EP1212390B1 - Hydrocarbon base oil for lubricants with a very high viscosity index - Google Patents
Hydrocarbon base oil for lubricants with a very high viscosity index Download PDFInfo
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- EP1212390B1 EP1212390B1 EP00960815A EP00960815A EP1212390B1 EP 1212390 B1 EP1212390 B1 EP 1212390B1 EP 00960815 A EP00960815 A EP 00960815A EP 00960815 A EP00960815 A EP 00960815A EP 1212390 B1 EP1212390 B1 EP 1212390B1
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- Prior art keywords
- base oil
- oil according
- viscosity index
- carbon atoms
- equal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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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
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/10—Lubricating oil
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
Definitions
- the invention relates to a hydrocarbon base oil for high-end lubricants, obtained from hydrocarbon cuts from various sources. More specifically, the invention relates to an oil of this type, having a viscosity index VI, calculated according to standard NF T 60-136, greater than 130, for a kinematic viscosity measured at 100 ° C (Vk @ 100 ° C) , measured according to standard NF T 60-100, between 3.5 and 4.5 mm 2 / s (or cSt).
- This base oil finds a preferential application in the formulations of lubricants for engines, in particular in the automobile industry, as well as for industrial uses.
- Base oils are currently classified according to the API classification into five groups, according to characteristics defined in Table 1 below: Table 1 Saturated compounds (% by weight) Sulfur content (% by weight) Viscosity index VI Group 1 ⁇ 90 > 0.03 80 ⁇ VI ⁇ 120 Group II > 90 ⁇ 0.03 80 ⁇ VI ⁇ 120 Group III > 90 ⁇ 0.03 > 120 Group IV PAO (Poly- ⁇ -olefins) Group V Others (esters)
- viscosity index or VI of petroleum products is calculated from their kinematic viscosities at 40 ° C and 100 ° C, according to standard NF T 60-136.
- Such bases obtained from hydrocracking residues subjected to a dewaxing with solvent and forming part of group III according to the API classification described above, are currently produced, in particular by the Applicant, under the name NHC5 (“Neutral HydroCracked ”), with a Vk @ 100 ° C of 4.5 to 5 mm 2 / s (4.5 to 5 cSt).
- Patent application FR 2 194 767 A describes, in particular, a process for preparing a high VI lubricating oil, comprising a catalytic hydrocracking treatment of a mineral fraction with high boiling point, a effluent fractionation, dewaxing of the boiling residue above 350 ° C. and catalytic hydroisomerization of the paraffin obtained.
- EP-A-0 323 092 describes a process for producing high VI oil, comprising steps of hydrotreatment, catalytic hydroisomerization and dewaxing
- WO 97/21788 A describes a process for producing a biodegradable lubricating base oil, comprising a step of hydroisomerization and catalytic hydrocracking of a fraction of boiling point above 370 ° C.
- the object of the present invention is therefore to obtain a new base oil for high-end lubricants, obtained from hydrocarbon cuts from various sources, having a high viscosity index and improved cold properties, in particular a pour point below -18 ° C, ensuring satisfactory rheological properties to the finished lubricating oils formulated from this base oil, in a wide range of temperatures (from -30 to + 100 ° C), thanks to a particular branching structure of the paraffinic molecules composing it.
- the base oil according to the invention is much better in performance than bases currently available on the market, derived from hydrocracked products and having undergone solvent dewaxing (oils of the NHC5 type), or dewaxing catalytic, and which belong to group III according to the API classification described above.
- it can also replace known synthetic bases such as poly- ⁇ -olefins (PAO), belonging to group IV, whose performances are well known for increasing the VI, but which have the major drawback of have a cost much higher than the bases of mineral origin.
- PAO poly- ⁇ -olefins
- the subject of the invention is a hydrocarbon base oil for lubricants, having a viscosity index VI greater than or equal to 130, comprising mainly long, isoparaffinic hydrocarbon chains, comprising a number of carbon atoms greater than 25 and branched on several carbon atoms, characterized in that the hydrocarbon chains have a ratio of the number of substituents composed of at least two carbon atoms to the number of methyl substituents greater than or equal to 0.9, and in that these chains have a ratio of the number of substituents composed of at least two carbon atoms, to the number of CH 2 long chain groups, greater than or equal to 0.23.
- the base oil according to the invention has a ratio of the viscosity index when cold (VIF) to the viscosity index (VI) (measured according to standard NF T 60-136) greater than or equal at 1.
- the base oil has a content of naphthenic molecules less than or equal to 0.1.
- the base oil has a Noack volatility value of less than 13% by weight (calculated according to standard CEC-L-40-A 95), as well as a pour point (calculated according to standard NFT 60- 105) below -18 ° C.
- it has a Saybolt color value of + 30 (measured according to the ASTM D 156 method).
- the base oil has a cold viscosity index (VIF) greater than 125.
- the base oil has a dynamic CCS viscosity at -30 ° C of less than 1200 mPa.s (calculated according to standard ASTM D 5293), for a kinematic viscosity Vk at 100 ° C of 4 mm 2 / s.
- the base oil according to the invention has a viscosity index VI greater than 130 and less than or equal to 135, for a kinematic viscosity Vk at 100 ° C of between 3.5 and 4.5 mm 2 / s or cSt.
- this base oil has a viscosity index VI greater than 135 for a kinematic viscosity Vk at 100 ° C of between 4.5 and 5 mm 2 / s.
- a second object of the invention relates to the use of the base oil defined above, in the formulation of lubricants for engines, in particular for automobiles, with a view in particular to formulating an OW30 grade.
- a third subject of the invention relates to a process for the preparation of the base oil of the invention successively comprising the stages of hydrotreatment, hydrodewaxing, fractionation and hydrofinishing of residue cuts from hydrocracking.
- the new base oil exhibits advantageous properties when cold, characterized, on the one hand, by a pour point of less than - 18 ° C and, on the other hand , by a new so-called cold viscosity index (VIF) such that the oil has a cold viscosity index (VIF) / viscosity index (VI) ratio, greater than or equal to 1.
- the cold viscosity index VIF is calculated in using the usual formula for calculating the VI (according to standard NF T 60-136), which integrates the values of kinematic viscosity at 100 ° C and 40 ° C of the product to be measured, but by replacing the value of kinematic viscosity with 40 ° C, the kinematic viscosity value at -30 ° C. The latter is obtained by dividing the dynamic viscosity at - 30 ° C (which is measurable) by the density at - 30 ° C of the product, calculated from the density at 15 ° C, by temperature correction.
- All these oils have a kinematic viscosity Vk @ 100 ° C of between 4 and 5 mm 2 / s (4 and 5 cSt).
- Mass spectrometry made it possible to evaluate the content of naphthenic molecules in the various base oils: there are approximately 10% for oil A, as well as for oil B, against 30% for oil C, 40% for oil D and 60% for oil E.
- fillers can advantageously be used, in mixture with the previous fillers, for doping them, in particular paraffins or Fischer-Tropsch synthetic waxes, waxes or slack waxes, and distillates for atmospheric or vacuum distillation.
- the lubricating base oil according to the invention by oligomerization of olefins, in particular of light alpha-olefins present in particular in the heavy petrol of visbreaking units or in l essence of FCC (cracker catalytic).
- This oligomerization is carried out in the presence of a catalyst of the phosphoric acid or aluminum chloride type, at temperatures between approximately 190 ° C. and 340 ° C. and it leads to hydrocarbon products with very branched long chains.
- the base oils thus obtained having a VI greater than 130 and a VIF greater than 125, can replace synthetic lubricating bases of the PAO type, with an advantageous economic advantage, in formulations for oils for automobile engines and in particular in grades such as OW30, for which the requirements of cold properties are the most severe: kinematic viscosity Vk @ 100 ° C between 9.3 and 12.5 mm 2 / s and dynamic viscosity CCS at -30 ° C less than 3250 mPa.s.
Abstract
Description
L'invention concerne une huile de base hydrocarbonée pour lubrifiants de haut de gamme, obtenue à partir de coupes hydrocarbonées de provenances diverses. Plus précisément, l'invention concerne une huile de ce type, ayant un indice de viscosité VI, calculé selon la norme NF T 60-136, supérieur à 130, pour une viscosité cinématique mesurée à 100°C (Vk@100 °C), mesurée selon la norme NF T 60-100, comprise entre 3,5 et 4,5 mm2/s (ou cSt). Cette huile de base trouve une application préférentielle dans les formulations de lubrifiants pour moteurs, notamment dans l'industrie automobile, ainsi que pour des usages industriels.The invention relates to a hydrocarbon base oil for high-end lubricants, obtained from hydrocarbon cuts from various sources. More specifically, the invention relates to an oil of this type, having a viscosity index VI, calculated according to standard NF T 60-136, greater than 130, for a kinematic viscosity measured at 100 ° C (Vk @ 100 ° C) , measured according to standard NF T 60-100, between 3.5 and 4.5 mm 2 / s (or cSt). This base oil finds a preferential application in the formulations of lubricants for engines, in particular in the automobile industry, as well as for industrial uses.
Les huiles de base sont actuellement classées selon la classification API en cinq groupes, en fonction de caractéristiques définies dans le Tableau 1 suivant :
Il est connu depuis longtemps de produire les huiles de base pour lubrifiants du groupe I à partir de certaines coupes de distillats obtenues par distillation sous vide de pétroles bruts paraffiniques, car c'est la teneur élevée en isoparaffines de ces bruts qui leur donne de bonnes valeurs de VI. Ces distillats subissent une extraction par solvant, produisant un raffinat riche en paraffines et un extrait riche en aromatiques ; le raffinat est ensuite déparaffiné par mélange avec un solvant organique (par exemple, la méthyléthylcétone ou MEC), refroidissement et filtration, de façon à obtenir par séparation des paraffines solides ou gatsch (élimination dès n-paraffines) et une huile ayant un VI d'au moins 95 et de bonnes propriétés à froid (point d'écoulement) ; cette huile subit enfin une hydrofinition pour la stabiliser et améliorer sa couleur.It has long been known to produce base oils for group I lubricants from certain cuts of distillates obtained by vacuum distillation of crude paraffinic oils, because it is the high isoparaffin content of these crudes which gives them good values of VI. These distillates are extracted by solvent, producing a raffinate rich in paraffins and an extract rich in aromatics; the raffinate is then dewaxed by mixing with an organic solvent (for example, methyl ethyl ketone or MEC), cooling and filtration, so as to obtain, by separation, solid or slack wax (elimination from n-paraffins) and an oil having a VI d '' at least 95 and good cold properties (point flow); this oil is finally hydrofinished to stabilize it and improve its color.
On rappelle que le calcul de l'indice de viscosité ou VI des produits pétroliers est effectué à partir de leurs viscosités cinématiques à 40°C et à 100°C, selon la norme NF T 60-136.Remember that the viscosity index or VI of petroleum products is calculated from their kinematic viscosities at 40 ° C and 100 ° C, according to standard NF T 60-136.
Cependant, depuis plusieurs années, les conditions de fonctionnement de plus en plus sévères des moteurs d'automobiles ont entraîné des spécifications plus contraignantes pour les huiles de base à partir desquelles sont formulées les huiles moteur, notamment une diminution de leur volatilité et de leur point d'écoulement et une augmentation de leur VI (au-dessus de 105). Or de telles caractéristiques ne peuvent pas toujours être obtenues seulement par extraction au solvant des coupes de distillation (« straight run »), d'où le développement de procédés de production d'huiles à partir d'autres coupes, telles que celles issues d'hydrocraquage catalytique et/ou d'hydrodéparaffînage catalytique. En effet, au cours de la réaction d'hydrocraquage des charges hydrocarbonées, se produisent principalement la saturation des composés aromatiques et la décyclisation des naphtènes, tandis que la réaction d'hydrodéparaffinage provoque le craquage et l'isomérisation des n-paraffines et améliore les propriétés à froid des bases lubrifiantes obtenues.However, for several years, the increasingly severe operating conditions of automobile engines have led to more stringent specifications for the base oils from which engine oils are formulated, in particular a reduction in their volatility and in their point flow and an increase in their VI (above 105). However, such characteristics cannot always be obtained only by solvent extraction of distillation cuts (“straight run”), hence the development of processes for producing oils from other cuts, such as those obtained from 'catalytic hydrocracking and / or catalytic hydrodewaxing. In fact, during the hydrocracking reaction of the hydrocarbon feedstocks, mainly the saturation of the aromatic compounds and the decyclization of the naphthenes occur, while the hydrodewaxing reaction causes the cracking and isomerization of the n-paraffins and improves the cold properties of the lubricant bases obtained.
De telles bases, obtenues à partir de résidus d'hydrocraquage soumis à un déparaffinage au solvant et faisant partie du groupe III selon la classification API décrite ci-dessus, sont actuellement produites, notamment par la Demanderesse, sous l'appellation NHC5 (« Neutral HydroCracked »), avec une Vk@100 °C de 4,5 à 5 mm2/s (4,5 à 5 cSt).Such bases, obtained from hydrocracking residues subjected to a dewaxing with solvent and forming part of group III according to the API classification described above, are currently produced, in particular by the Applicant, under the name NHC5 (“Neutral HydroCracked ”), with a Vk @ 100 ° C of 4.5 to 5 mm 2 / s (4.5 to 5 cSt).
Il est déjà connu de l'homme du métier de produire des huiles de base lubrifiantes ayant un indice de viscosité (VI) élevé, par exemple supérieur à 125, à partir de charges hydrocarbonées provenant des fractions lourdes ou résidus d'un hydrocraqueur. La demande de brevet FR 2 194 767 A décrit, en particulier, un procédé de préparation d'une huile lubrifiante à VI élevé, comprenant un traitement d'hydrocraquage catalytique d'une fraction d'huile minérale à haut point d'ébullition, un fractionnement des effluents, un déparaffinage du résidu bouillant au-dessus de 350 °C et une hydroisomérisation catalytique de la paraffine obtenue.It is already known to those skilled in the art to produce lubricating base oils having a high viscosity index (VI), for example greater than 125, from hydrocarbon feedstocks originating from heavy fractions or residues of a hydrocracker. Patent application FR 2 194 767 A describes, in particular, a process for preparing a high VI lubricating oil, comprising a catalytic hydrocracking treatment of a mineral fraction with high boiling point, a effluent fractionation, dewaxing of the boiling residue above 350 ° C. and catalytic hydroisomerization of the paraffin obtained.
L'association d'étapes d'hydrocraquage et d'isomérisation avec des catalyseurs spécifiques, pour la fabrication de lubrifiants à VI élevé, est également décrite dans EP 0 574 191 A et EP 0 597 935 A. C'est également le cas de EP 0 744 452 A, qui décrit un procédé de production de telles huiles de base, comprenant une étape d'hydrocraquage avec un catalyseur à base de platine et/ou de palladium d'une fraction de fond d'hydrocraqueur, de façon à convertir au moins 25 % en poids de la fraction d'hydrocarbures ayant un point d'ébullition d'au moins 370°C, suivie d'une étape de fractionnement des effluents, la fraction lourde ayant un VI d'au moins 125 et de préférence supérieur à 135, avec une viscosité cinématique à 100°C d'au moins 3,5 mm2/s ou cSt, la fraction lourde subissant ensuite une étape de déparaffinage. Cependant, ces brevets ou demandes publiées ne donnent pas de précisions sur les propriétés à froid des bases lubrifiantes obtenues, telles que leur point d'écoulement, ni sur leur structure .The association of hydrocracking and isomerization stages with specific catalysts, for the manufacture of high VI lubricants, is also described in EP 0 574 191 A and EP 0 597 935 A. This is also the case for EP 0 744 452 A, which describes a process for the production of such base oils, comprising a step of hydrocracking with a catalyst based on platinum and / or palladium of a hydrocracker background fraction, so as to convert at least 25% by weight of the hydrocarbon fraction having a boiling point of at least 370 ° C., followed by an effluent fractionation step, the heavy fraction having an VI of at least 125 and preferably greater than 135, with a kinematic viscosity at 100 ° C of at least 3.5 mm 2 / s or cSt, the heavy fraction then undergoing a dewaxing step. However, these patents or published applications do not give any details on the cold properties of the lubricant bases obtained, such as their pour point, nor on their structure.
Une autre voie connue pour obtenir des huiles de base à haut VI consiste à partir de charges hydrocarbonées très paraffiniques, en particulier composées de n-paraffines ou cires obtenues par synthèse Fischer-Tropsch ou de gatsch. C'est ainsi, notamment, que EP-A-0 323 092 décrit un procédé de production d'huile à haut VI, comprenant des étapes d'hydrotraitement, d'hydroisomérisation catalytique et de déparaffinage, et que WO 97/21788 A décrit un procédé de production d'huile de base lubrifiante biodégradable, comprenant une étape d'hydroisomérisation et d'hydrocraquage catalytique d'une fraction de point d'ébullition supérieur à 370°C d'une charge de paraffines de Fischer-Tropsch, une étape de fractionnement de l'effluent obtenu, dont la fraction lourde contient des paraffines ramifiées par des radicaux méthyl, et enfin une étape de déparaffinage au solvant. Si cette dernière demande décrit un taux de ramification par molécule compris entre 6 et 7,5 groupes méthyl pour 100 atomes de carbone, il est précisé qu'il y a très peu de ramifications par des groupes à 2 atomes de carbone (éthyl) ou plus.Another known route for obtaining high VI base oils consists in using highly paraffinic hydrocarbon charges, in particular composed of n-paraffins or waxes obtained by Fischer-Tropsch synthesis or slack wax. Thus, in particular, that EP-A-0 323 092 describes a process for producing high VI oil, comprising steps of hydrotreatment, catalytic hydroisomerization and dewaxing, and that WO 97/21788 A describes a process for producing a biodegradable lubricating base oil, comprising a step of hydroisomerization and catalytic hydrocracking of a fraction of boiling point above 370 ° C. of a charge of Fischer-Tropsch paraffins, a step fractionation of the effluent obtained, the heavy fraction of which contains paraffins branched by methyl radicals, and finally a dewaxing step with solvent. If the latter application describes a branching rate per molecule of between 6 and 7.5 methyl groups per 100 carbon atoms, it is specified that there are very few branches by groups with 2 carbon atoms (ethyl) or more.
Or la Demanderesse a établi, de manière surprenante, que la qualité de ces huiles est liée à la nature isoparaffinique des chaînes hydrocarbonées des coupes utilisées et, en particulier, à un rapport spécifique entre les différents types de substituants portés par ces chaînes.However, the Applicant has established, surprisingly, that the quality of these oils is linked to the isoparaffinic nature of the hydrocarbon chains of the cuts used and, in particular, to a specific relationship between the different types of substituents carried by these chains.
Le but de la présente invention est donc l'obtention d'une nouvelle huile de base pour lubrifiants de haut de gamme, obtenue à partir de coupes hydrocarbonées de provenances diverses, présentant un indice de viscosité élevé et des propriétés à froid améliorées, en particulier un point d'écoulement inférieur à -18 °C, assurant des propriétés rhéologiques satisfaisantes aux huiles lubrifiantes finies formulées à partir de cette huile de base, dans une large gamme de températures (de -30 à + 100 °C), grâce à une structure particulière de ramification des molécules paraffiniques composant celle-ci.The object of the present invention is therefore to obtain a new base oil for high-end lubricants, obtained from hydrocarbon cuts from various sources, having a high viscosity index and improved cold properties, in particular a pour point below -18 ° C, ensuring satisfactory rheological properties to the finished lubricating oils formulated from this base oil, in a wide range of temperatures (from -30 to + 100 ° C), thanks to a particular branching structure of the paraffinic molecules composing it.
Il a été constaté notamment que l'huile de base selon l'invention est très supérieure en performance à des bases disponibles actuellement sur le marché, issues de produits hydrocraqués et ayant subi un déparaffinage au solvant (huiles du type NHC5), ou un déparaffinage catalytique, et qui font partie du groupe III selon la classification API décrite ci-dessus. De façon surprenante, elle peut aussi remplacer des bases synthétiques connues comme les poly-α-oléfines (PAO), appartenant au groupe IV, dont les performances sont bien connues pour l'augmentation du VI, mais qui présentent l'inconvénient majeur d'avoir un coût très supérieur aux bases d'origine minérale.It has been observed in particular that the base oil according to the invention is much better in performance than bases currently available on the market, derived from hydrocracked products and having undergone solvent dewaxing (oils of the NHC5 type), or dewaxing catalytic, and which belong to group III according to the API classification described above. Surprisingly, it can also replace known synthetic bases such as poly-α-olefins (PAO), belonging to group IV, whose performances are well known for increasing the VI, but which have the major drawback of have a cost much higher than the bases of mineral origin.
A cet effet, l'invention a pour objet une huile de base hydrocarbonée pour lubrifiants, ayant un indice de viscosité VI supérieur ou égal à 130, comprenant principalement des chaînes hydrocarbonées longues, isoparaffiniques, comprenant un nombre d'atomes de carbone supérieur à 25 et ramifiées sur plusieurs atomes de carbone, caractérisée en ce que les chaînes hydrocarbonées présentent un rapport du nombre de substituants composés d'au moins deux atomes de carbone au nombre de substituants méthyl supérieur ou égal à 0,9, et en ce que ces chaînes présentent un rapport du nombre de substituants composés d'au moins deux atomes de carbone, au nombre de groupes CH2 de chaîne longue, supérieur ou égal à 0,23.To this end, the subject of the invention is a hydrocarbon base oil for lubricants, having a viscosity index VI greater than or equal to 130, comprising mainly long, isoparaffinic hydrocarbon chains, comprising a number of carbon atoms greater than 25 and branched on several carbon atoms, characterized in that the hydrocarbon chains have a ratio of the number of substituents composed of at least two carbon atoms to the number of methyl substituents greater than or equal to 0.9, and in that these chains have a ratio of the number of substituents composed of at least two carbon atoms, to the number of CH 2 long chain groups, greater than or equal to 0.23.
On a établi, en effet, que, pour une huile de base, lorsque la valeur des deux rapports qui viennent d'être définis est inférieure, respectivement, à 0,9 et à 0,23, les caractéristiques des huiles lubrifiantes finies obtenues à partir de cette base sont moins performantes.It has been established, in fact, that for a base oil, when the value of the two ratios which have just been defined is less than 0.9 and 0.23 respectively, the characteristics of the finished lubricating oils obtained at from this base are less efficient.
En particulier, l'huile de base conforme à l'invention présente un rapport de l'indice de viscosité à froid (VIF) à l'indice de viscosité (VI) (mesuré selon la norme NF T 60-136) supérieur ou égal à 1.In particular, the base oil according to the invention has a ratio of the viscosity index when cold (VIF) to the viscosity index (VI) (measured according to standard NF T 60-136) greater than or equal at 1.
De façon avantageuse, l'huile de base possède une teneur en molécules naphténiques inférieure ou égale à 0,1.Advantageously, the base oil has a content of naphthenic molecules less than or equal to 0.1.
Notamment, l'huile de base présente une valeur de volatilité Noack inférieure à 13 % en poids (calculée selon la norme CEC-L-40-A 95), ainsi qu'un point d'écoulement (calculé selon la norme NFT 60-105) inférieur à -18°C. En outre, elle possède une valeur de couleur Saybolt de + 30 (mesurée selon la méthode ASTM D 156).In particular, the base oil has a Noack volatility value of less than 13% by weight (calculated according to standard CEC-L-40-A 95), as well as a pour point (calculated according to standard NFT 60- 105) below -18 ° C. In addition, it has a Saybolt color value of + 30 (measured according to the ASTM D 156 method).
De plus, l'huile de base présente un indice de viscosité à froid (VIF) supérieur à 125.In addition, the base oil has a cold viscosity index (VIF) greater than 125.
Plus particulièrement, l'huile de base présente une viscosité dynamique CCS à -30 °C inférieure à 1200 mPa.s (calculée selon la norme ASTM D 5293), pour une viscosité cinématique Vk à 100 °C de 4 mm2/s.More particularly, the base oil has a dynamic CCS viscosity at -30 ° C of less than 1200 mPa.s (calculated according to standard ASTM D 5293), for a kinematic viscosity Vk at 100 ° C of 4 mm 2 / s.
En particulier, l'huile de base conforme à l'invention présente un indice de viscosité VI supérieur à 130 et inférieur ou égal à 135, pour une viscosité cinématique Vk à 100°C comprise entre 3,5 et 4,5 mm2/s ou cSt.In particular, the base oil according to the invention has a viscosity index VI greater than 130 and less than or equal to 135, for a kinematic viscosity Vk at 100 ° C of between 3.5 and 4.5 mm 2 / s or cSt.
Plus précisément, cette huile de base présente un indice de viscosité VI supérieur à 135 pour une viscosité cinématique Vk à 100 °C comprise entre 4,5 et 5 mm2/s.More specifically, this base oil has a viscosity index VI greater than 135 for a kinematic viscosity Vk at 100 ° C of between 4.5 and 5 mm 2 / s.
Un deuxième objet de l'invention concerne l'utilisation de l'huile de base définie ci-dessus, dans la formulation de lubrifiants pour moteurs, en particulier pour automobiles, en vue notamment de formuler un grade OW30.A second object of the invention relates to the use of the base oil defined above, in the formulation of lubricants for engines, in particular for automobiles, with a view in particular to formulating an OW30 grade.
Un troisième objet de l'invention concerne un procédé de préparation de l'huile de base de l'invention comprenant successivement les étapes d'hydrotraitement, d'hydrodéparaffinage, de fractionnement et d'hydrofinition de coupes de résidus issus d'hydrocraquage.A third subject of the invention relates to a process for the preparation of the base oil of the invention successively comprising the stages of hydrotreatment, hydrodewaxing, fractionation and hydrofinishing of residue cuts from hydrocracking.
Il s'est avéré que la nouvelle huile de base, selon l'invention, présente des propriétés intéressantes à froid, se caractérisant, d'une part, par un point d'écoulement inférieur à - 18 °C et, d'autre part, par un nouvel indice dit de viscosité à froid (VIF) tel que l'huile présente un rapport indice de viscosité à froid (VIF)/ indice de viscosité (VI), supérieur ou égal à 1. L'indice de viscosité à froid VIF est calculé en utilisant la formule usuelle de calcul du VI (selon la norme NF T 60-136), qui intègre les valeurs de viscosité cinématique à 100 °C et à 40 °C du produit à mesurer, mais en substituant à la valeur de viscosité cinématique à 40 °C, la valeur de viscosité cinématique à -30 °C. Cette dernière est obtenue en divisant la viscosité dynamique à - 30°C (qui est mesurable) par la densité à - 30 °C du produit, calculée à partir de la densité à 15 °C, par correction de température.It turned out that the new base oil, according to the invention, exhibits advantageous properties when cold, characterized, on the one hand, by a pour point of less than - 18 ° C and, on the other hand , by a new so-called cold viscosity index (VIF) such that the oil has a cold viscosity index (VIF) / viscosity index (VI) ratio, greater than or equal to 1. The cold viscosity index VIF is calculated in using the usual formula for calculating the VI (according to standard NF T 60-136), which integrates the values of kinematic viscosity at 100 ° C and 40 ° C of the product to be measured, but by replacing the value of kinematic viscosity with 40 ° C, the kinematic viscosity value at -30 ° C. The latter is obtained by dividing the dynamic viscosity at - 30 ° C (which is measurable) by the density at - 30 ° C of the product, calculated from the density at 15 ° C, by temperature correction.
Différentes méthodes d'analyse ont été mises en oeuvre pour analyser l'huile de base selon l'invention (huile de base A ) et les produits concurrents suivants :
- huile de base B obtenue à partir d'une charge très paraffinique, par exemple du gatsch, hydrocraquée et hydrodéparaffinée,
- huile de base C obtenue à partir d'une charge moins paraffinique, hydrocraquée et hydrodéparaffinée,
- huile de base D du type NHC5,
- huile de base E du type 150N ( groupe I).
- base oil B obtained from a very paraffinic filler, for example slack wax, hydrocracked and hydrodewaxed,
- base oil C obtained from a less paraffinic, hydrocracked and hydrodewaxed filler,
- base oil D of type NHC5,
- base oil E of type 150N (group I).
Toutes ces huiles ont une viscosité cinématique Vk@100 °C comprise entre 4 et 5 mm2/s (4 et 5 cSt).All these oils have a kinematic viscosity Vk @ 100 ° C of between 4 and 5 mm 2 / s (4 and 5 cSt).
La spectrométrie de masse a permis d'évaluer la teneur en molécules naphténiques des différentes huile de base : on trouve environ 10 % pour l'huile A, ainsi que pour l'huile B, contre 30 % pour l'huile C, 40 % pour l'huile D et 60 % pour l'huile E.Mass spectrometry made it possible to evaluate the content of naphthenic molecules in the various base oils: there are approximately 10% for oil A, as well as for oil B, against 30% for oil C, 40% for oil D and 60% for oil E.
Les spectres RMN 13C de ces huiles de base ont été obtenus par la méthode TOTAL suivante de préparation d'échantillons : on incorpore 0,77g d'huile dans 1,5 ml de chloroforme deutérié, auxquels ont été ajoutés 200 µl de dioxanne (0,23g). L'addition de dioxanne (qui donne un seul pic fin à 67,2 ppm, en dehors de la zone des carbones saturés), en quantité constante, permet une normalisation interne de chaque spectre et permet de comparer les hauteurs de pics de spectres différents entre eux. Les valeurs figurant dans le Tableau 2 ci-après sont des hauteurs de pics exprimées en cm, toutes normalisées par rapport au pic du dioxanne à 100 cm, et donc comparables entre elles.The 13 C NMR spectra of these base oils were obtained by the following TOTAL method of sample preparation: 0.77 g of oil is incorporated in 1.5 ml of deuterated chloroform, to which 200 μl of dioxane have been added ( 0.23 g). The addition of dioxane (which gives a single fine peak at 67.2 ppm, outside the saturated carbon zone), in constant quantity, allows an internal normalization of each spectrum and makes it possible to compare the peak heights of different spectra between them. The values appearing in Table 2 below are peak heights expressed in cm, all normalized with respect to the dioxane peak at 100 cm, and therefore comparable with one another.
L'examen des spectres RMN 13C fait apparaître les points suivants :
- A) carbones naphténiques : leur présence ne se traduit pas par des pics fins, mais par un fond continu dans la zone des carbones saturés (65- 5 ppm), très peu visible d'un point de vue qualitatif.
- B) carbones aromatiques : la teneur en carbones aromatiques de ces huiles est faible (inférieure à 1 %) et ceux-ci ne donnent pas de pics fins.
- C) carbones paraffiniques : le spectre de ces carbones est d'une façon générale un spectre de pics dans la zone des carbones saturés (65-5 ppm). Ces pics correspondent à des carbones paraffiniques dans des environnements particuliers. La plupart de ces pics sont identifiés et attribués à des structures connues. En particulier, on peut distinguer :
- le pic « CH2 de chaîne longue » caractéristique de motifs CH2 situés à plus de trois atomes de carbone d'un bout de chaîne ou d'une substitution ; on note (voir Tableau 2 ci-après) que la hauteur de ce pic est nettement plus grande pour l'huile de base B que pour les autres huiles de base, ce qui traduit la présence de morceaux de chaînes droites sans substitution en moyenne plus longs dans cette huile que dans les autres ; l'huile D et l'huile A présentent des valeurs plus faibles ;
- le nombre de substitutions méthyl par molécule, noté « Subst.C1 », correspond à la somme des hauteurs de quatre pics caractéristiques ; l'huile B présente la valeur la plus élevée, suivie par l'huile A et l'huile C ;
- le nombre de substitutions plus longues par molécule, c'est-à-dire de deux atomes de carbone et plus (éthyl et plus), noté « Subst. C2+ », correspond à la somme de trois pics caractéristiques ; on constate que l'huile A, selon l'invention, est nettement plus riche que les autres en substitutions longues.
- A) Naphthenic carbons: their presence does not result in fine peaks, but in a continuous background in the area of saturated carbons (65-5 ppm), very little visible from a qualitative point of view.
- B) aromatic carbons: the aromatic carbons content of these oils is low (less than 1%) and these do not give fine peaks.
- C) paraffinic carbons: the spectrum of these carbons is generally a spectrum of peaks in the region of saturated carbons (65-5 ppm). These peaks correspond to paraffinic carbons in particular environments. Most of these peaks are identified and attributed to known structures. In particular, we can distinguish:
- the “long chain CH 2 ” peak characteristic of CH 2 units located at more than three carbon atoms from a chain end or from a substitution; we note (see Table 2 below) that the height of this peak is significantly greater for base oil B than for other base oils, which indicates the presence of pieces of straight chains without substitution on average more long in this oil than in the others; oil D and oil A have lower values;
- the number of methyl substitutions per molecule, noted “Subst.C1”, corresponds to the sum of the heights of four characteristic peaks; oil B has the highest value, followed by oil A and oil C;
- the number of longer substitutions per molecule, ie two or more carbon atoms (ethyl and more), noted "Subst. C2 + ”, corresponds to the sum of three characteristic peaks; it is found that the oil A, according to the invention, is clearly richer than the others in long substitutions.
En outre, si on fait le rapport du nombre de substitutions de 2 carbones et plus sur le nombre de substitutions méthyl, on obtient la valeur la plus élevée pour l'huile A, 0,947, proche de 1, indiquant un mode de substitution équilibré, alors que, pour les huiles D,B et C, et a fortiori pour E, le rapport de substitution est plus en faveur des groupes méthyl.Furthermore, if we report the number of substitutions of 2 carbons and more on the number of methyl substitutions, we obtain the highest value for oil A, 0.947, close to 1, indicating a balanced substitution mode, whereas, for oils D, B and C, and a fortiori for E, the substitution ratio is more in favor of the methyl groups.
De même, le rapport du nombre de substitutions de 2 carbones et plus sur le nombre de motifs CH2 de chaîne longue, exprimé en %, donne une valeur supérieure à 23 % pour l'huile A, alors qu'elle n'atteint que 21,8 % pour l'huile C et environ 14 % pour les huiles B et D, l'huile E restant en-dessous de 3%. Ceci caractérise, pour l'huile A selon l'invention, une structure d'enchaînements n-paraffiniques plus courts que ceux d'une base d'origine très riche en paraffines, mais substitués d'un plus grand nombre de chaînes plus longues.
Selon un mode de réalisation préférentiel, mais non limitatif, pour obtenir les très bonnes propriétés viscosimétriques et d'écoulement à froid de l'huile de base lubrifiante selon l'invention, la Demanderesse a mis en oeuvre l'enchaînement suivant, d'étapes, à partir de résidus issus de traitement d'hydrocraquage ayant un point d'ébullition compris entre 300 et 600°C :
- (1) une première étape d'hydrotraitement à température comprise entre 380 et 480 °C, à haute pression (8 MPa<PH2<27 MPa ), et basse vitesse spatiale horaire (0,15<VVH<1 h-1), sur catalyseur du type Ni-Mo, dopé ou non, sur support de type amorphe. Lors de cette étape se produisent la décyclisation des naphtènes, la saturation des aromatiques et du craquage, conduisant à une amélioration du VI et un abaissement de la viscosité cinématique ;
- (2) une seconde étape de déparaffinage catalytique à température élevée (T comprise entre environ 300 et 400 °C), en présence d'un catalyseur de type zéolithique dopé par des métaux nobles tels que du platine, au cours de laquelle ont lieu des réactions de craquage et d'isomérisation des n-paraffines. Cette étape permet d'améliorer les propriétés à froid de la coupe traitée, notamment d'abaisser son point d'écoulement, tout en préservant la valeur du VI ;
- (3) une troisième étape de fractionnement sous vide, pour obtenir des coupes d'environ 400-470 °C (TBP), permettant d'ajuster la viscosité cinématique Vk@100 °C à environ 4 mm2/s, et la volatilité Noack en dessous de 13% ;
- (4) une dernière étape d'hydrofinition, à T<250°C, à pression élevée, (PH2>10 Mpa), à faible vitesse spatiale horaire (0,3<VVH<0,8 h-1) et avec un catalyseur Pt /Pd ou Ni, permettant de saturer les composés aromatiques (teneur <1000 ppm) pour conférer à l'huile une faible coloration (valeur de couleur Saybolt +30) et une stabilité à l'oxydation.
- (1) a first hydrotreatment step at a temperature between 380 and 480 ° C, at high pressure (8 MPa <PH 2 <27 MPa), and low hourly space speed (0.15 <VVH <1 h -1 ) , on a Ni-Mo type catalyst, doped or not, on an amorphous type support. During this stage, the decyclization of the naphthenes occurs, the saturation of the aromatics and the cracking, leading to an improvement in the VI and a lowering of the kinematic viscosity;
- (2) a second stage of catalytic dewaxing at high temperature (T between approximately 300 and 400 ° C.), in the presence of a zeolitic type catalyst doped with noble metals such as platinum, during which cracking and isomerization reactions of n-paraffins. This step makes it possible to improve the cold properties of the treated cut, in particular to lower its pour point, while preserving the value of the VI;
- (3) a third vacuum fractionation step, to obtain sections of approximately 400-470 ° C (TBP), allowing the kinematic viscosity Vk @ 100 ° C to be adjusted to approximately 4 mm 2 / s, and the volatility Noack below 13%;
- (4) a final hydrofinishing step, at T <250 ° C, at high pressure, (PH 2 > 10 Mpa), at low hourly space speed (0.3 <VVH <0.8 h -1 ) and with a Pt / Pd or Ni catalyst, allowing the aromatic compounds to be saturated (content <1000 ppm) to give the oil a weak coloration (Saybolt color value +30) and oxidation stability.
Toutefois, d'autres types de charges peuvent avantageusement être utilisés, en mélange avec les charges précédentes, pour les doper, notamment des paraffines ou cires de synthèse Fischer-Tropsch, des cires ou gatschs, et des distillats de distillation atmosphérique ou sous vide.However, other types of fillers can advantageously be used, in mixture with the previous fillers, for doping them, in particular paraffins or Fischer-Tropsch synthetic waxes, waxes or slack waxes, and distillates for atmospheric or vacuum distillation.
Par ailleurs, il peut aussi être envisagé d'obtenir l'huile de base lubrifiante selon l'invention, par oligomérisation d'oléfines, en particulier d'alpha-oléfines légères présentes notamment dans l'essence lourde des unités de viscoréduction ou dans l'essence de FCC (craqueur catalytique). Cette oligomérisation est réalisée en présence d'un catalyseur du type acide phosphorique ou chlorure d'aluminium, à des températures comprises entre environ 190°C et 340°C et elle conduit à des produits hydrocarbonés à chaînes longues très ramifiées.Furthermore, it can also be envisaged to obtain the lubricating base oil according to the invention, by oligomerization of olefins, in particular of light alpha-olefins present in particular in the heavy petrol of visbreaking units or in l essence of FCC (cracker catalytic). This oligomerization is carried out in the presence of a catalyst of the phosphoric acid or aluminum chloride type, at temperatures between approximately 190 ° C. and 340 ° C. and it leads to hydrocarbon products with very branched long chains.
Les huiles de base ainsi obtenues, ayant un VI supérieur à 130 et un VIF supérieur à 125, peuvent remplacer des bases lubrifiantes synthétiques du type des PAO, avec un avantage économique intéressant, dans des formulations pour huiles pour moteurs d'automobile et notamment dans des grades tels que OW30, pour lesquels les exigences des propriétés à froid sont les plus sévères : viscosité cinématique Vk@100 °C comprise entre 9,3 et 12,5 mm2/s et viscosité dynamique CCS à -30°C inférieure à 3250 mPa.s.The base oils thus obtained, having a VI greater than 130 and a VIF greater than 125, can replace synthetic lubricating bases of the PAO type, with an advantageous economic advantage, in formulations for oils for automobile engines and in particular in grades such as OW30, for which the requirements of cold properties are the most severe: kinematic viscosity Vk @ 100 ° C between 9.3 and 12.5 mm 2 / s and dynamic viscosity CCS at -30 ° C less than 3250 mPa.s.
La Demanderesse a ainsi formulé une huile moteur de grade OW30 de composition, en % de poids :
- huile de base A : 80,1
- additif de performance : 13,8
- additif améliorant le VI : 5,8
- additif diminuant le point d'écoulement : 0,3
- base oil A: 80.1
- performance additive: 13.8
- VI improving additive: 5.8
- additive reducing the pour point: 0.3
Cette huile présente les caractéristiques suivantes :
- viscosité cinématique Vk@100°C : 9,65 mm2/s
- viscosité cinématique à 40°C : 50,8 mm2/s
- VI : 178
- viscosité dynamique CCS à -30°C : 3000 mPa.s,
- kinematic viscosity Vk @ 100 ° C: 9.65 mm 2 / s
- kinematic viscosity at 40 ° C: 50.8 mm 2 / s
- VI: 178
- CCS dynamic viscosity at -30 ° C: 3000 mPa.s,
Ces bases peuvent aussi trouver des applications intéressantes dans des formulations pour des lubrifiants industriels.These bases can also find interesting applications in formulations for industrial lubricants.
Claims (12)
- A hydrocarbon base oil for lubricants having a viscosity index (VI) greater than or equal to 130, principally comprising long isoparaffinic hydrocarbon chains containing a number of carbon atoms higher than 25 and branched over several carbon atoms, characterised in that these hydrocarbon chains have a ratio of the number of substituents composed of at least two carbon atoms to the number of methyl substituents greater than or equal to 0.9, and in that these chains have a ratio of the number of substituents composed of at least two carbon atoms to the number of long chain CH2 groups greater than or equal to 0.23.
- A base oil according to claim 1, characterised in that it has a ratio of the cold viscosity index (VIF) to the viscosity index (VI) greater than or equal to 1.
- A base oil according to either one of claims 1 and 2, characterised in that it has a content of naphthenic molecules lower than or equal to 0.1.
- A base oil according to any one of claims 1 to 3, characterised in that it has a Noack volatility value lower than 13 % by weight.
- A base oil according to any one of claims 1 to 3, characterised in that it has a flow point below -18°C.
- A base oil according to any one claims 1 to 3, characterised in that has a Saybolt colour value of +30.
- A base oil according to claim 2, characterised in that it has a cold viscosity index (VIF) greater than 125.
- A base oil according to any one of the preceding claims, characterised in that it has a dynamic viscosity at -30°C of less than 1200 m Pa.s, for a kinematic viscosity Vk at 100°C of 4 mm2/s.
- A base oil according to any one of claims 1 to 3, characterised in that it has a viscosity index (VI) of between 130 and 135 for a kinematic viscosity Vk at 100°C of between 3.5 and 4.5 mm2/s.
- A base oil according to any one of claims 1 to 3, characterised in that it has a viscosity index VI greater than 135 for a kinematic viscosity Vk at 100°C of 4.5 and 5 mm2/s.
- Use of the base oil according to any one of the preceding claims, in the formulation of engine lubricants, in particular for automobiles, especially with a view to formulating a 0W30 grade.
- A process for preparing a base oil according to any one of claims 1 to 10, characterised in that it comprises the following successive steps:a) a first hydrotreatment step at a temperature of between 380°C and 480°C, at high pressure (8 MPa<PH2<27 MPa), and low hourly spatial velocity (0.15<VVH<1 h-1), over a catalyst of Ni-Mo type, which is doped or not, on a support of amorphous type, of residues arising from a hydrocracking treatment having a boiling point of between 350 and 600°C;b) a second catalytic dewaxing step at high temperature (T between about 300 and 400°C), in the presence of a catalyst of the zeolitic type doped with noble metals, such as platinum;c) a third vacuum fractionation step so as to obtain fractions of approximately 400-470°C (TBP);d) a final hydrofinishing step, at T<250°C, at high pressure, (PH2>10 Mpa), at low hourly spatial velocity (0.3<WH<0.8 h-1) and with a Pt/Pd or Ni catalyst.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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FR9911219A FR2798136B1 (en) | 1999-09-08 | 1999-09-08 | NEW HYDROCARBON BASE OIL FOR LUBRICANTS WITH VERY HIGH VISCOSITY INDEX |
FR9911219 | 1999-09-08 | ||
PCT/FR2000/002463 WO2001018156A1 (en) | 1999-09-08 | 2000-09-07 | Novel hydrocarbon base oil for lubricants with very high viscosity index |
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EP00960815A Revoked EP1212390B1 (en) | 1999-09-08 | 2000-09-07 | Hydrocarbon base oil for lubricants with a very high viscosity index |
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EP (1) | EP1212390B1 (en) |
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ZA200201564B (en) | 2003-07-30 |
FR2798136A1 (en) | 2001-03-09 |
ES2190986T3 (en) | 2003-09-01 |
CA2382893A1 (en) | 2001-03-15 |
FR2798136B1 (en) | 2001-11-16 |
PT1212390E (en) | 2003-06-30 |
AU769075B2 (en) | 2004-01-15 |
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