JPH08283754A - Fuel oil composition - Google Patents

Abstract

PURPOSE: To effectively stabilize the hue and suppress sludge formation by adding N-methyldicyclohexylamine (A) and N,N'-disalicylidene-1,2- propanediamine (B) to a fuel oil containing at least a given amount of a distillate obtained by the thermal and/or catalytic cracking of heavy oil. CONSTITUTION: The fuel oil contains 3vol.% or more of the distillate. A preferred volume ratio of component A to component B is 20 to 80-80 to 20. The total amount of components A and B to be added is 5-500ppm. The fuel oil containing 3vol.% or more of the distillate obtained by cracking heavy oil includes kerosene, gas oil, A oil, etc., that contain distillates (cracked distillates) obtained by decomposing heavy distillate, among distillates (straight distillates) obtained by subjecting crude oil directly to atmospheric or vacuum distillation, or residual oil by catalytic cracking. In addion to these additives, the fuel oil composition may also contain an antioxidant (e.g. amino antioxidant), cetane number improver (e.g. aliphatic hydrocarbons), low-temperature flowability improver, and corrosion inhibitor.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fuel oil composition containing a distillate oil obtained by catalytic cracking and / or thermal cracking of a heavy oil in an amount of 3% by volume or more and having improved hue stability and sludge suppression effect. It is about things.

[0002]

2. Description of the Related Art Heavy oil is processed by the visbreaking method, full
Pyrolysis method such as doco-king method, flexi-coking method, delayed coking method, and Yurika method and / or U
OP catalytic cracking method, flexi cracking method, ultra
Fuel oil containing 3% by volume or more of distillate oil obtained by cracking by catalytic cracking method such as ortho-flow method, especially 5% by volume
The fuel oils contained above are prone to coloration and sludge generation during storage, which causes various obstacles when used. As a method of improving the stability of such a fuel oil, a method of using an oil-soluble alkaline earth metal compound alone as a stabilizer or a method of using this compound in combination with N, N′-disalicylidene-1,2-propanediamine ( For example, Japanese Patent Publication No. 4-17238), a method of blending a diamine compound (for example, Japanese Patent Publication No. 3-44595),
A method in which a condensate of a dialkylamine and an aliphatic aldehyde, a condensate of an alkylphenol and a diaminoalkane, and N, N'-disalicylidene-1,2-propanediamine are used in combination with each other (for example, JP-A-63-386). Gazette), N, N-dimethylcyclohexylamine and N,
A method using N'-disalicylidene-1,2-propanediamine in combination (for example, Japanese Patent Publication No. 44-12034) has been proposed.

[0003]

Among these, the alkaline earth metal-containing material in the above method is the hue stability of fuel oil containing 3% by volume or more of distillate oil obtained by cracking of heavy oil and sludge suppression. Although it exerts a good effect for improving the effect, there is a concern that the inside of the internal combustion engine may be contaminated by ash content after combustion, and there are problems such as safety of metal components. Therefore, there is a demand for an additive that does not leave ash after combustion, but it cannot be said that the conventional method that does not leave ash ~ has sufficient effect for improving hue stability and sludge suppression. .

[0004]

DISCLOSURE OF THE INVENTION The present inventors have developed a distillate oil obtained by thermally cracking and / or catalytically cracking a heavy oil to obtain 3
The present invention has been achieved as a result of extensive studies on a fuel oil composition that sufficiently exhibits the effects of hue stability and sludge suppression of a fuel oil containing at least vol%.

That is, according to the present invention, N-methyldicyclohexylamine and N, N'-disalicylidene-1 are added to a fuel oil containing distillate oil obtained by thermal cracking and / or catalytic cracking of heavy oil in an amount of 3% by volume or more. , 2-propanediamine.

[0006] Even if these compounds are separately added to the fuel oil containing distillate oil obtained by thermal cracking and / or catalytic cracking of heavy oil in an amount of 3% by volume or more,
A mixture of these compounds may be added.

The preferred volume ratio of N-methyldicyclohexylamine and N, N'-disalicylidene-1,2-propanediamine in the fuel oil composition is 20 / 80-80.
/ 20, more preferably 30/70 to 70/3
0.

The total amount of N-methyldicyclohexylamine and N, N'-disalicylidene-1,2-propanediamine added to the fuel oil is usually 5 to 500 ppm, and when used in this range, color stability is obtained. The effect of improving the property and sludge suppression is sufficiently exerted. 50
The case of 0 ppm or more is also included in the present invention but is often saturated, which is economically disadvantageous.

The fuel oil containing 3% by volume or more of the distillate obtained by decomposing the heavy oil in the present invention is a distillate obtained by directly distilling crude oil under atmospheric pressure or under reduced pressure (straight distillation). Of the heavy distillate oil or the residual oil is subjected to a thermal decomposition method such as a visbreaking method, a full-coking method, a flexico-king method, a delayed-coking method, a Yurika method and / or UOP. Kerosene, light oil, heavy oil A, etc. containing a distillate (cracked fraction) obtained by cracking by a catalytic cracking method such as a catalytic cracking method, a flexi cracking method, or an ultra ortho flow method can be mentioned.

In addition to the additives of the present invention, antioxidants (eg, amine-based, phenol-based, etc.), cetany improvers (eg, aliphatic hydrocarbon-based, ester-based, ether-based, etc.), low temperature Other additives such as a fluidity improver (for example, ethylene-vinyl acetate copolymer, a fatty acid ester of an alkylene oxide adduct of polyhydric alcohol, etc.) and a corrosion inhibitor may be used in combination.

[0011]

The present invention is described in detail below with reference to examples, but the present invention is not limited thereto. In the examples,% represents% by volume.

Examples 1 to 3 10 cracking gas oils obtained by fluid catalytic cracking of heavy oils were used.
% Fuel oil containing 100 ppm of a mixture of N-methyldicyclohexylamine and N, N'-disalicylidene-1,2-propanediamine in a volume ratio of 50/50, 30/70, 70/30. Compositions were made and made into Examples 1 to 3 of the present invention.

Comparative Example 1 10 parts of cracked gas oil obtained by fluid catalytic cracking of heavy oil was used.
Comparative Example 1 was a fuel oil composition in which 100 ppm of N, N-dimethylcyclohexylamine was added to 100% of the light oil.

Comparative Example 2 10 parts of cracked gas oil obtained by fluid catalytic cracking of heavy oil was used.
% Of light oil, N, N-dimethylcyclohexylamine and N, N'-disalicylidene-1,2-propanediamine were mixed at a volume ratio of 50/50 to obtain 100 pp.
The fuel oil composition added with m was designated as Comparative Example 2.

Stability test 400 ml of light oil (A) containing 10% of cracked light oil obtained by decomposing heavy oil and 400 ml of the fuel oil composition of Examples 1 to 3 and Comparative Examples 1 to 2 was added to 500 ml of metal. Put it in a container and cover it with a hole for air intake.
It was stored for 1 month with the light kept out of the air in a controlled air bath.
Hue stability is a spectrophotometer specified in JIS K0115,
Evaluation by measuring the absorbance at a wavelength of 470 nm. The sludge suppressing effect was evaluated by filtering with a Millipore filter (manufactured by Millipore). Table 1 shows the test results.
Shown in

[0016]

[Table 1] In the table, the smaller the values of absorbance and sludge amount, the better the stability.

[0017]

INDUSTRIAL APPLICABILITY The fuel oil composition of the present invention is extremely excellent in hue stability and sludge suppression of fuel oil containing 3% by volume or more of distillate oil obtained by decomposing heavy oil, as compared with conventional fuel oil compositions. It is valid.

Claims (3)

[Claims] 1. A fuel oil containing 3% by volume or more of a distillate oil obtained by thermal cracking and / or catalytic cracking of a heavy oil is added to N-methyldicyclohexylamine and N, N′-disalicylidene-1,2- A fuel oil composition to which propanediamine is added. 2. N-methyldicyclohexylamine and N, N'-disalicylidene-based on the volume of the fuel oil.
The total amount of addition with 1,2-propanediamine is 5ppm
The fuel oil composition according to claim 1, which is about 500 ppm. 3. The fuel oil composition according to claim 1, wherein the volume ratio of N-methyldicyclohexylamine and N, N′-disalicylidene-1,2-propanediamine is 20/80 to 80/20.