Fuel composition and use thereof

FIELD: chemistry.

SUBSTANCE: invention relates to a lead-free fuel composition which contains: (a) as its basic part a mixture of hydrocarbons in the petrol boiling range and (b) a small amount of a mixture of additives comprising (i) one or more compounds of p-alkoxy-N-alkylaromatic amine of general formula

I,

wherein R13 is hydrogen and R12 is a methyl, ethyl, propyl or butyl group, and (ii) one or more dicyclopentadienes; wherein components (b)(i) and (b)(ii) are present in the additive mixture in ratios ranging from about 1:19 to about 4:3. Also disclosed is a method of increasing the octane number of petrol, which includes adding small amounts of the disclosed additive mixture to the basic part of the petrol mixture. Described is a method of reducing deposits in the inlet valve of an internal combustion engine, which includes burning the disclosed fuel composition in said engine.

EFFECT: use of said additive mixture in a lead-free fuel composition increases the octane number of motor fuel and reduces deposits in the inlet valve of an internal combustion engine by burning the disclosed lead-free fuel composition.

8 cl, 2 dwg, 3 tbl, 5 ex

 

The technical field to which the invention relates.

The present invention relates to gasoline compositions and its use, in particular in combustion engines.

The level of technology

Gasoline internal combustion engines with spark ignition require fuel with a low octane number, which depends on the design of the engine. If this engine runs on gasoline with an octane rating below the minimum required level for the engine, there are "knock". Usually "knock" occur when the fuel, in particular gasoline, spontaneously and prematurely ignites or detonates in the engine before ignition initiated by the spark plug. This phenomenon can also be described as inhomogeneous formation of free radicals, which ultimately interact with the wave front of the flame. To have a high enough octane to work on modern vysokokonversionny engines, gasoline can be cleaned, but this treatment is expensive and requires large expenditures of energy. To increase the octane number of at low cost, has developed a number of metallic fuel additives which, when added to gasoline to increase its octane characteristics and, consequently, have an effect of suppressing detonation engines who I am. However, the problem with metal antiknock additives for gasoline fuels is their high toxicity of combustion products. For example, the products of thermal decomposition polyallylamine, often tetramethyl - and tetraethyl lead are lead and lead oxides. All of these metallic octane additives were banned nationally as products of their oxidation give the metal lead and various salts of lead oxides. Lead and lead oxides are potential neurotoxins and in gaseous form for car exhaust become neuroactive.

In addition, there is a constant search for improving the efficiency of combustion in gasoline engines. Thermal efficiency is functionally working four-stroke engine developed by Nikolaus Otto ("the engine Otto cycle") is directly related to the compression ratio and ignition advance. The higher the compression ratio and the closer the ignition advance to the position of maximum braking torque, the higher efficiency of the engine. The engine technology is currently limited by the presence of non-metallic octane additives. For the production of high-octane fuel in refineries require a significant amount of high-octane blending components. In fact, the limitation is to be placed in the legislation on the use of aromatics, MTBE and EtOH increase the difficulties, costs and stiffness conditions of treatment operations for producing high-octane fuels.

Disclosure of inventions

According to some aspects of the present invention, in one of its embodiments is proposed gasoline composition comprising: (a) as its main parts a mixture of hydrocarbons within the gasoline boiling and (b) a small amount of the mixture of additives containing (i) one or more p-alkoxy-N-alkylaromatics amino compounds and (ii) one or more Dicyclopentadiene.

In another embodiment, the present invention proposes a method of improving the octane number of gasoline, which comprises adding to the main part of the gasoline mixture a small amount of the mixture of the above additives.

In yet another embodiment, the present invention proposes a method of operating a spark-ignition engine, comprising a combustion in the specified engine described above, the fuel composition.

Brief description of drawings

Fig.1 is a view of the difference in values research octane number (IOC) between the base fuel and the predicted and actual values of each of examples 1-3.

Fig.2 is a view of the difference in the values of the motor octane number (MOC) between the base fuel and predicted, and t is the train real values of MACH of examples 1-3.

The implementation of the invention

We have found that the above-described mixed fuel composition significantly increases the octane number of gasoline fuels with non-metallic compounds at much lower levels introduced additives compared to conventional mixed components in oil refineries. It was found that some of the mixture components, (b) (i) and (b) (ii), a synergistic increase the octane number. Fuel, effectively increasing the resistance to autosplitting, provides significant economic benefits.

Lead-free fuel composition of the present invention contains as component (b) (i) at least one of the defined p-anisidino. p-Alkoxy-N-alkylaromatic amines can be represented by the compounds of the formula:

The formula I

in which R13and R12independently represent hydrogen, methyl, ethyl, sawn or boutelou group provided that (a) if R13is hydrogen, R12is methyl, ethyl, sawn or butilkoi group, and (b) if R12is hydrogen, R13is methyl, ethyl, sawn or butilkoi group. Sawn and bucilina group can be n - and ISO-isomers.

These p-alkoxy-N-alkylaromatic the amino compounds get is from Sigma-Aldrich Inc. and Alfa inc. To get suitable for the invention of the p-alkoxy-N-alkylaromatic amino compounds can be used in a variety of synthetic routes. For example, in the case of p-anisidine it is possible to mixture of nitric and sulfuric acid are slowly added under stirring at a temperature of from 0 to 5°C p-methoxybenzoyl. The resulting mixture, which consists mainly of p-methoxyethanol, collect and enter into reaction with hydrogen in the presence of Nickel Raney at moderate pressure and 50-110°C, after which it can be allocated formed p-methoxyaniline. To get suitable for the invention of the p-anisidino compounds can be used and other methods known to experts in the field of organic synthesis.

p-Alkoxy-N-alkylaromatic the amino compounds can be, for example, presents p-anisidine (p-methoxyaniline), p-methoxyaniline and p-aminoanisole.

Lead-free fuel composition of the present invention contains as component (b) (ii) cyclopentadiene. The cyclopentadiene may be unsubstituted or substituted alkyl substituent. In a preferred cyclopentadiene includes compounds having the General formula:

Formula II

in which

R1-R11independently represent hydrogen, methyl, ethyl or through group provided the (a) if one of R 1-R11is stands, the other R1-R11include one more methyl group, and the remainder are hydrogen atoms, or are all hydrogen atoms and (b) if one of R1-R11is ethyl or through the group, the other R1-R11are hydrogen atoms. The Dicyclopentadiene receive from Sigma-Aldrich Inc. and Alfa inc., Shell Chemical and Dow Chemical. To get suitable for the invention of Dicyclopentadiene can be used different synthetic route. For example, Dicyclopentadiene in the Diels-alder reaction left to slowly warm to room temperature over night, getting white crystals, which separate receiving Dicyclopentadiene. The Dicyclopentadiene is also a byproduct in the production of ethylene by the method of distillation of pyrolysis gasoline from refineries. For preparation suitable for the invention Dicyclopentadiene compounds can be used and other methods known to experts in the field of organic synthesis. The most preferred of them Dicyclopentadiene.

Components (b) (i) and (b) (ii) may be contained mainly in the mass ratio of from 1:19 to 4:3, preferably from 1:9 to 6:4 and more preferably from 1:9 to 5:5.

Suitable liquid hydrocarbon fuels boiling within the be the Zina is a mixture of hydrocarbons, having the limits boiling point from about 25°C. to about 232°C and containing a mixture of saturated hydrocarbons, olefinic hydrocarbons and aromatic hydrocarbons. Preferred gasoline mixture having a content of saturated hydrocarbons in the range from about 40 to about 80 vol.%, the content of olefinic hydrocarbons in the range from 0 to about 30% vol. and the content of aromatic hydrocarbons in the range from about 10 to about 60 vol.%. The base fuel is obtained on the basis of gasoline direct race, polymer gasoline, dimer, and trimeridian olefins, synthetically produced mixtures of aromatic hydrocarbons or catalytically or thermally recerving of crude oil and mixtures thereof. Hydrocarbon composition and octane number of the base fuel are not critical. Usually octane number, (IOC+MAC)/2, is approximately 85. In the practice of the present invention can be used with any traditional basis of motor fuel. For example, the hydrocarbons in gasoline can be replaced by a significant number of traditional alcohols and ethers, which are usually used in fuels. Preferably, the base fuel is not essentially contained water, because water can disrupt the smooth burning.

Typically, the hydrocarbon fuel mixture, to which the present invention is applicable, turn the key do not contain lead, but can in small amounts (from about 0.1 to about 15 vol.% from the base fuel) to contain the components of the mixture such as methanol, ethanol, ethyl tert-butyl ether, methyl tert-butyl ether, methyl tert-amyl ether, etc. But they can also be used in large quantities. Fuel may also contain conventional additives, including antioxidants such as phenolic antioxidants, such as 2,6-di-tert-butylphenol, or phenylendiamine, for example N,N'-di-sec-butyl-p-phenylenediamine; dyes; decontamination officers metals; additives to eliminate water haze, such as polyester-type ethoxylated alkylphenolethoxylate resin. May also be present in amounts from about 1 to about 1000 mass. ppm corrosion inhibitors, such as ethers of polynuclear alcohol derivative of succinic acid in which at least one alpha-carbon atoms is unsubstituted or substituted hydrocarbon group having 20 to 50 carbon atoms, for example fluids of pentaerythritol with polyisobutylene succinic acid, which polyisobutylene group has an average molecular weight of about 950.

An effective amount of one or more compounds of formula I and formula II is introduced in various ways into the zone of combustion of the engine in order to increase the octane number and/or before the rotation slew of sediments, or to reduce deposits in the intake valve, or for transformation of an already existing deposits, which are relevant to the requirements of octane numbers. As already mentioned, the preferred method is to add a small amount of one or more compounds of formula I and formula II fuel. For example, a small amount of one or more compounds of formula I and formula II can be added to the fuel directly or mixed with one or more carriers and/or one or more additional detergents with the formation of concentrate supplementation, which can then be added to the fuel at a later point in time.

The number of Dicyclopentadiene and p-alkoxy-N-alkylaromatic amine will depend on the specific variations in the formula I and formula II, engine, fuel, and the presence or absence of carriers and additional detergents. Generally, each compound of formula I is added in an amount up to about 5 wt.%, in particular from about 4 wt.%, more preferably from about 3 wt.% and, even more preferably from about 2 wt.% to about 1 wt.%, more preferably up to about 0.5 wt.% and, even more preferably up to about 0.4 wt.% calculated on the total weight of the fuel composition. Generally, each compound of formula II is added to Koli is este to about 5 wt.%, in particular from about 4 wt.%, more preferably from about 3 wt.% and, even more preferably from about 2 wt.% to about 1 wt.%, more preferably up to about 1 wt.% and, even more preferably up to about 0.1 wt.% calculated on the total weight of the fuel composition. The total amount of the present compounds of formula I and formula II is up to about 5 wt.%, in particular from about 4 wt.%, more preferably from about 3 wt.% and, even more preferably from about 2 wt.% to about 1 wt.%, more preferably up to about 0.75 wt.% and, even more preferably up to about 0.5 wt.% calculated on the total weight of the fuel composition.

The fuel compositions of the present invention may also contain one or more additional detergents. When using extra detergent fuel composition will contain a mixture of the principal amount of the above hydrocarbons within the gasoline boiling, a small amount of one or more of the above described compounds of formula I and formula II and a small amount of one or more additional detergents. As mentioned above, may also be included above the media. According to the present invention, the expression "small amount" implies less than 10 wt.% from all of the fuel components is icii, mostly less than 1 wt.% from all fuel composition and, more preferably, less than 0.1 wt.% from all of the fuel composition. However, the expression "small amount" must contain at least a certain number of, predominantly, at least 0.001 wt.% and, more preferably, at least 0.01 wt.% from all of the fuel composition.

One or more additional detergents are added directly to the hydrocarbon or before adding to the hydrocarbon is mixed with one or more carriers, is mixed with one or more compounds of the formula I and/or formula II or mixed with one or more compounds of the formula I and/or formula II and one or more carriers. The compounds of formula I and formula II can be added at the refinery, terminal, retail enterprise or consumer.

The rate of addition of the fuel additive is a detergent packages that contain one or more additional detergents, in the final fuel composition is generally in the range from about to 0.007 to about 0.76 wt.% in the calculation of the final fuel composition. Fuel filler-detergent package can contain one or more detergents, additives to eliminate water haze, corrosion inhibitor, and solvent. To facilitate preventing said the project intake valve at low temperatures, in some cases, in addition to the media can be added fluidization.

Deposits in the intake valve in an internal combustion engine can be reduced through the use of combustion in this engine a fuel composition containing (a) as its main parts a mixture of hydrocarbons within the gasoline boiling and (b) a small amount of an additive having the formula I and formula II.

Although the invention may have various modifications and alternative forms, with details described here are examples of specific ways of implementation. It should be borne in mind, that the detailed description is not intended to limit the invention disclosed specific form, but, on the contrary, it is supposed to cover all modifications, equivalents and alternatives within the essence and scope of the present invention defined in the attached claims. The present invention is further illustrated by the following illustrative embodiment, which is given only as an illustration and in any case not intended to be a limitation of the claimed invention.

Methods of test for octane

Research octane number (IOC) (ASTM D2699) and motor octane number (MOC) (ASTM D2700) are tools used to increase the octane number of the fuel (IOC+MAC)/2. IOC and Mactopia engine with spark ignition are determined using standard testing engine and operating conditions for comparison detonation characteristics fuel characteristics of primary reference fuel mixtures of known octane number. To obtain the standard knock intensity at the sample of the fuel, measured using a special electronic instrument system for measuring detonation, adjusts the compression ratio and fuel-air ratios. In the reference table for standard knock intensity is given against the compression of the engine to the value of the octane number for this particular method. A specific methodology for each can be found in ASTM D-2699 and for MAC can be found in ASTM D-2700. Table 1 shows conditions of the engine needed to determine IOC, MAC fuel.

Table I
Conditions for testing IOC, MAC
Conditions of the test engineResearch octane numberMotor octane number
Test methodASTM D-2699-92ASTM D-2700-92
EngineCooperative Fuels Research (CFR)Cooperative Fuels Research (CFR)
The engine speed 600 rpm900 rpm
The temperature of the incoming airVaries with barometric pressure (88 kPa and 19.4°C, to 101.6 kPa - 52,2°C38°C
The humidity of the incoming air3,56-7,12 g H2O/kg dry air3,56-7,12 g H2O/kg dry air
The temperature of the incoming mixtureis not set149°C
Cooler temperature100°C100°C
Oil temperature57°C57°C
Set the ignition advance13 degrees before top dead centerChanging the compression ratio (14-26 degrees before top dead center)
Diffuser carburetorIs set according to the height of the engine (0-500 m m=14,3 mm; 500-1000 m m=14,3 mm)14,3 mm

Basic fuel

Used in the testing of the base fuel was a regular base fuel 87 R+M/2. Fizi the definition of the properties of the base fuel are given in table II.

Table II
Physical properties of the base fuel
API-density61,9
The steam pressure on Reid13,45
Distillation (°C)
Initial boiling point30,61
10%41,83
20%50,67
30%60,16
40%71,94

50%85,5
60%103,39
70%126,78
80%153,67
90%176,11
95%192,94
End of boil223,72
% extract97,2
% residue1,1
% loss1,7
Flow-injection analysis (vol.%)
Aromatics28
Olefinsa 12.7
Saturated hydrocarbons59,3
Resin (mg/100 ml)
neochmia3
MOC81,9
IOC92
(IOC+mon)/287
Oxygenatesno

Examples 1-3 and comparative examples 1-2

Each of the antioxidants are added to a gallon base fuel with 87 octane in the amount of 0.5 wt.% (of 14.25 g) in accordance with table 3. Individual supplements three times experience on IOC, MAC. The graph on the figure details the improvement in the average octane number (IOC+MAC)/2 of the examples.

Table III
Example No.Additive (wt.%)The amount of additive (wt.%)
Comparative example 1p-anisidin0,5
Comparative example 2The Dicyclopentadiene0,5
180% p-anisidine 20% Dicyclopentadiene0,5
250% p-anisidine 50% Dicyclopentadiene0,5
320% p-anisidine 80% Dicyclopentadiene0,5

The figure details the results of several anti-knock additives under different rules add and increase their average octane base fuel with an octane rating of 87. Average antiknock results on each shown in Fig.1. Average antiknock results of MOC shown in Fig.2. As follows from the figures, a mixture of Dicyclopentadiene and p-anisidine have a synergetic property compared with Dicyclopentadiene and p-anisidin the m separately.

More specifically, in Fig.1 shows the difference in values research octane number (IOC) between the base fuel and the predicted and actual values of each of examples 1-3. As you can see, the combination of Dicyclopentadiene and p-anisidine (p-methoxyaniline) unexpectedly results in improved outcome. Fig.1 represents the difference in the values of the motor octane number (MOC) between the base fuel and the predicted and actual values of MACH of examples 1-3. As you can see, the combination of Dicyclopentadiene and p-anisidine (p-methoxyaniline) unexpectedly results in improved result.

1. Lead-free fuel composition comprising: (a) as its main parts a mixture of hydrocarbons within the gasoline boiling and (b) a small amount of the mixture of additives containing (i) one or more compounds having the formula:

in which R13denotes hydrogen, and R12denotes methyl, ethyl, sawn or boutelou group;
and
(ii) one or more Dicyclopentadiene;
in which the components (b) (i) and (b) (ii) are present in a mixture of additives in proportions ranging from about 1:19 to about 4:3.

2. Fuel composition under item 1, in which the mixture of additives contained in an amount of from 0.01 to 5 wt.% by weight of the total fuel.

3. Fuel composition under item 1, in which component (b) (i) and (b) (ii) are present in a mixture of additives in ratios ranging from 1:9 to 5:5.

4. Fuel composition under item 1, in which (b) (i) contains p-anisidin.

5. Fuel composition according to any one of paragraphs.1-4, in which R12is a methyl group.

6. Method of improving the octane number of gasoline, which comprises adding to the main part of the petrol mixture of small amounts of p-alkoxy-N-alkylaromatic the amino compounds having the formula:

in which R13denotes hydrogen, and R12denotes methyl, ethyl, sawn or boutelou group;
and at least one Dicyclopentadiene;
in which p-alkoxy-N-alkylaromatic aminosidine and Dicyclopentadiene containing additives in the mixture in proportions ranging from about 1:19 to about 4:3.

7. The method according to p. 6 which includes the p-alkoxy-N-alkylaromatic aminosidine and Dicyclopentadiene are contained in amounts from about 0.01 to 5 wt.% from the total mass of gasoline.

8. A method of reducing deposits in the intake valve in an internal combustion engine which comprises burning in the specified motor fuel composition according to any one of paragraphs.1-5.



 

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FIELD: chemistry.

SUBSTANCE: invention describes a unitary fuel, which consists of a liquid oxidant and inflammable substances, enclosed in granules with a shell from a solid polymeric material. The granules of the fuel contain polymeric materials in a mixture with metal hydrides or carbon in different modifications. The unitary fuel is intended for rocket engines and can be also applied for burners, applied in different technological processes, connected with the extraction of viscous and polluted with sand mineral oil, with the penetration of rocks, with the formation of openings, pit-holes and etc. in them.

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1 tbl, 3 ex

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16 cl, 10 dwg, 7 ex, 6 tbl

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1 cl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to novel areas of using a certain type of diesel fuel component and methods of improving performance of a turbo charged diesel engine. In particular, the invention relates to use of a viscosity increasing component in a diesel fuel composition to improve acceleration performance, at low engine speeds from 1200 to 2200 rpm, of a turbo charged diesel engine into which the fuel composition is added or will be added, or a vehicle driven by said engine. The invention also relates to a method of operating a turbo charged diesel engine and/or a vehicle driven by such an engine, which involves feeding a diesel fuel composition, containing said viscosity increasing component, into the engine.

EFFECT: improved performance of a turbo charged diesel engine.

12 cl, 22 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a composition of lead-free ecologically clean high-octane petrol based on an isomerisation product and catalytically cracked petrol, characterised by that it further contains straight-run petrol, and the high-octane component is a hydrogenation product from production of butyl alcohols, with the following ratio of components, wt %: straight-run petrol - 10-15; isomerisation product - 2.5; hydrogenation product from production of butyl alcohols - 20-60; catalytically cracked petrol - up to 100.

EFFECT: practical use of the disclosed composition significantly widens the raw material base for producing ecologically clean petrol, having high octane number and low content of aromatic and olefin hydrocarbons and benzene.

2 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a fraction of polymethyl-substituted C18-C36 alkanes of formula: , where n=4-10 by reacting molten atactic polypropylene with atmospheric oxygen at 150-250°C for 1-6 hours with air flow rate of 0.6-1.9 l/min∙kg using secondary low-molecular oxidation products as raw material. The method is characterised by that first, low-molecular products are fractionated collection of the basic fraction at 200-310°C followed by catalytic hydrofining from impurities of alkenes in gas phase or oxidation of alkenes at 100°C with aqueous solution of KMnO4 with weight ratio of the fraction to KMnO4 of 2.5-3.0:1.0, followed by freezing the organic layer at minus 20°C and separating the crystalline water-containing precipitate. The invention also relates to use of said fraction as a chemical marker for hydrocarbon fuels.

EFFECT: disclosed marker has a low cost and high concealment.

2 cl, 5 ex, 1 tbl, 4 dwg

FIELD: chemistry.

SUBSTANCE: gasoline composition primarily consists of gasoline and also includes 1-5 wt % base oil, with respect to the entire gasoline composition, the base oil having kinematic viscosity at 100°C of at least 1 cSt. The invention also relates to a method of operating a spark-ignited four-stroke internal combustion engine, involving feeding a gasoline composition into the combustion chamber of said engine, said composition primarily containing gasoline and 1-5 wt % base oil with respect to the entire gasoline composition. Also described is a gasoline composition for a four-stroke engine, primarily containing gasoline and 1-5 wt % base oil, with respect to the entire gasoline composition, the base oil being based on liquid hydrocarbons and having kinematic viscosity at 100°C of at least 1 cSt.

EFFECT: improved accelerating power of a spark-ignited four-stroke internal combustion engine.

11 cl, 6 tbl, 22 ex

FIELD: oil and gas industry.

SUBSTANCE: invention refers to fuel for detonation kick motor on the basis of synthetic high-density fuel T-10, which differs by the fact that in order to increase its detonation activity, prodetonator - butylhydroperoxide (wt %) is added additionally to the fuel: fuel T-10 99 - 99.3%; tert-butylhydroperoxide 0.7-1%.

EFFECT: creation of fuel for detonation kick motor with increased sensitivity to detonation pulse and improved conditions of its detonation combustion in the chamber of detonation kick motor at introduction to it of tert-butylhydroperoxide as a prodetonator.

FIELD: chemistry.

SUBSTANCE: present invention relates to use of at least one oil-soluble olefin copolymer B), which acts as a nucleating agent for paraffin crystallisation for improving response of additives C) for improving cold flow of mineral oil, different from B), in middle distillates which contain at least one ash-free, nitrogen-containing detergent additive A), which is an oil-soluble amphiphilic compound which contains at least one alkyl or alkenyl radical bound to a polar group, said alkyl or alkenyl radical having 10-500 carbon atoms and the polar group having 2 or more nitrogen atoms. The additives C) used to improve cold flow contain oil-soluble polar nitrogenous compounds. The present invention also relates to an additive for middle distillates and a middle distillate having sulphur content lower than 100 ppm and 90% final boiling point lower than 360°C.

EFFECT: present invention provides use of oil-soluble olefin copolymers as nucleating agents for paraffin crystallisation in order to prevent deterioration of efficiency of traditional additives for improving cold flow under the action of nitrogen-containing detergent additives.

26 cl, 47 ex, 4 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to use of at least one oil-soluble compound B) which acts as a nucleating agent for paraffin crystallisation and is selected from essentially linear hydrocarbons having at least 20 carbon atoms in order to improve response of additive C), which improves cold flow of mineral oil in middle distillates which contain at least one ash-free nitrogen-containing detergent additive A) which is an oil-soluble amphiphilic compound which contains at least one alkyl or alkenyl radical bound to a polar group, the alkyl or alkenyl radical containing 10-500 carbon atoms and the polar group containing 2 or more nitrogen atoms. The present invention also relates to an additive for middle distillates and a middle distillate having sulphur content lower than 100 ppm and 90% final boiling point lower than 360°C.

EFFECT: use of oil-soluble compounds as nucleating agents for paraffin crystallisation in order to prevent deterioration of efficiency of traditional additives for improving cold flow under the action of nitrogen-containing detergent additives.

24 cl, 45 ex, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to application of reaction product (i), of compound, containing fragment -NR1R2, where R1 represents group, containing from 4 to 44 carbon atoms, and R2 represents hydrogen atom or group R1, and (ii) carboxylic acid, containing from 1 to 4 carboxylic groups, or said acid anhydride, or said acid chloride as additive for improvement of Bx fuel filterability at temperatures high than temperature of Bx fuel turbidity. Bx fuel includes fuel, obtained from sources, containing animal or vegetable oils, mixed with fuel, obtained from mineral or synthetic sources. Sulphur content in Bx fuel constitutes less than 200 ppm. Bx fuel contains at least 4 wt % of fuel, obtained from sources of animal or vegetable origin. Content of additive in Bx fuel (in form of active material) constitutes from 10 mg/kg to 200 mg/kg. Invention also relates to method of giving Bx fuel improved filterability at temperatures higher than temperature of its turbidity by inclusion into it of fuel additive, representing disclosed above product of reaction of (i) and (ii) compounds.

EFFECT: additives make it possible to eliminate problems in Bx fuels, caused by precipitation, taking place at temperatures higher than temperature of turbidity.

15 cl, 2 tbl, 2 ex

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