ES2385422T3 - Composition of a diesel fuel additive and a cleaning procedure using it - Google Patents

Abstract

A diesel fuel additive composition comprising (a) poly (oxyalkylene alkyl amine) represented by Formula (1) below, (b) glycol monoalkyl ether represented by Formula (2) below, (c ) glycol dialkyl ether represented by Formula (3) below, (d) a heterocyclic compound, and (e) water; wherein the diesel fuel additive composition contains component (a) of 50 to 80% by weight, said component (b) of 5 to 20% by weight, said component (c) of 5 to 15% by weight, said component (d) of 5 to 15% by weight, and said component (e) of 1 to 5% by weight; wherein R1 represents an alkyl group with a carbon number of 8 to 25, each of A1 and A2 is an alkylene group with a carbon number of 2 to 4, if A1O and / or A2O are repeated, each of the A1 and A2 may be the same or different alkylene group, and kyl represent, respectively, a number from 1 to 30, in which R2 is an alkyl group with a carbon number from 1 to 8, A3 is an alkylene group with a carbon number of 2 or 3, if A3O is repeated, A3 may be the same or different alkylene group, and m represents a number from 1 to 4, and in which each of R3 and R4 is an alkyl group with a Carbon number from 1 to 8, A4 is an alkylene group with a carbon number of 2 or 3, if A4O is repeated, A4 can be the same or different alkylene group, and n represents a number from 1 to 4.

Description

  Composition of a diesel fuel additive and a cleaning procedure using it.  

5 Field of the art The present invention relates to a diesel fuel additive composition added to diesel fuel, and to a cleaning method using it.

Background of the technique

 Recently, from the point of view of environmental issues, the reduction of the amount of nitrogen oxides (NOx), of particulate matter (MP), etc. has become a problem. One way to solve this problem is a diesel engine equipped with a common fuel injection system.

15 rail (general intake manifold). A fuel inlet system of the general intake manifold type accumulates the pressurized fuel by means of a fuel injection pump, in a general intake manifold, which is an accumulator vessel, and blows the high pressure fuel accumulated in the general fuel manifold. intake to a cylinder through a fuel injector nozzle. The general intake manifold type fuel injection system has the problem that the fuel is exposed to high temperature and high pressure and, consequently, several additives in the fuel are denatured and, therefore, deposits are attached to the injector nozzle

25 To properly use the injector nozzle, it is necessary to remove the deposits. So far, several detergents that withdraw deposits have been reported (see Japanese Patent Publications not examined No. 2008-81626 and No. 2008-81627). Specifically, there are detergents comprising poly (butene-amine), poly (ether-amine), etc., as the main component, which are effective in the removal of carbon-based deposits. Japanese Unexamined Patent Publication No. 2008-81626 describes a detergent composition that can

35 remove water soluble deposits of sodium or potassium compounds. Japanese Unexamined Patent Publication No. 2008-81627 describes a detergent composition that can remove mixed deposits in which water soluble deposits of sodium or potassium compounds and water insoluble deposits of degraded substances or fuel additives are mixed.

Summary of the invention

 However, in addition to the water-soluble deposits and water-insoluble deposits, mentioned above, deposits derived from polymeric substances, which are derived from polymer-like substances, such

As an ethylene-vinyl acetate copolymer, diesel fuel content as a low temperature fluidity improving agent can be mixed in the above deposits. In such a case, the detergent compositions described in Japanese unexamined patent publications No. 2008-81626 or No. 2008-81627 do not have a cleaning effect on deposits derived from polymeric substances. If several solvents are used to clean the deposits derived from polymeric substances, the separation and swelling of the deposits takes place, and therefore a part of the fuel lines can become clogged with the separate and swollen deposits, resulting in this to engine draft.

55 In view of the drawbacks of these prior techniques, an object of the present invention is to provide a diesel fuel additive composition that can be dispersed stably in diesel fuel, which can simultaneously remove deposits derived from polymeric substances, Water soluble deposits and water insoluble deposits, and do not cause any adverse effects on an object to be cleaned, and a cleaning procedure that uses the diesel fuel additive composition. In accordance with a first aspect of the invention, a diesel fuel additive composition comprising

65 (a) poly (oxyalkylene alkylamine) represented by the following Formula (1),

 (b) glycol monoalkyl ether represented by the following Formula (2),

(C)

glycol dialkylene represented by the following Formula (3),

(d)

a heterocyclic compound, and

(and)

Water;

wherein the diesel fuel additive composition contains component (a) of 50 to 80% by weight, component (b) of 5 to 20% by weight, component (c) of 5 to 15% by weight, the component (d) of 5 to 15% by weight, and component (e) of 1 to 5% by weight;

10 (where R1 represents an alkyl group with a carbon number of 8 to 25, each of the A1 and A2 is an alkylene group with a carbon number of 2 to 4, if A1O and / or A2O are repeated, each of the A1 and A2 can be the same or different alkylene group, and kyl represent, respectively, a number from 1 to 30),

(where R2 is an alkyl group with a carbon number of 1 to 8, A3 is an alkylene group with a carbon number of 2 6 3, if A3O is repeated, A3 can be the same or different alkylene group, and m represents a number from 1 to 4), and

(in which each of R3 and R4 is an alkyl group with a carbon number of 1 to 8, A4 is an alkylene group with a carbon number of 2 6 3, if A4O is repeated, A4 can be the same alkylene or different group, 25 and n represents a number from 1 to 4).

The diesel fuel additive composition of the present invention is added to diesel fuel to clean deposits that adhere to the injector nozzle of a diesel engine equipped with a general intake manifold type fuel injector.

The above diesel fuel additive composition of the present invention is dispersed in diesel fuel due to the presence of the above components (a) to (e) in specific proportions, and therefore it is possible to withdraw deposits derived from polymeric substances, Water-soluble deposits and insoluble deposits at the same time, without any adverse influence on the object to be cleaned.

The stability of the above diesel fuel additive composition in diesel fuel can be ensured by the previous component (a), poly (oxyalkylene alkylamine). Thus, the above diesel fuel additive composition may be dispersed stably, when added to diesel fuel.

40 Deposits derived from polymeric substances and water insoluble deposits can be satisfactorily eliminated due to the presence of the previous component (a), poly (oxyalkylene-alkylamine), of the previous component (b), glycol monoalkylether, of the previous component (c), glycol dialkyl ether and the above component (d), a heterocyclic compound, in total in the diesel fuel additive composition.

45 Water soluble deposits can be cleaned due to the presence of the previous component (e), water.

Water tends to corrode the object to be cleaned, but it is possible to stably disperse the water and prevent corrosion of the object to be cleaned by restricting the amount of the previous component (e) to be contained and also that Contains the previous component (a).

Thus, the present invention can provide a diesel fuel additive composition that is stably dispersed in diesel fuel, can remove deposits derived from polymeric substances, water-soluble deposits and water-insoluble deposits at the same time, and not cause No adverse effect on the object to be cleaned.

In accordance with a second aspect of the invention, there has been provided a method of cleaning and removing a deposit derived from polymeric substances, a water soluble deposit and a water insoluble deposit that adheres to a nozzle of the injector nozzle. a diesel engine equipped with a general intake manifold type fuel injector, comprising adding the diesel fuel additive composition in accordance with

60 the first aspect of the invention of 0.5 to 2% by weight of diesel fuel.

The cleaning process of the present invention, as mentioned above, is carried out using the diesel fuel additive composition of the first aspect of the invention. Therefore, the above composition of diesel fuel additive is stably dispersed in diesel fuel, and deposits derived from polymeric substances, water-soluble deposits and water-insoluble deposits.

5 eliminate at the same time, without any adverse effect on the object to be cleaned.

Detailed Description

The diesel fuel additive composition according to the first aspect of the invention comprises the 10 components (a), (b), (c), (d) and (e) above as mentioned above.

In the previous Formula (1), which has the previous component (a), R1 represents an alkyl group with a carbon number of 8 to 25.

For the alkyl group with a carbon number of 8 to 25, for example, an octyl group, a nonyl group, a decyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a hexadecyl group, a group can be provided octadecyl, etc. A dodecyl group is particularly preferable for the previous R1.

In the previous Formula (1), each of the A1 and A2 represents an alkylene group with a carbon number of 2 to

20 4.

As the alkylene group with a carbon number of 2 to 4, for example, an ethylene group, a propylene group, a butylene group, etc. can be provided.

As mentioned above, if A1O and / or A2O are repeated, that is, when k and / or 1 are from 2 to 30, A1 and / or A2 may be the same or different alkylene group.

For the above A1 and A2, an ethylene group is preferred.

30 If the above A1 and A2 are a methylene group, hydrophilicity is high, thus leading to the possible decrease in fuel solubility. On the other hand, when the above A1 or A2 are an alkylene group with a carbon number of 5 or more, the lipophilicity is high, and thus the water may not be dispersed in a stable manner.

In the previous Formula (1), each of the k and l represents a number from 1 to 30.

35 If the previous k is 31 or more, the hydrophilicity is high, thus leading to the possible decrease in fuel solubility.

It is preferable that the value of k + 1 is 2 to 4. If the value of k + 1 is above 4, the hydrophilicity is increased and thus the solubility of the fuel can be decreased.

The above component (a) is preferably lauryldiethanolamine.

In the previous Formula (2), which represents the previous component (b), R2 is an alkyl group with a number of 45 carbons from 1 to 8.

For the alkyl group with a carbon number from 1 to 8, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group and an octyl group can be provided.

50 If the above R2 is an alkyl group with a carbon number of 9 or more, the solidifying point thereof is high and, consequently, the fluidity at low temperature is diminished.

In the previous Formula (2), A3 is an alkylene group with a carbon number of 2 6 3.

For the alkylene group with a carbon number of 2 6 3, an ethylene group, a propylene group, etc. can be provided.

As mentioned above, if A3O is repeated, that is, when m is from 2 to 4, the previous A3 can be the same or different alkylene group.

60 If the above A3 is a methylene group, hydrophilicity is high, thus leading to the possible decrease in fuel solubility. On the other hand, if the previous A3 is an alkylene group with a carbon number of 4 or more, the lipophilicity is high, and thus the water may not be dispersed in a stable manner.

65 In the previous Formula (2), m represents a number from 1 to 4.

If m is 5 or more, the hydrophilicity is high, and the solubility of the fuel is possibly reduced.

The above component (b) is preferably one or two or more selected from the group consisting of ethylene glycol monoethylene ether, diethylene glycol monomethylene, diethylene glycol monobutylether and dipropylene glycol dimethyl ether. In the previous Formula (3) having the previous component (c), each of the R3 and R4 represents an alkyl group

with a number of carbons from 1 to 8. As mentioned above, for the alkyl group with a carbon number from 1 to 8, they can

providing a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group and an octyl group. If the above R3 or R4 are an alkyl group with a carbon number of 9 or more, the solidifying point is high, and

low temperature fluidity can be reduced. In the previous Formula 6 (3), A4 is an alkylene group with a carbon number of 2 6 3. For the alkylene group with a carbon number of 2 6 3, an ethylene group, a group can be provided

propylene, etc.

As mentioned above, if A4O is repeated, that is, if n is from 2 to 4, the previous A4 can be a same alkylene group or different. If the above A4 is a methylene group, hydrophilicity is high, thus leading to the possible decrease in solubility.

of fuel On the other hand, if the previous A4 is an alkylene group with a carbon number of 4 or more, the lipophilicity is high, and thus the water can be dispersed stably. In the previous Formula (3), n represents a number from 1 to 4.

If n is 5 or more, hydrophilicity is high, thus leading to the possible decrease in fuel solubility. The above component (c) is preferably one or two or more selected from the group consisting of dimethyl ether of diethylene glycol, diethylene glycol dibutylether and dipropylene glycol dimethyl ether.

A heterocyclic compound, which is the previous component (d), is a compound that contains an atom of

nitrogen, an oxygen atom, a sulfur atom, etc., as a ring-forming atom. The above component (d) is preferably one, or two or more selected from the group consisting of N-methyl-2-pyrrolidone, 1,4-dioxane and γ-butyrolactone.

The previous component (a) is 50 to 80% by weight. If the content of the previous component (a) is less than 50% by weight, the water is not dispersed in the

fuel stably. On the other hand, if the content of the previous component (a) is more than 80% by weight, the stability of the fuel additive at low temperature takes place. More preferably, the content of the above component (a) is 60 to 70% by weight. The previous component (b) is 5 to 20% by weight. If the content of the previous component (b) is less than 5% by weight, a cleaning effect is not obtained

enough, and the water may not disperse stably. On the other hand, if the content of the previous component (b) is more than 20% by weight, the deposits derived from polymers between the deposits that adhere to objects to be cleaned become viscous, and the operability of the injector nozzle can reduce.

More preferably, the content of the above component (b) is 10 to 15% by weight. The previous component (c) is 5 to 15% by weight. If the content of the previous component (c) is less than 5% by weight, a sufficient effect of

cleaning. On the other hand, if the content of the previous component (c) is more than 15% by weight, the deposits Polymer derivatives between the deposits that adhere to the object to be cleaned become viscous, and the operability of the injector nozzle can be reduced.

More preferably, the content of the above component (c) is 5 to 10% by weight.

The previous component (d) is 5 to 15% by weight.

If the content of the previous component (d) is less than 5% by weight, a sufficient cleaning effect may not occur and the water may not be dispersed in a stable manner. On the other hand, if the content of the previous component

(d) it is more than 15% by weight, the deposits derived from polymers between the deposits that adhere to the object to be cleaned become viscous, and the operability of the injector nozzle can be reduced.

More preferably, the content of the above component (d) is 5 to 10% by weight. 10 The previous component (e) is 1 to 5% by weight.

If the content of the previous component (e) is less than 1% by weight, a cleaning effect may not occur against the components of the water soluble deposits. On the other hand, if the content of the previous component 15 (e) is more than 5% by weight, an adverse effect can be exerted on the system using the previous object to be cleaned, for example, leading to corrosion of the object that It has to be cleaned.

More preferably, the content of the above component (e) is 2 to 3% by weight.

20 It is preferable that the ratio of the content of the previous component (e) to the previous component (a) (content (e) / content (a)) is not greater than 0.1.

With this relationship of content, water, which is component (e), can be dispersed stably.

25 If the previous content (e) / content (a) is greater than 0.1, the water may not be dispersed stably, and an adverse effect can be exerted on the system using the previous object to be cleaned.

The diesel fuel additive composition of the present invention is a concentrated solution that has to be added to the diesel fuel, and can remain stable by itself.

30 It is preferable that the above diesel fuel additive composition be used to be added 0.5 to 2% by weight of diesel fuel.

With this amount of diesel fuel additive a good detergency can be obtained.

35 If the content of the previous fuel additive is less than 0.5% by weight of diesel fuel, sufficient detergency may not be obtained. On the other hand, if the content of the previous fuel additive is more than 2% by weight, the water content in the fuel increases, so that an adverse effect on the system can be exerted using the previous object to be cleaned, for example, causing corrosion of the object that has

40 to be cleaned.

More preferably, the content of the above composition of diesel fuel additive versus diesel fuel is 1% by weight.

The above fuel additive can be added to the diesel fuel by pouring it into a fuel tank of a diesel engine, or the diesel fuel mixed with the diesel fuel additive composition before it can be used.

Other components may be added to the diesel fuel additive composition of the present invention (by

For example, a cetane index improving agent, such as octyl nitrate and cyclohexyl nitrate, a cleaning agent such as poly (ether-amine) and poly (butenyl-amine), a corrosion inhibitor such as an aliphatic amine and an alkenyl succinate ester, or an antifreeze agent such as poly (ether glycol) according to various purposes while preserving the mode of operation and the effect of the above diesel fuel additive composition.

In the cleaning process according to the second aspect of the invention, cleaning, as described above, is carried out by adding the diesel fuel additive composition according to the first aspect of the invention of 0.5 at 2% by weight of diesel fuel.

60 If the content of the previous fuel additive in diesel fuel is less than 0.5% by weight, sufficient detergency may not be obtained. On the other hand, if the content of the previous fuel additive is more than 2% by weight, the water content in the fuel is increased and an adverse effect can be exerted on the system using the previous object to be cleaned, for example , leading to corrosion of the object to be cleaned.

65 The above cleaning procedure can be carried out by pouring the diesel fuel additive composition into a diesel engine fuel tank, from there adding the diesel fuel additive composition to the diesel fuel, or using the diesel fuel mixed with the Composition of diesel fuel additive in advance.

Examples

Example 1

10 This example of diesel fuel additive composition according to the present invention is explained below, but the present invention is not limited thereto.

In this example, diesel fuel additive compositions were prepared as embodiments of the present invention (Samples E1 to E6), and diesel fuel additive compositions as examples

15 comparatives (Samples C1 to C10).

The diesel fuel additive compositions (Samples E1 to E6) as embodiments of the present invention are comprised of (a) poly (oxyalkylene alkylamine) represented by Formula (1) below, (b) glycol monoalkylene represented by Formula (2) below, (c) glycol dialkyl ether represented by

Formula (3) below, (d) a heterocyclic compound, and (e) water. The compositions contain component (a) of 50 to 80% by weight, component (b) of 5 to 20% by weight, component (c) of 5 to 15% by weight, component (d) of 5 a 15% by weight, and component (e) from 1 to 5% by weight.

25 in which R1 represents an alkyl group with a carbon number of 8 to 25, each of A1 and A2 is an alkylene group with a carbon number of 2 to 4, if A1O and / or A2O are repeated, each of the A1 and A2 may be the same or different alkylene group, and kyl represent, respectively, a number from 1 to 30.

where R2 is an alkyl group with a carbon number of 1 to 8, A3 is an alkylene group with a carbon number of 2 6 3, if you repeat A3O, A3 can be the same or different alkylene group, and m represents a number from 1 to 4.

in which each of the R3 and R4 is an alkyl group with a carbon number of 1 to 8, A4 is an alkylene group with a carbon number of 2 6 3, if A4O is repeated, A4 may be the same group alkylene or different, and 40 represents a number from 1 to 4.

To manufacture the above diesel fuel additive compositions (Samples E1 to E6 and Samples C1 to C10) components (a) to (e) shown in Table 1 were prepared.

Then, the components (a) to (e) shown in Table 1 were mixed to make the diesel fuel additive compositions (Samples E1 to E6, and Samples C1 to C10) with the compositions shown in Table 2.

Table 1 50

(to)

to Poly (oxyethylene dodecylamine)

b1

Diethylene glycol monomethyl ether

b2

Diethylene Glycol Monoethylether

(b)

b3 Diethylene Glycol Monobutylether

b4

Dipropylene Glycol Monomethylene

b5

Dipropylene Glycol Monobutylether

(C)

c1 Diethylene Glycol Dibutylether

c2

Diethylene glycol dimethyl ether

(d)

d N-methyl-2-pyrrolidone

(and)

and Water

Of the diesel fuel additive compositions obtained, the low temperature flow range evaluation tests were carried out for Samples E1 to E6, and sample C9, and their low temperature flow margins were evaluated.

5 In the evaluation tests of the low temperature fluidity range, the low temperature fluidity margin was evaluated for each sample by testing whether or not the samples flowed at -5OC.

If the sample flowed at -5OC the evaluation is represented by "F", and if the sample did not flow at -5OC, the evaluation is represented by "NF". 10 The results are shown in Table 3.

Table 3

Composition of diesel fuel additive (Sample #)

Marginal evaluation of low temperature fluidity

E1

F

E2

F

E3

F

E4

F

E5

F

E6

F

C9

NF

As can be seen in Table 3, Samples E1 to E6 as embodiments of the present invention are superior in terms of low temperature fluidity range.

Sample C9 as a comparative example was not fluid at -5OC, since the content of component (a) was greater than the upper limit defined in the present invention.

Then, the diesel fuel compositions (Diesel fuel compositions 1 to 17) shown in Table 4 were prepared by mixing the respective diesel fuel additive compositions (Samples E1 to E6, and Samples C1 to C10) at 1% by weight of the Diesel.

25 The Diesel fuel composition 7 does not contain any diesel fuel additive composition, and comprises 100% diesel fuel.

Subsequently, the detergency, stability and corrosivity evaluations of the diesel fuel compositions obtained (Diesel fuel compositions 1 to 17) were carried out.

The results are shown in Table 4. 5 �Detergency�

To assess the detergency, the needle area from which the bonded deposits (a mixture of deposits derived from the polymer substance, water soluble deposits and water insoluble deposits) were removed from the

10 injector of a vehicle equipped with a fuel injection system. The needle area was then submerged in the individual diesel fuel compositions (Diesel fuel compositions 1 to 17) for 24 hours, and the extent to which the deposits were removed was visually evaluated.

(Evaluation criteria) 15

AA� Almost all deposits were withdrawn A� Most of the deposits were withdrawn x� The amount of deposits withdrawn was very small and� The deposits were viscous

20 z� Deposits were barely withdrawn

It is assumed that the evaluations represented by AA or A were good and acceptable, and the evaluations represented by x, y or z were bad and unacceptable.

25 Stability

Stability was assessed by visually observing the dispersibility of diesel fuel additive compositions if the previous diesel fuel additive compositions (Samples E1 to E6, and Samples C1 to C10) were added to diesel fuel.

30 It was assumed that the samples in which no water separation was found were good and acceptable (evaluated as �), and the samples in which water separation was found were bad and unacceptable (evaluated as u).

35 `` Corrosivity ''

To evaluate the corrosivity, filter papers were laid on 6 cm diameter Petri dishes, and 5 g of crushed cast iron shavings (FC200) were deposited on the filter papers. The above diesel fuel compositions (Diesel fuel compositions 1 to 17) and introduced into the Petri dishes, followed by

40 a 10 minute immersion of the cast iron chips in said place, and then the test solutions were removed by decantation. Subsequently, the tests were stored in a 20OC container and 60% humidity. The state of corrosion formed in the crushed cast iron chips was observed to assess the corrosivity.

It was assumed that the examples in which no corrosion was found were good and acceptable (evaluated as �), and the examples in which the corrosion formation was found were bad and unacceptable (evaluated as u).

As can be seen in Table 4, the Diesel fuel compositions 1 to 6 as embodiments of the present invention showed a good detergency.

As can be understood from the foregoing, the present invention can provide a diesel fuel additive composition that is dispersed in a stable manner, eliminates deposits derived from polymeric substances, water soluble deposits and water insoluble deposits at the same time, and do not cause any adverse effects on the object to be cleaned.

55 In Table 4 it was found that the Diesel fuel composition 7 as a comparative example, which does not contain a diesel additive composition, was bad and unacceptable in terms of detergency.

The Diesel fuel composition 8 as a comparative example, which used Sample C1 whose content of component (b) is below the lower limit defined in the present invention as a diesel fuel additive composition 60, was bad and unacceptable as to detergency and stability.

The Diesel fuel composition 9 as a comparative example, which used Sample C2 whose content of component (c) is below the lower limit defined in the present invention as a diesel fuel additive composition, was bad and unacceptable in terms of detergency

65 The Diesel fuel composition 10 as a comparative example, using Sample C3 whose component content (d) is below the lower limit defined in the present invention as a diesel fuel additive composition, was bad and unacceptable as to detergency and stability.

5 The Diesel fuel composition 11 as a comparative example, which used Sample C4 with a content of component (b) above the upper limit defined in the present invention as a diesel fuel additive composition so that the deposits derived from Polymeric substances became viscous, it was bad and unacceptable in terms of detergency.

The composition of Diesel fuel 12 as a comparative example, which used Sample C5 with a content of component (c) above the upper limit defined in the present invention as a diesel fuel additive composition so that the deposits derived from Polymeric substances became viscous, it was bad and unacceptable in terms of detergency.

The Diesel fuel composition 13 as a comparative example, which used Sample C6 with a content of component (d) above the upper limit defined in the present invention as a diesel fuel additive composition so that the deposits derived from Polymeric substances became viscous, it was bad and unacceptable in terms of detergency.

The composition of Diesel fuel 14 as a comparative example, which used Sample C7 whose content of component (e) is below the lower limit defined in the present invention as a diesel fuel additive composition, was bad and unacceptable as to detergency.

The diesel fuel composition 15 as a comparative example, which used Sample C8 whose content

Component (e) is above the upper limit defined in the present invention as a diesel fuel additive composition was bad and unacceptable in terms of detergency, stability and corrosivity.

Diesel fuel composition 16 as a comparative example gave good results in terms of detergency, stability and corrosivity although Sample C9 was used which had a content of component (a)

30 above the upper limit defined in the present invention as a diesel fuel additive composition and which, as a consequence, was considered unacceptable in terms of the low temperature fluidity range mentioned above, because the contents of the other detergent components in the Composition 16 of diesel fuel were within the ranges defined in the present invention.

The composition of Diesel fuel 17 as a comparative example was bad and unacceptable in terms of stability and corrosivity, for this, Sample C10 with a content of component (a) below the lower limit defined in the present invention was used as a composition. of diesel fuel additive.

Claims (5)

1.-A diesel fuel additive composition comprising 5 (a) poly (oxyalkylene alkyl amine) represented by Formula (1) below,

(b)

glycol monoalkylene represented by Formula (2) below,

(C)

glycol dialkylene represented by Formula (3) below,

(d)

a heterocyclic compound, and

(and)

Water;

10 wherein the diesel fuel additive composition contains component (a) of 50 to 80% by weight, said component (b) of 5 to 20% by weight, said component (c) of 5 to 15% by weight , said component (d) of 5 to 15% by weight, and said component (e) of 1 to 5% by weight; in which R1 represents an alkyl group with a carbon number of 8 to 25, each of the A1 and A2 is an alkylene group with a carbon number of 2 to 4, if A1O and / or A2O are repeated, each of the A1 and A2 can be the same or different alkylene group, and kyl represent, respectively, a number from 1 to 30, wherein R2 is an alkyl group with a carbon number of 1 to 8, A3 is an alkylene group with a carbon number of 2 6 3, if A3O is repeated, A3 can be the same or different alkylene group, and m represents a number 25 from 1 to 4, and in which each of the R3 and R4 is an alkyl group with a carbon number of 1 to 8, A4 is an alkylene group 30 with a carbon number of 2 6 3, if A4O is repeated, A4 can be the same alkylene or different group, and n represents a number from 1 to 4. 2. The composition of diesel fuel additive according to claim 1, wherein said component (a) is lauryldiethanolamine. 3. The diesel fuel additive composition according to claim 1, wherein said component (b) comprises one, or two or more selected from the group consisting of ethylene glycol monoethylene ether, diethylene glycol monomethylene ether, monobutylene ether diethylene glycol and dipropylene glycol dimethyl ether. 4. The diesel fuel additive composition according to any one of claims 1 to 3, wherein said component (c) comprises one or two or more selected from the group consisting of diethylene glycol dimethyl ether, diethylene glycol dibutylether and dipropylene glycol dimethyl ether. 5. The diesel fuel additive composition according to any one of claims 1 to 45 4, wherein said component (d) comprises one or two or more selected from the group consisting of N-methyl-2-pyrrolidone, 1, 4-dioxane and γ-butyrolactone. 6. The diesel fuel additive composition according to any one of claims 1 to 5, wherein the content ratio of said component (e) to said component (a) (content 50 (e) / content (a)) is not greater than 0.1. 7. The diesel fuel additive composition according to any one of claims 1 to 6, wherein said diesel fuel additive composition is used to be added 0.5 to 2% by weight of the diesel fuel. 55 8.-A procedure for cleaning and removing a tank derived from a polymeric substance, a water-soluble tank and a water-insoluble tank that adheres to an injector nozzle of a diesel engine equipped with a fuel injector of general intake manifold type, comprising add the diesel fuel additive composition according to any one of 60 claims 1 to 7 of 0.5 to 2% by weight of diesel fuel.