EP2049625A2

EP2049625A2 - Use of efficiency reveal compounds of filterability additives in hydrocarbon distillates, and synergic composition comprising them

Info

Publication number: EP2049625A2
Application number: EP07823255A
Authority: EP
Inventors: Nelly Dolmazon; Laurent Dalix; Erwan Chevrot; Frédéric Tort
Original assignee: Total Raffinage Marketing SA
Current assignee: TotalEnergies Marketing Services SA
Priority date: 2006-07-10
Filing date: 2007-07-06
Publication date: 2009-04-22
Anticipated expiration: 2027-07-06
Also published as: EP3399009A1; CA2657341C; AR061965A1; KR101535507B1; US20100058653A1; WO2008006965A3; JP2009542887A; KR20090045232A; BRPI0714136A2; EA200970105A1; JP5386045B2; BRPI0714136B8; JP2013076093A; KR20150011006A; EP2049625B1; EA019894B1; UY30474A1; US20170002283A1; KR101606056B1; IL196430A

Abstract

The invention relates to the use, in a hydrocarbon distillate with a boiling temperature of between 150 and 450°C and a crystallization onset temperature as measured by Differential Calorimetric Analysis of greater than or equal to -50°C, preferably of -5°C to +10°C, of a homopolymer obtained from an olefinic ester of carboxylic acid of 3 to 12 carbon atoms and from a fatty alcohol containing a chain of more than 16 carbon atoms and optionally an olefinic double bond, as a compound for revealing the efficiency of filterability additives based on copolymer and/or terpolymers of ethylene and of vinyl ester of a carboxylic acid of 3 to 12 carbon atoms, and of a monoalcohol containing 1 to 10 carbon atoms. The invention is also directed to an additive composition comprising a conventional hydrocarbon filterability additive in combination with an efficiency reveal additive, and also to the combustion fuels, motor fuel and oil fuel that comprise these additive combinations.

Description

USE OF EFFICIENCY-CREATING COMPOUNDS

FILTRABILITY ADDITIVES IN HYDROCARBON DISTILLATES, AND SYNERGIC COMPOSITION CONTAINING SAME.

The invention relates to the use in hydrocarbon distillates of which the initial crystallization temperature of the paraffins is greater than or equal to -5 ° C., of a developer of the effectiveness of the conventional hydrocarbon filterability additives with respect to the filterability limit temperature of these distillates and their flow temperature at low temperatures. The invention also provides an additive composition comprising a conventional hydrocarbon filterability additive in combination with an efficiency developer as well as fuels, fuel and fuel comprising these additive combinations.

For a long time, the oil industry has developed additives that promote the filterability of fuels at low temperatures. These additives, called TLF (Limit Filtration Limit) additives, have the role of limiting the crystal size of the paraffins formed in order to pass the filters arranged inside the internal combustion engines or in the heating installations. This type of additives, widely known to those skilled in the art, is systematically added to conventional middle distillates used as diesel fuels or as heating fuel.

The prior art describes the use of other products having a synergistic effect with the known filterability additives, in particular the ethylene and vinyl acetate and / or vinyl propionate polymers, vis-à-vis improvement of the filterability limit temperature and the low temperature flow temperature of conventional hydrocarbon distillates.

Thus, US Pat. No. 3,254,527 describes a distillate distillation distillate of between 177 and 400 ° C. containing an additive consisting of from 90 to 10% by weight of an ethylene copolymer comprising from 10 to 30% of acetate units. vinyl having a molecular weight of between 1000 and 3000 and 10 to 90% by weight of lauryl polyacrylate and / or lauryl polymethyl methacrylate having a weight-average molecular weight of from 760 to 100,000. It is noted that these polyacrylates improve the filterability temperature determined according to NF ENl 16 without damaging the pour point temperature determined by the NF 60105 standard while the ethylene-vinyl acetate copolymer improves the flow. .

For the transportation of crude oils and heavy distillates by pipeline, the authors of US Pat. No. 3,726,653 were confronted with the improvement of the flow, particularly at the low temperatures at which these products could freeze in the pipelines. To improve these properties in paraffin-containing hydrocarbon compositions of which 5 to 20% by weight have a boiling point greater than 350 ° C. and a softening point greater than 35 ^° C., the inventors propose adding to these compositions 10 ppm by weight of a polymer mixture of an olefinic ester of carboxylic acids of 3 to 5 carbon atoms with an alcohol of 14 to 30 carbon atoms and a weight-average molecular weight of 1000 to 1000. 000, with a copolymer of ethylene and vinyl acetate comprising from 1 to 40, preferably from 14 to 24 vinyl acetate units of average molecular weight from 20,000 to 60,000, the molar ratio of olefinic ester polymer to copolymer of ethylene and vinyl acetate ranging from 0.1 to 10: 1.

To control the size of paraffin crystals present at levels of less than 3% in middle distillates having a boiling point between 120 ° and 48O ⁰ C, the authors of US Patent 4153422 propose to add to these distillates means of 10 ppm to 1% by weight of a mixture of a homopolymer of an olefinic ester of acrylic or methacrylic acid comprising an alkyl chain of 14 to 16 carbon atoms and a weight-average molecular weight of from 1000 to 200,000, with a copolymer of ethylene and vinyl acetate having a number average molecular weight of less than 4000. The molar ratio of olefinic ester homopolymer to ethylene-vinyl acetate copolymer ranging from 0.1: 1 to 20: 1 . But, with the increasing variety of source of middle distillates, the current middle distillates resulting from the mixing of these sources such as diesel fuels and domestic fuels now have very different compositions from those of the middle distillates previously produced and for which the filterability additives especially those based on copolymers of ethylene and vinyl acetate and / or ethylene and vinyl propionate had been developed. In addition, the evolution of specifications since 2000, and more recently in 2005, has led the manufacturer to formulate distillates separately for use as diesel fuels in engines, and domestic fuel oils used in heating installations. . The distillates used are generally derived from more complex refining operations than those resulting from the direct distillation of hydrocarbons and can come from cracking, hydrocracking and catalytic cracking processes and visbreaking processes. With the increasing demand for diesel fuels, the refiner tends to want to introduce cuts that are more difficult to exploit in these fuels, such as the heaviest cuts resulting from cracking and visbreaking processes which are loaded with heavy paraffins, that is to say that is, comprising more than 18 carbon atoms. In addition, the synthetic distillates resulting from the transformation of the gas such as those resulting from the Fischer Tropsch process, but also those resulting from the treatment of biomass of plant or animal origin, such as NexBTL and distillates comprising esters of vegetable or animal oils, have appeared on the market and constitute a new range of products that can be used as fuel and base bases. domestic fuel oil also comprising paraffinic chains close to or greater than 18 carbon atoms.

It has been found that the filterability temperature of the distillates obtained by combining the old bases and these new sources is hardly improved by the addition of conventional filterability additive because of the large presence of normal paraffins of more than 18 carbon atoms. and in particular the complex distribution of normal paraffins in their composition. It has been noted in fact in these new combinations of distillates, discontinuous paraffin distributions, making the known filterability additives inadequate. In addition, the arrival of new crude oils on the market much richer in paraffins than those commonly refined and whose filterability temperature of straight-run distillates was hardly improved by conventional filterability additives in the same way as those previously mentioned.

In the documents of the prior art, the authors therefore use combinations of alkylene vinyl ester polymers with vinyl polyesters to resolve mainly problems of pour point improvement, and filterability temperature for distillates of conventional type, and give no indication for solving the specific problems associated with new hydrocarbon distillates whose initial crystallization temperature of paraffins is close to zero and / or whose content of normal paraffins containing more than 18 carbon atoms is greater than 4%.

There is therefore a need to adapt the filterability additives to these new types of distillates.

Thus, this invention applies not only to distillates resulting from the direct distillation of hydrocarbons derived from crude oils which are heavily loaded with paraffins, but also and especially from hydrocarbons obtained from the heaviest cuts of refining operations, that is to say from cracking, hydrocracking and catalytic cracking processes and visbreaking processes or synthetic distillates resulting from gas transformation such as those derived from the Fischer Tropsch process, but also those resulting from the treatment of plant or animal biomass, such as in particular the NexBTL and distillates containing esters of vegetable and / or animal oils, alone or in admixture.

One of the routes chosen by the applicant is that of improving the activity of conventional filterability additives with respect to the temperature limit of The ability of the middle distillates to be obtained by the addition of another polymer as an agent to reveal the effectiveness of conventional filtration additives present in the middle distillate by producing a synergistic effect.

To this end, the present invention provides use in a hydrocarbon distillate having a boiling point of from 150 to 450 ° C and a starting crystallization temperature measured by Differential Calorimetric Analysis greater than or equal to -5 ° C preferably -5 ° C to + 10 ° C, a homopolymer obtained from an olefinic carboxylic acid ester of 3 to 12 carbon atoms and a fatty alcohol comprising a chain of more than 16 carbon atoms and optionally an olefinic double bond, as a compound for revealing the effectiveness of the copolymer and / or terpolymer ethylene and vinyl ester copolymerability additives of a carboxylic acid of 3 to 5 carbon atoms and a mono alcohol comprising 1 to 10 carbon atoms,

Preferably, the hydrocarbon distillate comprises a content by weight of n-paraffins containing more than 18 carbon atoms greater than 4%.

Preferably, the hydrocarbon distillate comprises a content by weight greater than or equal to 0.7% of n-paraffins whose carbon number is greater than 24, preferably a mixture of 0.7 to 2% by weight of n-paraffins. having a carbon number ranging from C24 to C40. According to one embodiment, the filtration additives are copolymers of ethylene containing more than 20% of ester units.

Preferably, the flowability additives are chosen from copolymers of ethylene and vinyl acetate, ethylene and vinyl propionate of ethylene and of vinyl, ethylene and (alkyl) acrylate versatate. ethylene and (alkyl) methacrylates, alone or as a mixture, comprising from 20 to 40% by weight of ester units.

According to a preferred embodiment, the said esters are of the vinyl acetate, vinyl propionate, vinyl versatate, (alkyl) acrylate and (alkyl) methacrylate type, the alkyl group containing from 1 to 7 carbon atoms. According to one embodiment, the homopolymer is obtained by polymerization of an olefinic ester of acrylic acid optionally substituted with an alkyl group having from 1 to 7 carbon atoms, and an alcohol comprising more than 16 carbon atoms, preferably from 18 to 50 carbon atoms, the homopolymer having a weight average molecular weight Mw of between 5,000 and 20,000, preferably between 10,000 and 19,000.

According to a particular embodiment, the homopolymer is a polyacrylate comprising hydrocarbon side chains of 18 to 40 carbon atoms. According to a particular embodiment, the distillate is chosen from boiling point distillates of between 150 ° and 450 ° C. including straight-run distillates, vacuum distillates, hydrotreated distillates and distillates obtained from catalytic cracking. and / or the hydrocracking of vacuum distillates, the distillates resulting from conversion processes of the ARDS type (by atmospheric residue desulfurization) and / or visbreaking, the distillates from the recovery of Fischer Tropsch cuts, and the distillates resulting from the conversion. BTL of plant and / or animal biomass, and distillates containing alkyl esters of vegetable or animal oils, alone or as a mixture. According to another object the invention relates to a composition comprising a mixture consisting of

A) a filterability additive based on copolymer and / or terpolymer of ethylene and vinyl ester of a carboxylic acid of 3 to 5 carbon atoms and a monoalcohol comprising 1 to 10 carbon atoms and B) a homopolymer of an olefinic carboxylic acid ester of 3 to 12 carbon atoms and a fatty alcohol having more than 16 carbon atoms

A and B being in a ratio producing a synergistic effect with respect to the TLF filterability temperature measured according to the NF EN 16 standard, hydrocarbon distillates having a boiling point between 150 and 450 ° C. and an initial crystallization temperature. measured by differential scanning calorimetry greater than or equal to -5 ⁰ C preferably from -5 to + 10 ° C.

According to another object the invention relates to a composition comprising (A) from 85 to 99% by weight of at least one filterability additive based on a copolymer and / or terpolymer of ethylene and a vinyl ester of a carboxylic acid of 3 to 5 carbon atoms and a monohydric alcohol having 1 to 10 carbon atoms; and (B) 1 to 15% by weight of a homopolymer of an olefinic carboxylic acid ester of 3 to 12 carbon atoms and a fatty alcohol comprising more than 16 carbon atoms.

According to a particular embodiment of the composition, the homopolymer has a weight average molecular weight Mw of between 5,000 and 20,000, preferably between 10,000 and 19,000.

Preferably, the homopolymer is an olefinic ester of acrylic acid with an alcohol comprising from 18 to 50 carbon atoms.

Preferably, the homopolymer is a polyacrylate comprising side hydrocarbon chains of 18 to 40 carbon atoms.

Preferably, in the composition according to the invention, the filterability additive is chosen from ethylene copolymers and terpolymers containing more than 20% of ester units, these ester units being themselves chosen from acetate-type esters. vinyl, vinylpropionate, alkylacrylates and alkylmethacrylates taken alone or in a mixture, the alkyl group containing from 1 to 7 carbon atoms.

According to a preferred embodiment, the filterability additives are chosen from copolymers or terpolymers of ethylene and vinyl acetate, and / or vinyl propionate, and / or vinyl versatate, ethylene and / or (alkyl) acrylates, and / or (alkyl) methacrylates, alone or as a mixture, comprising from 20 to 40% by weight of ester units.

According to a preferred embodiment, the filterability additives are chosen from copolymers or terpolymers of ethylene and vinyl acetate, and / or vinyl propionate, and / or vinyl versatate, ethylene and / or (alkyl) acrylates, and / or (alkyl) methacrylates having a weight average molecular weight of from 3,000 to 20,000.

According to a preferred embodiment, the composition according to the invention comprises from 85 to 98% by weight of copolymers of ethylene and of vinyl acetate comprising from 25 to 30% by weight of vinyl acetate units and from 2 to 15% by weight. % by weight of polyacrylate comprising side hydrocarbon chains of 18 to 40 carbon atoms and average molecular weight ranging from 10,000 to 19,000.

According to another object the invention relates to a hydrocarbon distillate comprising from 0 to 5000 ppm of sulfur, and containing from 10 to 5000 ppm of said composition according to the invention, optionally mixed with other dispersing detergent additives, demulsifiers, antifoams, biocides, resorbers, cetane improvers, anticorrosions, friction modifiers, lubricant, combustion, cloud point, pour point, antisedimentation and conductivity improvers. Preferably, the distillate comprises at least one hydrocarbon fraction derived from the group consisting of distillates with a boiling point of between 150 ° and 450 ° C. and an initial crystallization temperature Tcc of greater than or equal to -5 ° C., preferably between 5 ° C and + 10 ° C, including straight-run distillates, vacuum distillates, hydrotreated distillates, distillates from catalytic cracking and / or hydrocracking of vacuum distillates, distillates resulting from conversion processes type ARDS and / or visbreaking, distillates from the recovery of Fischer Tropsch cuts, distillates resulting from the BTL conversion of plant and / or animal biomass, taken alone or in combination, and esters of vegetable and animal oils or their mixtures. Preferably the distillate comprises an n-paraffin content containing more than 18 carbon atoms greater than 4% by weight.

Preferably the distillate comprises a content greater than or equal to 0.7% by weight of n-paraffms whose carbon number is greater than 24. Preferably the distillate comprises from 0.7 to 2% of n-paraffins having a carbon number varying from C24 to C40.

According to another object the invention relates to a diesel fuel comprising from 0 to 500 ppm of sulfur comprising at least one distillate according to the invention. According to another object the invention relates to a heating oil comprising 0 to 5000 ppm of sulfur comprising at least one distillate according to the invention.

According to another object, the invention relates to a heavy fuel comprising at least one distillate according to the invention. The invention applies to distillates which can be used as diesel fuel or heating fuel, also called domestic fuel oil. These distillates have a starting crystallization temperature or Tcc greater than or equal to -5 ° C., preferably between -5 ° C. and +10 ^° C. This temperature Tcc is measured by ACD, this technique making it possible to determine the temperature at which the first paraffin crystals are formed, these generally corresponding to normal paraffins of chain length greater than or equal to 18 carbon atoms, paraffins with more than 24 carbon atoms being the first to crystallize when the temperature decreases.

The advantage of the present invention lies in the synergistic effect of the use of compounds according to the invention known as "developers" of the effectiveness of conventional filterability additives or TLF with respect to the reduction of the temperature of the filterability of these hydrocarbon distillates refractory to the action of conventional filterability additives used alone.

Thus, the invention is particularly directed to the use of a homopolymer-type developer compound in a hydrocarbon distillate comprising a content by weight of n-paraffins containing more than 18 carbon atoms greater than 4%. More particularly, the hydrocarbon distillate comprises a content by weight greater than or equal to 0.7% of n-paraffins whose carbon number is greater than 24. Preferably, the distillate is a boiling point fraction of between 150 and 45O ⁰ C, and comprises a mixture of 0.7 to 2% by weight of n-paraffins having a carbon number ranging from C24 to C40. The filterability additives of the invention are ethylene copolymers or terpolymers containing more than 20% ester units. These esters are of the vinyl acetate, vinyl propionate, vinyl versatate, (alkyl) acrylate and (alkyl) methacrylate type, the alkyl group containing from 1 to 7 carbon atoms. The preferred filterability additives are selected from copolymers of ethylene and vinyl acetate, and / or vinyl propionate, and / or vinyl versatate, and / or (alkyl) acrylates, and / or (alkyl) methacrylates, alone or in admixture, comprising from 20 to 40% by weight of ester units. Preferably, the filterability additives used in the invention are copolymers or terpolymers of between 5,000 and 20,000. These copolymers or terpolymers have ester levels of between 20% and 40%.

The additives revealing the effectiveness of the filterability additives according to the invention are homoporymers obtained by polymerization of an olefinic ester of acrylic acid optionally substituted by an alkyl group having from 1 to 7 carbon atoms, and an alcohol comprising more than 16 carbon atoms, preferably from 18 to 50 carbon atoms.

The homopolymer has a weight average molecular weight Mw of between 5,000 and 20,000 and preferably between 1,000 and 19,000. Preferably, the homopolymer is a polyacrylate comprising side hydrocarbon chains of 18 to 40 carbon atoms.

The effectiveness of the developer varies with its weight-average molecular weight, the chain length of the alcohol, and the nature of the carboxylic acid used to synthesize the ester. The homopolymers according to the invention for revealing the effectiveness of conventional TLF filterability additives are selected from a set of polyacrylates useful for improving the pour point of easy-to-treat distillates. However, not all are effective at revealing a synergistic effect with conventional TLF additives.

The distillates targeted by the invention are chosen from distillates having a boiling point of between 150 and 450 ^° C. and starting crystallization temperature Tcc of greater than or equal to -5 ° C., preferably of between -5 ° C. and + 10 ⁰ C, including straight-run distillates, vacuum distillates, hydrotreated distillates, distillates from catalytic cracking and / or hydrocracking of vacuum distillates, distillates resulting from conversion processes of the AKDS type and / or visbreaking, distillates derived from the recovery of Fischer Tropsch slices, and distillates resulting from the BTL conversion of plant and / or animal biomass, and distillates containing alkyl esters of vegetable or animal oils and / or their mixture .

Another object of the invention is a synergistic additive composition dedicated to boiling point distillates between 150 ° C and 450 ⁰ C, at a temperature of near zero initial crystallization, in particular between -5 and +10 ⁰ vs.

This synergistic composition comprises a mixture consisting of a filterability additive and a homopolymer according to the invention in a ratio producing a synergistic effect with respect to the TLF filterability temperature of the distillates according to the invention, TLF measured according to the standard NF ENl 16.

More particularly, this composition comprises from 85 to 99% by weight of at least one filterability additive based on ethylene copolymer or terpolymer and a vinyl ester of a carboxylic acid of 3 to 5 carbon atoms and a monohydric alcohol comprising 1 to 10 carbon atoms, and 1 to 15% by weight of a homopolymer of an olefinic ester of carboxylic acid of 3 to 12 carbon atoms and a fatty alcohol comprising more than 16 carbon atoms. In this composition, the homopolymer has a weight average molecular weight M w of between 5,000 and 20,000, preferably between 10,000 and 19,000. It is an olefinic ester of acrylic acid with an alcohol comprising from 18 to 50 carbon atoms. Preferably, the rhomopolymer is a polyacrylate comprising side hydrocarbon chains of 18 to 40 carbon atoms. The filterability additives adapted to the said composition according to the invention are chosen from ethylene copolymers and terpolymers containing more than 20% of ester units, these ester units being themselves chosen from vinyl acetate type propionate esters. vinyl, (alkyl) acrylates and (alkyl) methacrylates, the alkyl group containing from 1 to 7 carbon atoms. Preferably, these filterability additives are chosen from copolymers or terpolymers of ethylene of vinyl acetate, and / or of vinyl propionate, and / or of vinyl, ethylene and / or (alkyl) versatate. acrylates, and / or (alkyl) methacrylates comprising from 20 to 40% by weight of ester units. These polymers or terpolymers have a weight-average molecular weight of between 3,000 and 20,000. In a preferred embodiment of the invention, the composition will comprise from 85% to

98% by weight of copolymers of ethylene and vinyl acetate comprising from 25 to 30% by weight of vinyl acetate units, and from 2 to 15% by weight of polyacrylate comprising hydrocarbon side chains of 18 to 40 carbon atoms carbon and average molecular weight ranging from 10,000 to 19,000. Another subject of the invention relates to the hydrocarbon distillate whose sulfur content is between 0 and 5000 ppm and which comprises from 10 to 5000 ppm of said composition, optionally mixed with other detergent, dispersant and demulsifier additives, biocides, antifoams, deodorants, cetane improvers, anti-corrosions, friction modifiers, lubricity, combustion, cloud point, pour point, antisedimentation and conductivity improvers.

This distillate according to the invention comprises a major part of at least one hydrocarbon fraction having a starting crystallization temperature Tcc of greater than or equal to -5 ° C., preferably of between -5 ° C. and +10 ^° C., resulting from the group. consisting of boiling point distillates of between 150 ° C and 450 ° C including straight-run distillates, vacuum distillates, hydrotreated distillates, distillates from catalytic cracking and / or distillate hydrocracking under empty, distillates resulting from conversion processes type ARDS and / or visbreaking, distillates from the recovery of Fischer Tropsch cuts, distillates resulting from BTL conversion of plant and / or animal biomass, taken alone or in combination, and vegetable oil esters and animals or their mixtures. These distillates comprise an n-paraffin content containing more than 18 carbon atoms greater than 4% by weight, and preferably a content greater than or equal to 0.7% by weight of n-paraffins whose carbon number is greater than at 24.

The distillates which are particularly reactive with the said composition comprise in their chemical composition from 0.7 to 2% of n-paraffins having a carbon number varying from 24 to 40, the n-paraffin distribution being continuous or discontinuous; that is, all n-paraffin families are present or some are absent, thus constituting discontinuities, especially when distillate mixtures are made.

The invention also relates to a fuel, a fuel comprising from 0 to 500 ppm of sulfur and / or a heating oil comprising from 0 to 5000 ppm of sulfur or a heavy fuel oil used as fuel in marine engines and industrial boilers, these products containing a major portion of hydrocarbon base consisting of at least one distillate according to the invention and a corresponding minor portion of 50 to 5000 ppm of a synergistic composition of additives using a developer compound according to the invention. This additive composition may be present in the fuel or fuel with at least one additive of the group consisting of detergent additives, dispersants, demulsifiers, biocides, antifoams, deodorants, cetane improvers, anticorrosions, friction modifiers, lubricant, combustion, cloud point, pour point, antisedimentation and conductivity improvers.

For purposes of illustrating the advantages of the present invention, examples are given without limitation. EXAMPLE 1

This example describes the nature of the components of the invention and comparative compounds.

The distillates according to the invention which are refractory to filterability additives or TLF (CFPP in English) alone are called Fi and the distillates which are not refractory to these additives are called Gi. They are described in Table I below. TABLE I

*% by weight of paraffins determined by coupling liquid chromatography / gas chromatography. PTE = flow temperature TLF = filterability temperature

PT = cloud point temperature measured by ASTM D2500 or EN 23015. Tcc = starting crystallization temperature measured by Differential Scanning Calorimetry (DSC or DSC) or according to IP389-93 The TEP or pour point measured for distillates used as fuels is the lowest temperature at which the hydrocarbon can still flow.

PT or cloud point is a visual appreciation of sprouting and crystallization of paraffins, this measurement is less accurate than that of the starting crystallization temperature Tcc.

TLF, the filterability limit temperature of paraffin crystals precipitating in hydrocarbons at low temperature, is intermediate between these two extreme temperatures PTE and Tcc: it is intended to appreciate the temperature at which the size of the crystals is still small enough not to clog the filters.

In general, the respective variations of TLF, PTE and Tcc are not necessarily related to each other and are most often dependent on the chemical composition of the products.

Examples of the distillates F1, F2, F3 according to the invention have a n-paraffin content greater than or equal to 0.7% and a Tcc> -5 ⁰ C, whereas the distillates G1, G2 have a n paraffins less than 0.7% and Tcc <-5 ° C.

The distribution of paraffins is determined by liquid / gas chromatography. This method makes it possible to determine the n-paraffin concentration of C9 to C30 in the middle distillates.

In a first step liquid chromatography makes it possible to separate the middle distillate as a function of the chemical families (saturated, mono, di and aromatic tri). The n-paraffins being in the saturated fraction, the latter is recovered and injected onto a column in gas chromatography where the paraffins are separated according to their boiling point and therefore their carbon number. Finally, paraffins are quantified by calibration.

The filterability additives used are copolymers of ethylene and vinyl acetate, hereinafter referred to as EVAi in Table II below.

TABLE II

The developers used are bi-labeled polyacrylates whose characteristics are given at 30% of active ingredients in a solvarex-type aromatic solvent (aromatic hydrocarbon fraction of 8 to 20 carbons and boiling point ranging from 140 to 320 ° C.) in Table III below.

As examples of preparation, these polyacrylates are obtained by polymerization under an inert nitrogen atmosphere of the monomer as follows.

100 parts of this monomer is melted beforehand in an oven at 70 ° C. and then solubilized in 158 parts of aromatic solvent (solvarex 10 or solvarex 150). The mixture obtained is introduced continuously for 6:30 and under stirring in a tank under a nitrogen atmosphere containing 75 parts by weight of aromatic solvent and 4 parts by weight of organic peroxide, this mixture having been previously heated to 100 ° C. Throughout the addition, the set temperature is maintained at 100 ^° C. The reactor is cooled and the resin stabilized by the addition of 100 ppm of 4-methoxyphenol, in order to avoid post-polymerization of the residual monomers which may lead to a change in the average molar mass of the polymers during storage.

TABLE III

EXAMPLE 2

The present example aims to demonstrate the interest of the developers Bi according to the invention and their influence on the effectiveness of TLF additives on the distillates Fi of the invention and the distillates Gi.

Table IV summarizes the results obtained by comparing the effectiveness of B1 alone or in combination with the TLF EVA1 and EV A2 additives on the Fi and Gi distillates. TABLE IV

It is observed that the Fc distillates of Tcc greater than -5 ° C. are little or not reactive to the EVAi alone but are reactive to the EVAi / Bi synergistic mixtures while the distillates outside the invention Gc whose Tcc is less than 5 ° C are only reactive to EVA alone.

It should be noted that the developer B alone also shows no TLF efficiency on any of the Fi or Gi distillate families. EXAMPLE 3

The present example describes the influence of the relative concentration of Bi developers and TLF EVAi additives on the reduction of TLF temperatures of the typical F1 units of the invention.

Table V collates the filterability temperatures of the distillates F1 and F2 when varying the concentration of Bi developer for varying concentrations of the EVAi / Bi composition. TABLE V

The tests carried out by varying the ratio EVA / B1 demonstrate in the case of distillates Fi optimum efficiency for low doses of developer.

By taking Gi distillates, on the contrary, there is a loss of EVAi efficiency with the increase in the concentration of Bi developers, resulting in an increase in the filterability temperature of the distillate. EXAMPLE 4 This example describes the preferred polymers of the invention selected from olefinic ester polymers of carboxylic acids and alcohol.

It is a question of describing the impact of the nature of the carboxylic acid and that of the length of chain of the alcohol on the decrease of the filterability temperature of the distillates Fl and F2. In the composition according to the invention, the content of homopolymers of olefinic ester of carboxylic acids and of alcohol is 4.5% for a content of EVA1 of 95.5%.

The content of the composition in the distillates ranges from 0 to 300 ppm in the present example. The results obtained are summarized in Table VI below,

TABLE VI

The effectiveness of the developer compound varies depending on the chain length of the alcohol and the nature of the carboxylic acid used to synthesize the polyester.

In Table VI above, efficiency tests were carried out with developers synthesized by homopolymerization of alkyl acrylates of chain length varying from Cl 2 to C 40 (according to the procedure described in Example 1). These results clearly show that the positive effect of the developer appears for polymers consisting predominantly of alkyl chains greater than Cl 6. The best results are obtained with C18-C22 acrylate and C30-C40 acrylate.

Other tests substituting the developer compound B1 by polymers synthesized by copolymerization of C18-C22 acrylate with vinyl acetate (ratio: 70/30) or with 2-ethyl-hexyl acrylate (ratio 80 / 20 and 50/50) demonstrate that these copolymers are not effective in comparison with the corresponding C18-C22 homopolymers. They even have a detrimental effect vis-à-vis the temperature of TLF distillates according to the invention.

The nature of the carboxylic acid is also an important parameter, the above described assays being carried out by substituting B1 with homopolymers of C12 methacrylic acid esters; C16 or C18-C24 show that they are not as effective than their counterparts obtained by homopolymerization of acrylic acid esters.

This example demonstrates that the necessary selection of the polyacrylates of the invention as a developer of the effectiveness of the filterability additives on the filterability temperature of the distillates of the type of the invention is not obvious in view of the art. prior. Only the synergistic combination of the composition according to the invention can solve the problem of lowering the TLF temperature of Tcc distillates greater than or equal to -5 ° C.

Claims

1. Use in a hydrocarbon distillate boiling point of between 150 and 450 ° C and crystallization temperature of incipient measured by ESR analysis Calorimetry Differential greater than or equal to -5 ⁰ C in preference ment of -5 ° C to + 10 ° C, a homopolymer obtained from an olefinic carboxylic acid ester of 3 to 12 carbon atoms and a fatty alcohol comprising a chain of more than 16 carbon atoms and optionally an olefinic double bond, as a compound for revealing the effectiveness of filterability additives based on copolymer and / or terpolymer of ethylene and vinyl ester of a carboxylic acid of 3 to 5 carbon atoms and a monohydric alcohol comprising from 1 to 10 carbon atoms,.

2. Use according to claim 1 wherein the hydrocarbon distillate comprises a content by weight of n-paraffins containing more than 18 carbon atoms greater than 4%.

3. Use according to one of the preceding claims wherein the hydrocarbon distillate comprises a content by weight greater than or equal to 0.7% of n-paraffins whose carbon number is greater than 24.

4. Use according to one of the preceding claims wherein the distillate comprises a mixture of 0.7 to 2% by weight of n-paraffins having a carbon number ranging from C24 to C40.

5. Use according to one of the preceding claims wherein the filterability additives are ethylene copolymers containing more than 20% of ester units.

6. Use according to one of the preceding claims, wherein the filterability additives are selected from copolymers of ethylene and vinyl acetate, ethylene and vinyl propionate ethylene and vinyl versatate, d ethylene and (alkyl) acrylates, ethylene and (alkyl) methacrylates, alone or as a mixture, comprising from 20 to 40% by weight of ester units.

7. Use according to one of the preceding claims, wherein said esters are of the vinyl acetate, vinyl propionate, vinyl versatate, (alkyl) acrylate and (alkyl) methacrylate, the alkyl group containing from 1 to 7 atoms of carbon.

8. Use according to one of the preceding claims, wherein the homopolymer is obtained by polymerization of an olefinic acid ester of acrylic acid optionally substituted with an alkyl group having 1 to 7 carbon atoms, and an alcohol comprising more than 16 carbon atoms, preferably 18 to 50 carbon atoms, the homopolymer having an average molecular weight in weight Mw between 5,000 and 20,000, preferably between 10,000 and 19,000.

9. Use according to one of the preceding claims, wherein the homopolymer is a polyacrylate comprising side hydrocarbon chains of 18 to 40 carbon atoms.

10. Use according to one of the preceding claims, characterized in that the distillate is selected from distillates of boiling temperature between 150 and 45O ⁰ C including distillates of direct distillation, distillates under vacuum, distillates hydrotreated, distillates resulting from catalytic cracking and / or hydrocracking of vacuum distillates, distillates resulting from conversion processes of the ARDS and / or visbreaking type, distillates derived from the recovery of Fischer Tropsch slices, and distillates resulting from distillation; BTL conversion of plant and / or animal biomass, and distillates containing alkyl esters of vegetable or animal oils, alone or as a mixture.

11. Composition comprising a mixture

A) a filterability additive based on copolymer and / or terpolymer of ethylene and vinyl ester of a carboxylic acid of 3 to 5 carbon atoms and a monoalcohol comprising 1 to 10 carbon atoms and

B) a homopolymer of an olefinic carboxylic acid ester of 3 to 12 carbon atoms and a fatty alcohol having more than 16 carbon atoms

A and B being in a ratio producing a synergistic effect with respect to the TLF filterability temperature measured according to the NF EN 16 standard, hydrocarbon distillates having a boiling point between 150 and 450 ° C. and an initial crystallization temperature. measured by differential scanning calorimetry greater than or equal to -5 ° C preferably from -5 to + 10 ° C.

12. A composition comprising (A) from 85 to 99% by weight of at least one filterability additive based on a copolymer and / or terpolymer of ethylene and a vinyl ester of a carboxylic acid of 3 to 5 carbon atoms. carbon and a monoalcohol comprising 1 to 10 carbon atoms, and (B) from 1 to 15% by weight of a homopolymer of an olefinic carboxylic acid ester of 3 to 12 carbon atoms and a fatty alcohol comprising more than 16 carbon atoms.

13. The composition of claim 11 or 12, wherein the homopolymer has a weight average molecular weight Mw between 5,000 and 20,000, preferably between 10,000 and 19,000.

14. Composition according to one of claims 11 to 13, wherein the homopolymer is an olefinic ester of acrylic acid with an alcohol comprising from 18 to 50 carbon atoms.

15. Composition according to one of claims 11 to 14, wherein the homopolymer is a polyacrylate comprising side hydrocarbon chains of 18 to 40 carbon atoms.

16. Composition according to one of Claims 11 to 15, in which the filterability additive is chosen from ethylene copolymers and terpolymers containing more than 20% of ester units, these ester units being themselves chosen from type esters. vinyl acetate, vinylpropionate, alkylacrylates and alkylmethacrylates, taken alone or as a mixture, the alkyl group containing from 1 to 7 carbon atoms.

17. Composition according to one of claims 11 to 16 wherein the filterability additives are selected from copolymers or terpolymers of ethylene and vinyl acetate, and / or vinyl propionate, and / or vinyl versatate , ethylene and / or (alkyl) acrylates, and / or (alkyl) methacrylates alone or in a mixture, comprising from 20 to 40% by weight of ester units.

18. Composition according to one of claims 11 to 17 wherein the filterability additives are selected from copolymers or terpolymers of ethylene and vinyl acetate, and / or vinyl propionate, and / or vinyl versatate , ethylene and / or (alkyl) acrylates, and / or (alkyl) methacrylates having a weight average molecular weight of between 3,000 and 20,000.

19. Composition according to one of claims 11 to 18, comprising

85 to 98% by weight of copolymers of ethylene and vinyl acetate comprising 25 to 30% by weight of vinyl acetate units and 2 to 15% by weight of polyacrylate comprising side hydrocarbon chains of 18 to 40 atoms carbon and average molecular weight ranging from 10,000 to 19,000.

20. A hydrocarbon distillate comprising from 0 to 5000 ppm of sulfur, containing from 10 to 5000 ppm of said composition according to one of Claims 11 to 18, optionally mixed with other detergent, dispersant and demulsifier additives, foams, biocides, resorbers, cetane improvers, anti-corrosions, friction modifiers, lubricity, combustion, cloud point, pour point, antisedimentation and conductivity improvers.

21. Distillate according to claim 20 comprising at least one hydrocarbon fraction derived from the group consisting of distillates with a boiling temperature of between 150 and 450 ° C, a starting crystallization temperature Tcc greater than or equal to -5 ° C, preferably between -5 ° C and + 10 ° C, including straight-run distillates, vacuum distillates, hydrotreated distillates, distillates from catalytic cracking and / or hydrocracking of vacuum distillates, distillates resulting from conversion processes such as ARDS and / or visbreaking, distillates from the valuation of Fischer Tropsch distillates resulting from the BTL conversion of plant and / or animal biomass, taken alone or in combination, and esters of vegetable and animal oils or their mixtures.

22. Distillate according to one of claims 20 to 21 comprising an n-paraffin content containing more than 18 carbon atoms greater than 4% by weight.

23. Distillate according to one of claims 20 to 22 comprising a content greater than or equal to 0.7% by weight of n-paraffins whose carbon number is greater than 24.

24. Distillate according to one of claims 20 to 23 comprising from 0.7 to 2% of n-paraffins having a carbon number varying from C24 to C40.

25. Diesel fuel comprising from 0 to 500 ppm of sulfur comprising at least one distillate according to one of the preceding claims 20 to 24.

26. A heating fuel oil comprising from 0 to 5000 ppm of sulfur comprising at least one distillate according to one of claims 20 to 24.

27. Heavy fuel oil comprising at least one distillate according to one of claims 19 to 23.