A method for screening raw materials for high-yield sustainable aviation fuel

Abstract

The present invention discloses a method for screening raw materials of high-yield sustainable aviation fuel, comprising the following steps: obtaining the fatty acid composition and content of different waste animal and vegetable oils; analyzing the position of chemical bond breakage when different fatty acids in waste animal and vegetable oils are hydrodeoxygenated, cracked, and isomerized to generate sustainable aviation fuel, and obtaining the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids; calculating the theoretical yield of sustainable aviation fuel prepared from different waste animal and vegetable oils as raw materials according to the fatty acid composition and content of different waste animal and vegetable oils and the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids; selecting suitable animal and vegetable oils as raw materials for producing sustainable aviation fuel according to the theoretical yield of sustainable aviation fuel. The present invention theoretically analyzes the logical relationship between the theoretical yield of sustainable aviation fuel and the fatty acid composition in oil, and provides guidance for enterprises to produce oil-based bio-jet fuel with high efficiency, high yield, and high value.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation fuel preparation, and in particular relates to a raw material screening method for high-yield sustainable aviation fuel. Background Art

[0002] Sustainable aviation fuel (SAF), also known as biojet fuel, is a new type of aviation fuel made from waste animal and plant oils (such as vegetable oil, animal and plant fats, waste cooking oil, etc.). Compared with traditional aviation fuel, sustainable aviation fuel has the outstanding advantage of cleanliness. Aviation fuel accounts for about 80% of the total carbon emissions in the aviation industry. Due to the need to carry heavy loads for long-distance flights and cope with different flight environments, the aviation industry has stringent requirements on the performance of fuel and needs to use fossil fuels. Therefore, it is difficult for the aviation industry to reduce carbon emissions. Under the background of "carbon neutrality", the reform and upgrading of aviation fuel has become an inevitable trend, and sustainable aviation fuel has ushered in development opportunities.

[0003] In order to reduce greenhouse gas emissions and expand the raw material sources of aviation fuel, the development of bio-jet fuel preparation technology has received increasing attention from many countries, and oil-based bio-jet fuel process equipment technology is one of them. Vegetable oils or waste oils are transformed into bio-jet fuel that can be used for aircraft through a series of complex chemical reactions and physical treatments. The emergence of this new technology not only solves the problem of global edible oil surplus, but also solves the problem of food contamination caused by waste oil and sewage from restaurants, and at the same time opens up a new path for the sustainable development of aviation industry based on renewable bioenergy.

[0004] At present, in the production of sustainable aviation fuel (SAF), especially in the process of using waste animal and plant oils (such as cooking oil and gutter oil) as raw materials to manufacture new aviation fuel, the yields of various companies vary greatly, ranging from 30% to 78%. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a method for screening raw materials for high-yield sustainable aviation fuel, so as to solve the problem of low yield and unstable yield in the production of sustainable aviation fuel using waste animal and plant oils.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for screening raw materials for high-yield sustainable aviation fuel comprises the following steps:

[0008] S1. Obtain the composition and content of fatty acids in different waste animal and vegetable oils;

[0009] S2. Analyze the locations of chemical bond breakage when different fatty acids in waste animal and vegetable oils are hydrodeoxygenated, cracked, and isomerized to produce sustainable aviation fuel, and obtain the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids;

[0010] S3. Calculate the theoretical yield of sustainable aviation fuel prepared from different waste animal and vegetable fats and oils based on the composition and content of fatty acids in waste animal and vegetable fats and oils, and the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids;

[0011] The theoretical yield of sustainable aviation fuel is calculated as follows:

[0012]

[0013] In the formula, A i is the content of different fatty acids in waste animal and vegetable oils and fats, P i is the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids, and η is the theoretical yield of sustainable aviation fuel;

[0014] S4. Based on the theoretical yield of sustainable aviation fuel, select appropriate animal and plant fats and oils as raw materials for producing sustainable aviation fuel.

[0015] Preferably, in step S1, the waste animal and plant oils are one or more of waste restaurant oil, gutter oil, swill oil, oleic acid-based vegetable oil, linoleic acid-based vegetable oil, and medium-chain fatty acid-based vegetable oil.

[0016] Preferably, oleic acid-based vegetable oils include one or more of low-erucic acid rapeseed oil, high-erucic acid rapeseed oil, camellia oil, swill oil, palm oil, and olive oil; linoleic acid-based vegetable oils include one or more of sunflower oil, cottonseed oil, and soybean oil; medium-chain fatty acid-based vegetable oils include at least one of palm kernel oil and coconut oil.

[0017] Preferably, when the fatty acid is an unsaturated fatty acid, in step S2, the theoretical limit yield of the unsaturated fatty acid for preparing sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization is calculated according to the theoretical limit yield of the unsaturated fatty acid for generating alkanes by hydrodeoxygenation and the theoretical limit yield of the alkanes generated by hydrodeoxygenation for generating sustainable aviation fuel by cracking;

[0018] The theoretical limit yield of unsaturated fatty acids for preparing sustainable aviation fuel is calculated as follows: Q i =B i ×C i

[0019] In the formula, Q i Theoretical limit yield of unsaturated fatty acids for preparing sustainable aviation fuel, B iis the theoretical limit yield of unsaturated fatty acids to generate alkanes by hydrodeoxygenation, C i The theoretical limit of the yield of sustainable aviation fuels after cracking the alkanes produced by hydrodeoxygenation;

[0020] When the fatty acid is a saturated fatty acid, the theoretical limit yield of alkane produced by hydrodeoxygenation of the saturated fatty acid is used as the theoretical limit yield of saturated fatty acid for preparing sustainable aviation fuel.

[0021] Preferably, when the animal and plant fats and oils are mainly unsaturated fatty acid glycerides, in step S3, the theoretical yield of preparing sustainable aviation fuel using unsaturated fatty acid glycerides as the main raw material is calculated based on the composition and content of unsaturated fatty acids in the fats and oils and the theoretical limit yield of generating sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization of unsaturated fatty acids.

[0022] Preferably, when the animal and plant fats are mainly saturated fatty acid glycerides, in step S3, the theoretical yield of preparing sustainable aviation fuel using saturated fatty acid glycerides as the main raw material is calculated based on the composition and content of saturated fatty acids and unsaturated fatty acids in the fats and the theoretical limit yield of sustainable aviation fuel.

[0023] Preferably, in step S2, when analyzing the locations of chemical bond breakages of different fatty acids in waste animal and vegetable oils and fats during hydrodeoxygenation, cracking and isomerization to generate sustainable aviation fuel, fatty acid decarboxylation and decarbonylation reactions are not considered.

[0024] Preferably, in step S2, when analyzing the locations of chemical bond breakage in the generation of sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization of different fatty acids in waste animal and vegetable oils and fats, the repolymerization of carbon dioxide, ethane, propane and naphtha generated in the production process is not considered.

[0025] Preferably, in step S2, when analyzing the locations of chemical bond breakage in the production of sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization of different fatty acids in waste animal and vegetable oils and fats, the catalytic cracking reaction of long-chain alkanes is not considered.

[0026] Preferably, the long chain alkanes include 15-alkane, 17-alkane and 18-alkane.

[0027] The beneficial effects of the present invention are:

[0028] Starting from the molecular structure of oils and fats, the present invention theoretically analyzes the possible locations where chemical bonds may break when different fatty acids in oils and fats are hydrodeoxygenated, cracked, and isomerized to generate alkanes (sustainable aviation fuel SAF), and summarizes the logical relationship between the theoretical yield of sustainable aviation fuel SAF and the fatty acid composition in the oils and fats, thereby providing a raw material screening method for high-yield SAF, providing guidance for the efficient and high-yield production of oil-based bio-jet fuel. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The method for screening raw materials of sustainable aviation fuel (biofuel) provided in an embodiment of the present invention comprises the following steps:

[0031] (1) Obtaining fatty acid composition and content of different waste vegetable oils

[0032] According to the information, the main unsaturated fatty acid composition of European rapeseed oil is: oleic acid about 72%, linoleic acid about 12%, linolenic acid about 5%, erucic acid about 3%. The total unsaturated fatty acid content is about 92%. Saturated fatty acids are about 8%, including about 6% palmitic acid and about 2% stearic acid.

[0033] The main unsaturated fatty acid composition of Chinese high-erucic acid rapeseed oil is: about 13% oleic acid, about 12% linoleic acid, about 8% linolenic acid, about 9% eicosenoic acid, about 51% erucic acid. The total unsaturated fatty acid content is about 93%. The saturated fatty acid is about 7%, of which palmitic acid is about 5% and stearic acid is about 2%.

[0034] The main unsaturated fatty acid composition of swill oil is: about 36% oleic acid, about 29% linoleic acid, about 3% linolenic acid. The total unsaturated fatty acid content is about 71%. The saturated fatty acid is about 29%, of which about 22% is palmitic acid and about 7% is stearic acid.

[0035] The main unsaturated fatty acid composition of soybean oil is: oleic acid about 28%, linoleic acid about 53%, linolenic acid about 5%. The total unsaturated fatty acid content is about 86%. Saturated fatty acids are about 14%, of which palmitic acid is about 10% and stearic acid is about 4%.

[0036] The main unsaturated fatty acid composition of palm oil is: oleic acid about 40%, linoleic acid about 10%. The total unsaturated fatty acid content is about 50%. Saturated fatty acids are about 50%, of which palmitic acid is about 45% and stearic acid is about 5%.

[0037] The fatty acid composition of palm kernel oil is: about 9% caprylic acid, about 10% capric acid, about 50% lauric acid, about 15% myristic acid, about 5% palmitic acid. The unsaturated fatty acid oleic acid is about 10%.

[0038] Coconut oil fatty acid composition: about 8% caprylic acid, about 6% capric acid, about 49% lauric acid, about 17% myristic acid, about 13% palmitic acid. Unsaturated fatty acids include about 6% oleic acid and about 1% linoleic acid.

[0039] (2) Analyze the theoretical limit yield of bio-jet fuel produced by hydrodeoxygenation, cracking and isomerization of different fatty acids in oils and fats (excluding the decarboxylation and decarbonylation reactions of fatty acids, and the repolymerization and utilization of carbon dioxide, ethane, propane and naphtha produced during the production process. The catalytic cracking of long-chain alkanes 15-alkanes, 17-alkanes and 18-alkanes is also not considered)

[0040] Biomass oils such as fatty acid glycerides, fatty acid esters and fatty acids can be directly converted into straight-chain hydrocarbon compounds through hydrodeoxygenation, namely biomass deoxygenated oil. The isomerization degree of alkanes between C8 and C16 generated by hydrocracking isomerization of the straight-chain alkanes after hydrodeoxygenation is relatively high, and can be used as bio-jet fuel.

[0041] The principle of preparing sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization of oils and fats is as follows:

[0042] The first step is hydrodeoxygenation treatment: deoxygenation from raw fats and oils in a hydrogen atmosphere, converting unsaturated bonds into saturated bonds, increasing the saturation and stability of oils and fats. The result of hydrodeoxygenation is straight-chain alkanes (normal alkanes).

[0043]

[0044]

[0045] The second step is cracking and isomerization: straight-chain alkanes are cracked and hydroisomerized under a catalyst to obtain isoalkanes (biojet fuel).

[0046] Octane, an alkane with a carbon number of 8, is produced by hydrodeoxygenation of caprylic acid. The theoretical maximum yield of caprylic acid and caprylic glyceride converted into bio-jet fuel by extreme hydrogenation and deoxygenation is 69%.

[0047] Decanoic acid is hydrodeoxygenated to produce decane, a 10-carbon alkane. The theoretical limit yield of converting decanoic acid and decanoic acid glyceride into bio-jet fuel by extreme hydrogenation and deoxygenation is 74%.

[0048] Lauric acid is hydrodeoxygenated to generate -12-alkanes. The theoretical limit yield of dodecanoic acid and dodecanoic acid glyceride converted into bio-jet fuel by extreme hydrogenation and deoxygenation is 77%.

[0049] Myristic acid is hydrodeoxygenated to generate -14-alkanes. The theoretical limit yield of myristic acid and myristic acid glyceride converted into bio-jet fuel by extreme hydrogenation and deoxygenation is 80%.

[0050] Palmitic acid is hydrodeoxygenated to generate -16 alkanes. The theoretical limit yield of hexadecanoic acid and hexadecanoic acid glyceride converted into bio-jet fuel by extreme hydrogenation and deoxygenation is 82%.

[0051] Oleic acid (octadecenoic acid) is deoxygenated, cracked, and isomerized to generate - double bond positions are completely broken to generate two nonanes (double bond positions 9=10). The theoretical limit yield of oleic acid being converted into alkanes by extreme hydrogenation and deoxygenation is 84%, and the yield of bio-jet fuel produced by catalytic cracking of alkanes by extreme hydrogenation and deoxygenation is 100%.

[0052] Linoleic acid (octadecadienoic acid) is deoxygenated, cracked, and isomerized to generate - double bond positions are completely broken to generate one part nonane, one part hexane (solvent oil), and one part propane (liquefied gas) (double bond positions 9=10, 12=13). The theoretical limit yield of linoleic acid to convert to alkanes by extreme hydrogenation and deoxygenation is 84%, and the yield of bio-jet fuel produced by catalytic cracking of extremely hydrogenated and deoxygenated alkanes is 50%, bio-solvent oil is 33.3%, and liquefied gas is 16.7%.

[0053] Linolenic acid (octadecatrienoic acid) is deoxygenated, cracked, and isomerized to generate - double bond positions are completely broken to generate one part of nonane and three parts of propane (liquefied gas) (double bond positions 9=10, 12=13, 15=16). The theoretical limit yield of linolenic acid being extremely hydrogenated and deoxygenated to convert into alkanes is 84%, and the yield of bio-jet fuel produced by catalytic cracking of extremely hydrogenated and deoxygenated alkanes is 50%, and liquefied gas is 50%.

[0054] Eicosenoic acid is deoxygenated, cracked, and isomerized to generate - double bond positions are completely broken to generate one part of undecane and one part of nonane (double bond position 11=12). The theoretical limit yield of eicosenoic acid to convert to alkanes by extreme hydrogenation and deoxygenation is 85%, and the yield of extremely hydrogenated and deoxygenated alkanes to bio-jet fuel by catalytic cracking is 100%.

[0055] Erucic acid (docosaenoic acid) is deoxygenated, cracked, and isomerized to generate - the double bond position is completely broken to generate one part of tridecane and one part of nonane (double bond position 13=14). The theoretical limit yield of extreme hydrodeoxygenation to alkane is 86%, and the yield of extreme hydrodeoxygenated alkane catalytic cracking to bio-jet fuel is 100%.

[0056] (3) Calculate the theoretical yield of sustainable aviation fuel prepared from different vegetable oils and fats based on the fatty acid composition of different vegetable oils and fats and the theoretical limit yield of sustainable aviation fuel prepared by extreme hydrogenation, saturation and double bond removal of different fatty acids, catalytic hydrogenation and deoxygenation, and catalytic cracking;

[0057] 3.1 Yield of bio-jet fuel from sewage oil

[0058] The double bond of oleic acid is completely broken to generate nonane. The yield is 36%×84%×100%=30.24% (octadecenoic acid). Bio-jet fuel 30.24%

[0059] The double bond position of linoleic acid is completely broken to generate nonane. The yield is 29%×84%×50%=12.18% (octadecadienoic acid). Bio-jet fuel 12.18%

[0060] The double bond of linolenic acid is completely broken to generate nonane with a yield of 3%×84%×50%=1.26% (octadecatrienoic acid) and bio-jet fuel of 1.26%.

[0061] The theoretical yield of bio-jet fuel from sewage oil is about 30.24%+12.18%+1.26%=43.68%, that is, the yield of bio-jet fuel produced from sewage oil is about 43%.

[0062] 3.2 Bio-jet fuel yield from rapeseed oil

[0063] The double bond of oleic acid is completely broken to generate nonane with a yield of 72%×84%×100%=60.48% (octadecenoic acid) bio-jet fuel 60.48%.

[0064] The double bond of linoleic acid is completely broken to generate nonane, the yield is 12%×84%×50%=5.04% (octadecadienoic acid), bio-jet fuel is 5.04%.

[0065] The double bond of linolenic acid is completely broken to generate nonane, and the yield is 5%×84%×50%=2.10% (octadecatrienoic acid), bio-jet fuel 2.10%.

[0066] The double bond position of erucic acid is completely broken to generate tridecane and nonane with a yield of 3%×86%×100%=2.58% (docosaenoic acid) and bio-jet fuel of 2.58%.

[0067] The theoretical yield of rapeseed oil bio-jet fuel is 60.48% + 5.04% + 2.10% + 2.58% = 70.20%. (The yield of bio-jet fuel produced from low-erucic acid rapeseed oil is about 70%).

[0068] 3.3 Bio-jet fuel yield from high-erucic acid rapeseed oil

[0069] The double bond of oleic acid is completely broken to generate nonane. The yield is 13%×84%×100%=10.92% (octadecenoic acid).

[0070] The double bond of linoleic acid is completely broken to generate nonane. The yield is 2%×84%×50%=5.04% (octadecadienoic acid).

[0071] The double bond of linolenic acid is completely broken to generate nonane. The yield is 8%×84%×50%=3.36% (octadecatrienoic acid).

[0072] The double bond position of eicosenoic acid is completely broken to generate undecane and nonane. The yield is 9%×85%×100%=7.65% (eicosenoic acid).

[0073] The double bond of erucic acid is completely broken to generate tridecane and nonane, with a yield of 51% × 86% × 100% = 43.86% (docosaenoic acid)

[0074] The theoretical yield of rapeseed oil bio-jet fuel is 10.92% + 5.04% + 3.36% + 7.65% = 70.83%. (The yield of bio-jet fuel produced from high-erucic acid rapeseed oil raw material is about 70%).

[0075] 3.4 Yield of bio-jet fuel from soybean oil

[0076] The double bond of oleic acid is completely broken to generate nonane. The yield is 28%×84%×100%=23.52% (octadecenoic acid).

[0077] The double bond of linoleic acid is completely broken to generate nonane. The yield is 53%×84%×50%=22.26% (octadecadienoic acid).

[0078] The double bond of linolenic acid is completely broken to generate nonane. The yield is 5%×84%×50%=2.10% (octadecatrienoic acid).

[0079] The theoretical yield of soybean oil bio-jet fuel is 23.52% + 22.26% + 2.10% = 47.88%, that is, the yield of soybean oil raw material to produce bio-jet fuel is about 47%.

[0080] 3.5 Bio-jet fuel yield from palm oil

[0081] The double bond of oleic acid is completely broken to generate nonane. The yield is 40%×84%×100%=33.6% (octadecenoic acid).

[0082] The double bond of linoleic acid is completely broken to generate nonane. The yield is 10%×84%×50%=4.20% (octadecadienoic acid).

[0083] The theoretical yield of palm oil bio-jet fuel is 33.6% + 4.20% = 37.80%, that is, the yield of palm oil bio-jet fuel is about 37%.

[0084] 3.6 Yield of alkanes from hydrodeoxygenation, cracking and isomerization of medium-carbon fatty acid glycerides of palm kernel oil and coconut oil

[0085] Palm kernel oil: octane 9%×69%=6.21%, decane 10%×74%=7.4%, dodecane 50%×77%=38.5%, tetradecane 15%×80%=12%, hexadecane 5%×82%=4.1%, nonane 10%×84%=8.4%. The total bio-jet fuel yield is about 76.61%.

[0086] Coconut oil: octane 8%×69%=5.52%, decane 6%×74%=4.44%, dodecane 49%×77%=37.73%, tetradecane 17%×80%=13.6%, hexadecane 13%×82%=10.66%, nonane 6%×84%=5.04%, nonane 1%×84%×50%=0.42%. The total bio-jet fuel yield is about 77.41%.

[0087] The yields of bio-jet fuel prepared from different oils and fats are shown in Table 1.

[0088] Table 1

[0089]

[0090] From the above table, it can be seen that among the raw materials mainly composed of unsaturated fatty acids, the theoretical yield of bio-jet fuel prepared by using low-erucic acid rapeseed oil and high-erucic acid rapeseed oil as raw materials is the highest, about 70%. It can be seen that using rapeseed oil to produce bio-jet fuel is scientific, appropriate, has the highest yield, and has the least ineffective by-products. Therefore, in order to produce high-yield bio-jet fuel, enterprises can give priority to using rapeseed oil as raw material. For the preparation of bio-jet fuel with medium-carbon fatty acid glycerides mainly composed of saturated fatty acids as raw materials, the theoretical yields of palm kernel oil and coconut oil are comparable, and enterprises can choose appropriate raw materials according to actual conditions.

[0091] In summary, the present application realizes that the current technicians always think about the problem from the perspective of petrochemical alkane hydrogenation cracking. In fact, oil and petroleum are substances with completely different chemical structures and have different hydrogenation cracking pathways. The present invention theoretically analyzes the logical relationship between the theoretical yield of sustainable aviation fuel SAF and the fatty acid composition in oil. According to the composition of fatty acids in oil, the theoretical yield of sustainable aviation fuel prepared from it can be obtained, providing guidance for enterprises to produce oil-based bio-jet fuel with high efficiency, high yield and high value.

[0092] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For details not described in individual embodiments, reference may be made to the description in other embodiments.

[0093] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for screening raw materials for high-yield sustainable aviation fuel, characterized in that: The following steps are involved: S1. Obtain the composition and content of fatty acids in different waste animal and vegetable oils; S2. Analyze the positions of chemical bond breakage when different fatty acids in the waste animal and vegetable oils are hydrodeoxygenated, cracked, and isomerized to generate sustainable aviation fuel, and obtain the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids; When the fatty acid is an unsaturated fatty acid, the theoretical limit yield of the unsaturated fatty acid for preparing sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization is calculated according to the theoretical limit yield of alkanes produced by hydrodeoxygenation of unsaturated fatty acids and the theoretical limit yield of sustainable aviation fuel produced by cracking of alkanes produced by hydrodeoxygenation; the calculation formula for the theoretical limit yield of sustainable aviation fuel produced by unsaturated fatty acids is: In the formula, Q i Theoretical limit yield of unsaturated fatty acids for preparing sustainable aviation fuel, B i is the theoretical limit yield of unsaturated fatty acids to generate alkanes by hydrodeoxygenation, C i The theoretical limit of the yield of sustainable aviation fuels after cracking the alkanes produced by hydrodeoxygenation; When the fatty acid is a saturated fatty acid, the theoretical limit yield of alkane produced by hydrodeoxygenation of the saturated fatty acid is used as the theoretical limit yield of saturated fatty acid for preparing sustainable aviation fuel; S3. Calculate the theoretical yield of sustainable aviation fuel prepared from different waste animal and vegetable fats and oils based on the composition and content of fatty acids in waste animal and vegetable fats and oils, and the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids; The theoretical yield of sustainable aviation fuel is calculated as follows: In the formula, A i is the content of different fatty acids in waste animal and vegetable oils and fats, P i is the theoretical limit yield of sustainable aviation fuel prepared from different fatty acids, and η is the theoretical yield of sustainable aviation fuel; S4. According to the theoretical yield of the sustainable aviation fuel, selecting suitable animal and plant fats as raw materials for producing sustainable aviation fuel; In step S2, when analyzing the positions of chemical bond breakages of different fatty acids in the waste animal and vegetable oils and fats to generate sustainable aviation fuel through hydrodeoxygenation, cracking, and isomerization, fatty acid decarboxylation and decarbonylation reactions are not considered, and the repolymerization of carbon dioxide, ethane, propane, and naphtha generated in the production process is not considered, and the catalytic cracking reaction of long-chain alkanes is not considered.

2. The method for screening raw materials for high-yield sustainable aviation fuel according to claim 1, characterized in that: In step S1, the waste animal and plant oils are one or more of waste restaurant oil, gutter oil, swill oil, oleic acid-based vegetable oil, linoleic acid-based vegetable oil, and medium-chain fatty acid-based vegetable oil.

3. The method for screening raw materials for high-yield sustainable aviation fuel according to claim 2, characterized in that: The oleic acid-based vegetable oils include one or more of low-erucic acid rapeseed oil, high-erucic acid rapeseed oil, camellia oil, swill oil, palm oil, and olive oil; the linoleic acid-based vegetable oils include one or more of sunflower oil, cottonseed oil, and soybean oil; the medium-chain fatty acid-based vegetable oils include at least one of palm kernel oil and coconut oil.

4. The method for screening raw materials for high-yield sustainable aviation fuel according to claim 1, characterized in that: When the animal and plant fats are mainly unsaturated fatty acid glycerides, in step S3, the theoretical yield of preparing sustainable aviation fuel using unsaturated fatty acid glycerides as the main raw material is calculated based on the composition and content of unsaturated fatty acids in the fats and the theoretical limit yield of generating sustainable aviation fuel by hydrodeoxygenation, cracking and isomerization of unsaturated fatty acids.

5. The method for screening raw materials for high-yield sustainable aviation fuel according to claim 1, characterized in that: When the animal and plant fats are mainly saturated fatty acid glycerides, in step S3, the theoretical yield of preparing sustainable aviation fuel using saturated fatty acid glycerides as the main raw material is calculated based on the composition and content of saturated fatty acids and unsaturated fatty acids in the fats and the theoretical limit yield of sustainable aviation fuel.

6. The method for screening raw materials for high-yield sustainable aviation fuel according to claim 1, characterized in that: The long-chain alkanes include 15-alkane, 17-alkane and 18-alkane.

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