the second isomerisation step.
  • Another possibility in the first step is to use a non-shape selective catalyst, and to operate sufficiently far from thermodynamic equilibrium between mono and multi-branched isomers.
  • the multi-branched isomers crack much faster than their mono-branched counterparts, and if their concentration is sufficiently low cracking can be limited.
  • Mono-branched isomers are by definition the first products of isomerisation of linear molecules. The reaction can always be stopped in such stage, when extent of following reactions (isomerisation to multi-branched isomers and cracking) is low so that cracking is below 5%.
  • suitable catalysts are materials based on tungsten oxide or tungsten containing compounds both supported or unsupported.
  • Tungsten oxide catalysts supported on zirconia, hafnia, titania or SnO 2 are of main interest.
  • all oxides of group VI elements supported on group IV oxides are potential candidates for the application (using current IUPAC nomenclature for the periodic table of elements).
  • Yet another group of materials applicable are heteropoly acids consisting of Keggin ion structures. The most typical examples are phosphotungstic and silicotungstic acids.
  • Friedel-Crafts catalysts based on AlCl 3 can also be used for this application.
  • the other group of catalysts also requires the presence of 0.05 to 1 wt% of noble metal.
  • the noble metal is typically Pt or Pd or a mixture thereof.
  • the reaction proceeds in the presence of hydrogen with a hydrogen to hydrocarbon ratio between 0.1 to 5 at the temperature range 150°C to 300°C with total pressure varying between 1 and 40 bar, and liquid space velocity LHSV between 0.1 to 30 h -1 .
  • the purpose of the second reaction step is to increase the concentration of multi-branched isomers under conditions without cracking. This can be done by tuning reaction conditions and catalyst most significantly influenced by varying the reaction temperature and the catalyst acid strength.
  • Materials especially suitable for the second step are liquid super acids. There might be various liquid catalysts used for example a range of fluorinated alkanesulfonic acids, HF, sulphuric acid, etc., optionally promoted with strong Lewis acids like SbF 5 .
  • the other preferred materials are ionic liquids, i.e. complexes of group III halogenides with quarternary amines. An example of such a material is a mixture of trimethylammonium hydrochloride and aluminium chloride in ratio 1:2. Advantage of these materials is their non-miscibility with the hydrocarbon phase, their very low viscosity, their low vapour pressure and their non-dangerous handling as concern corrosion.
  • the total process scheme is based on the combination of two reaction steps described in the above paragraphs and at least one separation step. All these steps can be combined in various ways.
  • the simplest process is shown schematically in Fig. 1.
  • R1 is the isomerisation unit operating with the solid catalyst and R2 is the second isomerisation step.
  • the hydrocarbon feedstock is passed via line 1 to the first isomerisation unit R1.
  • the effluent from R1 comprising predominantly linear and mono-branched isomers is passed via line 2 to the second isomerisation unit R2.
  • the effluent from R2 consists mainly of multi-branched high-octane number isomers and cycloalkanes.
  • FIG. 2 A further embodiment of the process is illustrated in Fig. 2.
  • the hydrocarbon feedstock is passed via line 1 to the isomerisation units R1 and R2.
  • the effluent from unit R2 is passed via line 3 to a separator S1.
  • the effluent from separator S1 containing linear paraffins is recycled to reactor R1.
  • the product stream 5 consists mainly of multi-branched isomers and cycloalkanes.
  • Fig. 3 The process sequence as described in Fig. 1 and Fig. 2 is also illustrated in Fig. 3.
  • the effluent from reactor R1 is passed via line 2 to the separation unit S1.
  • separation unit S1 linear paraffins are separated from mono-branched paraffins and are recycled back to R1.
  • the mono-branched paraffins are fed to reactor R2 for further isomerisation to multi-branched paraffins.
  • FIG. 4 Another embodiment of the process is illustrated in Fig. 4. Compared to the process in Fig. 3, this process comprises of an extra separator S2 after reactor R2.
  • the separation unit S2 separates mono-branched isomers from multi-branched isomers. The mono-branched isomers are recycled to reactor R2.
  • Still another embodiment is to transfer separator S1 behind reactor R2 with separator S2 present or not present or using a separator, which separates linear and mono-branched isomers in one step and recycles them into one of the reactors.
  • separation is accomplished in the liquid or gas phase using e.g. zeolite membranes, adsorption or distillation.
  • ZSM-5 membranes or PSA based on zeolite A can be successfully applied to remove linear molecules.
  • Adsorbents with larger pores have to be used to perform separation of multi-branched isomers and cyclic compounds by PSA.
  • the example of such adsorbent is a non-acidic form of the AFO molecular sieve. Moving bed or simulated moving bed can be economically more feasible with less efficient adsorbents like silicalite, since they allow larger amount of theoretical separation steps than PSA.
  • Zirconium oxide is prepared by adding diluted ammonia to a water solution of zirconyl nitrate and adjusting pH to 11. The mixture is refluxed for 4 days. The white solid is filtered and dried overnight at 120°C. 30 wt% of ammonium metatugstate is added to the zirconia support by incipient wetness impregnation and the sample is calcined for 3 hours at 750°C. 0.3% Pd is introduced to the catalyst by cation exchange and the catalyst is calcined at 350°C before being put into the reactor.
  • the feed used in the reaction is a C 7 cut consisting of 32 wt% cycloparaffins, 3 wt% toluene and 65% of heptanes.
  • the detail composition is shown in Table 1.
  • the detail feed and product compositions are shown in Table 1.
  • Feed and product compositions referring to the first reaction step Feed [wt%]
  • Product [wt%] Propane - 0.7 Isobutane - 0.9 Isopentane - - Isohexanes - - 2,2-dimethylpentane - 4.0 2,4-dimethylpentane 0.6 4.5 2,2,3-trimethylbutane - 0.5 3,3-dimethylpentane - 1.0 2-methylhexane 13.5 17.2 2,3-dimethylpentane 0.5 4.4 3-methylhexane 11.4 15.9 3-ethylpentane 1.2 1.1 n-heptane 37.6 15.5 Cycloheptanes 32.2 34.2 Toluene 3 - RON - calculated 49.5 64.8
  • the product is cooled down and hydrogen and light products are removed.
  • the feed is contacted with the liquid catalyst in a stirred autoclave at 0°C for 1 hour under inert atmosphere.
  • the catalyst is ionic liquid consisting of trimethylammonium hydrochloride and aluminium chloride in the ratio 1:2 to which 10 molar% of anhydrous CuCl 2 is added.
  • the volume ratio between the catalyst and the hydrocarbon phase is 1:1.
  • the feed and product composition is shown in Table 2.
  • the hydrocarbon fraction is easily separated from the liquid catalyst and sent to the caustic treatment to remove ppm levels of HCl.
  • Feed and product compositions referring to the second reaction step Feed [wt%]
  • Product [wt%] Propane - - Isobutane 0.1 0.2 Isopentane - - Isohexanes - - 2,2-dimethylpentane 4.0 4.1 2,4-dimethylpentane 4.5 11.0 2,2,3-trimethylbutane 0.5 1.2 3,3-dimethylpentane 1.0 1.1 2-methylhexane 17.4 16.1 2,3-dimethylpentane 4.5 5.0 3-methylhexane 16.1 10.3 3-ethylpentane 1.2 0.2 n-heptane 15.8 15.7 Cycloheptanes 34.9 34.8 Toluene - - C 7+ 0.3 RON-calculated 61.6 66.4
  • adsorbent APO-411
  • 5 ml of the feed (Table 3) is pumped into the adsorber, and when the mixture is equilibrated pressure increases to 2.2 bar.
  • 15 ml/min hydrogen flow is sent through the adsorber keeping the pressure at the constant level and the product is condensed and collected for the first 8 minutes.
  • the composition of the product is shown in Table 3.
  • the temperature in the reactor is increased to 250°C and desorbed hydrocarbon together with hydrogen are sent directly to the first reactor.
  • the adsorbent is cooled down and prepared for the next cycle.
  • the once-through yield is 22.9% the calculated research octane number of the product is 93.2 and the liquid (C 5+ ) yield of the whole process configuration is 93%.

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  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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EP03006545A 2002-04-18 2003-03-24 Procédé pour la production d'essence de haute qualité à faible teneur en aromatiques Withdrawn EP1357167A1 (fr)

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