JPH10273683A - Composition for fuel oil and fuel oil additive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition having excellent lubricity, water separability, anti-emulsifiability and environmental suitability and capable of preventing abrasion of diesel engine fuel jet pump, by adding a specific diol compound to a low-sulfur diesel oil. SOLUTION: This composition comprise (A) a compound of the formula R-CH(OH)-CH2 (OH) (R is an 8-30C monovalent hydrocarbon group, pref. a 14-22C (branched) alkyl or alkenyl) and (B) a diesel fuel oil 0.2 wt.% in sulfur content. For example, this composition contains 5-500 (pref. 50-200) ppm of the component A in terms of lubircating performance and addition efficiency. This composition is obtained by directly dissolving and mixing the component A in the component B; alternatively, the component A is made into its kerosene solution about 50 wt.% in concentration, and the solution is, in turn, dissolved and mixed in the component B to obtain the objective composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a fuel oil and an additive having excellent lubricating properties, water separation properties and demulsifying properties. In particular, the present invention relates to a fuel oil composition and a fuel oil additive which are excellent in lubricating properties and water separation properties even in a low-sulfurized diesel fuel oil.

[0002]

2. Description of the Related Art In the late 1960's when hydrogen treatment was introduced as a refining process for kerosene-type jet fuel oil, a problem occurred due to corrosion wear of a fuel injection pump of a jet engine due to lubricity of jet fuel. As a countermeasure, the addition of a corrosion inhibitor such as a fatty acid or a fatty acid ester was effective and employed. However, at present, measures are taken to change the pump material, and the addition of a corrosion inhibitor has been stopped. Similarly, in diesel fuel oil, glycerin or glycol is used to prevent rust.
The addition of the above partial ester with a fatty acid in combination with the fatty acid constituting the ester is disclosed in US Pat.
7,889. In addition, in order to reduce the fuel consumption of diesel engines and reduce the emission of air pollutants, it is common to add a combination of a linear carboxylic acid ester of neopentyl glycol and a linear carboxylic acid having a molecular weight of 125 to 200 in the United States. Patent 4,920,
No. 691.

[0003] In recent years, with respect to diesel fuel, along with stricter exhaust gas regulations for preserving the global environment, reduction of the sulfur content in diesel fuel oil has been promoted. The reduction in the sulfur content of diesel fuel oil has been realized by reducing sulfur-containing aromatic components such as benzothiophene by hydrogen treatment, as in the case of kerosene-type jet fuel. The sulfur-containing aromatic component contributes to the lubricity of the diesel fuel oil, and the diesel fuel oil containing a small amount of the sulfur-containing aromatic component has a reduced lubricity. For this reason, the lubricating property decreases as the sulfur content decreases, and engine troubles due to wear of the fuel injection pump occur. As a countermeasure, a diesel fuel oil to which the same fatty acid ester as that used for the kerosene-type jet fuel is added has been studied.

[0004]

However, conventional additives, such as fatty acid esters, added to improve the lubricity of the fuel injection pump are insufficient in lubricity and deteriorate water separation properties, and are satisfactory. In some cases, diesel fuel oil with a low sulfur content cannot be obtained.

[0005]

Means for Solving the Problems As a result of intensive studies on this problem, the present inventors have found that by adding a diol compound having a specific chemical structure, a low sulfur having a sulfur content of 0.2% by weight or less can be obtained. It has been found that the lubricated diesel fuel oil has excellent lubricity and also has excellent water separation properties.

That is, the present invention provides a fuel oil composition comprising a diol compound (A) represented by the general formula (1) and a diesel fuel oil (B) having a sulfur content of 0.2% by weight or less; The diol compound (A) represented by (1)
The diesel fuel additive having a sulfur content of 0.2% by weight or less. R—CH (OH) —CH ₂ (OH) (1) wherein R represents a monovalent hydrocarbon group having 8 to 30 carbon atoms. ]

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The diol compound (A) represented by the general formula (1) of the present invention is obtained by converting an α-olefin having a hydrocarbon group represented by R into an α-olefin prepared by oxidation such as air oxidation. It can be prepared by hydrolyzing olefin oxide and ring opening.

R in the general formula (1) is a hydrocarbon group having 8 to 30 carbon atoms, preferably an alkyl group having 14 to 22 carbon atoms or an alkenyl group having at least one double bond. The alkyl group is more preferably a branched one.

When the carbon number of R in the general formula (1) is less than 8 or more than 30, the solubility in diesel fuel oil having a sulfur content of 0.2% by weight or less is insufficient.

[0010] Specific examples of the low-sulfurized diesel fuel oil (B) having a sulfur content of 0.2% by weight or less in the present invention include ordinary distillation of low-sulfur crude oil (for example, southern crude oil such as Minas crude oil). JIS No. 1 light oil obtained, JIS2
No. 3 gas oil, JIS No. 3 gas oil, JIS No. 3 gas oil; desulfurized gas oil produced from ordinary crude oil through a hydrodesulfurization treatment process;
JIS1 produced from a gas oil fraction obtained by blending this desulfurized gas oil with a straight-run gas oil (the gas oil before the hydrodesulfurization step)
No. light oil, JIS No. 2 light oil, JIS No. 3 light oil, JIS special 3
No. light oil. Particularly preferably, JIS No. 1 gas oil, JIS No. 2 gas oil, JIS gas oil produced using 50% by weight or more of desulfurized gas oil produced through a hydrodesulfurization treatment step.
No. 3 light oil, JIS special No. 3 light oil.

The content of the diol compound (A) in the fuel oil composition of the present invention is usually from 5 to 500 ppm, preferably from 50 to 200 p, from the viewpoint of lubrication performance and addition efficiency.
pm.

The fuel oil composition of the present invention can be prepared by directly dissolving and mixing the diol compound (A) with a diesel fuel oil (B) having a sulfur content of 0.2% by weight or less. Also, the diol compound (A) was made into a kerosene solution having a concentration of about 50% by weight, and this was added with a sulfur content of 0.2%.
The fuel oil composition of the present invention can also be prepared by dissolving and mixing with the diesel fuel oil (B) which is less than or equal to the weight%.

The fuel oil of the present invention may contain other known additives. These known additives include, for example, flow improvers (eg, EVA flow improvers, alkenyl succinamide flow improvers, polymethacrylate flow improvers), detergents (eg, dibutylamine Examples include ethylene oxide adducts, ethylene oxide adducts of butanol), rust preventives (for example, alkenyl succinic acid-based rust preventives, alkenyl succinic acid ester-based rust preventives), and antioxidants.

The water separation property and the demulsifying property of the fuel oil composition can be evaluated by the water solubility test method of JIS K 2276 “Aero fuel oil test method”. JIS K22
As described in 76, take 80 ml of the sample and 20 ml of the buffer solution in a 100 ml measuring cylinder with a stopper, shake under the prescribed conditions, and display the change in the volume of the buffer solution after standing, the state of the interface, and the separation state. 1. Evaluation was performed according to Table 2.

[0015]

[Table 1]

[0016]

[Table 2]

The lubricating properties of diesel fuel oil can be measured by a conventional frictional wear evaluation table test method, for example, a test using a Falex block-on-ring friction / wear tester, BOCL
Test using E tester (ASTM D5001), SR
HFRR developed to test lubrication of diesel fuel oil using a V tester (manufactured by Optimol, Germany)
It can be evaluated by tests and the like. In particular, the HFRR test (UK P
Evaluation by CS Instruments, Inc. has a high correlation with actual fuel pump wear and is widely used.

[0018]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In the examples, parts and% represent parts by weight and% by weight, respectively.

Production Example 1 [Preparation of Hydrolyzate of Propylene Tetramer Oxide] 100 g of commercially available propylene tetramer oxide, 50 g of water, and 0.5 g of paratoluenesulfonic acid were charged into a reaction vessel equipped with a stirrer, heated and refluxed for 2 hours. I let it. After cooling, the upper layer separated into two layers was placed in another container and dried under reduced pressure to prepare a hydrolyzate of propylene tetramer oxide (S-1).

Production Example 2 [Preparation of propylene pentamer oxide hydrolyzate] Propylene pentamer oxide hydrolyzate (S) was prepared in the same manner as in Production Example 1 except that propylene tetramer oxide was changed to propylene pentamer oxide. -2) was prepared.

Production Example 3 [Preparation of hydrolyzate of propylene octamer oxide] A hydrolyzate of propylene octamer oxide (S) was produced in the same manner as in Production Example 1 except that propylene tetramer oxide was changed to propylene octamer oxide. -3) was prepared.

Production Example 4 [Preparation of hydrolyzate of α-olefin oxide having 12 carbon atoms]
Production example except that α-olefin oxide was changed to
In the same manner as in Example 1, a hydrolyzate of an α-olefin oxide having 12 carbon atoms (S-4) was prepared.

Production Example 5 [Preparation of hydrolyzate of alkenyl-substituted ethylene oxide having 22 carbon atoms] A method similar to that of Production Example 1 was used, except that propylene tetramer oxide was changed to alkenyl-substituted ethylene oxide having 22 carbon atoms. Hydrolysis product of alkenyl-substituted ethylene oxide having 22 carbon atoms (S-
5) was created.

Comparative Production Example 1 [Preparation of hydrolyzate of propylene dimer oxide] A hydrolyzate of propylene dimer oxide (R-1) was produced in the same manner as in Production Example 1 except that propylene tetramer oxide was changed to propylene dimer oxide. )made.

Comparative Production Example 2 [Preparation of hydrolyzate of α-olefin oxide having 36 carbon atoms]
Production example except that α-olefin oxide was changed to
In the same manner as in Example 1, a hydrolyzate of an α-olefin oxide having 36 carbon atoms (R-2) was prepared.

Examples 1 to 5 Sanso-containing compounds S-1 to S-5 were added to diesel fuel oil equivalent to JIS No. 3 having a sulfur content of 0.04% by weight.
By dissolving 300 ppm, fuel oils of Examples 1 to 9 were prepared. All of the obtained fuel oils were transparent, and no blemishes were observed. An HFRR wear test was performed on the nine fuel oils under the conditions of a temperature of 60 ° C., a stroke length of 1 mm, a frequency of 50 Hz, and a time of 75 minutes, and the friction coefficient and the size of wear marks were measured. Further, the obtained fuel oil was evaluated for water separation property and demulsification property according to the water solubility test method described in JIS K 2776. In addition, a blank test using only diesel fuel oil without any addition was also performed. Table 3 shows the evaluation results.

Comparative Examples 1 to 4 R-1 and R-2 obtained in Comparative Production Examples were dissolved at a concentration of 200 ppm in the same manner as in the Examples, and the fuel oils of Comparative Examples 1 and 2 and ethylene glycol (R- 3) 200p
pm, and propylene glycol (R-4) 200p
The fuel oils of Comparative Examples 3 and 4 dissolved at a concentration of pm were prepared, and abrasion test by HFRR method and JIS K27
The water separation property was evaluated by a water solubility test according to No. 76.
Table 3 shows the results.

As is evident from Table 3, the diesel fuel oil composition of the present invention has a small coefficient of friction and a small wear mark, is extremely excellent in lubricity as compared with a blank containing no added oil, and has a water separation property. It can be seen that they are also excellent in the properties and the demulsifying properties.

[0029]

[Table 3]

[0030]

Industrial Applicability The fuel oil composition of the present invention has excellent lubricating properties as well as excellent water separation properties and demulsifying properties. Due to environmental problems such as acid rain, regulations such as reduction of sulfur will be strengthened in the future. However, even if it is used in the same manner as the conventional diesel fuel, engine trouble due to wear of the fuel injection pump of the diesel engine can be prevented.

Claims (5)

[Claims] 1. A fuel oil composition comprising a diol compound (A) represented by the general formula (1) and a diesel fuel oil (B) having a sulfur content of 0.2% by weight or less. R—CH (OH) —CH ₂ (OH) (1) wherein R represents a monovalent hydrocarbon group having 8 to 30 carbon atoms. ] 2. The composition according to claim 1, wherein in the general formula (1) of (A), R is an alkyl or alkenyl group having 12 to 22 carbon atoms. 3. The composition according to claim 1, wherein 50% by weight or more of (B) is a hydrodesulfurized gas oil. 4. The composition according to claim 1, wherein the content of (A) in the fuel oil composition is 5 to 500 ppm. 5. An additive for a low sulfur fuel oil comprising a diol compound (A) represented by the general formula (1) and having a sulfur content of 0.2% by weight or less. R—CH (OH) —CH ₂ (OH) (1) wherein R represents a monovalent hydrocarbon group having 8 to 30 carbon atoms. ]