JPH0235000B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fuel composition for a diesel engine, and more particularly, a fuel composition for a diesel engine, which is made by adding a specific polyoxyalkylene compound to light oil as an essential component, and which significantly reduces HC and CO concentrations and particulate matter in exhaust gas. Regarding. Currently, regarding exhaust gas from diesel engines in Japan, the emissions of HC, CO, NO, and black smoke are regulated. In contrast, in the United States, small diesel engines are regulated based on the exhaust weight of particulate matter instead. Note that particulates are fine particles contained in exhaust gas, most of which are carbon particles, but they also contain hydrocarbon components with relatively high boiling points produced by partial combustion of fuel. Measures to reduce particulate matter also reduce black smoke.
This is an important issue related to measures to reduce HC concentration. Mere measures to reduce black smoke and HC are not sufficient to reduce particulate matter, and currently a method has been devised to collect particulate matter by installing a ceramic filter in the middle of the exhaust pipe. However, this method has the disadvantage that particulate accumulates in the filter as the filter continues to operate, resulting in increased back pressure. Additionally, devices are being developed that automatically burn this accumulated soot using catalysts, burners, etc., but the control mechanism is extremely difficult, and there are additional problems such as increased weight and cost. Therefore, there has been a need for an easy and inexpensive method for reducing particulate matter. The inventors of the present invention focused on this measure to reduce particulate matter, and as a result of repeated research to invent a method to reduce particulate matter easily and without much cost, the inventors added a specific polyoxyalkylene compound of light oil as an essential component. By using this as fuel for diesel engines,
The inventors discovered that not only the particulate matter in exhaust gas but also the CO concentration and HC concentration can be significantly reduced, leading to the completion of the present invention. The present invention applies the general formula to light oil.

[expression] or

[Formula] [In the formula, R ₁ is a group in which 1 to 2 hydrogen atoms of a hydrocarbon group containing 1 to 10 carbon atoms are substituted with a hydroxyl group and/or an amino group, general formula

[Formula] (wherein R ₄ represents a group in which 1 to 2 hydrogen atoms of a hydrocarbon group containing 1 to 9 carbon atoms are substituted with a hydroxyl group and/or an amino group) , and the general expression

[Formula] (wherein R ₅ is a hydrocarbon group containing 1 to 9 carbon atoms, or 1 to 2 hydrogen atoms of this hydrocarbon group are hydroxyl groups and/or
or a hydrocarbon group substituted with an amino group)
A group selected from the group consisting of the groups represented by R ₂
is an alkyl group having 2 to 5 carbon atoms, and R ₃ is an alkyl group having 1 to 5 carbon atoms.
30 hydrocarbon groups and n is an integer of 5 to 40, respectively] with an average molecular weight of 400 to 6000 as an essential component and 0.05
The present invention provides a fuel composition for a diesel engine, in which an amount of ~5% by weight is added. Hereinafter, the content of the present invention will be explained in more detail. The term "light oil" as used in the present invention refers to a petroleum fraction used as fuel for diesel engines, for example, with a boiling point range of approximately 190 to 380 degrees Celsius, and typical examples include No. 1 to 3 light oil as specified in JISK2204. It is something. In addition, the polyoxyalkylene compound referred to in the present invention has the general formula Average molecular weight expressed by 400 to 6000, preferably
700-3000 compounds. (1) In the formula, R ₁ is a hydrocarbon group containing 1 to 10 carbon atoms in which 1 to 2 hydrogen atoms are substituted with a hydroxyl group and/or an amino group, general formula

[Formula] (wherein R ₄ represents a group in which 1 to 2 hydrogen atoms of a hydrocarbon group containing 1 to 9 carbon atoms are substituted with a hydroxyl group and/or an amino group) groups, and general formulas

[Formula] (wherein R ₅ is a hydrocarbon group containing 1 to 9 carbon atoms, or 1 to 2 hydrogen atoms of this hydrocarbon group are hydroxyl groups and/or
or a hydrocarbon group substituted with an amino group)
Indicates a group selected from the group consisting of the groups represented by. Examples of the hydrocarbon group here include an alkyl group, an alkenyl group, a cycloalkyl group, an alkylcycloalkyl group, an aryl group, an alkylaryl group, and an aralkyl group. In the present invention, R ₁ is represented by the general formula

Represented by [formula] group, general formula

A group represented by the formula is preferred. Specifically, for example, methylcarbamoyl group,
Ethylcarbamoyl group, propylcarbamoyl group, butylcarbamoyl group, pentylcarbamoyl group, hexylcarbamoyl group, heptylcarbamoyl group, octylcarbamoyl group, nonylcarbamoyl group, decylcarbamoyl group, cyclohexylcarbamoyl group, phenylcarbamoyl group and general formula Examples include a group represented by [wherein R ₆ represents an alkylene group having 2 to 4 carbon atoms]. In the present invention, the above general formula is particularly preferable as R ₁

[Performance evaluation test]

Using the fuel composition to operate a diesel engine with a displacement of 1800 c.c., the dynamo outputs were 2.0, 4.0, and 6.0 ps at a vehicle speed of 30 km/hr, and the dynamo outputs were 6.0, 8.0, and 10.0 ps at a vehicle speed of 50 km/hr. The HC concentration, CO concentration, and particulate amount in the exhaust gas were measured. However, the measurement of HC concentration, CO concentration, and particulate amount was carried out by the following method. ●HC concentration and CO concentration After the diesel engine was warmed up for 90 minutes, the exhaust gas was introduced into the dilution tunnel, and the exhaust gas was sampled for 5 minutes at a constant engine speed and torque condition. this gas
Federal Register VOL.45, No.45 (March
The concentration was determined by analysis according to the method described in 40 CFR PART 86 of 5, 1980). ●Amount of particulate matter Exhaust gas was passed through the filter for 2 to 5 minutes under the same conditions as above, and particulate matter was collected. This filter is kept at constant temperature (25℃) and constant humidity (60℃).
%) for 18 hours, the weight was determined using a microbalance and the weight of the filter was subtracted. Examples 2 to 5 and Comparative Example Compositions of the present invention were obtained by adding 1% by weight of each of polyoxyalkylene compounds (Examples 2 to 5) represented by the following formulas to JIS No. 2 gas oil. Tables 1 and 2 show the results of the same performance evaluation tests as in Example 1 for these fuel compositions.
Shown in the table. For comparison, a similar performance evaluation test was conducted using only No. 2 diesel oil without adding these polyoxyalkylene compounds, and the results are also listed in Tables 1 and 2. From the results in Tables 1 and 2, the fuel composition of the present invention has significantly reduced HC concentration, CO concentration, and particulate amount in exhaust gas, compared to light oil to which no polyoxyalkylene compound is added. Its excellence is clear.

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Claims (1)

[Scope of Claims] 1 Light oil has the general formula [Formula] or [Formula] (wherein R ₁ is 1 to 2 hydrocarbon groups containing 1 to 10 carbon atoms)
A group in which 1 to 2 hydrogen atoms are substituted with a hydroxyl group and/or _an amino group, with the general formula (representing a group in which an atom is substituted with a hydroxyl group and/or an amino group), and a group represented by the general formula [Formula] (wherein R ₅ is a hydrocarbon group containing 1 to 9 carbon atoms, or A group selected from the group consisting of a hydrocarbon group in which 1 to 2 hydrogen atoms of the hydrocarbon group are substituted with a hydroxyl group and/or an amino group, R ₂ is a group having 2 to 5 carbon atoms. R ₃ is a hydrocarbon group having 1 to 30 carbon atoms, and n is an integer of 5 to 40], and has an average molecular weight of 400 to 6000 as an essential component. A diesel engine fuel composition containing %.