JPS61166886A - Gasoline composition - Google Patents

Abstract

PURPOSE:A gasoline composition having improved preventing effect on smoking of an ignition plug of gasoline engine, obtained by blending a specific gasoline fraction with a specific amount of an alkaline earth metal sulfonate. CONSTITUTION:(A) A gasoline fraction having >=35vol% aromatic group content, having 85-125 deg.C distillation fraction of 50% is blended with (B) 0.01-10wt% (preferably 0.05-0.5wt%) alkaline earth metallic salt (e.g., extremely basic calcium petroleum sulfonate, etc.) of an alkyl aromatic sulfonic acid having usually 100-700mol.wt., to give the aimed gasoline composition.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gasoline composition, and more particularly to a gasoline composition that is excellent in preventing smoldering of a spark plug for a gasoline engine.

BACKGROUND OF THE INVENTION In gasoline engines, particularly those using unleaded gasoline, a phenomenon known as spark plug smoldering can occur. What is the smoldering of this spark plug?
This is a phenomenon in which the insulator legs and electrodes of a spark plug become covered with dry carbon, and this is likely to occur in winter when the outside temperature is low. When a smoldering spark plug occurs, the engine has trouble starting, becomes unstable at low speeds, has poor acceleration, and in the worst case scenario can cause the engine to stall.

It is also known that smoldering of the spark plug is more likely to occur as the aromatic content of the gasoline used increases and as the heaviness of the gasoline increases.

Conventionally, in order to prevent spark plugs from smoldering in gasoline engines, it is important to use appropriate spark plugs (heat value and structure), and prevent overheating! Methods such as not continuing to operate under I mixture condition (choke activated) for a long time were known, but there is an easier way to prevent spark plugs from smoldering, which does not depend on the type of spark plug or operating conditions. A method was needed.

Problems to be Solved by the Invention The inventors of the present invention have focused on gasoline, which is the fuel for gasoline engines, and have conducted repeated research to develop a gasoline that is highly effective in preventing spark plugs from smoldering. The inventors have discovered that a gasoline composition with an excellent effect of preventing spark plugs from popping can be obtained by incorporating a specific compound even in gasoline with a high aromatic content, and has completed the present invention.

The present invention aims to provide a gasoline composition that is imbued with anti-smoldering effects for gasoline engine spark plugs.

Means for Solving the Problems The present invention provides a gasoline fraction with an aromatic content of 35% by volume or more and a 50% distillation temperature of 85 to 125°C, and an alkylated earth metal sulfonate of 0.01 to 1.0% by weight. % of gasoline is provided.

In the present invention, the gasoline fraction refers to a fractional distillation range of 35 to 2.
00℃ petroleum distillate, specifically JIS K
Examples include automobile gasoline specified in 2202. However, in the present invention, the aromatic content is 35% by volume or more, preferably 35 to 60% by volume, and the 50% distillation temperature is 85 to 125°C.

The aromatic content here is based on JIS K 253.
The fuel oil hydrocarbon component test method (fluorescent indicator adsorption method) and the 50% distillation temperature in No. 6 were measured in accordance with the fuel oil distillation test method of JIS K2254.

On the other hand, the alkylated earth metal sulfonate referred to in the present invention is
It refers to an alkylar earth metal salt of an alkyl aromatic sulfonic acid having a molecular weight of about 100 to 700, and specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acids and synthetic sulfonic acids. The petroleum sulfonic acid referred to herein is one obtained by sulfonating the alkyl aromatic group of the lubricating oil fraction of mineral oil. Synthetic sulfonic acids include, for example, sulfonated alkylbenzenes having linear or branched alkyl groups, which are produced as by-products from detergent manufacturing plants or obtained by alkylating polyolefins to benzene, or dinonylnaphthalenes. Examples include sulfonated furkylnaphthalenes such as.

On the other hand, examples of alkylated earth metals include magnesium, calcium, and barium.

The alkylated earth metal sulfonates of the present invention include not only neutral S<normal salts but also basic sulfonates obtained by heating the sulfonate and excess alkylated earth metal in the presence of water, and carbonic acid. Also included are so-called superbasic sulfonates, which are obtained by reacting sulfonates with alkylar earth metal oxides or hydroxides in the presence of gas.

The amount of alkylar earth metal sulfonate added is from 0.01 to 1.0% by weight, preferably from 0.05 to 0.5% by weight, based on the aforementioned gasoline fraction. If the amount of alkylated earth metal sulfonate added is less than 0.01% by weight, the effect of preventing smoldering of the spark plug will not be sufficient, while if the amount added exceeds 1.0% by weight, the amount added will increase. This is economically disadvantageous because a commensurate smoldering prevention effect cannot be obtained, and it is also undesirable because deposits in the engine combustion chamber increase.

The method for preparing the alkylated earth metal sulfonate and the gasoline fraction is arbitrary, and the gasoline composition of the present invention is prepared by adding a predetermined amount of the alkylated earth metal sulfonate to the gasoline fraction. You may refuel. Alternatively, the gasoline composition of the present invention can be prepared by adding a predetermined amount of an alkylated earth metal sulfonate to a gasoline tank of an automobile that is filled with gasoline fraction.

Furthermore, known fuel oil additives such as antioxidants, metal deactivators, surfactants, fuel auxiliaries, antistatic agents, and colorants are added to the gasoline composition obtained in the present invention, if necessary. You may. For more information on these additives, please visit
For example, they are described in ``Petroleum Product Additives'' (Saiwai Shobo), edited by Toshio Sakurai.

Furthermore, in order to improve the octane number, the gasoline composition of the present invention may further contain ethers such as methyl-[-butyl ether and isopropyl-[-butyl ether] and alcohols such as methanol, ethanol, and isopropyl alcohol. The blending amount of these ethers and alcohols is arbitrary, but generally gasoline compositions contain 10%
1 to 60 parts by weight, usually 1 to 25 parts by weight
Parts by weight.

Effects of the Invention The gasoline composition of the present invention is extremely effective in preventing spark plugs from smoldering, even though the gasoline composition has a high aromatic content and a high degree of heaviness, which tends to cause spark plugs to smolder.

Today, as a method to increase the octane number of gasoline without adding an alkyl anti-knock agent, in addition to the method of using an anti-knock agent other than an alkyl anti-knock agent, it is possible to change the hydrocarbon composition of gasoline itself, such as aroma There is a method of increasing the group content to obtain a high octane number gasoline with an octane number of 96 or more, preferably 98 or more. The gasoline composition of the present invention has such a high aromatic content,
It can also be preferably applied to unleaded high octane gasoline with an octane number of 96 or higher, preferably 98 or higher.

Examples Example 1 and Comparative Example 1 Ultrabasic calcium sulfonate (ultrabasic petroleum calcium sulfonate) was added to unleaded gasoline with an aromatic content of 50% by volume and a 50% distillation temperature of 106°C. A gasoline composition of the present invention was obtained.

Using a test vehicle with an exhaust of 11,300 cc equipped with a carburetor-type fuel supply system and a manual transmission, the following drivability evaluation test was conducted using the above gasoline composition as fuel, and the results are shown in Table 1. Indicated.

[Drivability Evaluation Test] A new spark plug specified by the manufacturer was installed in the test vehicle at 9:00 a.m. when the test started. The test vehicle was moved using a chassis dynamometer under room temperature conditions of 0°C, and the acceleration/deceleration mode was repeated three times for each pattern for 2 minutes, and then stopped for 54 minutes. Repeat the test with this as one cycle, and use the number of cycles when poor acceleration occurs as a guideline for evaluation.If poor acceleration occurs, stop operation and visually check the condition of the spark plug at that time. I observed it. In addition, in the case where the operation could be continued until the 12th cycle, the operation was stopped after the 12th cycle, and the state of the spark plug at that point was visually observed.

For comparison, a similar drivability evaluation test was also conducted without adding ultrabasic calcium sulfonate, and the results are also shown in Table 1.

An alkylated earth metal sulfonate was added to unleaded gasoline whose properties are not shown in Table 1 to obtain a gasoline composition of the present invention.

Using this gasoline composition as fuel, a driving performance evaluation test similar to that in Example 1 was conducted using the test vehicle shown in Table 1, and the results are also shown in Table 1.

For comparison, the same driving performance evaluation test as in Example 1 was also conducted in the case where no alkylated earth metal sulfonate was added.As is clear from the results of the driving performance evaluation test in Table 1, All of the gasoline compositions of Examples to which metal sulfonates were added had excellent smoldering prevention effects and were able to continue operating beyond the 12th cycle. On the other hand, all comparative gasolines without any alkylated earth metal sulfonates added 1
By the second cycle, there was poor acceleration, and a noticeable smoldering phenomenon was observed in the spark plug.

Claims (1)

[Scope of Claims] [1] Aromatic content 35% by volume or more and 50% distillation temperature 8
A gasoline composition comprising 0.01 to 10% by weight of an alkylated earth metal sulfonate based on a gasoline fraction having a temperature of 5 to 125°C.