Coal-based aviation kerosene and a preparation method thereof

Abstract

The application discloses coal-based aviation kerosene and a preparation method thereof. The preparation method of the coal-based aviation kerosene comprises the following steps: (1) subjecting direct coal liquefaction oil to distillation cutting to obtain a light oil fraction; (2) subjecting the light oil fraction, methanol and hydrogen to alkylation reaction and hydrogenation reaction to obtain a reaction product; and subjecting the reaction product to distillation cutting to obtain the coal-based aviation kerosene. The method has the advantages that the light oil fraction of the direct coal liquefaction oil and the methanol are used as main raw materials, the raw materials are widely sourced and low in cost, the utilization rate of the direct coal liquefaction oil and the methanol is improved, the yield of the coal-based aviation kerosene is increased, the high-value utilization of the direct coal liquefaction oil and the methanol is realized, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of coal chemical industry, and more specifically, to a coal-based aviation kerosene and its preparation method. Background Technology

[0002] Liquid fuels are the power source for aircraft, and fuel energy determines flight performance. Conventional liquid fuels have low energy, which has become a problem restricting the performance of existing aircraft and the development of new aircraft. The energy of a fuel (energy = density * calorific value) depends on its molecular structure. Petroleum-refined fuels are mainly composed of chain and monocyclic structures with lower density and volumetric calorific value, while Fischer-Tropsch synthesis fuels have a higher content of chain structures.

[0003] Coal direct liquefaction oil is rich in polycyclic aromatic hydrocarbons (PAHs) and has a unique molecular structure, fully retaining the high-density polycyclic structure characteristic of coal. It is a high-quality raw material for producing high-density, high-heat-sinking, and high-heat-stability aviation kerosene. The production of aerospace fuel from coal direct liquefaction oil generally involves processes such as phenol removal, hydrogenation and impurity removal, hydrogenation saturation, and fractionation to obtain a mixture of cycloalkanes with a boiling range of 150–300℃. However, this route results in low aviation kerosene fraction yields, poor product performance, and its economic viability needs improvement. Summary of the Invention

[0004] This invention is based on the inventor's discovery and understanding of the following facts and problems: Currently, the production of aviation kerosene from direct coal liquefaction oil suffers from low yield, poor product performance, and economic efficiency needs to be improved.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a coal-based aviation kerosene and its preparation method, using light oil fractions from direct coal liquefaction oil and methanol as main raw materials. These raw materials are widely available and inexpensive, which helps to improve the utilization rate of direct coal liquefaction oil and methanol, increase the yield of coal-based aviation kerosene, and reduce production costs while achieving high-value utilization of direct coal liquefaction oil and methanol.

[0006] This invention provides a method for preparing coal-based aviation kerosene, comprising the following steps:

[0007] (1) Light oil fraction is obtained by distilling and cutting coal direct liquefaction oil;

[0008] (2) The light oil fraction, methanol and hydrogen are subjected to alkylation and hydrogenation reactions to obtain reaction products; the reaction products are distilled and cut to obtain coal-based aviation kerosene.

[0009] The advantages and technical effects of the coal-based aviation kerosene preparation method of this invention are as follows: Coal-based aviation kerosene is obtained by simultaneously subjecting the light oil fraction of direct coal liquefaction oil to alkylation and hydrogenation reactions. The light oil fraction contains most of the phenolic substances found in direct coal liquefaction oil. These phenolic substances undergo hydrodeoxygenation with hydrogen, thereby reducing the oxygen content in the light oil fraction and converting the abundant phenolic substances in the raw material into aromatics or alkylbenzenes. Aromatics and alkylbenzenes are components of the target product, aviation kerosene, which improves the quality and yield of aviation kerosene. Simultaneously, the hydrogenation reaction achieves hydrodesulfurization and denitrification, removing heteroatoms such as O, S, and N, thus improving the quality of the coal-based aviation kerosene. The light oil fraction and methanol undergo alkylation and carbon enrichment reactions, converting the light oil fraction into aviation kerosene fraction, improving the utilization rate of direct coal liquefaction oil and methanol, and increasing the yield of aviation kerosene components. The alkylation reaction is carried out in a hydrogen-rich environment, which helps to slow down the carbon deposition rate of the catalyst used in the alkylation reaction, thereby extending the catalyst's lifespan and reducing catalyst costs. This invention uses light oil fractions from direct coal liquefaction oil and methanol as the main raw materials. These materials are widely available and inexpensive, which helps to improve the utilization rate of direct coal liquefaction oil and methanol, increase the yield of coal-based aviation kerosene, and reduce production costs while realizing the high-value utilization of direct coal liquefaction oil and methanol.

[0010] In some embodiments, in step (1), the cutting temperature of the light oil fraction is ≤230°C;

[0011] And / or, in step (2), the cutting temperature of the coal-based aviation kerosene is ≥150℃.

[0012] In some embodiments, in step (2), the molar ratio of methanol to light oil fraction is (0.5-2):3;

[0013] And / or, the alkylation and hydrogenation reactions are carried out at temperatures of 200–460°C;

[0014] And / or, the reaction time for the alkylation and hydrogenation reactions is 0.25 to 4 hours;

[0015] And / or, the reaction pressure of the alkylation reaction and the hydrogenation reaction is 4 to 20 MPa.

[0016] In some embodiments, in step (2), the hydrogenation reaction uses a hydrogenation catalyst; the hydrogenation catalyst includes an active component and a support; the active component includes Cu.

[0017] In some embodiments, the active component in the hydrogenation catalyst has a weight content of 0.1% to 8% based on metal elements;

[0018] And / or, the carrier includes at least one of inorganic oxides or molecular sieves.

[0019] In some embodiments, in step (2), the mass ratio of the hydrogenation catalyst to the light oil fraction is 1 to 30:100.

[0020] In some embodiments, in step (2), the alkylation reaction is carried out using an alkylation catalyst; the alkylation catalyst includes an active component and a support; the active component includes at least one of Mo and Ni elements.

[0021] In some embodiments, the active component in the alkylation catalyst has a weight content of 0.1% to 5% based on metal elements;

[0022] And / or, the carrier comprises at least one of molecular sieves; preferably, the molecular sieve comprises at least one of ZSM-11 or MCM-22;

[0023] And / or, the mass ratio of the alkylation catalyst to the light oil fraction is 0.5 to 20:100.

[0024] This invention provides a coal-based aviation kerosene, which is prepared by the method described in this invention. In this embodiment, the coal-based aviation kerosene is a coal direct liquefaction oil-based aviation kerosene. The light oil fraction of the coal direct liquefaction oil undergoes alkylation and hydrogenation reactions to obtain the coal-based aviation kerosene, which exhibits excellent fuel performance. This method achieves high-value utilization of coal direct liquefaction oil and methanol while reducing the production cost of aviation kerosene.

[0025] In some embodiments, the density of the coal-based aviation kerosene is ≥0.89 g / cm³. 3 ;

[0026] And / or, the net calorific value of the coal-based aviation kerosene is ≥43.0 MJ / kg. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] A method for preparing coal-based aviation kerosene according to an embodiment of the present invention includes the following steps:

[0029] (1) Light oil fraction is obtained by distilling and cutting coal direct liquefaction oil;

[0030] (2) The light oil fraction, methanol and hydrogen are subjected to alkylation and hydrogenation reactions to obtain reaction products; the reaction products are distilled and cut to obtain coal-based aviation kerosene.

[0031] The method for preparing coal-based aviation kerosene according to this invention involves simultaneously subjecting the light oil fraction of direct coal liquefaction oil to alkylation and hydrogenation reactions to obtain coal-based aviation kerosene. The light oil fraction contains most of the phenolic substances found in direct coal liquefaction oil. These phenolic substances undergo hydrodeoxygenation with hydrogen, thereby reducing the oxygen content in the light oil fraction and converting the abundant phenolic substances in the raw material into aromatics or alkylbenzenes. Aromatics and alkylbenzenes are components of the target product, aviation kerosene, which improves the quality and yield of the aviation kerosene. Simultaneously, the hydrogenation reaction achieves hydrodesulfurization and denitrification, removing heteroatoms such as O, S, and N, further improving the quality of the coal-based aviation kerosene. The light oil fraction and methanol undergo an alkylation carbonization reaction, converting the light oil fraction into an aviation kerosene fraction, increasing the utilization rate of direct coal liquefaction oil and methanol, and increasing the yield of aviation kerosene components. The alkylation reaction is carried out in a hydrogen-rich environment, which helps to slow down the carbon deposition rate of the catalyst used in the alkylation reaction, thereby extending the catalyst's lifespan and reducing catalyst costs. This invention uses light oil fractions from direct coal liquefaction oil and methanol as the main raw materials. These materials are widely available and inexpensive, which helps to improve the utilization rate of direct coal liquefaction oil and methanol, increase the yield of coal-based aviation kerosene, and reduce production costs while realizing the high-value utilization of direct coal liquefaction oil and methanol.

[0032] In some embodiments, in step (1), the cutting temperature of the light oil fraction is ≤230℃, specifically, for example, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃; the light oil fraction is a fraction with a cutting temperature not higher than the cutting temperature. In a specific embodiment, the cutting temperature of the light oil fraction is 230℃, that is, the light oil fraction is a coal direct liquefaction oil fraction with a cutting temperature of ≤230℃.

[0033] In some embodiments, in step (2), the cutting temperature of the coal-based aviation kerosene is ≥150℃, specifically, for example, 150℃, 170℃, 180℃, 190℃, 200℃, 220℃, 250℃, 300℃; the coal-based aviation kerosene is a fraction with a cutting temperature not lower than the cutting temperature. In a specific embodiment, the coal-based aviation kerosene is a fraction with a temperature ≥150℃, more specifically, a fraction with a temperature of 150 to 300℃.

[0034] In some embodiments, in step (2), the molar ratio of methanol to light oil fraction is (0.5-2):3, specifically, for example, 0.5:3, 1:3, 2:3.

[0035] In this embodiment of the invention, the molar ratio of methanol to light oil fraction is (0.5-2):3, which is beneficial to further improve the conversion efficiency of light oil fraction and methanol in the preparation of aviation kerosene, and improve the aviation kerosene yield and fuel performance.

[0036] In some embodiments, the temperature of the alkylation and hydrogenation reactions is 200–460°C, specifically, for example, 200°C, 300°C, 420°C, 430°C, 435°C, or 460°C; the reaction time is 0.25–4 h, specifically, for example, 0.25 h, 0.5 h, 1 h, 2 h, 3 h, or 4 h; and the reaction pressure is 4–20 MPa, specifically, for example, 4 MPa, 5 MPa, 6 MPa, 10 MPa, 15 MPa, or 20 MPa. Optionally, the reaction pressure is the pressure of hydrogen gas.

[0037] In this embodiment of the invention, by optimizing the temperature and time of the alkylation and hydrogenation reactions, it is beneficial to carry out the alkylation and hydrogenation reactions efficiently, which is beneficial to further improve the conversion efficiency of light oil fractions and methanol to prepare aviation kerosene, and improve the aviation kerosene yield and fuel performance.

[0038] In some embodiments, in step (2), the alkylation reaction and the hydrogenation reaction are carried out in a reaction vessel.

[0039] In some embodiments, in step (2), the hydrogenation reaction is carried out using a hydrogenation catalyst; the hydrogenation catalyst includes an active component and a support; the active component includes Cu element;

[0040] Optionally, the active component is a sulfide of a metal element, specifically a sulfide of Cu; the active component in the hydrogenation catalyst has a weight content of 0.1% to 8% based on the metal element, specifically, for example, 0.1%, 0.5%, 0.6%, 0.8%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%; the support includes at least one of inorganic oxides or molecular sieves; the inorganic oxide includes at least one of alumina and silicon oxide; the molecular sieve includes MCM-22 molecular sieve.

[0041] In this embodiment of the invention, in the presence of a hydrogenation catalyst, phenolic substances in the light oil fraction of direct coal liquefaction oil undergo a hydrodeoxygenation reaction with hydrogen, thereby reducing the oxygen content in the feedstock and yielding aromatics and alkylbenzenes, thus increasing the yield of aviation kerosene. Hydrogen-entrained conditions and a Cu-containing hydrogenation catalyst can efficiently perform the hydrodeoxygenation reaction, converting the abundant phenolic substances in the feedstock into aromatics or alkylbenzenes. This invention does not impose strict limitations on the preparation method of the hydrogenation catalyst; conventional methods in the art can be used.

[0042] In some embodiments, in step (2), the mass ratio of the hydrogenation catalyst to the light oil fraction is 1 to 30:100, specifically, for example, 1:100, 2:100, 5:100, 10:100, 15:100, 20:100, 25:100, 30:100. In these embodiments of the invention, this facilitates the efficient execution of the hydrogenation reaction.

[0043] In some embodiments, in step (2), the alkylation reaction is carried out using an alkylation catalyst; the alkylation catalyst includes an active component and a support; the active component includes at least one of Mo and Ni elements;

[0044] Optionally, the active component is a sulfide of a metal element; the active component in the alkylation catalyst has a weight content of 0.1% to 5% based on the metal element, specifically, for example, 0.1%, 0.5%, 0.8%, 1%, 2%, 3%, 4%, 5%; the support includes at least one molecular sieve; preferably, the molecular sieve includes at least one of ZSM-11 or MCM-22; the silicon-to-aluminum ratio, i.e., the silicon-to-aluminum molar ratio, of the molecular sieve is 20 to 200.

[0045] In this embodiment of the invention, in the presence of an alkylation catalyst, light distillate oil from direct coal liquefaction oil undergoes an alkylation reaction with methanol to generate coal-based aviation kerosene at 150–300°C. The method of this invention employs a hydrogen-based process, which can significantly slow down the carbon deposition rate of the alkylation catalyst, extend its service life, and reduce catalyst costs. This invention does not impose strict limitations on the preparation method of the alkylation catalyst; conventional methods in the art can be used. Mo and Ni-modified ZSM-11 or MCM-22 catalysts can significantly remove heteroatoms such as S and N, improving the quality of aviation kerosene. Simultaneously, through the alkylation carbonization reaction, light distillate oil can be converted into aviation kerosene fractions at 150–300°C, improving the utilization rate of direct coal liquefaction oil and methanol, and increasing the yield of aviation kerosene components.

[0046] In some embodiments, the mass ratio of the alkylation catalyst to the light oil fraction is 0.5 to 20:100, specifically, for example, 0.5:100, 1:100, 2:100, 5:100, 10:100, 15:100, and 20:100. In these embodiments, this facilitates the efficient execution of the alkylation reaction and the removal of heteroatoms such as S and N.

[0047] In some embodiments, in step (2), stirring is performed during the reaction process. Optionally, the rotation speed is 400-800 rpm, specifically, for example, 400 rpm, 500 rpm, 600 rpm, 700 rpm, or 800 rpm.

[0048] This invention discloses a coal-based aviation kerosene, prepared by the method described in this invention. In this embodiment, the coal-based aviation kerosene is a coal direct liquefaction oil-based aviation kerosene. The light oil fraction of the coal direct liquefaction oil undergoes alkylation and hydrogenation reactions to obtain the coal-based aviation kerosene, which exhibits excellent fuel performance. This method achieves high-value utilization of coal direct liquefaction oil and methanol while reducing the production cost of aviation kerosene.

[0049] In some embodiments, the density of the coal-based aviation kerosene is ≥0.89 g / cm³. 3 .

[0050] In some embodiments, the net calorific value of the coal-based aviation kerosene is ≥43.0 MJ / kg.

[0051] The present invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way.

[0052] Example 1

[0053] A method for preparing coal-based aviation kerosene, comprising:

[0054] (1) Take 1 kg of coal direct liquefaction oil and obtain 270.6 g of light oil fraction with a temperature of ≤230℃ by distillation. The properties of the light oil fraction with a temperature of ≤230℃ are shown in Table 1.

[0055] (2) Take 125g of light oil fraction, 10.6g of methanol (molar ratio of methanol to light oil fraction is 1:3), 2g of hydrogenation catalyst (active component is Cu element, support is alumina, Cu element content is 0.5%) and 1g of alkylation catalyst (active component is Mo element, support is MCM-22 molecular sieve, Mo element content is 0.5%) and add them to the synthesis reactor. Seal the reactor, replace the reactor with nitrogen three times, then replace the reactor with hydrogen three times, pressurize the hydrogen in the reactor to 4MPa, turn on the stirrer, adjust the speed to 600 rpm, heat the constant temperature oil bath to 420℃, and react for 2 hours to obtain the reaction product. After the reaction is completed, remove water and light components below 150℃ by distillation to obtain 100.8g of aviation kerosene fraction, which is coal-based aviation kerosene.

[0056] The methanol conversion rate was 99.5%, and the selectivity of coal-based aviation kerosene was 93.4%. The properties of the coal-based aviation kerosene in Example 1 are shown in Table 2.

[0057] Example 2

[0058] A method for preparing coal-based aviation kerosene, comprising:

[0059] (1) Take 1 kg of coal direct liquefaction oil and distill it to obtain 280.2 g of light oil fraction with a temperature of ≤230℃. The properties of the light oil fraction with a temperature of ≤230℃ are shown in Table 1.

[0060] (2) Take 123g of light distillate oil, 10.6g of methanol (molar ratio of methanol to light oil fraction is 1:3), 2g of hydrogenation catalyst (active component is Cu element, support is alumina, Cu element content is 0.8%) and 1.5g of alkylation catalyst (active component is Ni element, support is ZSM-11 molecular sieve, Ni element content is 0.5%) and add them to the synthesis reactor. Seal the reactor, replace the reactor with nitrogen three times, then replace the reactor with hydrogen three times, pressurize the hydrogen in the reactor to 4MPa, turn on the stirrer, adjust the speed to 600 rpm, heat the constant temperature oil bath to 420℃, and react for 2 hours to obtain the reaction product. After the reaction is completed, remove water and light components below 150℃ by distillation to obtain 89.2g of aviation kerosene fraction, which is coal-based aviation kerosene.

[0061] The methanol conversion rate was 99.1%, and the selectivity for coal-based aviation kerosene was 91.2%. The properties of the coal-based aviation kerosene in Example 2 are shown in Table 2.

[0062] Example 3

[0063] A method for preparing coal-based aviation kerosene, comprising:

[0064] (1) Take 1 kg of coal direct liquefaction oil and obtain 274.2 g of light oil fraction with a temperature of ≤230℃ by distillation. The properties of the light oil fraction with a temperature of ≤230℃ are shown in Table 1.

[0065] (2) Take 127g of light oil fraction, 10.6g of methanol (molar ratio of methanol to light oil fraction is 1:3), 2g of hydrogenation catalyst (active component is Cu element, support is silicon oxide, Cu element content is 0.6%) and 1g of alkylation catalyst (active component is Mo element, support is MCM-22 molecular sieve, Mo element content is 1.0%) and add them to the synthesis reactor. Seal the reactor, replace the reactor with nitrogen three times, then replace the reactor with hydrogen three times, pressurize the hydrogen in the reactor to 5MPa, turn on the stirrer, adjust the speed to 600 rpm, heat the constant temperature oil bath to 420℃, and react for 2 hours to obtain the reaction product. After the reaction is completed, remove water and light components below 150℃ by distillation to obtain 98.2g of aviation kerosene fraction, which is coal-based aviation kerosene.

[0066] The methanol conversion rate was 99.6%, and the selectivity for coal-based aviation kerosene was 95.0%. The properties of the coal-based aviation kerosene in Example 3 are shown in Table 2.

[0067] Example 4

[0068] A method for preparing coal-based aviation kerosene, comprising:

[0069] (1) Take 1 kg of coal direct liquefaction oil and obtain 271.6 g of light oil fraction with a temperature of ≤230℃ by distillation. The properties of the light oil fraction with a temperature of ≤230℃ are shown in Table 1.

[0070] (2) Take 128g of light oil fraction, 16.0g of methanol (molar ratio of methanol to light oil fraction is 1:2), 2g of hydrogenation catalyst (active component is Cu element, support is MCM-22 molecular sieve, Cu element content is 1.0%) and 1g of alkylation catalyst (active component is Mo element, support is MCM-22 molecular sieve, Mo element content is 0.8%) and add them to the synthesis reactor. Seal the reactor, replace the reactor with nitrogen three times, then replace the reactor with hydrogen three times, pressurize the hydrogen in the reactor to 5MPa, turn on the stirrer, adjust the speed to 600 rpm, heat the constant temperature oil bath to 430℃, and react for 2 hours to obtain the reaction product. After the reaction is completed, remove water and light components below 150℃ by distillation to obtain 103.8g of aviation kerosene fraction, which is coal-based aviation kerosene.

[0071] The methanol conversion rate was 99.8%, and the selectivity for coal-based aviation kerosene was 95.4%. The properties of the coal-based aviation kerosene in Example 4 are shown in Table 2.

[0072] Example 5

[0073] A method for preparing coal-based aviation kerosene, comprising:

[0074] (1) Take 1 kg of coal direct liquefaction oil and distill it to obtain 258.4 g of light oil fraction with a temperature of ≤230℃. The properties of the light oil fraction with a temperature of ≤230℃ are shown in Table 1.

[0075] (2) Take 129g of light oil fraction, 16.0g of methanol (molar ratio of methanol to light oil fraction is 1:2), 2g of hydrogenation catalyst (active component is Cu element, support is silicon oxide, Cu element content is 0.4%) and 1g of alkylation catalyst (active component is Ni element, support is MCM-22 molecular sieve, Ni element content is 0.8%) and add them to the synthesis reactor. Seal the reactor, replace the reactor with nitrogen three times, then replace the reactor with hydrogen three times, pressurize the hydrogen in the reactor to 6MPa, turn on the stirrer, adjust the speed to 600 rpm, heat the constant temperature oil bath to 435℃, and react for 2 hours to obtain the reaction product. After the reaction is completed, remove water and light components below 150℃ by distillation to obtain 106.1g of aviation kerosene fraction, which is coal-based aviation kerosene.

[0076] The methanol conversion rate was 99.7%, and the selectivity for coal-based aviation kerosene was 95.0%. The properties of the coal-based aviation kerosene in Example 5 are shown in Table 2.

[0077] Comparative Example 1

[0078] The preparation method is the same as in Example 1, except that no hydrogenation catalyst is added.

[0079] The methanol conversion rate was 97.6%, and the selectivity for coal-based aviation kerosene was 84.4%. The properties of the coal-based aviation kerosene in Comparative Example 1 are shown in Table 2.

[0080] Table 1 Properties of light oil fractions ≤230℃ in Examples 1-5

[0081]

[0082] Table 2 Properties of Coal-Based Aviation Kerosene Products in Examples 1-5

[0083]

[0084] In Examples 1-5, the methanol conversion rate was higher than 99%, and the selectivity of coal-based aviation kerosene was higher than 91%. This invention uses direct coal liquefaction oil and methanol as main raw materials, and alkylates and hydrogenates the light oil fraction of direct coal liquefaction oil to obtain coal-based aviation kerosene. This achieves high-value utilization of the light oil fraction of direct coal liquefaction oil and methanol, while reducing the production cost of aviation kerosene. In Comparative Example 1, the selectivity of coal-based aviation kerosene was 84.4%, which is relatively low. This is because the molecular sieve alkylation catalyst has strong acidity, and carbon deposition easily occurs during the alkylation reaction, reducing the catalyst's activity and thus decreasing the selectivity of the target product. In Example 1, the simultaneous hydrogenation reaction effectively prevents carbon deposition, maintains the activity of the alkylation catalyst, and generates more of the target product.

[0085] As can be seen from Table 2, the density ρ of the coal-based aviation kerosene prepared in Examples 1-5 is >0.89 g / cm³. 3 The net calorific value is >43.0 MJ / kg. It is evident that, compared to Comparative Example 1, the coal-based aviation kerosene of Examples 1-5 exhibits superior fuel performance.

[0086] The coal-based aviation kerosene of Examples 1-5 of this invention has sulfur content below 3 mg / L and nitrogen content below 5 mg / L, indicating that sulfur and nitrogen have been removed. However, in Comparative Example 1, without the addition of a hydrogenation catalyst, the content of S and N heteroatoms in the coal-based aviation kerosene product is relatively high. The embodiments of this invention, through alkylation and hydrogenation processes, can significantly remove S and N heteroatoms, improving the quality of coal-based aviation kerosene and yielding high-quality, high-performance coal-based aviation kerosene.

[0087] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A method for preparing coal-based aviation kerosene, characterized in that, Includes the following steps: (1) Light oil fraction is obtained by distilling and cutting coal direct liquefaction oil; (2) The light oil fraction, methanol and hydrogen are subjected to alkylation and hydrogenation reactions to obtain reaction products; the reaction products are distilled and cut to obtain coal-based aviation kerosene; In step (2), the hydrogenation reaction uses a hydrogenation catalyst; the hydrogenation catalyst includes an active component and a support; the active component includes Cu element; In step (2), the alkylation reaction is carried out using an alkylation catalyst; the alkylation catalyst includes an active component and a support; the active component includes at least one of Mo and Ni elements.

2. The method for preparing coal-based aviation kerosene according to claim 1, characterized in that, In step (1), the cutting temperature of the light oil fraction is ≤230℃; And / or, in step (2), the cutting temperature of the coal-based aviation kerosene is ≥150℃.

3. The method for preparing coal-based aviation kerosene according to claim 1, characterized in that, In step (2), the molar ratio of methanol to light oil fraction is (0.5-2):3; And / or, the alkylation and hydrogenation reactions are carried out at temperatures of 200–460 °C; And / or, the reaction time for the alkylation and hydrogenation reactions is 0.25 to 4 hours; And / or, the reaction pressure for the alkylation and hydrogenation reactions is 4–20 MPa.

4. The method for preparing coal-based aviation kerosene according to claim 1, characterized in that, The active component in the hydrogenation catalyst has a weight content of 0.1% to 8% based on metal elements; And / or, the support in the hydrogenation catalyst includes at least one of inorganic oxides or molecular sieves.

5. The method for preparing coal-based aviation kerosene according to claim 1, characterized in that, In step (2), the mass ratio of the hydrogenation catalyst to the light oil fraction is 1 to 30:

100.

6. The method for preparing coal-based aviation kerosene according to claim 1, characterized in that, The active component in the alkylation catalyst has a weight content of 0.1% to 5% based on the metal element. And / or, the support in the alkylation catalyst includes at least one of molecular sieves; And / or, the mass ratio of the alkylation catalyst to the light oil fraction is 0.5 to 20:

100.

7. The method for preparing coal-based aviation kerosene according to claim 6, characterized in that, The molecular sieve in the alkylation catalyst includes at least one of ZSM-11 or MCM-22.

8. The method for preparing coal-based aviation kerosene according to claim 1, characterized in that, The density of the coal-based aviation kerosene is ≥0.89 g / cm³. 3 ; And / or, the net calorific value of the coal-based aviation kerosene is ≥43.0 MJ / kg.

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