DE2436193B2 - FUEL SOLUBLE MULTIPURPOSE ADDITIVE FOR ENGINE GASOLINE - Google Patents

Description

d a d u r c h e k e η η ζ e i c h η e t that the amine- multipurpose additive for fuels such as motor gasoline.

sab a salt of a C - to C -monoamine and described, which is made from petrolless neutral S., 1-

d £ Syolifin ^ in ⁵ ^ ΑΓμ.οπ- zen aliphatic monoamines, «™, gt ^ gejpn-

miU.1 of the molar weight in the range of 600- maren, ^ n, ^^^ Alk ^ rn the Orthop ^ .-

2. MehiVweckzusatz according to claim 1, characterized in olefin, namely a solution in hydrocarbons that the neutral salt consists of the amine borrowed polybutene. Due to the overall effect of the salt of an ester mixture, 40 to 40 of the amine salts in combination with polybutene are SfMSp ^^ AhoShoAu ^ onoC ,, - * 5 deposits on the suction valves are reduced to C ₁₃ -oxo-alkyl esters and 60 to 40 molar pro- denes , and there is also a cleaning of carburetors contaminated with orthophosphoric acid di-C ₈ - to C ₁₃ -OxO-

3 Multi-purpose additive according to claim 1 or 2, very effective at working temperatures around 200 "C, each

characterized in that the amine salt is a 30 but the cleaning effect is be. Working star pcra

Isobutylamine salt. doors, as is common in newer motor vehicle engines

4. Multipurpose additive according to claim 1 or 2, are present and are on average about 275- C, characterized in that the amine salt is not yet fully satisfactory. 2-ethylhexylamine salt is. The object of the invention is to provide a benzmos-

5. Multipurpose additive according to claim 1 to 4, 35 union multipurpose additive for Motorenbenz.n for Ver

to provide, especially in the case of internal combustion engines, which are operated at working temperatures around 275 ° C, is particularly effective.

The subject of the invention is the patent

characterized in that the ester mixture of orthophosphoric acid mono-oxo-tridecyl ester and di-oxo-tridecyl orthophosphorate.

6. Multipurpose additive according to claim 1 to 5, 40 claim 1 specified gasoline-soluble multipurpose characterized in that the polypropylene additive for motor gasoline.

The multi-purpose additive according to the invention can advantageously also be used as a concentrate in a solvent are hydrocarbon-based. Such Kon

has a molecular weight of about 800 to 900.

7. Use of a multi-purpose additive ge

According to claims 1-6 as an additive for motor centrates consist of 10 to 50 percent by weight

petrol. Solvent and about 50 to 90 percent by weight of the multipurpose additive according to the invention.

The multi-purpose additive of the present invention is preferably motor gasoline in amounts from 0.02 to

One of the operational difficulties with burning 50 0.10 weight percent added. It is also possible for motor vehicles to operate on the basis of which up to about 0.25 percent by weight of an obcn-formation of deposits on the tulips of the lubricating oil can also be added, vent valves. These deposits can accumulate so badly under petrol that they lead to an inadequate closure, from straight-chain or branched-chain valves and, consequently, to uneven paraffins, cycloparaffins, olefins and aromatic idle, energy loss and in serious cases see compounds or mixtures of such coals even burning the valves. There will be hydrogen. The gasoline can also generally be assumed that the two main still conventional additives, such as anti-knock agents, the causes of these deposits are the fuels and the dyes, oxidation retardants, anti-icing / lubricating oils. Engine zinc often contain agents, rust inhibitors and cleaning agents. Contain preferential amounts of relatively unstable antifouling agents and the like. High molecular weight compounds. Also the amines that come with the branched chain. primäeine certain amount of lubricating oil passes between the reindeer, C _n acid -. ₁ to C _(j -AIkylestern Orthophos the valve stem and form Vuntilführung When allow it to react phoric acid neutral salts, are C ₄ - to C ₁₀ -kung the air and the Relatively high temperatures, at which 1 to 3 aliphatic residues of the inlet valve tulips are exposed to these propellants and which are sufficiently alkaline to form a series of reactions to salts of substance constituents as well as the lubricating oil and certain additives of the lubricating oil which are neutral with the acidic phosphoric acid alkyl The amines can be primary, secondary

dare or tertiary amines, and the aliphatic radicals that are bonded to the nitrogen can ^ be cyclic or acyclic radicals. De ·· aliphatic The remainder can be saturated or unsaturated, provided that that is bonded to the nitrogen atom Carbon atom is a saturated carbon atom. Generally the amines are unsubstituted hydrocarbon amines.

Examples of suitable primary amines are n-Bu-

Use mixtures as well as the monoesters or diesters on their own.

To produce the branched primary Acid phosphuric acid alkyls are used as the alcohol, a branched-chain primary alcohol having 8 to 16, preferably 8 to 13 carbon atoms or a mixture of several such alcohols. The preferred branched chain primary alcohols are those obtained by the well-known oxo synthesis

tylamine, isobutylamine, isoamylamine, n-hexylamine, ίο alcohols, and therefore the alkyl groups of be-cyclohexylamine, octylamine, 2-ethylhexylamine, 1,1, preferred acidic alkyl phosphoric acid branched-3,3-tetramthylbutylamine and technical tert-no- chain primary alkyl groups derived from oxo alcohols nylamine, which are mainly derived from C ₉ amine and ge.

ring amounts of C ₈ and C ₁₀ amine. Examples Normally 1 mole of amine per mole of ortho-

for secondary amines are di-n-bulylamine, di-sec. 15 phosphoric acid monoalkyl ester and per mole orthophosbutylamine, Diisobutylamine and diamylamine. Examples of dialkyl phorate used. The so obtained for suitable tertiary amines are Ν, Ν-dimethylcyclo salts are essentially neutral, i.e. they have hexylamine and Ν, Ν-diethylcyclohexylamine. a pH value of 6 to 7 in the water.

Preferably the amine is primary alkyl. The preferred class of amine salts are im

monoamine with 4 to 8 carbon atoms, in particular 20 essentially neutral salts, in which the acidic ones with 8 carbon atoms. When the amine is a
is secondary or tertiary amine, it preferably contains at least 8 carbon atoms. Particularly
preferred amines are 2-ethylhexylamine and isobutylamine.

An "aliphatic monoamine" is to be understood as a compound which has only one amino nitrogen atom contains, to soft 1 to 3 aliphatic

The alkyl ester component is a mixture of 40 to 60 mol _{percent orthophosphoric acid mono-Cy- to C 13} -oxo-alkyl ester and 60 to 40 mol percent orthophosphoric acid _{di-Cybis C 13} -oxo-alkyl ester. The isobutylamine salt and the 2-ethylhexylamine salt of the above mixture of phosphoric acid mono-

Residues are bound, and the sufficiently alkaline oxo-tridecyl ester and orthophosphoric acid di-oxo-tri-reacted, to with the above-mentioned acid phosphorus decyl ester. The appropriate amine salts and procedures Acid alkyl esters to form neutral salts. The amines for their preparation are known in US Pat. No. 3,228,758 primary, secondary or tertiary amines, wrote.

and the aliphatic radicals attached to the nitrogen in the gasoline additives according to the invention

are bonded, alicyclic oils can be used consists essentially of acyclic polypropylene Be leftovers. The aliphatic remainder can. saturated or a homopolymer of propylene with a be unsaturated, provided that the stick molecular weight of 600 to 1200. The polypropylene atom Bonded carbon atom, a saturated oil can be produced by known polymerization processes Is carbon atom. Generally, the amines are un- produced; see e.g. B. »Linear and Stereo Substituted Hydrocarbon amines. regular Addition Polymers «by Gaylord and Die Aminsalze are produced by pri- 40 Mark, Verlag Interscience Publishers, New York, mare acidic phosphoric acid alkyl esters, in which the 1959.

primary alkyl groups 8 to 16 carbon atoms in The molecular weights referred to here

have branched-chain configuration, with alimens, are number average molecular weights, converts phatic monoamines, the 4 to 10 carbon determined by vapor pressure osmometry (ASTM-lenstoffatome included, and each of which is aliphatic 45 test standard D 2503). In the molecular weight range of

600 to 1200, the polypropylenes are liquids with a Saybolt universal viscosity at normal temperatures at 37.8 ° C from about 2500 to 70,000 seconds, and they are highly soluble in hydrocarbons. The Saybolt universal viscosity is determined according to ASTM test standard D 445-446. That preferred polypropylene has a molecular weight in the range of 800 to 900.

Usually the ratio of polypropylene

cal radical is bonded to the amine nitrogen atom through a saturated carbon atom.

Branched-chain primary acidic phosphoric acid alkyl esters are those phosphoric acid esters which only 1 or 2 of the three acidic hydrogen atoms of orthophosphoric acid by primary branched chain Alkyl groups are replaced, d. That is, it is orthophosphoric acid monoalkyl ester and Orthophosphoric acid dialkyl ester. Such acidic phos-

Phorsäurealkylesier can 55 len to amine phosphate salt according to known methods in such a way that 1 to 50 parts,

by reacting an alcohol with phosphorus, preferably 2 to 30 parts, in particular about 4 to

Pentoxide (P ₂ O ₅ ) can be produced. Usually 15 parts of polypropylene are added for every part by weight of amine

the 2 to 4 moles of alcohol per mole of P.O. implemented. Pre-phosphate salt is not required. The two components

preferably one uses about 3 moles of alcohol per mole can be added to the gasoline separately, together or as

60

P ₂ O ₅ . If 3 NToI of alcohol per mole of P ₂ C). are used, the reaction mixture is theoretically an equimolecular mixture of the orthophosphoric acid monoalkyl ester and the orthophosphoic acid dialkyl ester; however, the ratio of the two hsters to one another can be in the range from 40 to 60 mol percent monoester to 60 to 40 mol percent dialkyl ester. These mixtures of mono- and dialkyl esters are preferred; but you can also do others

in

added to a suitable carrier

Concentrate,
will.

The concentrate contains 10 to 50 percent by weight solvent, preferably 15 to 30 percent by weight Solvent. Suitable carrier solvents are hydrocarbons such as hexane, isooctane, Luminous oil, gasoline, toluene and xylene. Technical mixtures of xylene are preferred as solvents. Representative concentrates contain 1 to 45

weight percent amine phosphate, 25 to 88 weight percent Polypropylene and 10 to 50 weight percent hydrocarbon solvent. Preferably the concentrates contain about 2 to 28 percent by weight amine phosphate, 47 to 82 percent by weight Polypropylene and 15 to 30 percent by weight Solvent; in particular, they contain 3 to 17 percent by weight amine salt, 56 to 80 percent by weight Polypropylene and 15 to 30 weight percent solvent.

The particularly preferred additive concentrate according to the invention contains 3 to 17 percent by weight of 2-ethylhexylamine salt of a mixture of orthophosphoric acid mono-oxo-tridecyl ester and orthophosphoric acid di-oxo-tridecyl ester, 56 to 80 percent by weight of polypropylene with a molecular weight of about 850 and 15 to 30 percent by weight of solvent that is in the consists essentially of mixed xylenes. If this concentrate is added to gasoline in amounts of 140 to 710 g / m ³ , which corresponds to 0.02 to 0.10 percent by weight, the mixture contains 0.0008 to 0.017% amine salt and 0.011 to 0.08% polypropylene. The preferred dose of 215 to 355 g / m ³ corresponds to 0.0012 to 0.0085% amine salt and 0.017 to 0.04% polypropylene.

In view of the planned mode of operation of the motor vehicle engines of new design, in which higher intake air temperatures, lean fuel-to-air ratios and retardation of the Ignition timing adjustment occur and where auxiliary devices are available to make discharging undesirable To prevent constituents with the exhaust gases, the intake valves, especially the tulips, need the intake valves, operate at significantly higher temperatures than the older vehicle engines; this temperature difference is on average 72 to 78 ° C. It can be assumed that this is higher Intake valve temperatures previously known to combat the deposits on the intake valves Makes additives in the "hotter" engines ineffective. It's surprising the combination of amine phosphate salt and polypropylene according to the invention are extremely effective in eliminating the accumulation suppressed by deposits on the intake valves of "hotter" engines.

It is generally believed that the deposits on the intake valves are formed by pyrolysis and oxidation of fuel components, fuel additives, lubricating oils and lubricating oil additives. On the basis of this assumption one should have expected that polypropylene, the polymer chain of which consists of - CH ₂ (CH ₃ ) CH units, would have to be quite amenable to oxidation with the formation of deposits, because it contains easily oxidizable carbon atoms with a reactive tertiary hydrogen atom. Surprisingly, the additives according to the invention do not contribute to the formation of deposits, but rather they even help to prevent the formation of deposits.

It has been found, surprisingly, that by combining a polypropylene with an aminophosphate salt according to the invention, the cleaning effect in the carburetor considerably that is increased beyond that which can be derived from the behavior of the aminophosphate alone or of the polypropylene should be expected on its own.

As already mentioned, other fuel additives can also be used together with the fuel additives according to the invention.

known fuel additives for gasoline are used will. One such additive is a non-volatile mineral lubricating oil, e.g. B. solvent extracted Bright stock with a Saybolt universal viscosity at 37.8 ° C from 500 to 1500 seconds. These oils. which are often referred to as top lubricating oils, are used in amounts of 0.04 to 0.25 percent by weight, preferably about 0.16 percent by weight, based on the fuel mixture, added.

In the following examples the gasoline additive according to the invention is prepared according to the following procedure manufactured:

production method

142 g (1 mol) of P., O ₅ are gradually added with stirring to 600 g (3 mol) of oxo-tridecyl alcohol. When the P ₂ O _{5 is added} , the temperature is allowed to rise to 65 ° C. and is then kept at the same level by external cooling. After the P ₂ O _{5 has been added} , the reaction mixture is stirred at 65 ° C. for 12 hours, whereupon According to the potentiometric titration, it consists essentially of an equimolecular mixture of orthophosphoric acid mono-oxotridecyl ester and monophosphoric acid di-oxotridecyl ester.

258 g (2 mol) of 2-ethylhexylamine are added dropwise to the reaction mixture, the temperature being increased keeps below 65 ° C. This is how the mixed salt is made from 2-ethylhexylammonium mono- and di-oxo-tridecyl phosphate as a viscous amber-colored oil. The mixed phosphates are then mixed with polypropylene mixed; the amounts and molecular weight of the polypropylene are given in the following tables.

example 1

This example illustrates the ability of the add-on combination according to the invention to clean dirty engines clean, which is demonstrated by the carburetor cleaning test described below.

This trial uses six-cylinder Chevrolet engines with a displacement of 3.77 l used those with Carter carburetors No. 3511-S and Ice towers are equipped with heaters. A motor is used to get enough in the shortest amount of time Generate throttle body deposits for the cleaning period of the experiment. As the deposit accumulation period of the experiment is carried out over the course of about 10 hours and the cleaning period If about 50 hours are needed, the experiments can be carried out in the shortest possible time, by having one motor for the buildup of debris and multiple motors for the cleaning period of the experiment. In the engine in which the deposits accumulate, the ring clearance of the top piston ring is reduced 3.175 to 3.5 mm enlarged, and the ring is used in place of the second compression ring, see above that the upper ring groove remains empty and the amount of gases blown past is thereby increased. The total amount of gases blown past is transferred from the container hood to the air cleaner of the carburetor directed. The air cleaning element is removed. The exhaust line is modified so that that it feeds the exhaust gases from the monor to the air cleaner of the carburetor.

The engine is operated under the following conditions: The manifold vacuum pre-ignition is

turned off so that a spark pre-ignition of 4 ^{C is maintained} before top dead center; the motor speed is 700 ± 10 rpm, the water outlet temperature is 79.4 ± 1.4 ° C; the air-fuel mixture is generated at maximum vacuum; the gasifier air is cooled by being passed through an ice tower and then reheated to 32 to 35 ° C .; the exhaust gases from the engine are supplied to the air inlet of the carburetor as described below.

The fuel used is »MS-08«, a technical standard fuel for the »Sequence MS« oil test, used. The engine is connected to the engine inlet in with the exhaust gas supply valve closed Gear set. The speed is regulated to 700 rpm with maximum vacuum. The exhaust gas supply valve is opened and the engine speed is kept at 700 rpm. The setting of the exhaust gas supply valve is critical. The setting is such that the maximum amount is supplied to exhaust gases that the engine can tolerate without stalling if it runs smoothly. Of the The engine is kept running either for 10 hours or until it does not work under these conditions more runs. The carburetor is removed and rated on a visual rating scale. A Value of 100 means pure. If a purity value greater than 30 is obtained, there is another accumulation of debris required.

For the cleaning period of the experiment, the "dirty" carburetor is placed in another engine, and it is worked under the operating conditions described above with the difference, that normal piston rings are used and the gases blown by and the exhaust gases not are supplied to the air inlet. Before the experiment, new spark plugs are inserted, the crankcase Loaded with low-detergent SAE 30 oil and the air cleaner housing and exhaust system are cleaned.

The cleaning process is carried out over the course of 50 hours in sections of 10 hours each. and the results are evaluated at appropriate time intervals by the amount and determine the speed of cleaning. The percentage cleaning is according to the following Equation determines:

Table I.
Carburetor cleaning

Test polypropylene, amine phosphate, molecular weight 850,

No. Weight percent by weight

cleaning

1 0 0 16 IO 2 0 0.003 21 3 0 0.006 21 4th 0.038 0 21 5 0.038 0.003 27 0.038 0.006 32 7th 0.06 0.003 29

Example 2

ao This example shows the surprising effectiveness of the additive according to the invention in combating the build-up of deposits the inlet valve.

Valve deposit test

The first attempt is a Seehs-cylinder Chevrolet engine, 1968, displacement 4.1 1, which is provided with a "Po \ ver-Glide" gearbox and an inertia flywheel. The engine is on a test stand with a dynamometer to absorb the output power. The heads are completely repaired, the deposits are removed from the top of the pistons and the Carburettor overhauled. One of the inlet valves has a thermocouple wire attached to the tulip to record the temperature. The engine comes with a new PCV valve, new spark plugs, tips and a new fuel filter. The oil filter is changed and it becomes 10W-30-Ö1 filled. The fuel »MS-08« described above is used as fuel. The fuel contains Tetraethyl lead (0.77 g / l) as well as 0.5 theoretical units of ethylene dibromide and 1.0 theoretical unit Ethylene dichloride.

The test is carried out by running the engine for 100 one hour periods. Every Period consists of the following conditions:

Cleaning, ° / o

R ₀ -R _n
100 - R _n

- 100.

In the above equation, R _{D is} the carburetor value after the deposits have accumulated and R _{0 is} the carburetor value after cleaning.

Those with the fuel base (»MS-08«) alone, with the fuel base each containing a single additive and results obtained with the fuel base containing the combination of additives are summarized in Table I. The 2-ethylhexylamine salt of a mixture is used as the amine phosphate from orthophosphoric acid mono-oxo-tridecyl ester and orthophosphoric acid di-oxo-tridecyl ester used. The results show that the additional combination according to the invention removes the dirty carburetors in effectively removes deposits. The cleaning effect of the combination is stronger than that which one after the action of the individual components, namely the polypropylene and the Aminnhosnhatsalzes. should expect.

⁵⁰ time span engine Dyname- throttle speed tneter- age speed age min RPM RPM

Obis 5

5 to 8

8 to 12

12 to 15

15 to 18

18 to 21

21 to 26

26 to 29

29 to 34

34 to 60

600

600

600

600

600

1300 ± 50

1700 + 50

2050 + 75

1300 + 50

28OO ± 75

Idle WOT *;

idle

Idle WOT *

idle

Idle WOT *

idle

Idle WOT *

idle

Idle WOT *

idle

*) 5 see idle, 5 see full throttle.

The inlet and outlet temperatures of the engine coolant, The temperature and pressure of the engine oil as well as the temperature of the transmission oil and the speed engine and dynamometer are recorded, oil and spark plugs are checked Replaced 50 hours.

After 100 cycles, the previously weighed inlet valves are removed by scraping all debris except the tulip debris cleaned and reweighed. The during of the experiment determined by the thermocouple valve bulb temperature is in the range of approx 154 to 254 ° C with an average of 200 ° C. The Products can be found in Table II.

Table II

Polymer, weight amine phosphate valve molecular weight percent salt deposition

Weight (mean)
percent g

None - 0 1 , 38 Polypropylene 0.031 0.003 0 , 30 (850)

In the second attempt, which is designed so that the inlet valves operate at higher temperatures than at the first attempt, work according to the following procedure and the following conditions:

Buick Inlet Valve Deposit Test (IVD)

In this experiment, Buick-Electra engines (1971) with a displacement of 7.13 1 of low Compression ratio (8.5: 1) used those with four cylinder carburetors and automatic transmissions are equipped. There are normal air conditioning systems in these motor vehicles. before The tests are carried out using completely reconditioned heads with weighed inlet valves. One of the inlet valves is connected to the tulip with a thermocouple wire to measure the temperature recorded. The deposits are removed from the piston crown, and the suction pipe is cleaned with solvent. There will be new spark plugs, tips, a new PCV valve, air filters and oil filter inserted. The carburetor settings and regulations are based on the information provided by the Hei stellers carried out.

The measurement of the kilometers driven is done with a programmed chassis dynamometer, etc. (PCD) carried out according to the following scheme:

Driving style Time in the conditions Driving style lake kgh 1 60 idle 2 20th Acceleration to 112 3 30th Alternating acceleration slowing down and slowing down between 96 and 112 in Intervals of 5 see 4th 25th Slow down to 64 5 15th Acceleration to 112 6th 100 Repetition of the driving style 3, 4, 5 and 3 " 7th 25th Slow down to idle 8th - Repeating the above Schemas for a period from 110 h

At the end of the experiment, the deposits on the inlet valves are weighed and measured in grams "j

Valve expressed. The deposits on the inlet valve tulips are also assessed, including the standardized positive CRC rating scale is used, in which a pure valve has a value of 10. away bearings on the valve stem are also evaluated, with a pure stem receiving a value of 10 The purity of the valve stem is assessed by comparison with a standardized photograph " see scale.

The valve bell temperature is measured with the thermocouple during the test about 249 to 210 ° C with an average value vcr 275 ° C. The test results when using the "MS-08" fuel described above and "de according to the manufacturing process described above

The additives produced are summarized in Table III.

Table III Attempt no. 5 6th 7th 0.003 4th Polypropylene (850) Polymer (molecular weight), none 0.25 0.038 weight percent 0.003 0.004 89 Amine phosphate, 0 9.0 Weight percent + 1.9 IVD test 0.85 1.20 9.8 Grams per valve 2.32 63 48 + 4.7 (Average) - 7.6 7.1 Reduction,%> 7.1 + 0.5 0 Tulip value - 9.5 8.9 Difference in value 5.1 + 4.4 + 3.8 Shaft value - Difference in value

As the results show, it follows from the weights of the deposits and the values for The tulip and valve stem are excellent for suppressing the formation of deposits. The fuel mix, the polypropylene and the 2-ethylhexylamine salt of mixed orthophosphoric acid mono- and -di-oxo-tridecyl esters, in experiment no. 7 0.08 percent by weight top lubricating oil added to achieve excellent deposit suppression on the inlet valve. That Top lubricating oil is a solvent-extracted brighlstock with a specific gravity of 0.8789 and a Saybolt universal viscosity at 37.8 ° C of 763 seconds and at 99 ° C of 78 seconds.

To prove the superiority of the gasoline additives according to the invention at medium engine temperatures

Temperatures of 275 ° C, comparison tests were carried out exactly according to the method of Example 2. at These tests were the deposits on the inlet valve tulip (tulip value) and on the valve stem (Shaft value) determined. The experiments carried out according to the invention are experiment no. 5 to 7 of Table 111. The comparative experiments were carried out under identical conditions with the same Amount of polyisobutylene in place of the polypropylene

ίο carried out. For the sake of completeness, the The table below gives an overview of all experiments (those according to the invention and the Comparative experiments), with the experiment carried out without the addition of petrol (experiment no. 4 from table III) is added.

Table IV

attempt Polyolefin (molecular weight) Amine IVD test Diminish Tulip value Shaft value 0.038 weight percent phosphate Gram tion Weight per valve Vq difference difference No. percent (Average)

4th none none 2.32 - 7.1 - 5.1 - 5 Polypropylene (850) 0.003 0.85 63 7.6 + 0.5 9.5 + 4.4 6th Polypropylene (850) 0.004 1.20 48 7.1 0 8.9 + 3.8 7th Polypropylene (850) 0.003 0.25 89 9.0 + 1.9 9.8 + 4.7 Comparative attempt No. 1 Polyisobutylene (2500) 0.003 1.28 45 6.8 -0.3 - - 2 Polyisobutylene (2500) 0.004 1.52 35 6.5 -0.6 - - 3 Polyisobutylene *) (2500) 0.003 1.62 30th 7.0 -0.1 9.1 4-4.0 4th Polyisobutylene (800) 0.003 1.50 35 6.3 -0.8 8.0 + 2.9

*) This fuel also contains 0.08 percent by weight of top lubricating oil. The above lubricating oil is a bright stock lösungsmittclextrahicrtcr with a specific gravity of 0.8789 and a Saybolt Universal Viskositäl at 37.8 ° C of 37 seconds and at 99 ⁰ C of 7S seconds.

The comparisons show the technical progress in terms of the amount of deposits on the Valve cups and valve stems.

It is also important that the fuel used in Experiment No. 7, in addition to the one according to the invention Additive also still contains a top lubricating oil, the formation of deposits in the intake valves extremely suppressed, while the addition of the same top lubricating oil in the comparative experiment No. 3, in which the gasoline additive contains polyisobutylene instead of polypropylene, no additional advantageous Has an effect.

When compared with the control fuel, which does not contain any additive (test no. 4), the additive mixture according to the invention shows an average decrease in valve deposits of 67 ⁿ / o (average of 63, 48 and 89%), whereas the additive containing the polyisobutylene only results in a mean decrease in valve deposits of 36% (mean of 45, 35, 30 and 35%).

The tulip value improves on average when using the additive according to the invention 0.8 units (mean of 0.5, 0 and 1.9), whereas with the polyisobutylene containing The addition even results in a deterioration (mean of -0.3, -0.6, -0.1 and -0.8 = -0.4).

The shaft value is increased by an average of 4.3 units by the addition of gasoline according to the invention, by the However, polyisobutylene-containing additive was only improved by 3.5 units.

Claims (1)

'L patent claims: 1. Gasoline-soluble multipurpose additive for motor gasoline, consisting of (A) a gasoline-soluble neutral salt of an aliphatic monoamine having at least 4 carbon atoms, in which each radical bonded to the amino nitrogen atom is bonded via a saturated carbon atom, and a branched-chain primary acidic C ₈ - to C _ie -alkyl ester of orthophosphoric acid and (B) 1 to 50 parts by weight of one normally one which probably includes oxidation and thermal decomposition, and which lead to the formation of solid or semi-solid residues called deposits.
Another problem with operation is caused by the accumulation of deposits in the carburetor, particularly on the throttle valve and the surrounding wall. Such harmful deposits come from impurities in the fuel and ίο in the air, especially from vapors that escape from the crankcase and from substances that are introduced by the normally existing exhaust gas circulation system. The accumulation of debris in the carburetor leads to uneven liquid polyolefin per part by weight of the engine idling and frequent stalling. called salt, T _n (j _he DT-AS ⁹ O 40 350 is a petrol-soluble