JPH0967583A - Diesel gas oil composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a diesel gas oil compsn. which stably exhibits excellent low-temp. fluidity even in the case of a small kerosene fraction content by adding a surfactant fluidity improver to a diesel gas oil having particular properties. SOLUTION: This diesel gas oil compsn. comprises a diesel gas oil satisfying the formula Y<=-0.0051X<2> +0.50 (wherein Y represents the percentage precipitation of wax (wt.%/ deg.C); and X represents the cloud point ( deg.C)) and a surfactant fluidity improver added thereto. The amount of the surfactant fluidity improver added is pref. 20 to 2000mg/L. Pref. surfactant fluidity improvers usable herein include an alkenylsuccinic amide or alkenylsuccinic imide compd., an ester of a nitrogen-contg. compd. having a hydroxyl group with a straight-chain satd. fatty acid, and a polymer of this compd. with at least one member selected from the group consisting of an olefin, an ethylenically unsatd. alkyl carbonate, and a satd. fatty acid vinyl ester.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a diesel gas oil composition, and more particularly to a gas oil composition for diesel engines used in automobiles, ships, generators and the like.

[0002]

2. Description of the Related Art In recent years, the demand for light oil, which is a fuel for diesel engines, has been increasing, while the demand for heavy oil has been decreasing. Therefore, the cutup of light gas oil and the heavy gas oil fraction contained in conventional heavy oil have been replaced by gas oil. It is desired to increase the production of light oil by including it in the oil. However, when the heavy gas oil fraction is included in the gas oil, the wax in the gas oil increases and the low temperature fluidity deteriorates. Therefore, it is practically difficult to use such a light oil as it is as a fuel oil for diesel in cold weather or in cold regions, and attempts have been made to improve low temperature fluidity by adding a fluidity improver. .

As a fluidity improver, for example, Japanese Examined Patent Publication No. 56
The ethylene-vinyl acetate copolymer, which is described in Japanese Patent No. 18634 and is widely used at the present time, has an additive effect on gas oil containing a large amount of kerosene fraction, but an additive effect on gas oil containing no kerosene fraction. There is no. Since kerosene is used for heating in winter, when it is used as a light oil base, there is a problem that the kerosene supply is tight. Therefore, development of diesel oil for diesel engines, which has a low kerosene fraction and excellent low-temperature fluidity, has been desired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made from the above viewpoint, and an object thereof is to provide a diesel gas oil composition which is stable and has excellent low-temperature fluidity even when the kerosene fraction is small. It is a thing.

[0005]

Means for Solving the Problems As a result of earnest studies, the inventors of the present invention have effectively achieved the above object of the present invention by adding a surfactant fluidity improver to diesel diesel oil having specific physical properties. The inventors have found what can be achieved and have completed the present invention. That is, the present invention provides a diesel gas oil composition obtained by adding a surfactant fluidity improver to gas oil satisfying the following formula (1).

Y ≦ −0.0051X ² +0.50 (1) Here, Y represents the wax deposition rate (wt% / ° C.), and X
Represents a cloud point (° C.). Further, it is preferable that Y ≧ 0.25 and X ≦ 2, and the addition amount of the surfactant-based fluidity improver is preferably 20 to 2,000 mg / liter.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The light oil used in the present invention must satisfy the above formula (I). Here, Y is the wax deposition rate (wt% /
C.), and refers to the amount of wax (% to light oil) that increases when the temperature of the light oil is lowered by 1 ° C. when the light oil is cooled below the cloud point. The characteristics of the present invention are particularly exhibited when Y is 0.25 or more. That is, when Y is 0.25 or more, the kerosene is not mixed with the light oil, and the production of kerosene can be increased in the winter season, which is the demand period for kerosene, which is preferable. However, even if the kerosene fraction is mixed to some extent, it is naturally included in the scope of the present invention. In addition,
Mixing the kerosene fraction with diesel oil here means mixing the kerosene with a distilling device to lower the cut point of kerosene and diesel oil (lowering the 95% distillation point of the kerosene fraction). It also means the case of adding oil to light oil.

Next, X represents a cloud point (° C.), which is the temperature at which wax begins to precipitate, and is defined by JISK 2269. This X is preferably 2 or less 2
If it exceeds, there is a possibility that diesel vehicle main filter blockage trouble may occur. Examples of the base material of the gas oil of the present invention include straight-run gas oil (LGO) and desulfurized gas oil (DG).
O), indirect desulfurization gas oil (VHLGO), hydrocracking gas oil (HCGO), catalytic cracking gas oil (LCO), direct desulfurization gas oil (DSGO), kerosene, etc. are usually used by mixing two or more kinds.

The surfactant type fluidity improver of the present invention means a fluidity improver having a hydrophilic group such as amine, amide and imide group and a hydrophobic group such as linear alkyl group, and is an alkenyl succinic acid amide type. An alkenyl succinimide compound can be used. Further, as the fluidity improver, (A)
An ester compound of a nitrogen-containing compound having a hydroxyl group and a linear saturated fatty acid, or at least one monomer selected from (B) an olefin, an ethylenically unsaturated alkyl carboxylate and a saturated fatty acid vinyl as the component (A). Those obtained by adding the obtained polymer can be suitably used.

As the nitrogen compound constituting the ester compound of the straight chain saturated fatty acid and the nitrogen compound having a hydroxyl group, which is the component (A), those having 2 to 10 hydroxyl groups are preferably used. When the number of hydroxyl groups deviates from the above range, the effect of improving fluidity is small. Examples of such nitrogen compounds include compounds selected from diethanolamine, methyldiethanolamine, ethyldiethanolamine, triethanolamine, ethylenediamine, propyldiamine, and epoxide adducts thereof. Examples of the epoxide of the epoxide adduct include ethylene oxide and propylene oxide.

The linear saturated fatty acid having 12 to 30 carbon atoms is used as the linear saturated fatty acid which constitutes the ester compound of the nitrogen compound having a hydroxyl group and the linear saturated fatty acid as the component (A). be able to. Examples of such linear saturated fatty acids include palmitic acid, stearic acid, arachidic acid, behenic acid, and the like, and hardened beef tallow fatty acid, hardened rapeseed oil fatty acid, hardened fish oil fatty acid and the like containing them can also be used.

The ester compound can be obtained by esterifying the nitrogen compound having a hydroxyl group and the linear saturated fatty acid by a usual method. (B)
Examples of the olefin used as a monomer of a polymer obtained from at least one monomer selected from olefin, an ethylenically unsaturated alkyl carboxylate and a saturated fatty acid vinyl as a component include ethylene, propylene, butene-1 and the like. However, examples of the unsaturated carboxylic acid of the ethylenically unsaturated alkyl carboxylate include acrylic acid, methacrylic acid, and itaconic acid, and examples of the saturated fatty acid vinyl include vinyl formate, vinyl acetate, vinyl propionate, and the like. .

The above-mentioned polymer can be obtained by polymerizing one kind or a mixture of two or more kinds of the above-mentioned monomers by a usual method. In the present invention, a polymer having a number average molecular weight of 1,000 to 20,000 can be used as the above polymer. When the number average molecular weight is out of the above range, the fluidity improving effect is small. In the present invention, when the component (B) is added to the component (A), the component (A) is preferably 30% by weight or more based on the total amount of the components (A) and (B). If this amount is less than 30% by weight, the effect of improving fluidity is small.

In the present invention, the amount of the surfactant type fluidity improver added is preferably 20 to 2,000 mg / liter, more preferably 20 to 500 mg / liter. If this value exceeds the upper limit, the solubility in light oil will be poor and the effect commensurate with the amount added will not be obtained. On the other hand, if it is less than the lower limit, the effect of improving the fluidity is reduced. In the gas oil composition of the present invention, if necessary, a detergent, a cetane number improver, an antioxidant, a metal deactivator, another fluidity improver, an antifreezing agent, within a range that does not impair the effects of the present invention. Corrosion inhibitor,
Additives such as a rust preventive agent, a coloring agent, and a marker can be appropriately added.

[0015]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the invention thereto. Examples 1 to 5 and Comparative Examples 1 to 5 400 mg / liter of the fluidity improver shown in Table 2 was added to light oil blended with the light oil base material shown in Table 1, before and after the addition of the fluidity improver. Was measured for clogging point (CFPP) and pour point, and the difference between before and after addition is shown in Tables 3 and 4 as the fluidity improving effect. The lower the value of CFPP, the less likely it is that the diesel vehicle fuel system filter will be clogged with wax, and the lower the pour point of the pour point, the less likely that the diesel vehicle fuel system will be clogged due to the solidification of light oil. It can be said that the larger the difference between before and after the addition, the greater the effect of improving the fluidity.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

[Table 4]

[0020]

[Table 5]

As is clear from Tables 3 and 4, when a surfactant fluidity improver is added to gas oil satisfying the above formula (1), a diesel gas oil composition having a great fluidity improving effect can be obtained. I understand. Therefore, a diesel gas oil composition having excellent low temperature fluidity can be obtained by adjusting the addition amount of the fluidity improver. The properties and performance of light oil were determined by the following methods.

(1) Cloud Point The cloud point was measured according to JIS K 2269. (2) Wax deposition rate 20 g of a sample was weighed in a cooling filter and cooled to a test temperature,
After filtration under reduced pressure, the paraffin wax on the filter is washed with cold acetone to remove oil. Next, the paraffin wax was dissolved with n-pentane and transferred to a weighing flask.
-Evaporate the pentane, weigh the remaining paraffin wax and calculate the amount of wax by the following formula. The test temperature is set to 3 or more of cloud point-2, cloud point-4, and cloud point-6, and the test temperature is plotted on the horizontal axis and the wax amount on the vertical axis. Obtain a straight line showing the relationship between the two by the least squares method,
The absolute value of this gradient is defined as the wax deposition rate. (3) Measured according to CFPP JIS K 2288. (4) Pour point It was measured according to JIS K 2269. (5) Distillation point It was measured according to ASTM D2887.

[0023]

According to the present invention, it is possible to provide a gas oil composition having a stable fluidity even with a small kerosene fraction. It is possible to increase production.

Claims (4)

[Claims] 1. A diesel gas oil composition obtained by adding a surfactant fluidity improver to a diesel gas oil satisfying the following formula (1). Y ≦ −0.0051X ² +0.50 (1) Here, Y represents the wax deposition rate (wt% / ° C.), and X
Represents a cloud point (° C.). 2. The addition amount of the surfactant type fluidity improver is 2
The diesel gas oil composition according to claim 1, which is 0 to 2,000 mg / liter. 3. The diesel fuel oil composition according to claim 1, wherein Y ≧ 0.25 in the formula (1). 4. The diesel gas oil composition according to claim 1, wherein X ≦ 2 in the formula (1).