WO2003014265A1 - Procede d'isomerisation d'une coupe c5-c8 mettant en oeuvre deux reacteurs en parallele - Google Patents
Procede d'isomerisation d'une coupe c5-c8 mettant en oeuvre deux reacteurs en parallele Download PDFInfo
- Publication number
- WO2003014265A1 WO2003014265A1 PCT/FR2002/002385 FR0202385W WO03014265A1 WO 2003014265 A1 WO2003014265 A1 WO 2003014265A1 FR 0202385 W FR0202385 W FR 0202385W WO 03014265 A1 WO03014265 A1 WO 03014265A1
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- WO
- WIPO (PCT)
- Prior art keywords
- isomerization
- fraction
- paraffins
- effluents
- carbon atoms
- Prior art date
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Classifications
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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
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/14—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural parallel stages only
Definitions
- the present invention relates to an isomerization process in the presence of hydrogen (also sometimes called hydro-isomerization process), of a feed comprising mainly hydrocarbons containing from 5 to 8 carbon atoms per molecule.
- hydrogen also sometimes called hydro-isomerization process
- C5-C8 cut will be used to denote a charge comprising mainly normal paraffins containing from 5 to 8 carbon atoms per molecule.
- the current schemes for recovering naphtha (cut C5-C10) from atmospheric distillation most often include a fractionation producing: - a light naphtha (cut C5-C6) which is sent to isomerization,
- the product of the isomerization (or isomerate) is free of aromatics, unlike the reformate which generally contains a non-negligible amount (80% molar and more).
- Isomerate and reformate are usually sent to the gasoline pool in which other bases or additives can also intervene: gasoline from catalytic cracking in a fluidized bed (FCC), alkylation products, methyl-tert-butyl ether (MTBE), etc.
- - Friedel and Crafts type catalysts such as catalysts containing aluminum chloride, which are used at low temperatures (around 20 to 130 ° C), - catalysts based on metals from the NILI group of the periodic table elements (Handbook of Chemistry and Physics, 45th edition, 1964-1965) deposited on alumina and containing generally a halogen, which are used at moderate temperatures (about 110 to 160 ° C).
- the patents US 2,906,798, US 2,993,398, US 3,791,960, US 4,113,789, US 4,149.993, US 4,804,803 describe, for example, this type of catalyst, - zeolitic catalysts comprising a group VIII metal deposited on a zeolite, which are used at temperatures high (250 ° C.
- the current processes for isomerization of paraffins containing 5 and 6 carbon atoms using chlorinated alumina type catalysts and comprising platinum are high activity catalysts. These processes are used without recycling or with partial recycling after fractionation of the normal non-converted paraffins, for example on molecular sieve systems. These processes lead to the production of a base for fuels that do not contain aromatics and whose research octane number (in English Research Octane ⁇ umber: RO ⁇ .) Is generally between 82 and 88, depending on whether the process Isomerization of normal paraffins used may or may not include recycling.
- Patent application EP-A1-922747 proposes, to limit during the isomerization of a C5-C8 cut the cracking rate of paraffins containing at least 7 carbon atoms per molecule, the use of an associated acid catalyst at relatively mild operating conditions.
- This catalyst contains at least one halogen and at least one metal from the NUI group, the reaction being carried out at a temperature between 30 and 150 ° C.
- the present invention relates to a process for isomerizing a charge comprising hydrocarbons containing from 5 to 8 carbon atoms per molecule, in which said charge is separated into at least two fractions, a fraction A mainly comprising hydrocarbons containing 5 or 6 carbon atoms, and a fraction B mainly comprising hydrocarbons containing 7 or 8 carbon atoms, and in which said fractions A and B are then separately treated, under specific conditions, in separate isomerization reaction zones.
- said fractions contain at least 50% of said hydrocarbons, preferably at least 80% of said hydrocarbons and very preferably at least 95% of said hydrocarbons.
- said charge is itself a naphtha (C5-C10 + cut), said fractionation then leading to a fraction A (C5-C6) possibly also comprising C2-C4 hydrocarbons, a fraction B (C7-C8) and a heavy fraction C containing mainly the heaviest hydrocarbons in the initial naphtha cut, ie containing at least 8 carbon atoms.
- said reaction zones contain chemically different isomerization catalysts.
- the isomerizing activity of the catalyst treating fraction A is greater than L5 the isomerizing activity of the catalyst treating fraction B.
- said reaction zones contain catalysts of the same chemical nature and the reaction temperatures are different.
- the isomerization catalysts of the process according to the invention are typically included in the group consisting of: catalysts most often supported by an inorganic support,
- an oxide and containing at least one halogen and at least one metal from group Nm zeolitic catalysts, containing at least one metal from group NUI, Friedel and Crafts catalysts, acid or superacid catalysts of HPA type (heteropolyanions) on zirconia, WOx (tungsten oxides) on zirconia, sulfated zirconia.
- Said WOx catalysts (tungsten oxides) on zirconia are for example described in “Oxide Catalysts and Catalyst 5 Development, PHILLIPS M.J. and TER ⁇ A ⁇ M. eds” or in US Patent 5,422,327.
- catalysts of HPA type are for example described in “Heteropoly and Isopoly Oxometalates, Springer-Nerlag, M. Thor Pope, Berlin Heidelberg New York Tokyo 1983” or in French patent FR2795340.
- Other catalysts having an acidity comparable to that of the catalysts mentioned above can also be used, for example catalysts comprising at least one trioctahedral pillar mica and / or vermiculites.
- the total pressure in the isomerization zones is typically around 0.1 to 10 MPa relative, the hourly volume velocity being around 0.2 to 10 h -1 .
- Two embodiments of the invention can be considered, depending on the value of the excess hydrogen relative to the amount of hydrogen consumed by the hydrogenation and cracking reactions of the paraffins.
- At least one of the isomerization reactions can be carried out in the presence of an excess of hydrogen such that the ratio R of the number of moles of hydrogen to the number of moles of hydrocarbons leaving at least one reaction zone is between 0.06 and 0.3. In this case, it is not necessary to recycle the unconsumed hydrogen towards the inlet of the reactor. We then operate on “lost hydrogen”.
- At least one of the isomerization reactions is carried out in the presence of an excess of hydrogen such that the ratio R of the number of moles of hydrogen to the number of moles of hydrocarbons leaving at least less a reaction zone is between 0.3 and 30 and greater than 0.3.
- the excess hydrogen is recycled to the inlet of the reactor for example by means of a recycling compressor after separation of the cracked gases.
- the isomerates resulting from the isomerization of fractions A and B it is possible to mix the isomerates resulting from the isomerization of fractions A and B. It is also possible to separate said mixture into two effluents, the first of said effluents comprising the major part of isopentane and paraffins having at least two branches, the second of said effluents comprising the major part of normal paraffins and paraffins containing at least six carbon atoms and a single branch, said second effluent being recycled and mixed with the charge or with fraction B.
- the isomerate B resulting from the isomerization of fraction B is separated into two effluents, the first of said effluents comprising the major part of the isopentane and paraffins having at least two ramifications, the second of said effluents comprising the major part normal paraffins and paraffins containing at least six carbon atoms and a single branch. Said second effluent is optionally recycled, that is to say for example mixed with the feedstock or with fraction B.
- the first effluent will advantageously be mixed with the isomerate resulting from the isomerization of fraction A.
- fraction of isopentane and paraffins having at least two branches and / or the fraction of normal paraffins and paraffins containing at least six carbon atoms and a single branch contained in each of the effluents in each of the embodiments of the invention will obviously depend on the nature of the means of separation used.
- Said separation of said isomer (s) into two effluents will be carried out according to any technique or method known from the prior art, preferably by gas phase adsorption, on molecular sieve by PSA methods, that is to say known to those skilled in the art. under the Anglo-Saxon term “pressure swing adsorption” or by simulated counter-current.
- Said separation advantageously implement at least one zeolitic adsorbent whose structure type is included in the group consisting of, according to reference "Atlas of Zeolite Structure Types, Meier and DH Olson, 4 th edition (1996)", by the MFI (silicate, ZMS-5), FAU (zeolites X, Y, faujasite), MTT (ZSM-23, EU-13), EUO (Eul, ZSM-50, TPZ-3), NES (Nu 87, ssz-37), BEA (beta), MWW (MCM-22, ERB-1, ITQ-1), MEL (ZSM-11), FER (ferrierite), MTW (ZSM-12), AFI (SAPO-5) , ATO (SAPO-31), AEL (SAPO-11), ERI (erriobite), MOR (mordenite).
- MFI silicate, ZMS-5
- FAU zeolites X, Y, faujasite
- MTT ZSM-23
- Said zeolites may be exchanged with one or with a mixture of cations from columns IA and LIA of the periodic table. It is also possible according to the invention to separate the isomer A resulting from the isomerization of fraction A into two effluents, the first of said effluents comprising the major part of isopentane and paraffins having at least one branching, the second said effluents comprising the major part of normal paraffins, said second effluent being recycled and mixed with the feed or with fraction A. Finally, said first effluent from isomerate A and said first effluent from isomerate B will be advantageously mixed.
- Said separation of said isomer (s) resulting from the isomerization of fraction A into two effluents will be carried out according to any known technique, in particular by a distillation column of the deisohexanizer type, by adsorption in the gas phase on molecular sieve for example according to the methods described in US patents 5,233,120 or US 5,602,291. Said separation will advantageously use an adsorbent as described in US Patent 2,882,243.
- the isomerization reactor is supplied with a feed comprising hydrocarbons containing from 5 to 7 carbon atoms (C5-C7) with a flow rate of 87 g / h, said feed containing 800 ppm of perchlorethylene.
- the mass of catalyst present in the reactor is 86 g, the PPH of 1.01 h ⁇ 1 .
- the hydrogen flow rate is 4.5 l / h.
- the total pressure is 3 MPa relative.
- the isomerization is carried out at a temperature of 115 ° C. and the ratio R of the number of moles of hydrogen to the number of moles of hydrocarbons leaving the reactor is equal to 0.11 The results obtained are presented in Table 1.
- Example 2 (according to the invention) The same catalyst IS 612 A is used as in Example 1 in two separate isomerization reactors: reactor A for a synthetic feed mainly containing hydrocarbons containing 5 or 6 carbon atoms (feed C5 -C6) and reactor B for a synthetic feed containing mainly hydrocarbons containing 7 carbon atoms (feed C7).
- feed C5 -C6 a synthetic feed mainly containing hydrocarbons containing 5 or 6 carbon atoms
- feed C7 feed containing 7 carbon atoms
- the isomerization reactor A is supplied with feed C5-C6 with a flow rate of 20.21 g / h (gram per hour), said feed containing 800 ppm by weight of perchlorethylene (C 2 C1 4 ).
- the mass of catalyst present in reactor A is 20.01 g, the PPH (hourly volume speed) of 1.01 hr -1 .
- the hydrogen flow rate is 1.4 l / hr (liter per hour). the total pressure was 3 MPa relative.
- the isomerization reactor A is carried out at 140 ° C. This temperature optimizes the conversion of C5 and C6, approaching the thermodynamic equilibrium of the reaction.
- the isomerization reactor B is supplied with feed C7 with a flow rate of 66.79 g / h, said feed containing 800 ppm of perchlorethylene.
- the mass of catalyst present in reactor B is 66.13 g, the PPH of 1.01 h ⁇ 1 .
- the hydrogen flow rate is 3.2 l / h.
- the total pressure is 3 MPa relative.
- the temperature of the isomerization reaction in reactor B is set at 115 ° C.
- the ratio R ⁇ of the number of moles of hydrogen to the number of moles of hydrocarbon leaving reactor B is equal to 0.19.
- the compositions of isomers A and B respectively from reactors A and B and that of the mixture of these two isomers are given in table 3 below.
- Table 4 The results reported in Table 4 indicate that, under optimized operating conditions compared to Example 1 and for an identical initial charge, the isomerization scheme according to the present invention makes it possible to significantly improve the conversion to nC5 and nC6 while by retaining a conversion rate of normal-heptane and a yield of hydrocarbons comprising at least five carbon atoms (C5 +) which are substantially identical. The octane number of the isomerization products is therefore improved in the case of the present invention.
- Example 2 two different reactors are used but catalysts of a different chemical nature: an acid catalyst (IS 612 A) having a high activity for reactor A and a zeolitic catalyst type Pt / H-beta minus acidic but more selective for the isomerization of nC7.
- Said zeolite is marketed by the company Zeolyst and corresponds to the beta zeolite in its proton form.
- the initial charges are similar to those given in Example 2 (Table 2).
- the isomerization reactor A is supplied with feed C5-C6 at a rate of 20.21 g / h, said feed containing 800 ppm by weight of perchlorethylene (C 2 C1 4 ).
- the mass of catalyst present in reactor A is 20.01 g, the PPH is 1.01 h ⁇ 1 .
- the hydrogen flow rate is 1.4 l / h.
- the total pressure is 3 MPa relative.
- Isomerization reactor A operates at 140 ° C.
- the ratio R A of the number of moles of hydrogen to the number of moles of hydrocarbon leaving reactor A is equal to 0.19.
- the isomerization reactor B is supplied with feed C7 at a flow rate of 66.79 g / h.
- the mass of catalyst present in reactor B is 22.26 g, the PPH is 3 h ⁇ 1 .
- the hydrogen flow rate is 33.45 l / h.
- the total pressure is 3 MPa relative.
- the reactor Isomerization B operates at 240 ° C. so as to optimize the yield of iso-paraffins
- the ratio R B of the number of moles of hydrogen to the number of moles of hydrocarbon at the outlet of reactor B is equal to 1.86. The results obtained are reported in Table 5.
- This embodiment of the invention also appears more favorable than the example according to the prior art. Indeed, for a comparable nC7 hydrocarbon conversion, the conversion nC5 and nC6 hydrocarbons is notably increased as well as the yield of C5 +.
- the present process therefore makes it possible to improve the octane numbers of the isomers, on the one hand by increasing the conversion rates of hydrocarbons containing 5 to 6 carbon atoms, while minimizing the cracking rate of hydrocarbons containing 7 carbon atoms .
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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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/486,179 US7429685B2 (en) | 2001-08-06 | 2002-07-08 | Method for the isomerisation of a C5-C8 fraction involving two parallel reactors |
DE60239808T DE60239808D1 (de) | 2001-08-06 | 2002-07-08 | Verfahren zur isomerisierung von c5-c8 kohlenwasserstofffreaktionen mit zwei parallelreaktoren |
EP02767555A EP1417283B1 (fr) | 2001-08-06 | 2002-07-08 | Procede d'isomerisation d'une coupe c5-c8 mettant en oeuvre deux reacteurs en parallele |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/10566 | 2001-08-06 | ||
FR0110566A FR2828205B1 (fr) | 2001-08-06 | 2001-08-06 | Procede d'isomerisation d'une coupe c5-c8 mettant en oeuvre deux reacteurs en parallele |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003014265A1 true WO2003014265A1 (fr) | 2003-02-20 |
Family
ID=8866361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/002385 WO2003014265A1 (fr) | 2001-08-06 | 2002-07-08 | Procede d'isomerisation d'une coupe c5-c8 mettant en oeuvre deux reacteurs en parallele |
Country Status (5)
Country | Link |
---|---|
US (1) | US7429685B2 (fr) |
EP (1) | EP1417283B1 (fr) |
DE (1) | DE60239808D1 (fr) |
FR (1) | FR2828205B1 (fr) |
WO (1) | WO2003014265A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2857371B1 (fr) | 2003-07-11 | 2007-08-24 | Inst Francais Du Petrole | Procede ameliore d'isomerisation d'une coupe c7 avec ouverture des cycles naphteniques |
JP4861838B2 (ja) * | 2007-01-15 | 2012-01-25 | Jx日鉱日石エネルギー株式会社 | 液体燃料の製造方法 |
CN105038844A (zh) * | 2007-01-15 | 2015-11-11 | 吉坤日矿日石能源株式会社 | 液体燃料的制造方法 |
KR100964227B1 (ko) * | 2008-05-06 | 2010-06-17 | 삼성모바일디스플레이주식회사 | 평판 표시 장치용 박막 트랜지스터 어레이 기판, 이를포함하는 유기 발광 표시 장치, 및 이들의 제조 방법 |
US8808534B2 (en) * | 2011-07-27 | 2014-08-19 | Saudi Arabian Oil Company | Process development by parallel operation of paraffin isomerization unit with reformer |
FR3020374B1 (fr) * | 2014-04-29 | 2017-10-27 | Axens | Procede de production d'essence comprenant une etape d'isomerisation suivie d'au moins deux etapes de separation. |
US20160311732A1 (en) * | 2015-04-27 | 2016-10-27 | Uop Llc | Processes and apparatuses for isomerizing hydrocarbons |
US10106476B1 (en) * | 2017-03-31 | 2018-10-23 | David Norbert Kockler | Energy efficient methods for isomerization of a C5-C7 fraction with dividing wall fractional distillation |
FR3068966B1 (fr) * | 2017-07-12 | 2019-06-28 | IFP Energies Nouvelles | Nouveau schema de production de benzene a partir de reformat sans colonne de toluene |
US10118875B1 (en) * | 2017-09-13 | 2018-11-06 | David Norbert Kockler | Energy efficient methods for isomerization of a C5-C6 fraction with dividing wall fractional distillation |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2944959A (en) * | 1958-02-26 | 1960-07-12 | Gulf Research Development Co | Process for upgrading a wide range gasoline |
US3619408A (en) * | 1969-09-19 | 1971-11-09 | Phillips Petroleum Co | Hydroisomerization of motor fuel stocks |
EP0256604A2 (fr) * | 1986-08-14 | 1988-02-24 | Shell Internationale Researchmaatschappij B.V. | Procédé pour l'isomérisation d'hydrocarbures non-ramifiés |
US5994607A (en) * | 1996-02-05 | 1999-11-30 | Institut Francais Du Petrole | Paraffin isomerization process comprising fractionation having at least two draw-off levels associated with at least two isomerization zones |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2399765A (en) * | 1943-09-18 | 1946-05-07 | Standard Oil Co | Isomerization of light naphtha paraffinic hydrocarbons |
US2434437A (en) * | 1944-03-15 | 1948-01-13 | Shell Dev | Process for isomerization of paraffin hydrocarbons with fluid friedel-crafts catalyst and added dicyclic naphthenic hydrocarbons |
-
2001
- 2001-08-06 FR FR0110566A patent/FR2828205B1/fr not_active Expired - Fee Related
-
2002
- 2002-07-08 WO PCT/FR2002/002385 patent/WO2003014265A1/fr not_active Application Discontinuation
- 2002-07-08 EP EP02767555A patent/EP1417283B1/fr not_active Expired - Lifetime
- 2002-07-08 US US10/486,179 patent/US7429685B2/en not_active Expired - Fee Related
- 2002-07-08 DE DE60239808T patent/DE60239808D1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2944959A (en) * | 1958-02-26 | 1960-07-12 | Gulf Research Development Co | Process for upgrading a wide range gasoline |
US3619408A (en) * | 1969-09-19 | 1971-11-09 | Phillips Petroleum Co | Hydroisomerization of motor fuel stocks |
EP0256604A2 (fr) * | 1986-08-14 | 1988-02-24 | Shell Internationale Researchmaatschappij B.V. | Procédé pour l'isomérisation d'hydrocarbures non-ramifiés |
US5994607A (en) * | 1996-02-05 | 1999-11-30 | Institut Francais Du Petrole | Paraffin isomerization process comprising fractionation having at least two draw-off levels associated with at least two isomerization zones |
Non-Patent Citations (1)
Title |
---|
YA.M. PAUSHKIN: "The chemical composition and properties of fuels for jet propulsio", 1962, PERGAMON PRESS, OXFORD, GB, XP002192480 * |
Also Published As
Publication number | Publication date |
---|---|
FR2828205B1 (fr) | 2004-07-30 |
DE60239808D1 (de) | 2011-06-01 |
US20040254415A1 (en) | 2004-12-16 |
FR2828205A1 (fr) | 2003-02-07 |
EP1417283A1 (fr) | 2004-05-12 |
US7429685B2 (en) | 2008-09-30 |
EP1417283B1 (fr) | 2011-04-20 |
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