JPS6357692A - Fuel oil additive antioxidant composition - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an acid and antioxidant composition that is blended into fuels such as gasoline, kerosene, and jet fuel oil in a proportion of 5 to 1100 pp.

[Prior art]

Antioxidants are usually blended into fuels such as gasoline, kerosene, and jet fuel oil in a proportion of 5 to 1100 pp.

This antioxidant is added for the purpose of preventing unstable diolefins in the fuel from being oxidized and polymerized to form gum.

Gum is normally dissolved in fuels such as gasoline and jet fuel, but it also accumulates during storage and becomes deposits when the fuel evaporates in the engine, causing problems in the carburetor, intake manifold, It adheres to intake valves, etc. and interferes with their normal operation.

Therefore, in order to prevent the formation of gum, a phenolic compound with radical scavenging properties is blended to prevent polymerization by capturing peroxy radicals generated by the reaction between hydrocarbons such as diolefins and oxygen.

Such phenolic compounds include: ■ 2.6-di-t-butyl-4-methylphenol ■ 2.6-di-t-butylphenol ■ 4.4'-
Methylenebis(2,6-di-t-butylphenol) ■ 2.6-di-t-butylphenol (83-88 parts) and 2.4.6-di-t-butylphenol (17
~12 parts) (trade name: EthyIA Antioxidant 735, manufactured by Ethyl Corporation), etc. are approved by British Standard DERD 2494. - The effects of these antioxidants are shown by the oxygen absorption induction period (minutes) relative to the concentration of the antioxidant added, and the longer the period, the better the antioxidant effect. Table 1 shows the oxygen absorption induction period when 20 ppm and 40 ppm of each phenolic compound was added to gasoline.

The oxygen absorption induction period is measured according to ASTM-D-52.
5 (test temperature: 120°C).

Table 1 Note that the oxygen absorption induction period for gasoline when no antioxidant is added is 65 minutes.

[Disadvantages of conventional technology]

All of these antioxidants have a freezing point higher than 0° C., and when added to kerosene, gasoline, etc., they must be dissolved in a solvent such as toluene before being added, which is cumbersome.

In order to solve this problem, liquid products that are pre-dissolved in hydrocarbon solvents are commercially available, but these liquid antioxidants have diluted active ingredients, resulting in a decrease in the antioxidant effect and the risk of storage during the winter. There is a problem in that the oxidizing agent sometimes precipitates and blocks storage tank strainers, feed nozzles, etc., and there is a strong desire to develop a liquid antioxidant that does not precipitate crystals even at low temperatures and has excellent workability.

[Specific measures to solve the problem]

In the present invention, by mixing 2,6-di-t-butylphenol and 2,6-di-t-butyl-4-methylphenol, the freezing point
978), and further mixed with other alkylphenols at a specific ratio, from -3℃ to -13℃.
An object of the present invention is to provide an antioxidant composition that can maintain a liquid state even under conditions of .degree.

That is, the present invention provides component (A): 2,6-di-t-butyl-4-methylphenol.
5-45% by weight (B) component: 50-801m% 2.6-di-t-butylphenol
and an alkylphenol mixture R containing 50 to 20% by weight of an alkylphenol represented by the following formula.

[In the formula, R is hydrogen, R2-R4 is hydrogen or carbon number 4j
It is an alkyl group of iti8. ]The above (A) component and (B
The present invention provides a liquid fuel oil-added antioxidant composition characterized in that it contains the components () in the above proportions.

Component (A), a 2,6-di-t-butyl-4-methylfulphenol mixture, can be prepared manually from Mitsubishi Yuka Fine ■.

Component (B) is 2,6-di-t-butylphenol.
It is an alkylphenol mixture containing 0 to 80% by weight, and this mixture can be obtained as a middle distillate or a high boiling point fraction during distillation in the production process of 2,6-di-1-butylphenol (Unexamined Japanese Patent Publication No. Showa 60-2524
39).

Or by-products such as these middle distillates and high boiling point fractions,
It can also be obtained by mixing 2.6-di-t-butylphenol in a fixed ratio.

Therefore, the alkylphenols other than 2,6-di-t-butylphenol in component (B) that account for 20 to 50% by weight include ortho-t-butylphenol, 2.4-di-t-butylphenol,
di-t-butylphenol, 2.5-di-t-butylphenol, 2.4.6-tri-t-butylphenol,
2-t-butyl-6-octylphenol, 2-t-butyl-4-octylphenol, 2-t-butyl-6-
5ec-butylphenol, 2-t-butyl-4-5e
Examples include c-butylphenol.

Figure 1 shows a mixture of 2,6-di-t-butylphenol as component (A) and alkylphenol as component (B) (composition:
2,6-di-t-butylphenol 65% by weight, 2,4
-di-t-butylphenol 19% by weight, 2,5-di-
2% by weight of t-butylphenol, 2.4.6-trit
-Butylphenol (14% by weight) is shown in the figure below, showing the freezing point when mixed with various compositions. The component (A) is 5 to 45% by weight, and the solidifying point of the composition is in the range of -13°C to -13°C. Therefore, the fuel oil-added antioxidant composition of the present invention is easy to handle because it is liquid at room temperature (20° C.) under atmospheric pressure.

Example 1 2,6-di-t-butyl-4, component (A) in FIG.
- Table 2 shows the oxygen absorption induction period when 20 ppm and 40 ppm of a mixture of 30% by weight of methylphenol and 70% by weight of the alkylphenol mixture of component (B) (freezing point: 13°C) were added to gasoline and kerosene, respectively. The oxygen absorption induction period was measured according to ASTM-D~52.
The test temperature was 120℃ for gasoline.
, the temperature of kerosene is 150°C.

Table 2 By the way, 20ppm and 4% of 2,6-di-1-butyl-4-methylphenol dissolved in toluene were added to gasoline.
The oxygen absorption induction period when Qppm was added was 1
50 minutes, 170 minutes, and 100 minutes each for kerosene.
It was 130 minutes.

〔Effect of the invention〕

The fuel oil-added antioxidant composition of the present invention is liquid at room temperature under atmospheric pressure, so unlike conventional antioxidants that are solid at room temperature, it is necessary to dissolve it in a solvent such as toluene and add it to fuel oil. Instead, the composition can be added directly to the fuel oil.

[Brief explanation of drawings]

FIG. 1 is a correlation diagram between antioxidant composition and freezing point.

Claims (1)

[Claims] 1) Component (A): 2,6-di-t-butyl-4-methylphenol 5-4
5% by weight Component (B): 50-80% by weight of 2,6-di-t-butylphenol
and an alkylphenol mixture containing 50 to 20% by weight of alkylphenol represented by the following formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ 95 to 55% by weight [In the formula, R_1 is hydrogen, R_2 to R_4 are hydrogen or carbon number 4 ~8 alkyl group. ] A fuel oil-added antioxidant composition containing the above components (A) and (B) in the above proportions. 2) The composition according to claim 1, wherein the composition exhibits a liquid state at 20° C. under atmospheric pressure.