JPS603439B2 - Production method of altered oil for combustion test - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a modified oil for combustion tests, which is obtained by modifying oil, particularly fuel oil such as kerosene, gasoline for automobiles, and aircraft fuel, through an oxidation reaction.

In order to investigate the combustion characteristics and lifespan of combustion equipment that uses this type of oil as fuel, degraded fuel oil is sometimes burned and evaluated as an accelerated test.

The altered oil used here has traditionally been created by heating, blowing air, irradiating with ultraviolet light, or exposing the oil to an environment that degrades it.

However, all of these methods take a long time, from two weeks to more than a year, to obtain altered oil.
There were drawbacks such as poor reproducibility and inability to obtain a desired degree of alteration. To explain in more detail about kerosene, which is a fuel oil, the following methods were typical for obtaining altered oil for testing.

'1) Heat to 18,000 or more and blow air into it.

'21 Irradiate ultraviolet rays and blow in air. Please leave it outdoors. According to the method of [1} and ■, the strong acid value (0
．． 1 or more) is obtained, so the acid value is 0.01 to 0.
It is diluted and used as a sample in order to make 03 normal degraded kerosene.

Method 3 involves changing the location of kerosene and the number of days of exposure. In the case of these methods, it takes a long time to alter the quality, and the degree of alteration differs each time it is produced, so reproducibility is poor and it is not possible to obtain a product with a desired degree of alteration.

Therefore, it is extremely inconvenient for evaluating various performances of combustion equipment. The present invention eliminates the above-mentioned conventional disadvantages and provides a method for producing products with any degree of deterioration in a short time and with good reproducibility.

As detailed below, the present invention is based on the results of elucidating the generation mechanism of denatured oil, including analysis of denatured oil. A modified oil is obtained by reacting the

The present inventors investigated the generation mechanism of altered oil and found that it goes through the following process: generation of peroxides → generation of brewing components → generation of resinous substances. Table 1 shows examples of the results of measuring the peroxide value, acid value, and resin content of normal commercially available kerosene and altered kerosene of various histories recovered from the market. Table 1 As is clear from Table 1, the peroxide value, acid value, and resin content of altered kerosene are higher than that of commercially available normal kerosene, and these values vary depending on the history. Recognize.

From the above facts, it is considered that in order to obtain degraded kerosene, it is sufficient to add each of the above-mentioned degraded components without irradiating with ultraviolet rays, applying heat, or blowing oxygen under natural conditions.

However, since each component is not fully understood and common peroxides are unstable, it is difficult to obtain the desired altered kerosene simply by adding degraded components. The present inventors believe that since oil deterioration goes through the process of peroxide production → brewing component production → resinous production as described above, by adding peroxide to oil and causing a reaction, It was also possible to generate acid components and resinous substances, and succeeded in obtaining denatured oil equivalent to that which had actually denatured.

In order to obtain denatured oil by this method, the following points must be noted. [1] The decomposition products of the peroxide used must be similar to the components contained in oil.

'2) Once the oil has been decomposed relatively quickly and has become the desired altered oil, do not allow the oil to deteriorate any further.

Hard To dissolve in oil.

etc.

The features of this method are as follows.

{1} To degrade oil by adding only peroxide,
The peroxide only serves as an initiator, and other deterioration reactions occur in a manner similar to natural deterioration. ■ Short time for deterioration.

Glue Excellent reproducibility as it is made by adding chemicals.

■ Any altered oil can be obtained by selecting the type and concentration of peroxide.

In addition, after adding peroxide, heating, irradiating with ultraviolet rays, or blowing oxygen can "further facilitate the deterioration of the oil.

Representative examples of peroxides used in the present invention are listed below.

Gun Hyde. Peroxides cumene hydro/gu oxide, t-butyl hydro/gu oxide, [b
} Dialkyl peroxides di-t-butyl/gu oxide, t-butylcumyl/
Gu oxide, {C) Diacyl peroxides launoyl/gu oxide, 3,5,5-trimethylhexanoyl peroxide, 'd} Peroxyesters t-butyl'gu oxyacetate, t-butyl nogu oxy Laurate, t-butyl/guoxy-3151
5-trimethylhexanoate Examples of the present invention will be described below.

Table 2 compares the peroxide values after adding 1% by weight of various peroxides to commercially available normal kerosene and reacting at 8000 for 4 hours.

As is clear from the results in Table 2, kerosene deteriorates when any type of peroxide is used.

However, the degree of alteration varies greatly depending on the type of peroxide. That is, when hydroperoxides and dialkyl peroxides are used, the amount of acidic components produced is low, and when dialcyl peroxides are used, relatively large amounts of acidic components are produced. When peroxyesters are used, the three deteriorating components are relatively large. Next, the results of investigating the effects of heating, ultraviolet irradiation, and oxygen blowing after adding peroxide will be explained.

As peroxides, lau/il peroxide and 3
- 515-trimethylhexanoyl peroxide music was used.

The analysis results of the obtained altered kerosene are shown in Table 3. In the table, U
V indicates ultraviolet irradiation, and 02 indicates oxygen blowing. From Table 3, it can be seen that the degree of oil deterioration progresses as the amount of peroxide added increases, the heating temperature increases, the more ultraviolet rays are irradiated, and the more oxygen is blown into the oil.

The analysis results in Tables 2 and 3 remained unchanged even after being left at room temperature for 3 months.

Next, we compared the characteristics of kerosene altered by conventional ultraviolet irradiation and oxygen injection and kerosene altered by the present invention using actual combustion equipment, and found that kerosene with corresponding altered components had similar characteristics. Furthermore, no difference was observed in gas chromatography, distillation tests, etc.

Therefore, it can be said that the material altered by the method of the present invention has almost the same altered state as that obtained by the conventional method. In the above embodiments, kerosene was explained, but the present invention can be similarly applied to fuel oils such as automobile gasoline and aircraft fuel.

Claims (1)

[Claims] 1. A fuel oil is oxidized by adding an organic peroxide selected from the group consisting of hydroperoxides, dialkyl peroxides, diacyl peroxides, and peroxy esters to fuel oil. A method for producing altered oil for combustion tests. 2. The method for producing denatured oil for combustion testing according to claim 1, wherein the oxidation reaction is carried out under the conditions of heat, light, oxygen, or a combination of two or more.