A long-storage special flamethrowing fuel and its preparation method

Abstract

This invention discloses a long-storage special flammable fuel and its preparation method, belonging to the field of special oil processing and production technology. The flammable fuel of this invention is prepared by the following method: a special oil is added to a reaction vessel, then a coagulating powder is added and stirred evenly; xylenol is added and stirred evenly; the reaction vessel is sealed and pressurized with nitrogen; after the reaction vessel is pressurized to a certain pressure, stirring is stopped and the mixture is allowed to stand; after standing, the flammable fuel is obtained. The special oil of this invention has a fixed composition and low impurity content, and using it as a solvent oil to prepare the flammable fuel greatly improves the storage stability of the flammable fuel. Simultaneously, the nitrogen pressurization step of this invention helps to homogenize the sample and facilitate long-term storage. This invention not only realizes the large-scale preparation of special flammable fuels with a simple and safe production process, but also produces special flammable fuels with stable performance, long-term storage capability, and convenient long-distance transportation, large-scale supply, and standardized use.

Description

Technical Field

[0001] This invention belongs to the field of special oil processing and production technology, specifically relating to a long-storage special flamethrowing fuel and its preparation method. Background Technology

[0002] Flame fuel is a crucial component of flamethrowers. Modern flamethrower fuels are mostly thickened oils, a viscoelastic, flowing colloid. Compared to unthickened fuels, they offer better combustion, are harder to extinguish, have a longer burn time, and are safer to use. Current flamethrower fuels are made by mixing ordinary automotive gasoline with a gelling agent in a specific ratio. The gasoline used can be 90, 92, or 93 octane unleaded gasoline, while the gelling agent converts the liquid gasoline into a colloidal fuel. The gelling agent, also known as a thickener, is primarily composed of aluminum alkylate compounds. A gelling accelerator is also added during fuel preparation. The prepared fuel typically requires a maturation period of 3-5 days to become thickened, but this can be shortened to a few hours under pressure.

[0003] For the current production and supply of flammable fuel, on the one hand, commercially available gasoline contains not only various aliphatic hydrocarbons (C4-C12), but also a large amount of olefins, aromatic hydrocarbons, cycloalkanes, and less than 5% ether compounds. These components vary greatly depending on the source of crude oil, processing technology, and blending scheme, lacking a definite composition. Affected by factors such as complex raw material sources and drastic changes in external conditions during fuel blending, the prepared flammable fuel often has a low success rate and poor apparent viscosity stability. Generally, after one month of blending and maturation, it gradually thins, separates into phases, and becomes unusable, greatly limiting the flammability. On the other hand, flammable fuel is always blended on-site, significantly increasing time and labor costs and affecting subsequent use. Therefore, it is necessary to develop a long-storage standardized flammable fuel and establish a corresponding large-scale production process to achieve large-scale, standardized supply of flammable fuel. Summary of the Invention

[0004] This invention provides a special solvent oil for flamethrowing fuel, which is composed of the following components by mass fraction: 4% n-hexane, 18% 2-methylhexane, 18% 3-methylhexane, 15% n-heptane, 5% methylcyclohexane, 15% 2-methylheptane, 5% 4-methylheptane, 15% 3-methylheptane, and 5% n-octane.

[0005] This invention provides the application of the above-mentioned special oil in improving the storage stability of flamethrower fuels.

[0006] This invention provides a method for preparing a flamethrower fuel, comprising the following steps:

[0007] Add the special oil to the reactor, then add the oil-gelling powder and stir evenly; add xylenol and stir evenly; seal the reactor and pressurize it with nitrogen; after the reactor is pressurized to a certain pressure, stop stirring and let it stand; after standing, the flame-throwing oil is obtained.

[0008] In the above preparation method, the mass ratio of the special oil, the gelling oil powder and the xylenol is selected from 10 to 20:2:1; the mass ratio can be further preferred to be 10:2:1, 12.5:2:1 or 20:2:1.

[0009] In the above preparation method, the oil powder is aluminum diisooctanoate.

[0010] In the above preparation method, the pressure is 0.4 to 1.5 MPa, preferably 1 MPa.

[0011] In the above preparation method, the standing time is not less than 24 hours.

[0012] The present invention provides a flamethrower prepared by the above method.

[0013] The beneficial effects of this invention are as follows:

[0014] Compared to traditional solvent oils used in flamethrower fuels (such as automotive gasoline), the specially formulated oil of this invention has a fixed composition and lower impurity content. Using it as a solvent oil in the preparation of flamethrower fuels significantly improves the storage stability of the fuels. Furthermore, this invention employs mechanical stirring during the preparation process, allowing for precise control of the stirring process and conditions. In addition, a stamping step is included, which aids in sample homogenization and long-term storage. This invention enables the large-scale preparation of special flamethrower fuels with a simple and safe production process. The prepared special flamethrower fuel exhibits stable performance and can be stored for extended periods (greater than 550 days), facilitating long-distance transportation, large-scale supply, and standardized use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the crude oil feeding operation;

[0016] Figure 2 Schematic diagram of the oil-coated powder feeding operation;

[0017] Figure 3 Schematic diagram of xylenol feeding operation;

[0018] Figure 4 Schematic diagram of pressurizing the reactor;

[0019] Figure 5 This is a schematic diagram of the material discharge from the reactor;

[0020] Figure 6 The room temperature storage conditions of the flamethrower fuel;

[0021] Figure 7 The viscosity of the flammable fuel gel prepared in each embodiment changes over time;

[0022] Figure 8 The viscosity of the flaming oil gel prepared for each comparative example changes over time. Detailed Implementation

[0023] The raw materials and equipment used in this invention are as follows:

[0024] Oil-based powder (aluminum diisooctanoate, Qinhuangdao Changbai Hanfeng Technology Co., Ltd.), xylenol (Qinhuangdao Changbai Hanfeng Technology Co., Ltd.), reaction vessel (1m 3 It is made of stainless steel, with an anchor-type stirring paddle, an explosion-proof motor, a vacuum feeding system (made of plastic, operating pressure 0.4~1.5Mpa), and a discharge pipeline system (made of plastic).

[0025] In this invention, the special oil is a C4-C8 component solvent oil with a fixed composition and free of other impurities. Its composition and the mass fraction of each component are as follows: n-hexane 4%, 2-methylhexane 18%, 3-methylhexane 18%, n-heptane 15%, methylcyclohexane 5%, 2-methylheptane 15%, 4-methylheptane 5%, 3-methylheptane 15%, and n-octane 5%.

[0026] In this invention, the reactor can be cleaned before use. The steps are as follows: first, soak and stir with xylenol overnight, then heat with steam for further cleaning. After the reactor temperature cools down, workers perform internal detailed cleaning to remove contaminants.

[0027] In this invention, the formula for calculating the yield of the flamethrower fuel is as follows:

[0028] Yield = (Mass of oleogel produced / Total mass of feed) × 100%

[0029] Other materials used in this invention, unless otherwise stated, are commercially available. Other terms used in this invention, unless otherwise specified, generally have the meanings commonly understood by those skilled in the art. The invention is further described in detail below with reference to specific embodiments and data. The following embodiments are merely illustrative and not intended to limit the scope of the invention in any way.

[0030] Example 1

[0031] The preparation process for high-temperature flamethrower fuel includes the following steps:

[0032] In a dry and clean reactor, 500 kg of special oil is added using a vacuum suction method. Figure 1As shown. Start stirring at 500 rpm. Take a clean and dry plastic bucket, weigh 100 kg of oil coagulant powder (20% of the mass of the special oil), as Figure 2 shown in a. Add the oil coagulant powder to the reaction kettle at one time, and continue stirring for 30 min, as Figure 2 shown in b, to make it evenly dispersed in the system. Take a clean and dry plastic bucket, weigh 50 kg of xylenol (the mass ratio of oil coagulant powder to xylenol is 2:1), as Figure 3 shown in a. Add the xylenol to the reaction kettle, as Figure 3 shown in b, and stir for 60 min. Then seal the reaction kettle and press it with nitrogen to 1 MPa, as Figure 4 shown. After the reaction kettle is pressurized to 1 MPa, immediately stop stirring and let it stand still for 24 h. After standing still, 630.5 kg of high-temperature type flamethrower fuel oil is obtained.

[0033] The yield of the high-temperature type flamethrower fuel oil is 97%.

[0034] The total mass of the added materials = 500 kg (special oil) + 100 kg (oil coagulant powder) + 50 kg (xylenol) = 650 kg. According to the above yield calculation formula, therefore, the yield of the high-temperature type flamethrower fuel oil is 630.5 kg / 650 kg × 100% = 97%.

[0035] After obtaining the high-temperature type flamethrower fuel oil, discharge the material from the reaction kettle. The external hose of the discharging system is used for bagged material receiving, as Figure 5 shown in a. Connect two hoses for 10 L packaging bag material receiving, and the remaining flamethrower fuel oil is filled in gasoline barrels, as Figure 5 shown in b.

[0036] Detect the viscosity of the high-temperature type flamethrower fuel oil: Take the product into a 1000 mL screw-thread bottle, record the ambient temperature, and test the apparent viscosity. The test temperature is 25 °C, and the viscosity is 800 - 1000 Pa·s, which is qualified.

[0037] Example 2

[0038] The preparation process of the low-temperature type flamethrower fuel oil is as follows:

[0039] In a dry and clean reactor, 500 kg of special oil was added using a vacuum suction method. Stirring was started at 500 rpm. 50 kg of oil-gelling powder (10% of the special oil's mass) was weighed from a clean, dry plastic container. The oil-gelling powder was added to the reactor all at once, and stirring continued for 30 minutes to ensure uniform dispersion. 25 kg of xylenol (oil-gelling powder to xylenol mass ratio 2:1) was weighed from a clean, dry plastic container. The xylenol was added to the reactor, and stirring was continued for 30 minutes. The reactor was then sealed, and pressurized with nitrogen to 1 MPa. Once the reactor was pressurized to 1 MPa, stirring was immediately stopped, and the mixture was allowed to stand for 24 hours. After standing, 552.2 kg of low-temperature flamethrower oil was obtained.

[0040] The yield of low-temperature flamethrower fuel is 96%.

[0041] After obtaining the low-temperature flammable fuel, the reaction vessel is discharged as described in Example 1.

[0042] The viscosity of the low-temperature flamethrower was tested as follows: The product was poured into a 1000mL threaded bottle, the ambient temperature was recorded, and the apparent viscosity was tested. At a test temperature of 25℃, the viscosity was 200–300 Pa·s, which is considered acceptable.

[0043] Example 3

[0044] The preparation process for room-temperature type flamethrower fuel is as follows:

[0045] 500 kg of special oil was added to a dry and clean reactor using a vacuum suction method. Stirring was started at 500 rpm. 80 kg of coagulated oil powder (16% of the special oil's mass) was weighed from a clean, dry plastic container. The coagulated oil powder was added to the reactor all at once, and stirring continued for 30 minutes to ensure uniform dispersion. 40 kg of xylenol (coagulated oil powder to xylenol mass ratio 2:1) was weighed from a clean, dry plastic container. The xylenol was added to the reactor, and stirring was continued for 30 minutes. The reactor was then sealed and pressurized with nitrogen to 1 MPa. Once the reactor was pressurized to 1 MPa, stirring was immediately stopped, and the mixture was allowed to stand for 24 hours. After standing, 603.3 kg of room-temperature flamethrower oil was obtained.

[0046] The yield of room-temperature flamethrower fuel was 97.3%.

[0047] After obtaining the room-temperature flamethrower fuel, the reaction vessel is discharged as described in Example 1.

[0048] The viscosity of the room-temperature flamethrower was tested as follows: A sample was poured into a 1000mL threaded bottle, the ambient temperature was recorded, and the apparent viscosity was measured. At 25℃, the viscosity was 400–500 Pa·s, which is considered acceptable.

[0049] Comparative Example 1

[0050] Traditional flamethrower fuel process:

[0051] Currently, existing technologies all use automotive gasoline and standardized solidified fuel powder to temporarily prepare flare fuel. The gasoline source is complex, the composition is not fixed, and the impurity content is high, which means that the service life of flare fuel is often no more than one month. Moreover, due to factors such as large environmental interference during the preparation process and long fuel maturation period, existing flare fuels have prominent problems such as low preparation success rate and poor storage stability.

[0052] This comparative example provides a common on-site preparation process for flamethrower fuel, as detailed below:

[0053] Mix the gelling powder and xylenol at a mass ratio of 9:1 (18 kg gelling powder, 2 kg xylenol), then add automotive gasoline (Sinopec 92-octane automotive gasoline, Qingdao area), with a mass ratio of gelling powder / xylenol mixture to automotive gasoline of 20:80 (80 kg automotive gasoline); manually stir the mixture for 30 minutes to ensure uniform mixing; seal the mixed system and allow it to gel; the entire operation and product storage are carried out under normal temperature and humidity conditions.

[0054] Comparative Example 2

[0055] The steps for preparing the flamethrower are as follows:

[0056] Mix the gelling oil powder and xylenol at a mass ratio of 9:1 (18 kg gelling oil powder, 2 kg xylenol), then add the special oil, with a mass ratio of gelling oil powder / xylenol mixture to special oil of 20:80 (80 kg special oil); manually stir the mixture for 30 minutes to ensure uniform mixing; seal the mixed system and allow it to gel; the entire process and product storage are carried out under normal temperature and humidity conditions.

[0057] I. Storage Test

[0058] Long-term room temperature storage tests were conducted on the flamethrower fuels described in the examples and comparative examples.

[0059] The test results are as follows Figures 6-8 As shown:

[0060] Figure 6 The study demonstrates the storage conditions of flamethrower fuel at room temperature; Figure a shows the flamethrower fuel described in Example 1 after one year of storage at room temperature, and Figure b shows the flamethrower fuel described in Comparative Example 1 after one month of storage at room temperature.

[0061] Depend on Figure 6 It can be seen that after one year of storage, the flammable oil prepared by this invention maintains good viscosity, such as... Figure 6As shown in a. However, the traditionally prepared flamethrower loses its gel properties and becomes a free-flowing fluid after one month of storage, such as... Figure 6 As shown in b.

[0062] Figure 7 The viscosity of the flaming oil gel described in Examples 1-3 is shown as a function of time.

[0063] Depend on Figure 7 It can be seen that the flamethrower oil prepared using the preparation process of the present invention, after being sealed and stored at room temperature for 550 days, has a viscosity decrease of less than 15%, indicating that the flamethrower oil prepared by the present invention has significant long-term storage stability.

[0064] Figure 8 The viscosity of the flamethrower gel described in Comparative Examples 1 and 2 as a function of time is shown.

[0065] Depend on Figure 8 It is evident that after replacing automotive gasoline with specialized oil, even when using traditional on-site preparation processes for flamethrower fuel, the long-term storage stability of the prepared fuel is significantly improved. This indicates that solvent oil with a fixed composition and free of other impurities has a crucial impact on the storage stability of flamethrower fuel.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. The application of a special oil in improving the storage stability of flare oil, characterized in that, The special oil is composed of the following components by mass fraction: n-hexane 4%, 2-methylhexane 18%, 3-methylhexane 18%, n-heptane 15%, methylcyclohexane 5%, 2-methylheptane 15%, 4-methylheptane 5%, 3-methylheptane 15%, and n-octane 5%; The preparation method of the flamethrower oil includes the following steps: The special oil is added to the reaction vessel, followed by the addition of oil-gelling powder and stirred until homogeneous. Xylenol is added and stirred until homogeneous. The reaction vessel is then sealed and pressurized with nitrogen. Once the reaction vessel has been pressurized to a certain pressure, stirring is stopped and the mixture is allowed to stand. After standing, the flamethrower oil is obtained. The mass ratio of the special oil, gelling oil powder, and xylenol is selected from 10 to 20:2:

1.

2. The application according to claim 1, characterized in that, The mass ratio of the special oil, gelling oil powder, and xylenol is 10:2:1, 12.5:2:1, or 20:2:

1.

3. The application according to claim 1, characterized in that, The oil-coating powder is aluminum diisooctanoate.

4. The application according to claim 1, characterized in that, The pressure is 0.4~1.5MPa.

5. The application according to claim 4, characterized in that, The pressure is 1 MPa.

6. The application according to claim 1, characterized in that, The settling time shall not be less than 24 hours.

Images