Aviation gasoline and preparation method thereof

Abstract

The invention relates to the field of fuel oil, and discloses aviation gasoline and a preparation method thereof. The preparation method of the aviation gasoline comprises the steps that alkylated gasoline is rectified, the alkylated gasoline with the distillation range of 35-125 DEG C is taken as a component A, the component A, a component B and an optional additive are mixed, and the weight ratio of the component A to the component B in the aviation gasoline is 2-9; the component B contains isopentane and cumene, and the weight ratio of the isopentane to the cumene is 0.5-2. The aviation gasoline provided by the invention meets various indexes such as octane number, vapor pressure, distillation range and the like, greatly reduces the use amount of tetraethyl lead, and is environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fuel oil, and particularly relates to an aviation gasoline and a preparation method thereof. BACKGROUND

[0002] Alkylation gasoline is a gasoline component produced by the reaction of isobutane in light hydrocarbon with butene, 2-butene, isobutene, etc., which has the characteristics of high octane number, good sensitivity, no aromatic hydrocarbon, sulfur and olefin, is an ideal high-octane clean gasoline component, and is often adjusted into motor gasoline by petrochemical enterprises to improve the overall octane number. In addition, it is also often used to blend aviation gasoline, which is the main blending component of aviation gasoline. Compared with motor gasoline, aviation piston engines have greater power and compression ratio, so higher demands are put forward for the antiknock performance of aviation gasoline, i.e., high octane number.

[0003] At present, the octane number of aviation gasoline can be improved by adding antiknock agent tetraethyl lead, but the lead-containing antiknock agent is highly toxic and can easily produce lead deposition in the engine to affect the performance of the engine. In addition, with the increasing emphasis on health, environmental protection and safety in the future and the larger-scale use of high-performance engines, it is an inevitable trend to reduce the use of lead or even avoid the use of lead. By controlling the composition of alkylation gasoline, the alkylation gasoline has a higher motor octane number (MON), a more suitable vapor pressure and a distillation range, and the preparation difficulty of ultra-low lead or lead-free aviation gasoline is reduced.

[0004] CN 115074161B discloses a composition of aviation gasoline and a preparation method thereof. The composition of the aviation gasoline is as follows: C4 alkane 4.35-6.5% by weight, C5 alkane 4.5-6% by weight, C6 alkane 3.5-5.5% by weight, C7 alkane 24-25.5% by weight, C8 alkane 50-60% by weight, C9 alkane 0.75-1.5% by weight, C10 alkane 2-3% by weight, and the content of the additive tetraethyl lead is 0.8-1.2 g / kg. However, the base oil used in this method contains three kinds of distillate oils, although the addition amount of tetraethyl lead is reduced to a certain extent, the production process is still relatively complicated.

[0005] CN 106590772B discloses a low-lead aviation gasoline. The composition of the low-lead aviation gasoline is as follows: 50-90% by weight of alkylation device oil produced by an alkylation device, 3-15% by weight of pentane component oil produced by a reforming device, 0-25% by weight of C7 aromatic component oil produced by an aromatic extraction device, 0-20% by weight of cumene, 5-15% by weight of C6 non-aromatic raffinate component oil produced by an aromatic extraction device, wherein the aviation gasoline contains 0.95-1.2 g / kg of tetraethyl lead, not more than 0.5% by weight of arylamine compounds and not more than 10 ppm of sulfur. However, the method uses many component oils for blending, and the amount of antiknock agent is still large, which increases the difficulty of preparing low-lead aviation gasoline.

[0006] In summary, the current domestic production of (low lead) aviation gasoline used to blend oil types more, the preparation process is relatively cumbersome, and the addition amount of anti-knock agent is still relatively high. SUMMARY

[0007] The purpose of the present application is to overcome the problems of high lead content and difficult preparation process in the prior art, and to provide an aviation gasoline and a preparation method thereof.

[0008] In order to achieve the above-mentioned purpose, the present application provides an aviation gasoline preparation method, which comprises: rectifying alkylate gasoline, taking the alkylate gasoline with a distillation range of 35-125℃ as component A, mixing component A, component B and optional additives, wherein the weight ratio of component A to component B in the aviation gasoline is 2-9; and the weight ratio of isopentane to cumene in component B is 0.5-2.

[0009] The second aspect of the present application provides an aviation gasoline prepared by the method as described above, wherein the aviation gasoline composition comprises component A, component B and optional additives, wherein the component A is alkylate gasoline with a distillation range of 35-125℃; the weight ratio of isopentane to cumene in component B is 0.5-2; and the weight ratio of component A to component B in the aviation gasoline is 2-9.

[0010] The present application uses a specific alkylate gasoline composition to prepare aviation gasoline with high octane number, suitable vapor pressure and distillation range, and can greatly reduce the content of tetraethyl lead, which can be as low as 0.25g / kg, and is more environmentally friendly. At the same time, the aviation gasoline preparation process of the present application is simple.

[0011] The aviation gasoline prepared by the aviation gasoline production method provided by the present application meets the standard GB1787-2018 of 100LL aviation gasoline. DETAILED DESCRIPTION

[0012] The specific embodiments of the present application are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0013] In a first aspect, the present application provides a preparation method of aviation gasoline, characterized in that the method comprises: rectifying alkylate gasoline, taking a component with a distillation range of 35-120℃ as alkylate component A, mixing component A, component B and optional additives, wherein the weight ratio of component A to component B in the aviation gasoline is 2-9; and the weight ratio of isopentane to cumene in component B is 0.5-2.

[0014] According to the present application, preferably, the alkylated gasoline contains 0-10 wt% of C4 hydrocarbons, 0-20 wt% of C5-C7 hydrocarbons, 65-75 wt% of C8 hydrocarbons, and 5-10 wt% of C9 and above hydrocarbons. More preferably, the alkylated gasoline contains 0-8 wt% of C4 hydrocarbons, 0-18 wt% of C5-C7 hydrocarbons, 66-73 wt% of C8 hydrocarbons, and 5-8 wt% of C9 and above hydrocarbons. More preferably, the content of isomeric alkanes in the alkylated gasoline is equal to or greater than 90 wt%, and further preferably 91-93 wt%. The distillation range of the alkylated gasoline can be 25-200°C, preferably 30-185°C. The alkylated gasoline contains substantially no aromatic hydrocarbon components.

[0015] According to the present application, preferably, the distillation conditions include a top temperature of 65-80°C, a bottom temperature of 110-120°C, and a distillation pressure of 80-120 kPa.

[0016] According to the present application, preferably, the distillation range of the component A is 40-120°C (e.g., 42-115°C, or 41.5-119.5°C). The component A obtained by using the above distillation conditions can satisfy the requirement of the octane rating of aviation gasoline while facilitating further reduction of the amount of added tetraethyl lead.

[0017] According to the present application, the weight ratio of the component A to the component B in the aviation gasoline is preferably 3-5. Controlling the weight ratio of the component A to the component B within the above range can further improve the overall performance of the aviation gasoline.

[0018] According to the present application, preferably, the weight ratio of the isopentane to the cumene is 0.8-1.5. Controlling the weight ratio of the isopentane to the cumene within the above range can further improve the vapor pressure of the aviation gasoline.

[0019] According to an embodiment of the present application, the additive contains tetraethyl lead. Preferably, the content of tetraethyl lead in the aviation gasoline is less than 0.4 g / kg, and further preferably, the content of tetraethyl lead in the aviation gasoline is equal to or less than 0.3 g / kg.

[0020] According to the present application, the content of the additive in the aviation gasoline can be 0.2-20 mg / kg, and the additive can be a gasoline additive commonly used in the art.

[0021] According to the present application, preferably, the additive further contains one or more of an antioxidant, an antistatic agent, an anticorrosive agent, and a dye.

[0022] According to the present application, preferably, the additive is an antioxidant, and preferably 2,6-di-tert-butyl-p-cresol.

[0023] According to the present invention, preferably, the amount of antioxidant used is no more than 12 mg / L relative to the total weight of the aviation gasoline composition. Using antioxidants within the above-mentioned range is beneficial for further improving the overall performance of the aviation gasoline.

[0024] Secondly, the present invention provides an aviation gasoline prepared by the method described above, wherein the aviation gasoline composition contains component A, component B and optional additives, wherein component A is an alkylated gasoline with a distillation range of 35-125°C; component B contains isopentane and cumene in a weight ratio of 0.5-2; and the weight ratio of component A to component B in the aviation gasoline is 2-9.

[0025] According to the present invention, the weight ratio of component A to component B and their respective types are preferably as described above, and will not be repeated here.

[0026] According to a preferred embodiment of the present invention, the aviation gasoline consists only of the above-mentioned components.

[0027] The present invention will be described in detail below through examples, but the present invention is not limited to the following examples. In the following examples and comparative examples, alkylated gasoline was obtained from China Petroleum & Chemical Corporation, and pure isooctane was purchased from Beijing Innocare Reagent Co., Ltd. The molecular composition of gasoline was analyzed by gas chromatography, and all parameters were analyzed according to the analytical methods specified in GB 1787-2018 "Fuels for Aviation Piston Engines".

[0028] Preparation Example 1

[0029] Alkylated gasoline (the molecular composition of alkylated gasoline is shown in Table 1, and its key physicochemical properties are shown in Table 2) was subjected to distillation. The bottom temperature of the distillation column was 115°C, and the top temperature was 70°C. The alkylated gasoline composition was extracted from the side stream of the distillation column, and its key physicochemical properties are shown in Table 3.

[0030] Table 1

[0031] hydrocarbon composition n-alkanes iso-alkanes olefins naphthenes aromatics total C4 6.46 0.29 0.01 0.00 0.00 6.76 C5 0.00 4.55 0.00 0.00 0.00 4.55 C6 0.00 5.13 0.00 0.00 0.00 5.13 C7 0.00 4.36 0.00 0.00 0.00 4.36 C8 0.00 70.70 0.01 0.00 0.00 70.71 C9 0.13 3.25 0.00 0.01 0.00 3.39 C10 0.06 1.24 0.00 0.01 0.00 1.31 C11 0.00 3.57 0.00 0.06 0.00 3.64 C12 0.00 0.15 0.00 0.00 0.00 0.15 total 6.65 92.93 0.02 0.08 0.00 100

[0032] Table 2

[0033]

[0034] Table 3

[0035]

[0036] Preparation Example 2

[0037] Alkylated gasoline (the molecular composition of alkylated gasoline is shown in Table 1, and its key physicochemical properties are shown in Table 2) was subjected to distillation. The bottom temperature of the distillation column was 125°C, and the top temperature was 45°C. The alkylated gasoline composition was extracted from the side stream of the distillation column, and its key physicochemical properties are shown in Table 4.

[0038] Table 4

[0039]

[0040] Preparation Example 3

[0041] Alkylated gasoline (the molecular composition of alkylated gasoline is shown in Table 1, and its key physicochemical properties are shown in Table 2) was subjected to distillation. The bottom temperature of the distillation column was 120°C, and the top temperature was 65°C. The alkylated gasoline composition was extracted from the side stream of the distillation column, and its key physicochemical properties are shown in Table 5.

[0042] Table 5

[0043]

[0044] Example 1

[0045] 80% by weight of a distillation-cut alkylated gasoline composition (prepared from Preparation Example 1) and 20% by weight of Composition B (50% by weight of isopentane and 50% by weight of cumene) were mixed, and 0.25 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a Motor Octane Number of 99.8. Other properties of this aviation gasoline are shown in Table 6 below.

[0046] Example 2

[0047] 80% by weight of a distillation-cut alkylated gasoline composition (prepared from Preparation Example 3) and 20% by weight of Composition B (50% by weight of isopentane and 50% by weight of cumene) were mixed, and 0.25 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a Motor Octane Number of 99.6. Other properties of this aviation gasoline are shown in Table 6 below.

[0048] Example 3

[0049] 70% by weight of a distillation-cut alkylated gasoline composition (prepared from Preparation Example 1) and 30% by weight of Composition B (50% by weight of isopentane and 50% by weight of cumene) were mixed, and 0.3 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a motor octane number of 100.1. Other properties of this aviation gasoline are shown in Table 6 below.

[0050] Example 4

[0051] 80% by weight of a distillation-cut alkylated gasoline composition (prepared from Preparation Example 1) and 20% by weight of Composition B (60% by weight of isopentane and 40% by weight of cumene) were mixed, and 0.25 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a Motor Octane Number of 99.7. Other properties of this aviation gasoline are shown in Table 6 below.

[0052] Comparative Example 1

[0053] 80% by weight of alkylated gasoline and 20% by weight of composition B (50% by weight of isopentane and 50% by weight of cumene) were mixed, and 1.06 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a motor octane number of 99.8. Other properties of this aviation gasoline are shown in Table 6.

[0054] Comparative Example 2

[0055] 80% by weight of a distillation-cut alkylated gasoline composition (prepared from Preparation Example 2) and 20% by weight of Composition B (50% by weight of isopentane and 50% by weight of cumene) were mixed, and 0.80 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a Motor Octane Number of 99.8. Other properties of this aviation gasoline are shown in Table 6.

[0056] Comparative Example 3

[0057] 80% by weight of pure isooctane and 20% by weight of composition B (60% by weight of isopentane and 40% by weight of cumene) were mixed, and 0.25 g / kg of tetraethyl lead and 12 mg / L of 2,6-di-tert-butyl-p-methylphenol (antioxidant) were added to prepare 100LL aviation gasoline with a motor octane number of 100.2. Other properties of this aviation gasoline are shown in Table 6 below.

[0058] Table 6

[0059]

[0060] As can be seen from the results of the above examples and comparative examples, when preparing aviation gasoline, by selecting only one alkylated gasoline composition with the distillation range and component content specified in this invention, and by adding a very small amount of tetraethyl lead (0.25 g / kg), aviation gasoline with a motor octane number, vapor pressure, and distillation range that meet the 100LL standard in GB 1787-2018 can be prepared.

[0061] Furthermore, the raw materials for this invention are widely available and can be obtained without high refining, and the energy consumption and cost are low. The method for preparing aviation gasoline is simple and easy to implement.

[0062] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing aviation gasoline, characterized in that, The method includes: distilling alkylated gasoline, taking alkylated gasoline with a distillation range of 35-125℃ as component A, mixing component A, component B and optional additives, wherein the weight ratio of component A to component B in the aviation gasoline is 2-9; and component B contains isopentane and isopropylbenzene in a weight ratio of 0.5-2.

2. The method for using aviation gasoline according to claim 1, wherein, The alkylated gasoline contains 0-10% by weight of C4 hydrocarbons, 0-20% by weight of C5-C7 hydrocarbons, 65-75% by weight of C8 hydrocarbons, and 5-10% by weight of C9 and above hydrocarbons.

3. The method for using aviation gasoline according to claim 1, wherein, The distillation conditions include: a top temperature of 65-80℃, a bottom temperature of 110-120℃, and a distillation pressure of 80-120 kPa.

4. The method for using aviation gasoline according to claim 1, wherein, The distillation range of component A is 40-120℃.

5. The method for using aviation gasoline according to claim 1, wherein, The weight ratio of component A to component B in the aviation gasoline is 3-5.

6. The method for using aviation gasoline according to claim 1, wherein, The weight ratio of isopentane to cumene in component B is 0.8-1.

5.

7. The method for using aviation gasoline according to claim 1, wherein, The additive contains tetraethyl lead, and the content of tetraethyl lead in the aviation gasoline is less than 0.4 g / kg; Preferably, the content of tetraethyl lead in the aviation gasoline is less than or equal to 0.3 g / kg.

8. The method for using aviation gasoline according to claim 1, wherein, The additive also contains one or more of antioxidants, antistatic agents, corrosion inhibitors, and dyes.

9. The method for using aviation gasoline according to claim 1, wherein, The additive is an antioxidant, preferably 2,6-di-tert-butyl-p-methylphenol.

10. The method for using aviation gasoline according to claim 1, wherein, The antioxidant content is no more than 12 mg / L relative to the total weight of the aviation gasoline composition.

11. An aviation gasoline, characterized in that, The aviation gasoline contains component A, component B, and optional additives, wherein component A is alkylated gasoline with a distillation range of 35-125°C; component B contains isopentane and isopropylbenzene in a weight ratio of 0.5-2; and the weight ratio of component A to component B in the aviation gasoline is 2-9.

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