CN111607439A - Heat stability additive for aviation kerosene fuel - Google Patents
Heat stability additive for aviation kerosene fuel Download PDFInfo
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- CN111607439A CN111607439A CN202010573228.5A CN202010573228A CN111607439A CN 111607439 A CN111607439 A CN 111607439A CN 202010573228 A CN202010573228 A CN 202010573228A CN 111607439 A CN111607439 A CN 111607439A
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- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
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- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/18—Use of additives to fuels or fires for particular purposes use of detergents or dispersants for purposes not provided for in groups C10L10/02 - C10L10/16
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- C10L1/22—Organic compounds containing nitrogen
- C10L1/222—Organic compounds containing nitrogen containing at least one carbon-to-nitrogen single bond
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- C10L1/26—Organic compounds containing phosphorus
- C10L1/2633—Organic compounds containing phosphorus phosphorus bond to oxygen (no P. C. bond)
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- C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
- C10L2230/08—Inhibitors
- C10L2230/081—Anti-oxidants
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Abstract
The invention discloses a heat stability additive of aviation kerosene fuel, which comprises 20-75 wt% of solvent, 5-40 wt% of antioxidant, 15-60 wt% of detergent and 0.25-10 wt% of metal deactivator. The thermal stability additive can greatly improve the oxidation resistance stability of the aviation kerosene fuel, has very good compatibility with the aviation kerosene fuel, and can effectively inhibit the generation of fuel system sediments.
Description
Technical Field
The invention belongs to the field of oxidation-resistant heat stability of aviation kerosene fuels, and particularly relates to a heat stability additive of an aviation kerosene fuel.
Background
Aviation kerosene, a liquid fuel used in jet engines, is widely used in military and civilian aircraft. The thermal oxidation stability of jet fuel has a significant impact on aircraft engines and fuel systems. With the development of the aerospace field, the rated power of a modern aircraft engine is obviously higher than that of an original aircraft engine, and the working temperature of the whole engine system is obviously improved.
The aviation kerosene fuel decomposes at high temperature to generate colloid and further form insoluble precipitates such as paint films, carbon deposits and the like, which can cause a series of faults of a fuel system and have a plurality of influences on the safe driving of the airplane: (1) the oxidation deposits can block the oil filter element, the heat exchange efficiency is reduced, the lubricating oil and the cooling liquid are difficult to dissipate heat, and even the quality is deteriorated at high temperature; (2) self-adjustment of the oil pump is influenced, and adverse effects are generated on the work of the engine; (3) the fuel nozzle spray is deteriorated and unevenly distributed, which causes unstable hot start and even failed start of the engine, and may cause the pipeline pressure of the fuel system to increase.
In order to meet the performance requirements of aircraft engines and ensure safe flight of aircraft, the aviation kerosene fuel must have good thermal oxidation stability. Therefore, the addition of the thermal oxidation stability additive into the aviation kerosene fuel has very important significance, and the performance of the thermal oxidation stability additive is closely related to the stability of fuel quality, the reliable working life of an engine and the flight safety.
Disclosure of Invention
The invention provides a thermal stability additive of aviation kerosene fuel, which aims to solve the problems in the application of the existing aviation kerosene fuel and effectively inhibit the generation of fuel system sediments. The specific technical scheme is as follows:
the additive for thermal stability of aviation kerosene fuel consists of solvent, antioxidant, detergent and metal deactivator.
Preferably, the solvent is a diethylbenzene solvent, and the solvent accounts for 20-75 wt% of the heat stability additive, preferably 30-55 wt%.
Preferably, the antioxidant is a mixture of 2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetrakis (2, 4-di-tert-butylphenyl-4, 4' -biphenyl) bisphosphonate.
Preferably, in the antioxidant, the mass ratio of 2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetrakis (2, 4-di-tert-butylphenyl-4, 4' -biphenyl) bisphosphonate is 1 (0.1-1) to 1 (0.1-1). The antioxidant accounts for 5-40 wt%, preferably 10-25 wt% of the heat stability additive.
Preferably, the detergent is a mono-succinimide in a proportion of 15-60 wt%, preferably 25-50 wt%, in the heat stability additive.
Preferably, the metal deactivator is N, N' -bis (salicylidene) ethylenediamine, and accounts for 0.25-10 wt%, preferably 2-8 wt% of the heat stability additive.
Furthermore, the addition amount of the thermal stability additive in the aviation kerosene fuel is 20-2800 mg/L.
Preparation of thermal stability additive for aviation kerosene fuel:
weighing diethylbenzene, 2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol, tetrakis (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate, monobutyldiimide and N, N' -bis (salicylidene) ethylenediamine according to the proportion, firstly dissolving 2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol, tetrakis (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate, monobutyldiimide and N, N' -bis (salicylidene) ethylenediamine in diethylbenzene respectively to form solutions, then mixing the solutions, stirring uniformly at the temperature of 20-30 ℃ at the speed of 250-300rpm, the heat stability additive of the aviation kerosene fuel is obtained. In case that the deposition of the components affects the effect of the additive.
The effect of the additive of the invention is further explained:
when an airplane flies, the temperature of the aviation kerosene fuel is higher due to air friction, heat exchange between jet fuel and lubricating oil, combustion heat radiation and the like. For supersonic aircraft, fuel molecules are cracked when the fuel is at a high temperature, carbon deposit and coking are generated, and deposits are generated. If the thermal oxidation stability of jet fuel is not acceptable, the resulting gum blocks filters and nozzles, which can cause flight accidents. The additive for the thermal stability of the aviation kerosene fuel comprises the components of a solvent, an antioxidant, a detergent and a metal passivator, and the thermal stability of the aviation kerosene fuel is improved by utilizing the synergistic effect of the solvent, the antioxidant, the detergent and the metal passivator.
When two or more antioxidants are mixed for use, the antioxidant effect is usually greater than the sum of single use. This phenomenon is called synergy of antioxidants. When 2 hindered phenols with different steric hindrance, 2 amine antioxidants with different structures and activities, or 1 aromatic amine antioxidant and 1 hindered phenol antioxidant are compounded for use, a uniform synergistic effect can be generated, the high-activity antioxidant can effectively capture free radicals or peroxy radicals generated by oxidation, the low-activity antioxidant can provide hydrogen atoms, the high-activity antioxidant is regenerated, and a uniform synergistic effect is generated, so that the long-term antioxidant capacity is maintained. When the phenolic antioxidant and the phosphite antioxidant are compounded, an inhomogeneous synergistic effect exists, and the phenolic antioxidant cannot decompose hydroperoxide, so that when the phenolic antioxidant is used alone, an ideal anti-aging effect is difficult to achieve. Although the phosphite antioxidant does not have the capacity of capturing peroxide free radicals, the phosphite antioxidant can decompose hydroperoxide, so that the degradation caused by the autocatalytic reaction is inhibited, and the two antioxidants are used in a compounding way to achieve the complementation in action and can play a good synergistic effect. The four antioxidants are selected to mutually generate a certain synergistic effect, so that the antioxidant effect of the aviation kerosene fuel is better, and the antioxidant effect is better than that of one antioxidant which is singly used.
The heat stability additive for aviation kerosene fuel has the following effects:
the additive is stable and reliable, can be stored for more than one year, and greatly improves the heat stability of the aviation kerosene fuel on the original basis.
The additive has no corrosive action, has good applicability to aviation kerosene fuel and parts of a fuel system, and has no adverse effect.
The additive can improve the thermal stability of the aviation kerosene fuel, can effectively inhibit the generation of sediments in the combustion process, and can clean the sediments attached to a fuel pipeline.
Detailed Description
The following preparation methods were used in the following examples:
weighing diethylbenzene, 2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol, tetrakis (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate, monobutyldiimide and N, N' -bis (salicylidene) ethylenediamine according to the proportion, respectively dissolving 2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol, tetrakis (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate, monobutyldiimide and N, N' -bis (salicylidene) ethylenediamine in diethylbenzene, fully dissolving, putting the solutions into a reaction kettle, stirring at 20-30 ℃ at the speed of 250-300rpm for 2 hours, the heat stability additive of the aviation kerosene fuel is obtained.
Example 1:
according to weight percentage, stirring 40 percent of solvent diethylbenzene, 25 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate with the mass ratio of 1: 0.5: 1: 0.5), 30 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine at the speed of 300rpm at 20 ℃ for 2 hours, and fully and uniformly mixing.
Example 2:
according to weight percentage, 50 percent of solvent diethylbenzene, 15 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 0.5: 1: 0.5), 30 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 250rpm for 2 hours at 25 ℃ and fully and uniformly mixed.
Example 3:
according to weight percentage, 55 percent of solvent diethylbenzene, 10 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 0.5: 1: 0.5), 30 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 250rpm for 2 hours at 20 ℃ and fully and uniformly mixed.
Example 4:
according to weight percentage, 55 percent of solvent diethylbenzene, 10 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 0.8: 1: 0.8), 30 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 300rpm for 2 hours at the temperature of 28 ℃ and fully and uniformly mixed.
Example 5:
according to the weight percentage, 55 percent of solvent diethylbenzene, 10 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 1: 1: 1), 30 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 280rpm at the temperature of 22 ℃ for 2 hours and fully and uniformly mixed.
Example 6:
according to weight percentage, 50 percent of solvent diethylbenzene, 15 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 1: 1: 1), 30 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 260rpm at 27 ℃ for 2 hours and fully and uniformly mixed.
Example 7:
according to the weight percentage, 45 percent of solvent diethylbenzene, 15 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 1: 1: 1), 35 percent of detergent monobutyldiimide and 5 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 300rpm at 30 ℃ for 2 hours and fully and uniformly mixed.
Example 8:
according to the weight percentage, 45 percent of solvent diethylbenzene, 15 percent of antioxidant mixture (2, 6-di-tert-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetra (2, 4-di-tert-butylphenyl-4, 4 '-biphenyl) bisphosphonate four antioxidants with the mass ratio of 1: 1: 1: 1), 30 percent of detergent monobutyldiimide and 10 percent of metal deactivator N, N' -bis (salicylidene) ethylenediamine are stirred at the speed of 290rpm at the temperature of 20 ℃ for 2 hours and fully and uniformly mixed.
Testing of thermal stability additives for aviation kerosene fuels prepared in examples 1-8.
And (3) detection:
the ASTMD3241 standard of aviation kerosene fuel thermal oxidation stability determination method (JFTOT) is adopted for detection, and the concrete reference is made to table 1. A JFTOT oxidation stability tester is utilized to simulate the conditions of an aviation kerosene fuel system, and the color of the reaction of the sediment generated on the outer wall of the pipe and the pressure drop before and after the filter element are evaluated after the experiment to investigate the tendency of the high-temperature oxidation product of the aviation kerosene fuel and the heat oxidation stability of the reaction fuel.
Table 1: standard experimental conditions and judgment standards in aviation kerosene fuel specifications
Tianjin petrochemical No. 3 fuel oil is selected and No. 3 fuel oil is set as a blank control group. The Tianjin petrochemical No. 3 fuel oil and the heat stability additives prepared in the examples were tested, and the test data are shown in Table 2.
Table 2: data for the control group of fuel oils and the fuel oils with the additives for thermal stability of examples 1-8
As can be seen from the data in Table 2, the thermal oxidation stability index of the control group was not qualified at 315 deg.C, and the additive of the present invention reached the performance index. In the experiment, the tube rating and the filter membrane color show that the additive for the thermal stability of the aviation kerosene fuel can obviously inhibit the generation of sediments in the combustion process, the pressure drop shows that the additive can clean deposits attached to pipelines, and the index of the thermal oxidation stability meets the national standard.
The heat-stable additives prepared in examples 1 to 8 were stored in a sealed manner at room temperature, and after one year, performance index monitoring was carried out, and the same criteria as those in table 1 were used for detection.
And (3) detection:
tianjin petrochemical No. 3 fuel oil is selected and No. 3 fuel oil is set as a blank control group. The Tianjin petrochemical No. 3 fuel oil and the heat-stability additives prepared in each example were tested after storing for one year, and the test data are shown in Table 3.
Table 3: data from the fuel oil control and the fuel oil added with the thermal stability additives of examples 1-8 after one year storage
As can be seen from the data in tables 2 and 3, the performance of some examples remained the same after long-term storage, the performance of some examples slightly decreased, but remained within the acceptable range, and the additive of the present invention still achieved the performance index at 315 ℃. In the experiment, the tube rating and the filter membrane color show that the additive for the thermal stability of the aviation kerosene fuel can still obviously inhibit the generation of sediments in the combustion process after long-time storage; the pressure drop value indicates that the additive can still clean the pipeline attached sediment after long-time storage, and the index of thermal oxidation stability meets the national standard.
Claims (10)
1. The additive for the thermal stability of the aviation kerosene fuel is characterized by comprising the components of a solvent, an antioxidant, a detergent and a metal passivator.
2. The heat stability additive of claim 1, wherein the solvent is diethylbenzene, which is present in the heat stability additive in an amount of 20-75 wt%.
3. The heat stability additive according to claim 1, wherein the antioxidant is a mixture of 2, 6-di-t-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-butyl-p-aminophenol and tetrakis (2, 4-di-t-butylphenyl-4, 4' -biphenyl) bisphosphonate.
4. The heat stability additive according to claim 3, wherein the antioxidant comprises 2, 6-di-t-butyl-p-cresol, N-diisopropyl-p-phenylenediamine, N-N-butyl-p-aminophenol and tetrakis (2, 4-di-t-butylphenyl-4, 4' -biphenyl) bisphosphonate in a mass ratio of 1 (0.1-1) to 1 (0.1-1).
5. The heat stability additive of claim 1, wherein the antioxidant is present in the heat stability additive in an amount of 5 to 40 wt%.
6. The heat stability additive of claim 1, wherein the detergent is a monobutyldiimide.
7. The heat stability additive of claim 1, wherein the detergent is present in the heat stability additive in an amount of 15 to 60 wt%.
8. The thermal stability additive of claim 1, wherein the metal deactivator is N, N' -bis (salicylidene) ethylenediamine.
9. The heat stability additive of claim 1, wherein the metal deactivator is present in the heat stability additive in an amount of 0.25 to 10 wt%.
10. The thermal stability additive according to claim 1, which is added in an amount of 20 to 2800mg/L in an aviation kerosene fuel.
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