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EP2076583A1 - Additif de stabilisation pour fioul - Google Patents

Additif de stabilisation pour fioul

Info

Publication number
EP2076583A1
EP2076583A1 EP07821841A EP07821841A EP2076583A1 EP 2076583 A1 EP2076583 A1 EP 2076583A1 EP 07821841 A EP07821841 A EP 07821841A EP 07821841 A EP07821841 A EP 07821841A EP 2076583 A1 EP2076583 A1 EP 2076583A1
Authority
EP
European Patent Office
Prior art keywords
tar
fuel oil
oxyl
composition according
residue
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.)
Withdrawn
Application number
EP07821841A
Other languages
German (de)
English (en)
Inventor
Andrea Zanotti
Milena Mantarro
Marco Buccolini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chimec SpA
Original Assignee
Chimec SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chimec SpA filed Critical Chimec SpA
Publication of EP2076583A1 publication Critical patent/EP2076583A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/22—Organic compounds containing nitrogen
    • C10L1/232—Organic compounds containing nitrogen containing nitrogen in a heterocyclic ring
    • 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
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/007—Visbreaking
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/22—Organic compounds containing nitrogen
    • C10L1/23—Organic compounds containing nitrogen containing at least one nitrogen-to-oxygen bond, e.g. nitro-compounds, nitrates, nitrites
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/16—Hydrocarbons
    • C10L1/1608—Well defined compounds, e.g. hexane, benzene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/18—Organic compounds containing oxygen
    • C10L1/182—Organic compounds containing oxygen containing hydroxy groups; Salts thereof
    • C10L1/1822—Organic compounds containing oxygen containing hydroxy groups; Salts thereof hydroxy group directly attached to (cyclo)aliphatic carbon atoms
    • C10L1/1824—Organic compounds containing oxygen containing hydroxy groups; Salts thereof hydroxy group directly attached to (cyclo)aliphatic carbon atoms mono-hydroxy
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/18—Organic compounds containing oxygen
    • C10L1/182—Organic compounds containing oxygen containing hydroxy groups; Salts thereof
    • C10L1/1822—Organic compounds containing oxygen containing hydroxy groups; Salts thereof hydroxy group directly attached to (cyclo)aliphatic carbon atoms
    • C10L1/1826—Organic compounds containing oxygen containing hydroxy groups; Salts thereof hydroxy group directly attached to (cyclo)aliphatic carbon atoms poly-hydroxy
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/10—Liquid carbonaceous fuels containing additives
    • C10L1/14—Organic compounds
    • C10L1/18—Organic compounds containing oxygen
    • C10L1/185—Ethers; Acetals; Ketals; Aldehydes; Ketones
    • C10L1/1852—Ethers; Acetals; Ketals; Orthoesters

Definitions

  • the present invention relates to additives for the stabilization of fuel oil, compositions containing them and use processes thereof, in particular in the stabilization of fuel oil exiting from Visbreaking (VSB) plants .
  • VSB Visbreaking
  • VLB State of the prior art Visbreaking
  • the conversion provides in part distilled products, such as gas, gasolines, kerosene, gas oil, and in part residue (hereinafter also referred to as tar or TAR) that can still constitute the basis for use as fuel oil.
  • the conversion process is conducted in such a manner as to maximize the yield of distilled products, while reducing the overall yield of tar oil. It should be noted that even a conversion increase equal to 1% of the feedstock is to be considered extremely satisfactory in terms of economic yield.
  • the VSB plant comprises the following parts: a heat exchanger bank through which the feedstock enters the VSB plant for pre-heating; a furnace in which the actual thermal cracking takes place; a fractionating column, from the top of which the distillates are extracted and from the bottom of which the residue (TAR) leaves.
  • This residue passes through heat exchangers, transferring part of its heat to the feedstock, and is then stored in tanks.
  • a soaker and a preflash column can be provided between the furnace and the fractionating column.
  • the VSB plant operative conditions may be briefly described as follows: a feedstock, consisting generally of a primary or vacuum distillation residue, is fed into the furnace, which operates at temperatures ranging from 420 0 C to 500 0 C and at pressures of between 3 bar and 20 bar.
  • the feedstock treated in this manner passes to the fractionating column, which operates using known procedures; from it there may be obtained, for example in the following proportions: light distillates (gas and gasolines, 3-10%) , medium distillates (kerosene and gas oil, 15-20%) and a residue (TAR, 65-75%) ; the percentages are by weight on the total products leaving the VSB plant .
  • the TAR present in a greater proportion (aliquot) than the other components, must conform to specifications set by the market, for example those indicated in Table 1, if it is to be used as fuel oil.
  • HFT Hot Filtration Test
  • scope of the present application is to offer novel advantageous solutions to the above-mentioned problems .
  • the present invention is based on the unexpected finding that compounds belonging to the class of stable free radicals are useful as additives able to stabilize fuel oil during storage and counteract the formation of insoluble compounds therein.
  • object of the present invention is a stabilizing composition, soluble in fuel oil, containing at least one compound belonging to the class of stable free radicals, preferably selected from nitroxides, dinitroxides, trinitroxides or mixtures thereof, and a solvent, or a mixture of solvents, able to stably maintain said compound in solution, in the temperature range between -10 0 C and +50 0 C.
  • the fuel oil is the residue or tar of a Visbreaking (VSB) thermal conversion process.
  • a second object of the invention is a method for stabilizing fuel oils, such as those at the basis of the residue (tar) of the Visbreaking (VSB) thermal conversion process, comprising a step in which the composition of the invention is added to the oil in an amount ranging from 1 to 2000 ppm with respect to the fuel oil, for example from 100 to 600 ppm with respect to the fuel oil.
  • a step in which the composition of the invention is added to the oil in an amount ranging from 1 to 2000 ppm with respect to the fuel oil, for example from 100 to 600 ppm with respect to the fuel oil.
  • a third object of the invention are the stabilized fuel oils obtained in accordance with the method of the invention .
  • thermal conversion process and plant for the production of petroleum distillation products such as plants for conducting Visbreaking processes, comprising a station for adding to the distillation residue (tar) stabilizing compositions according to the invention on the line between the column and the storage tank.
  • compositions of the invention afford to the distillation residue (tar) , and therefore to the fuel oil obtainable therefrom, surprising characteristics of storage stability, low viscosity, low solid-fraction content as demonstrated in detail in the experimental section of the application. These advantageous properties increase the intrinsic and commercial value of the product .
  • ком ⁇ онент for stabilizing additive, compound or composition it is meant an additive, compound or composition able to influence at least one of the parameters usually considered as indicative of the stability of the residue or tar of a petroleum thermal conversion process.
  • Such parameters are the HFT (Hot Filtration Test) , indicating the presence of sediments.
  • the parameter is determined by carrying out the ASTM D4870 method described in detail in the examples, and must not have a value higher than 0.30% w/w. Higher values denote levels outside commercial specifications for the solid fraction contained in oil and the oil viscosity.
  • a second parameter is the PV, indicating the stability of asphaltenes placed under flocculation condition. This parameter is calculated according to the SHELL method.
  • the stabilizing compositions of the invention comprise as essential component one or more stabilizing compounds able to counteract the increase in HFT value during storage. These pertain to the class of stable free radicals, and in particular to the class of nitroxides, dinitroxides, trinitroxides, preferably nitroxides or dinitroxides or mixtures thereof containing a free radical in their molecule.
  • the nitroxides of the invention are compounds having the following general formula (I) :
  • substituents R, R' , and R" represent a group selected from H; (C1-C15) alkyl, e.g. methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, ter-butyl, pentyl, hexyl; (C3-C15) cycloalkyl, e.g. cyclobutyl, cyclopentyl, cyclohexyl; (C5-C15) aryl, e.g. phenyl, benzyl, napthyl, or where two symmetrical substituents
  • [R] or [R'] or [R"] together form a cyclic core, all substituted or unsubstituted with heteroatoms like 0, N, S, P or halogens.
  • the compound belonging to the class of stable free radicals is a dinitroxide or a trinitroxide, or mixtures of all preceding compounds.
  • Examples of compounds useful in the present invention are : 4-hydroxy-l-oxyl-2, 2, 6, 6-tetramethylpiperidine (4OH TEMPO) ;
  • Preferred nitroxides or dinitroxides are:
  • TEMPO bis (l-oxyl-2, 2, 6, 6-tetramethylpiperidin - 4 yl) sebacate; 2,2,6,6 tetramethyl-piperidin-N-oxyl (TEMPO); l-oxyl-2, 2, 6, 6 tetramethyl-piperidin-4-one (OXO TEMPO);
  • Essential condition of the free radical compound is that it be soluble in the residue (tar) or in the fuel oil at the various operating temperatures to which the residue or the fuel oil are subjected during preparation or storage.
  • the compound should be soluble, preferably in the temperature range between 50 0 C and 300 0 C and in particular between 70 0 C and 110 0 C, storage temperature of the fuel oil.
  • the compounds of the invention are known to a person skilled in the art (see WO-A-00/36052) and all commercially accessible from Sigma Aldrich Corporation or A. H. Marks and Company Limited (UK) .
  • compositions subject-matter of the invention further comprise a solvent or a mixture of solvents suitable for solubilizing and stably maintaining in solution the free radical compound within a wide temperature range, i.e. of at least between -10 0 C and +50 0 C.
  • useful solvents are water, alcohols, glycols, glycol-ethers, aromatic solvents and mixtures thereof, such as: water, 2-butoxy-ethanol, iso-octyl alcohol, iso-butyl alcohol, isopropyl alcohol, methyl alcohol, toluene, ortho- meta- and para-xylene, ethylbenzene or mixtures thereof.
  • the compound belonging to the class of stable free radicals is present in the composition in any percentage amount suitable for reaching the desired stabilizing effect, e.g. of from 0.1% to 50% w/w of the composition.
  • the stabilizing method according to the invention provides the stabilizing composition to be added to the tar or fuel oils in an amount ranging from 1 to 2000 ppm with respect to the product to be stabilized. Advantageous results were obtained by using amounts ranging from 50 to 600 ppm.
  • composition addition is on the tar exiting the bottom of the VSB column on the line leading to the storage tank.
  • the stabilized product thus obtained be it tar or fuel oil, maintains the characteristic specifications set by the market and by provisions of the law as indicated in Table 1, with extremely reasonable additional costs. In actual fact, its combustion causes scarce formation of coke in the preheaters, scarce formation of soot and decreased gum-like sediments of paraffin nature on the lines of the combustion system.
  • the use of the stabilizing compositions of the invention has a positive impact on the running of the entire Visbreaking process.
  • another relevant advantage afforded by the invention is the option of increasing the conversion, by increasing the process severity, and therefore of improving the yield of high- value products, without anyhow losing in terms of quality of produced tar.
  • the increase in conversion attainable, e.g., through a temperature increase would be negatively balanced by a downgrading of the produced tar, if the latter were not stabilized with the compositions of the invention.
  • the advantage of a higher yield of valuable products would be nullified by the fact that the tar would not reach the envisaged specifications and therefore would not have the commercial value usually foreseen.
  • the implementation of the invention involves a modification of the known plants for conducting classic Visbreaking processes, introducing a station provided with suitable inletting devices, like a suitable detached section off the tar line, equipped with safety valves, a line dedicated to the product, an addition pump and a storage tank, allowing addition of the stabilizing composition directly to the tar exiting the VSB column on the line between the latter and the tar storage tank.
  • the Visbreaking method itself is advantageously modified with respect to its usual implementation, by providing the additional step of adding the stabilizing composition.
  • the invention is described in all experimental details in the following examples, which are by way of illustration and not for limitative purposes.
  • the HFT method envisages a hot filtration (100 0 C, held by means of a steam-heated thermostatic jacket) on GF/A Grade fiberglass filters, of an aliquot of the tar
  • composition A formulated as follows:
  • the blank used as reference is the same sample without stabilizing additive.
  • the samples, with and without additive, are placed in an oven or a thermostatic bath for 24 h at 100 0 C to simulate ageing (STD ASTM D 4870A procedure) .
  • the tar, a VSB residue, used in the tests (collected after having raised the FET of +3°C) has a PV value equal to 1.06 and a HFT value tel quel of less than 0.01%w/w. Under normal running conditions the PV value of the VSB tar is equal to 1.1. Such a PV value demonstrates that FET raising caused an increase in severity, thereby producing a less stable tar (lower PV) .
  • composition A was stabilized by addition of composition A at different dosages, to test its effectiveness towards the blank.
  • Sample ageing was performed according to the standard method, therefore at a 100 0 C temperature for 24 h.
  • the tar sample has a clear tendency to ageing, reaching an HFT value of about 0.2 w/w.
  • Use of the additive in a 300 ppm ratio contained 78% of the ageing of the sample, bringing it back to an HFT value of below 0.05% w/w.
  • the sample has an ageing tendency 47% greater than that detected by the STD procedure and is found to have an HFT outside the required specification (0.3% w/w).
  • Product A at the optimal dosage of 300 ppm, counteracts ageing for a 27% bringing the sample back inside the specification.
  • the sample collected after having raised the furnace exit temperature (FET) of 6°C, has a PV value equal to 1.01 and an HFT tel quel of ⁇ 0.01%w/w. Under normal running conditions, the PV value of the VSB TAR is equal to 1 . 1 .
  • the sample was additioned with Product A, at different dosages, to test its effectiveness towards the blank .
  • Composition A was also tested in a plant during a 3- month industrial trial.
  • the following concept namely that the VSB plant is operated with the aim of obtaining maximum transformation into medium and light distillates (high value-added products) . This aim is achieved by increasing the Furnace Exit Temperature
  • Table column “HFT96h (additive-treated)” indicates the value (%w/w) of sediment content in the sample collected after the addition of additive.
  • HFT24h (BLANK) indicates the value (%w/w) of sediment content on the sample collected before the addition of additive.
  • composition A used in the plant demonstrates an average efficiency of 28%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

La présente invention concerne des additifs destinés à stabiliser du fioul, des compositions contenant ces additifs et des procédés d'utilisation de ces additifs, en particulier dans la stabilisation d'unités de viscoréduction à sortie de fioul (VSB).
EP07821841A 2006-10-26 2007-10-25 Additif de stabilisation pour fioul Withdrawn EP2076583A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20060581 ITRM20060581A1 (it) 2006-10-26 2006-10-26 Additivo stabilizzante per olio combustibile
PCT/EP2007/061478 WO2008049887A1 (fr) 2006-10-26 2007-10-25 Additif de stabilisation pour fioul

Publications (1)

Publication Number Publication Date
EP2076583A1 true EP2076583A1 (fr) 2009-07-08

Family

ID=38924281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821841A Withdrawn EP2076583A1 (fr) 2006-10-26 2007-10-25 Additif de stabilisation pour fioul

Country Status (3)

Country Link
EP (1) EP2076583A1 (fr)
IT (1) ITRM20060581A1 (fr)
WO (1) WO2008049887A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0917345A2 (pt) * 2008-08-28 2015-11-17 Taminco composição, e, método para produzir uma composição estabilizada.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5460634A (en) * 1991-07-02 1995-10-24 Exxon Chemical Patents Inc. Fuel oil treatment
WO2000036052A1 (fr) * 1998-12-17 2000-06-22 Nalco/Exxon Energy Chemicals, L.P. Utilisation de melanges cynergiques contenant des stabiliseurs nitroxides pour inhiber la polymerisation de monomeres aromatiques vinyliques

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4670131A (en) * 1986-01-13 1987-06-02 Exxon Chemical Patents Inc. Method for controlling fouling of hydrocarbon compositions containing olefinic compounds
US5711767A (en) * 1996-07-11 1998-01-27 Ciba Specialty Chemicals Corporation Stabilizers for the prevention of gum formation in gasoline
IT1295412B1 (it) * 1997-10-06 1999-05-12 Chimec Spa Composizione d'additivo antiinvecchiamento per circuito di quench oil in un impianto di produzione di etilene e metodo di conduzione
IT1307306B1 (it) * 1999-12-24 2001-10-30 Chimec Spa Procedimento per impedire la formazione di fouling polimerico neltrattamento di cariche idrocarburiche contenenti olefine.
ITRM20020297A1 (it) * 2002-05-28 2003-11-28 Chimec Spa Additivo per olio combustibile.
KR20050117567A (ko) * 2003-03-31 2005-12-14 시바 스폐셜티 케미칼스 홀딩 인코포레이티드 디젤 연료 조성물 및 디젤 연료의 여과성을 향상시키는방법

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5460634A (en) * 1991-07-02 1995-10-24 Exxon Chemical Patents Inc. Fuel oil treatment
WO2000036052A1 (fr) * 1998-12-17 2000-06-22 Nalco/Exxon Energy Chemicals, L.P. Utilisation de melanges cynergiques contenant des stabiliseurs nitroxides pour inhiber la polymerisation de monomeres aromatiques vinyliques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008049887A1 *

Also Published As

Publication number Publication date
ITRM20060581A1 (it) 2008-04-27
WO2008049887A1 (fr) 2008-05-02

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