DE1545508B1 - Anti-icing additive for motor fuels - Google Patents

Description

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The invention relates to an anti-icing additive for malformations for each property to be improved Motor fuels used on the basis of a mixture stick- a specific additive. So is for example Substance-containing compounds. It is indicated for use in an alcohol-based anti-icing additive Fuels or fuels for carburetor internal combustion, which aims to keep the freezing point of the machines provided and shows pronounced synergistic 5 degrade water and spread water droplets Effects to improve anti-freshness dissolve and remove. Next are different Solution properties and cleaning properties Phosphate salts of amines as additives for gasoline of motor fuels, d. That is, it leads to an essential being called, usually again each greater improvement in properties than that of a specific type of phosphate amine salt for based on the results of an application of each io, a specific purpose has been suggested. Component of the mixture alone can be expected.Furthermore, an additive is against accidental

could. Allowing the engine to stand has been described (USA.-

A common difficulty in operating Patent 3,130,018), the (1) 20 to 50 weight of automobiles, is exposure or percent stagnation of an amine salt of a branched chain engine due to the formation of ice 15 primary aliphatic orthophosphoric acid alkyl in the carburetor throttle body or on the throttle plate. esters in which each esterifying alkyl group contains 8 to This occurs particularly at outside temperatures in the range 16 carbon atoms and the amine from one of about -1 to about 16 ° C in the course of weather aliphatic hydrocarbon monoamine with 6 to periods of relatively high humidity at 18 carbon atoms and (2) 80 to 50 Ge operation of the machine at idle or with less than 20 weight percent of an N-tert-alkyl-alkanesulfonamide load. The reason for this is a freezing of the structure in the RSO ₂ NHR ', in the R an alkyl moisture contained in the air as a result of the cooling group with 12 to 20 carbon atoms or an effect in normal fuel evaporation in the chloroalkyl group with 12 to 20 carbon atoms in carburetors. That on the throttle valve and adjoining and R 'includes a tertiary alkyl group with 8 carbon atoms formed up to the carburetor walls, or a mixture that blocks the narrow air openings and thus causes alkanesulfonamides. Since with a two the engine stops. or multi-component additive has a synergistic effect

The icing problem gets with more modern just on the special combination of the composite motor vehicles increasing importance. The individual components can be based on examples wise, more modern motor vehicles do not have a hand throttle 30 which cannot be viewed in isolation from one another. this applies more, and accordingly it is for the driver of the car for both the known additive and the more difficult to use the idle additive according to the invention during the warm-up period. A use of Maintain speed and a standing- N-tert-alkyl-alkanesulfonamides or mixtures to prevent staying of the engine. In addition, such alkanesulfonamides and thus one of the amounts The increasing use of automatic, comparable combinations of substances also comes into play table power transmission devices to these the additive according to the invention not into consideration. Difficulties with, since there the idle speed also convey the information about the known speed must be kept low in order to prevent creep, additive no stimulation in the direction of Ausd. H. a slow forward movement of the carriage, formation of an additive according to the rules of the inventor avoid. Accordingly, the idle 40 or any reference to its particular is often sufficient speed does not stop at the benefits of a synergistic effect for two To prevent the engine from icing up. Another essential fuel properties Another aspect is the increasing volatility. Surprisingly, it has now been found that a

from commercial gasoline; it has been shown to be a mixture of alkyl phosphate salts of an N-alkyldidass in combination with fuels of higher volatile 45 aminoalkanes and an alkyl monoamine in synergy Such engine stalling more often affects both anti-icing properties occurs. as well as the cleaning properties of an engine

Another difficulty in the operation of carburetor fuels significantly beyond the scope of combustion engines is the formation of filing better, based on the results with separated stanchions on the walls of the carburetor. Which was to be expected in the application of these alkyl phosphate salts. The course of time accumulating deposits. The object of the invention is accordingly an anti

prevent the proper operation of the throttle icing additives for motor fuels based on Plate and / or clog the idle nozzles and a mixture of nitrogenous compounds, which are the cause thereby a stalling of the engine or ches is characterized in that it consists of a other undesirable phenomena. This applies to a synergistic mixture of 5 to 95 percent by weight especially for taxis or similar motor vehicles, with an alkyl phosphate salt of an N-alkyldiaminoaldene the engine often idles for a long time kans (A) and 95 to 5 percent by weight of an alkyl leaving will. When idling for a long time, the phosphate salt of an alkyl monoamine (B) is impurities contained in the fuel Preferred characteristics with regard to the alkylphosphorus

or got in from the atmosphere, on the wall-phatamine salts, their proportions in the mixture that of the carburetor. The more recently mentioned etc. are discussed in more detail below, coming arrangement of crankcase valve- It was unforeseeable and is very over-

tion facilities in which the crankcase surprisingly that the association of an additive that Blow-through gases are passed through the carburetor, poor or only moderate anti-icing effect increases the formation of carburetor deposits in star- 65, with another additive that is slightly better core dimensions. until has good anti-icing effect, to a mixture

There are numerous fuel additives that could lead to a reduction in the amount of energy that goes well beyond this these difficulties have been stated. Has a standardized anti-icing effect. In anticipation

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Licher way it was not foreseeable and is contained in ortho- and pyrophosphates, something like surprising that the combination of an additive is commercially available as a mixture of acidic mono- and diringer or moderate cleaning action with an alkyl phosphate at a relatively low price Additively better, but also retained, exist.

A limited cleaning effect to a mixture 5 In the alkyl phosphate component of the salts can

with far better cleaning effect than even the cyclo-

better component could result. From the post-alkyl group, z. B. cyclobutyl, cyclopentyl,

The examples below show that the invention cycloheptyl, cyclooctyl groups and the like, in particular

according to the intended mixture, this unexpected one cyclohexyl group. The aliphatic odsr cycli-

brings synergistic effects. These io see groups can be hydrocarbon or

surprising improvement in both anti-non-hydrocarbon substituents, e.g. B. hydroxyl

ice and cleanliness properties are groups, alkoxy groups or the like, included,

to be regarded as a double synergistic effect. For the alkyl monoamine alkyl phosphate salt containing the

The processes on which the synergistic effect forms component (B) of the additive mixture come about

of the mixture are not known and two numerous alkyl monoamines are possible. The alkyl

J os of a complicated kind. Monoamin appropriately contains about 3 to 20 carbon

The alkyl phosphate salts can contain various Al atoms, preferably about 4 to 12 carbon

Kylphosphate as an acidic component of the salt entatome, so it belongs to the range of butylamine bis

keep, being same or different alkylphos-dodecylamine including. The alkyl radical can be a

phate in the diamine salt and the monoamine salt 20 have straight or branched chain and pri-

may exist. Both acidic alkyl, secondary or tertiary configurations are possible,

orthophosphates and acidic alkyl pyrophosphates. 2-Ethylhexylamine is particularly preferred. Other

into consideration. In the case of the acidic alkyl orthophosphates, the so-called alkyl monoamines are preferred

can it be monoalkyl esters, dialkyl esters or /? - amines in which the alkyl group via its /? - carbon

Mixtures thereof, in the case of the acidic alkyl pyrophosphorus atom being bonded to the nitrogen atom.

phate to monoalkyl esters, dialkyl esters, trialkyl esters Also for the N-alkyldiaminoalkane, whose alkyl

or mixtures thereof. In the case of alkyl pyrophosphate salt, the active component (A) of the additive

The dialkyl esters are preferred for phate salts; the mixture forms numerous compounds

Ester groups can be the same or different. The diamine can be about 3 to 40 and

which phosphorus atoms are bonded, preferably 30 preferably contain about 8 to 20 carbon atoms,

if the symmetrical compounds are used, preference is given to N-alkyldiaminoalkanes in which

in which the alkyl ester groups are different from the alkyl radical about 3 to 30 and in particular about 6 to

Phosphorus atoms are bonded. 20 carbon atoms and the alkane content about 2 to

Preferred acidic alkyl orthophosphates and -pyro- 12 and especially about 3 to 6 carbon atoms are

Phosphates contain alkyl radicals with about 3 to 20 35 holds each. N-alkyl-1,3-di-

and especially about 4 to 15 carbon atoms. aminopropane, especially those with which

Particularly preferred acidic alkyl orthophosphates are the alkyl group derived from tallow (hereinafter referred to as

z. B. acid monobutyloithophosphate, acidic di-N-tallow-1,3-diaminopropane). Also N-Al-

butyl orthophosphate, mixtures of acidic mono-alkyl l, 3-diaminopropanes, in which the alkyl

and dibutyl orthophosphates, acid monopentyl group of lauric acid, coconut fatty acid, soy

orthophosphate, acidic dipentyl orthophosphate, fatty acid, etc. are well suited. Such

Mixtures of mono- and dipentyl orthophos acidic materials are commercially available and include

phate, acidic monohexyl orthophosphate, acidic di-mixed alkyl substituted 1,3-diaminopropane. at

hexyl orthophosphate, mixtures of acidic mono- an N-tallow-1,3-diamino-

and dihexyl orthophosphates and the corresponding acidic 45 propane contains, for example, the alkyl group about 12

Monoalkyl, dialkyl and mixed mono- and di- up to 20 and mostly 16 to 18 carbon atoms. The Al-

alkyl orthophosphates up to acidic pentadecyl alkyl group of N-alkyl-1,3-diaminopropane or other

orthophosphate, acidic dipentadecylorthophosphate ren N-alkyldiaminoalkane can also be another

and mixtures of acidic mono- and dipentadecyl carbon numbers, preferred are groups

orthophosphates. The alkyl radical can be straight-chain 50 pen from the series from hexyl to eicosyl including,

or be branched and primary, secondary or mixtures of N-alkyldiaminoalkanes with

have tertiary configuration. different alkyl groups are used,

Preferred acidic alkyl pyrophosphates are, for. B. and the alkyl and alkane radicals can be straight-chain

acid monobutyl pyrophosphate, acid dibutyl pyro or branched chain. The alkyl portion can

phosphate, mixtures of acidic mono- and dibutyl- 55 have primary, secondary or tertiary configuration,

pyrophosphates, acidic monopentyl pyrophosphate, the (β-amines,

acidic dipentyl pyrophosphate, mixtures of acidic in which the alkyl groups via their / 3-carbon

Mono- and dipentyl pyrophosphates as well as the entatoms are bound to the nitrogen atoms,

speaking acidic monoalkyl, dialkyl and ge As examples of other suitable N-alkyl-diamino-

mixed mono- and dialkyl pyrophosphates up to 60 alkanes may be mentioned: N-alkyl-1,2-diaminoethanes,

to acid monopentadecyl pyrophosphate, acidic di- N-alkyl-1,2-diaminopropane, N-alkyl-1,2-diamino-

pentadecyl pyrophosphate and mixtures of acid butanes, N-alkyl-l, 3-diaminobutane, N-alkyl-l, 4-di-

Mono- and dipentadecyl pyrophosphates. Here, too, aminobutane, N-alkyl-l, 2-diaminopentane, N-alkyl-

it applies that the alkyl radical is straight-chain or branched-chain 1,3 - diaminopentane, N - alkyl -1,4 - diaminopentane,

and of primary, secondary or tertiary configuration- 65 N-alkyl-l ^ -diaminopentane, N-alkyl-l, 2-diamino-

ration can be. hexane, N-alkyl-l ^ -diaminohexane, N-alkyl-l, 4-di-

The alkyl phosphate component of the salts can also be aminohexanes, N-alkyl-l ^ -diaminohexanes, N-alkyl-

from acidic alkyl phosphate mixtures containing both 1,6-diaminohexane.

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The alkyl monoamine and / or the N-alkyl diamino paraffinic hydrocarbons, such as pentane, hexane, alkane can have a double bond in the alkyl group heptane, octane, nonane, decane or mixtures thereof, contain. Furthermore, the alkyl group of carbon and mixtures of such aromatic and paraffinic hydrogen radicals various substituents entic hydrocarbons.

hold, e.g. B. Hydroxyl, alkoxy, N-dihydrocarbyl 5 If prepared separately, the alkylphosamide or halogen groups, especially chlorophate salt of the alkyl monoamine and the alkyl phosphate or fluorine. In the case of the amine, instead of the salt of the N-alkyldiaminoalkane, it can become an additive Presence of an open-chain aliphatic mixture combined or separated from the motor fuel Group to act as a cyclic amine, e.g. B. Cyclo- are added. In any case, a quantity of hexylamine, Dicyclohexylamine and cyclohexyldiamino- io ratio in the range from 5 to 95 percent by weight alkane, or the cycloalkyl group can be selected from one of the salts and 95 to 5 percent by weight of the Cyclobutyl, cyclopentyl, cycloheptyl, cyclooctyl other salt complied. Sometimes there is a supergroup etc. exist. The cyclic group can contain a substantial amount of the alkyl phosphate salt of the N-alkyl of a heterocyclic nitrogen compound diaminoalkane is preferred, approximately in one amount be e.g. B. a piperidyl group, piperazyl 15 ratio of 60 to 90 percent by weight of the diamine salt group. zes and 10 to 40 percent by weight of the monoamine salt

In general, neutral salts are made from the zes, only solvents. When applying Alkyl phosphate and the alkyl monoamine or from a solvent is expediently a reason Alkyl phosphate and the N-alkyl diaminoalkane. solution that combines the active ingredients in one preferred. By applying a concentration of about 10% to saturation, the neutral salts are de-stoichiometric Amounts of the alkyl phosphate and holds; the saturation concentration is usually of the amine, d. H. equivalent amounts of acid - over about 50 percent by weight of active ingredients and amino groups. The individual parts.

The amounts used therefore depend on the additive mixture or the two salts, if

Whether an orthophosphate or a pyrophosphate, these are added separately, give the engine monoalkylphosphate or a dialkylphosphate and fuel is processed even with the addition of a very small amount of a monoamine or diamine. In the significantly improved anti-icing and pure additive, basic salts, formed by retention properties, can also be used. Usually, a concentrator application is a deficiency of acid groups tration in the motor fuel in the range of 0.001 ° / ₀ in a ratio to the amine groups, or acidic salts, 30 to 0.05 weight percent, preferably about 0.002 ° / ₀ formed by application of an excess of up to 0.01 percent by weight, based on the active constituent acid groups in relation to the amine groups, advantages applied.

lie. The numerous possible salt mixtures are preferably used in a suitable one

do not hold themselves in one and the same fuel, not emergency solvents and in this form in the maneuverable the same, but all result in substantial 35 motor fuel mixed in and evenly improved in comparison to the results that are distributed. It is clear that the additive according to the invention, when each of the components is used alone, can be used together with other additives to be added to the fuel for other purposes. The salts can be used in a simple manner. These include, for example, mixing the alkyl phosphate with the alkyl mono antioxidant, metal deactivators. If geamine and / or the N-alkyldiaminoalkane in the desired, these other additives can be mixed in the required proportions for ambient additive according to the invention, at such a temperature, preferably with vigorous stirring, that the mixture can be produced as a uniform multi-purpose product . The phosphate salt of the alkyl mono- can be put on the market. Further pre-amine and the phosphate salt of the N-alkyldiamino- 45 parts of the additive according to the invention consist in the fact that alkanes can be prepared separately or together. Corrosion of the motor vehicle, the latter by inhibiting the alkyl part or parts that come into contact with the fuel, phosphates with both the alkyl monoamine and the cleaning or keeping the N-alkyldiaminoalkane clean to a certain extent over the Carburetor volume ratios converts, so that immediately a 50 comes into effect, which results in a cleaner inlet mixture of the salts. lines and to reduce deposits on Salt formation can result at room temperature or the inlet valves.

slightly elevated temperature, generally not above The invention is described in connection with the

about 93 ° C. Examples of excessively high temperatures further illustrate should be avoided to avoid a breakdown of 55 ...

Water with the formation of acidic phosphoramides, for example

vaten or other undesirable reaction products- The additive mixture of this example comprised 75

to exclude. In some cases it is advantageous weight percent mixed acidic mono- and di-isooctyl, to form a more flowable mixture of entorthophosphate salts of N-tallow-1,3-diaminopropane neither before or during the mixing, a solution of 60 and 25 percent by weight mixed acidic mono- and add solvents and / or the or the gebil- Ditridecylorthophosphatsalze von 2-Äthylhexyldeten To mix salts with a solvent, amine. These salts are each prepared separately to get a more fluid end product. It is done by intimately mixing the phosphates and amines Numerous solvents, usually organic, can be used in proportions to form the neutral Compounds and in particular hydrocarbon salts and subsequent mixing of the salts with Stock distillates can be used. Xylene is preferred as the solvent to form a final aromatic hydrocarbons, such as benzene, toluene, which combine the active ingredients in a solution Xylene, ethylbenzene, cumene or mixtures thereof, concentration of 50 percent by weight.

In order to carefully follow the anti-icing and cleaning properties of the additives, these were investigated both properties separately. To this end, a number of experiments were carried out at which the anti-icing properties of gasoline were determined, and another series of tests was made aimed at determining the cleaning properties.

The anti-icing tests were carried out in a standard machine operating at a compression ratio of 5.5: 1 and a speed of 900 rpm. The standard carburetor was replaced by an insulated throttle section made of glass, so that the formation of ice can be seen visually could be observed. The entire carburetor was placed in a plexiglass chamber so that the external surfaces of the carburetor were at the same temperature as the air inlet. A “The dry ice container, which was always kept half full, was attached to the carburetor maintain a constant fuel temperature; and a loss of light ends of the fuel to prevent. A buffer chamber with a volume roughly equal to the cylinder displacement was made placed between the carburetor and the engine, the line vacuum was through a valve in front of the Regulated buffer chamber. Saturated air was obtained by passing the air through an ice tower and then over a container with a water sump was passed. The temperature of the water in the swamp could be be regulated so that saturated air resulted with the temperature of the water. The air got up about 76 mm water acid compressed to ensure an automatic flow through the tower. the Temperature of the saturated air was changed in steps of 1.4 ° C to the temperature of the maximum To determine the state of icing; the latter was determined on the basis of the lowest time for one Line vacuum pressure increase from 234 to

with> 280 mm of mercury. It was established beforehand that a line vacuum of 280 mm Hg corresponded to the condition in which the machine stopped. The tests were then carried out at a temperature of 2.8 ° C below the maximum icing temperature

IS carried out.

The values given in the table below show the results obtained when using a Commercial normal gasoline with a boiling range from 36 to 194 ° C, a specific weight

ao (15.6 ° C / 15.6 ° C) of 0.7345 and a vapor pressure of 0.73 atmospheres. In this series of studies, control samples of the gasoline samples of gasoline containing each of the salts separated and samples of the gasoline, which the mixture prepared in the foregoing manner from 75% of the diaminoalkane-phosphate salt and 25 ° / ₀ of the ethylhexylamine phosphate salt contained checked. The results shown in the table below are the mean values of three test runs for each of the studies.

Table I.

Additive

Time to stop, seconds
Concentration, parts per million
25 I 50 I 75 I 100

150

50% solution of mixed acidic mono- and diisooctyl phosphate salts of N-tallow-1,3-diaminopropane

50% solution of mixed acidic mono- and ditridecyl phosphate salts of 2-ethylhexylamine ...

50% solution of a mixture of 75 weight percent mixed acidic mono- and diisooctyl phosphate salts of N-tallow-1,3-diaminopropane and 25 weight percent mixed acidic mono- and ditridecyl phosphate salts of 2-ethylhexylamine ... 5.6
4.9

5.6

9.8

12.8

62.4

12.8

28.9

78.7

31.5

39.9

116.7

27.0

46.0

38.5

61.6

152.1

142.9

From the values in the table above it can be seen that the mixture of the two phosphate salts increases the time to stand considerably increased, uiid admittedly well beyond the value derived from the results of the use of each these salts were to be expected separately. As the different Phosphate salts of amines show a certain chemical relationship, it was not foreseeable that that the mixture has any difference whatsoever compared to the separate application the salts could show alkine. In fact, however, at all concentrations given in the table a very surprising improvement achieved In and of itself it was to be expected that the results would be obtained upon application of the mixture approximately equal to the mean of the results when the additives are used separately would be. In the case of the studies with a concentration of 25 parts per million, for example a time equal to the mean of 9.8 and 12.8, d. H. so about 11.3 seconds to be expected instead led the mixture at a time of 62.4 seconds. Correspondingly, at a concentration of 100 parts

len per million a time of 37 seconds (mean of 27 and 46), but instead a time of 152.1 seconds was actually observed.

A separate blank test without any additive present was carried out for each test series. the small differences in time for the basic gasoline are within the normal accuracy limit of this test method.

Example 2

The cleaning or cleanliness properties of the additives were measured in a six-cylinder machine Chevrolet 235 determined in which the normal carburetor throttle body made of iron through a section

009583/303

transparent plexiglass tube was replaced; deposits are formed on this, so that these are determined visually or can be photographed. The carburetor air was supplied from the room through an air purifier and along with heated crankcase blow-by gas and a small amount of exhaust gas introduced into the air stream. The machine was run on a speed cycle of for 5 hours two minutes at 500 rpm and one minute at 1500 rpm, both with no load. The throttle body was checked visually and the results are very dirty, dirty, moderate in rating and clearly indicated. The marking "very dirty" means that the throttle body is on the Inside was very heavily coated. The "dirty" rating indicates that there is a strong build-up of coating. The classification "moderate" means that there was a clear, but less pronounced, coating formation. the The "clean" rating indicates that there are very few deposits as a coating on the throttle body was.

The tests of this example were carried out using a gasoline which had a boiling range of 51 to 218 ° C, a specific gravity of 0.761 and a vapor pressure of 0.35 atmospheres. The table below shows the results of tests carried out in the manner described above, in which samples of gasoline without additive, samples of gasoline containing the phosphate salt of monoamine, samples of gasoline containing the phosphate salt of diaminoalkane, and samples of gasoline, which contained the mixture of phosphate salts described in Example 1 were used. When using the additives they were used in all cases at a concentration of 50 parts per million of 50 ° / ₀ solution. In the case of the mixture, the total active ingredient concentration was 25 parts by weight per million.

Table II

VisueUe Additive Examination of the Throttle body No very dirty Mixed acidic mono- and diiso- octyl phosphate salts of N-TaIg- 1,3-diaminopropane moderate Mixed acidic mono- and di- decyl phosphate salts of 2-ethyl hexylamine dirty Mixture of 75 percent by weight mixed acidic mono- and Diisooctyl phosphate salts of N-tallow-1,3-diaminopropane and 25 weight percent mixed acidic mono- and ditridecyl phosphate salts of 2-ethylhexyl amine! .... - clean

It can be seen that the mixture of phosphate salts resulted in a substantial reduction in deposit formation. It was unforeseeable and is very surprising that additives work alone Use ratings of "moderate" and "dirty" when used in combination in the the same total concentration lead to a rating of "clean".

Example 3

.5 The mixture of this example consisted of 75 weight percent the mixed acidic mono- and ditridecyl phosphate salts of N-tallow-1,3-diaminopropane and 25 weight percent mono- and ditridecyl mixed acidic phosphate salts of n-heptyl / 3-amine.

ία The monoamine has the carbon atoms in a straight chain and the amino nitrogen is bound to the ß- or, second carbon atom. These salts were separately prepared in essentially the same manner as described in Example 1 and then dissolved in xylene to form a 50% solution of active ingredients.

When examined in a further sample of the gasoline and in the same manner as that described in Example 2, the mixture of 75 percent by weight of the mixed acidic mono- and ditridecyl phosphate salts of N-tallow-1,3-diaminopropane and 25 percent by weight of the mixed acid mono- and Ditridecylphosphatsalze of ß-Heptylamins, in a concentration of 50 parts per million in the 50 ° / ₀ solution, to clean the carburetor throttle bodies. In contrast, when using the gasoline samples without additives, very dirty throttle bodies were obtained, when using the samples which only contained the phosphate salt of the diaminoalkane, moderate results and when using the samples which only contained the phosphate salt of the amine, only slightly better results achieved. When using the mixture of the phosphate salts of the various amines, a synergistic effect is again observed.

Example 4

. The additive mixture of this example consisted of 25 percent by weight of the mixed acidic mono- and ditridecyl phosphate salts of N-tallow-1,3-diaminopropane and 75% by weight of the mixed acids Mono- and ditridecyl phosphate salts of n-heptyl-β-amine.

When examined in another sample of the gasoline in the same way as in Example 2 in the carburetor throttle body was rated at a concentration of 25 parts per million "clean". The synergistic effect of the mixture provided according to the invention is again evident here.

Eg game 5

The salt of this example consisted of a mixture of 60 percent by weight of the salt of diamyl acid phosphate and N-01eyl-1,3-diaminopropane and 40 percent by weight of the salt of diamyl acid phosphate and oleylamine. The salt was prepared by adding 2 equivalents of the diamyl acid phosphate with each one equivalent of N-oleyl-1,3-diaminopropane and oleylamine were intimately mixed at room temperature. In the mixing of toluene was used as solvent in an amount to form a final solution containing 40 ° / ₀ active ingredients.

The additive mixture solution prepared in the above manner was incorporated into commercial gasoline at a concentration of 60 parts per million. This led to significant improvements

with regard to preventing the engine from stalling and keeping the carburetor throttle body clean.

Claims (9)

Patent claims: 1. Anti-icing additive for motor fuels based on a mixture of nitrogenous compounds, characterized in that it consists of a synergistic mixture of 5 up to 95 percent by weight of an alkyl phosphate salt of an N-alkyldiaminoalkane (A) and 95 to 5 percent by weight an alkyl phosphate salt of an alkyl monoamine (B). 2. anti-icing additive according to claim 1, characterized in that the alkyl phosphate salts mixed mono- and dialkyl phosphate salts of the N-alkyldiaminoalkane and of the alkyl monoamine of the N-alkyldiaminoalkane and / or of the alkyl monoamine. 3. Anti-icing additive according to claim 1 or 2, characterized in that the alkyl groups of the alkyl phosphate components of the salts have 3 to 20 and in particular 4 to 15 carbon atoms. 4. anti-icing additive according to any one of claims 1 to 3, characterized in that the Component (A) in the mixture is an alkyl phosphate salt of an N-alkyl-1,3-diaminopropane. 5. anti-icing additive according to claim 4, characterized in that component (A) mixed mono- and dialkyl phosphate salts, in particular mixed mono- and dioctyl phosphate salts or mixed mono- and ditridecyl phosphate salts, of N-tallow-1,3-diaminopropane. 6. anti-icing additive according to any one of claims 1 to 5, characterized in that the Component (B) in a mixture of an alkyl phosphate salt, in particular mixed mono- and dialkyl phosphate salts, is a /? - alkylamine. 7. anti-icing additive according to claim 6, characterized in that the component (B) are mixed mono- and ditridecyl phosphate salts of 2-ethylhexylamine. 8. anti-icing additive according to any one of claims 1 to 7, characterized in that the Mixture of 60 to 90 percent by weight of the phosphate salt of the N-alkyldiaminoalkane and 40 bis 10 percent by weight of the phosphate salt of the alkyl monoamine. 9. anti-icing additive according to any one of claims 1 to 8, characterized in that the Mixture of the alkyl phosphate salts from acidic phosphate salts, in particular orthophosphate salts and / or pyrophosphate salts.