Preparation method of tobacco thermal cracking product, tobacco thermal cracking product and application of tobacco thermal cracking product

Abstract

The invention provides a preparation method of a tobacco thermal cracking product, the tobacco thermal cracking product and application of the tobacco thermal cracking product, relates to the technical field of tobacco products, and solves the technical problem that compared with a traditional cigarette, an electronic cigarette or a low-temperature heating cigarette in the prior art still has a large difference in sensory quality. The preparation method comprises the following steps: S1, stirring and heating tobacco at the temperature of 120-335 DEG C, and heating at the temperature of 120-335 DEG C in two heating sections or three heating sections; S2, introducing the tobacco thermal volatile matters, collected in the step S1, of each heating section into an organic solvent and dissolving the tobacco thermal volatile matters in an organic solvent A to obtain a tobacco thermal volatile matter mixed collection solution, and concentrating the tobacco thermal volatile matter mixed collection liquid to obtain a tobacco thermal cracking product. The prepared tobacco thermal cracking product can be used in electronic cigarettes and low-temperature heating cigarettes, and the sensory quality of the tobacco thermal cracking product can be closer to the smoking feeling when the cigarettes are burnt.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco products, and in particular to a method for preparing a tobacco thermal cracking product, the tobacco thermal cracking product and applications thereof. Background Art

[0002] The existing method for preparing tobacco high-temperature dry distillation and / or thermal cracking products is basically to collect dry distillation products in a certain temperature zone at 250°C, extract the dry distillation products with corresponding organic solvents, and evaporate the corresponding organic solvents to obtain;

[0003] In the Chinese invention patent with application number "CN201710811625.X" and patent name "A preparation method and application of refined high-temperature distillate of tobacco", the high-temperature distillate is obtained by distilling tobacco at a temperature of 200-250°C, extracting and concentrating the distillate with organic solvents, with reduced phenol content, moderate aroma, effectively reduced smoky flavor, and prominent roasted aroma and caramel aroma; electronic cigarettes using the refined high-temperature distillate can improve the intrinsic smoking quality of electronic cigarettes, making electronic cigarettes closer to the aroma and taste of traditional cigarettes.

[0004] In the Chinese utility model patent with application number "CN201520096798.4" and patent name "A distillation chamber and distillation device for heating tobacco", a self-assembled heating and aroma-producing device is used to heat tobacco to a temperature of 120-250°C under a certain oxygen flow. The tobacco is only heated but not burned, and the main aroma components generated are those with the feeling of burning tobacco. The sensory quality is closer to real cigarettes.

[0005] The tobacco dry distillate or thermal cracking product prepared by the above method is only concentrated in a certain temperature zone, and the tobacco components in the corresponding temperature zone are obtained. Whether it is an electronic cigarette or a low-temperature heated cigarette, although its equipment shows that the heating temperature is constant, it is a continuous temperature increase during the heating process. Therefore, the tobacco components released by the electronic cigarette or the low-temperature heated cigarette after heating are in a continuous phase, not in a segmented manner. Therefore, the sensory quality of existing electronic cigarettes or low-temperature heated cigarettes is still far behind that of traditional cigarettes.

[0006] The applicant has found that the prior art has at least the following technical problems:

[0007] The sensory quality of existing electronic cigarettes or low-temperature heated cigarettes still has a large gap compared with traditional cigarettes. Summary of the invention

[0008] The purpose of the present invention is to provide a method for preparing a tobacco pyrolysis product, a tobacco pyrolysis product and its application, so as to solve the technical problem that the sensory quality of electronic cigarettes or low-temperature heated cigarettes in the prior art is still far behind that of traditional cigarettes. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention provides a method for preparing a tobacco thermal cracking product, comprising the following steps:

[0011] A method for preparing tobacco thermal cracking products, characterized in that it comprises the following steps:

[0012] S1. Stir and heat the tobacco at a temperature of 120-335°C. When heated at a temperature of 120-335°C, any two of the following heating sections or three of the following heating sections are included:

[0013] S11, heating the tobacco to 175-185° C. and keeping the temperature at 175-185° C. to obtain tobacco thermal volatiles and tobacco solids;

[0014] S12, heating the tobacco or the tobacco solids obtained in the previous heating stage to 245-255° C. and keeping the temperature at 245-255° C. to obtain tobacco hot volatiles and tobacco solids;

[0015] S13, heating the tobacco solids obtained in the previous heating stage to 325-335° C. and keeping the temperature at 325-335° C. to obtain tobacco hot volatiles and tobacco solids;

[0016] Collecting tobacco hot volatiles from each heating section;

[0017] S2, passing the tobacco hot volatiles from each heating section collected in step S1 into an organic solvent and dissolving them in organic solvent A to obtain a mixed collection liquid of tobacco hot volatiles, and concentrating the mixed collection liquid of tobacco hot volatiles to obtain tobacco thermal cracking products.

[0018] Furthermore, in step S11, the tobacco is heated to 175-185° C. within 2-10 minutes and kept at 175-185° C. for 3-10 minutes to obtain tobacco hot volatiles and tobacco solids;

[0019] In step S12, the tobacco or the tobacco solids obtained in the previous heating stage are heated to 245-255° C. within 2-10 minutes and kept at 245-255° C. for 3-10 minutes to obtain tobacco hot volatiles and tobacco solids;

[0020] In the step S13, the tobacco solids obtained in the previous heating stage are heated to 325-335° C. within 2-10 minutes and kept at 325-335° C. for 3-10 minutes to obtain tobacco hot volatiles and tobacco solids.

[0021] Furthermore, in step S11, the tobacco is heated to 180° C. within 3-7 minutes and kept at 180° C. for 4-6 minutes to obtain tobacco hot volatiles and tobacco solids;

[0022] In step S12, the tobacco or the tobacco solids obtained in the previous heating stage are heated to 250° C. within 3-7 minutes and kept at 250° C. for 4-6 minutes to obtain tobacco hot volatiles and tobacco solids;

[0023] In the step S13, the tobacco solids obtained in the previous heating stage are heated to 330° C. within 3-7 minutes and kept at 330° C. for 4-6 minutes to obtain tobacco hot volatiles and tobacco solids.

[0024] Furthermore, in step S1, the stirring speed is 20 r / min-100 r / min.

[0025] Furthermore, in step S1, the tobacco is any one of flue-cured tobacco, air-cured tobacco, and sun-cured tobacco, or a mixture of any of the above.

[0026] Furthermore, in step S2, the mass ratio of the tobacco to the organic solvent A for collecting the hot volatiles of the tobacco is 1:1-10; the organic solvent A is any one or any combination of ethanol, propylene glycol, glycerol, and polyethylene glycol.

[0027] Furthermore, in step S2, the tobacco hot volatiles mixed collection liquid is concentrated by vacuum distillation, which includes the following specific steps:

[0028] ① Filter the tobacco hot volatiles mixed collection liquid through a 250-350 mesh screen to remove impurities;

[0029] ② The filtered tobacco hot volatiles mixed collection liquid is placed in a vacuum distillation device, the vacuum distillation device is set to a heating temperature of 55-65°C and a vacuum degree of 0.06-0.1MPa, and concentrated until no organic solvent A is distilled out, and then continue to concentrate for at least 10 minutes to obtain a semi-finished product A;

[0030] ③ Dissolve the semi-finished product A with an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B;

[0031] ④ Filter the semi-finished product B with a sieve to remove impurities to obtain a tobacco thermal cracking product;

[0032] The organic solvent B is any one or any combination of ethanol, propylene glycol, glycerol, and polyethylene glycol.

[0033] The present invention provides a tobacco pyrolysis product prepared by the above-mentioned method for preparing tobacco pyrolysis products.

[0034] The electronic cigarette provided by the present invention comprises a tobacco thermal cracking product prepared by the above-mentioned preparation method in the tobacco oil; the tobacco thermal cracking product accounts for 0.05%-5% of the weight of the tobacco oil.

[0035] The invention provides a low-temperature heated cigarette, wherein the flavor of the low-temperature heated cigarette contains the tobacco thermal cracking product prepared by the above-mentioned preparation method; the tobacco thermal cracking product accounts for 0.1%-10% of the weight of the flavor.

[0036] Based on the above technical solution, this embodiment can at least produce the following technical effects:

[0037] The present invention collects tobacco thermal volatiles by heating tobacco in sections, and obtains tobacco pyrolysis concentrate after concentrating the collected products. The tobacco pyrolysis product obtained by the preparation method of the present invention includes tobacco thermal volatilization, thermal dry distillation, and thermal cracking components generated during the smoking process of cigarettes, and is applied to electronic cigarettes and low-temperature heated cigarettes, and its sensory quality is closer to the smoking experience when the cigarette is burned. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0039] The tobacco used in the following embodiments and comparative examples are all flue-cured tobacco, and are all local tobacco leaves in Yunnan, the variety is Yun 87, the location is the central part, and the year is 2023.

[0040] 1. Preparation Example:

[0041] Embodiment 1:

[0042] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0043] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following two heating stages:

[0044] S11, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco from room temperature to 180° C. within 5 minutes and keeping the temperature at 180° C. for 5 minutes; obtaining tobacco thermal volatiles a and tobacco solids a, and collecting tobacco thermal volatiles a;

[0045] S12, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solid a from 180° C. to 250° C. within 5 minutes and keeping the temperature at 250° C. for 5 minutes; obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0046] S2, passing the tobacco thermal volatiles a collected in step S11 and the tobacco thermal volatiles b collected in step S12 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; obtaining a tobacco thermal volatiles collection liquid 1;

[0047] The tobacco hot volatiles mixed collection liquid 1 is concentrated by vacuum distillation, specifically:

[0048] ① Filter the tobacco hot volatiles mixed collection liquid 1 through a 300-mesh sieve to remove impurities;

[0049] ② The filtered tobacco hot volatiles mixed collection liquid 1 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60°C and the vacuum degree is set to 0.08MPa, and the organic solvent A is concentrated until no more is distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0050] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0051] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain the tobacco thermal cracking product.

[0052] Embodiment 2:

[0053] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0054] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following two heating stages:

[0055] S12, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco from room temperature to 250° C. within 5 minutes and keeping the temperature at 250° C. for 5 minutes, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0056] S13, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solids b from 250° C. to 330° C. within 3 min and keeping the temperature at 330° C. for 5 min, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0057] S2, passing the tobacco thermal volatiles b collected in step S12 and the tobacco thermal volatiles c collected in step S13 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; obtaining a tobacco thermal volatiles collection liquid 2;

[0058] The tobacco hot volatiles mixed collection liquid 2 is concentrated by vacuum distillation, specifically:

[0059] ① Filter the tobacco hot volatiles mixed collection liquid 2 through a 250-350 mesh screen to remove impurities;

[0060] ② The filtered tobacco hot volatiles mixed collection liquid 2 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60°C and the vacuum degree is set to 0.08MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0061] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0062] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain the tobacco thermal cracking product.

[0063] Embodiment 3:

[0064] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0065] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following two heating stages:

[0066] S11, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco from room temperature to 180° C. within 5 minutes and keeping the temperature at 180° C. for 5 minutes, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0067] S13, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solid a from 180° C. to 330° C. within 5 minutes and keeping the temperature at 330° C. for 5 minutes, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0068] S2, passing the tobacco thermal volatiles a collected in step S11 and the tobacco thermal volatiles c collected in step S13 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; obtaining a tobacco thermal volatiles collection liquid 3;

[0069] The tobacco hot volatiles mixed collection liquid 3 is concentrated by vacuum distillation, specifically:

[0070] ① Filter the tobacco hot volatiles mixed collection liquid 3 through a 300-mesh sieve to remove impurities;

[0071] ② The filtered tobacco hot volatiles mixed collection liquid 3 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60°C and the vacuum degree is set to 0.08MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0072] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0073] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 3.

[0074] Embodiment 4:

[0075] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0076] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following three heating stages:

[0077] S11, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco from room temperature to 180° C. within 5 minutes and keeping the temperature at 180° C. for 5 minutes, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0078] S12, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solid a from 180° C. to 250° C. within 5 minutes and keeping the temperature at 250° C. for 5 minutes, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0079] S2, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solids b from 250° C. to 330° C. within 5 minutes and keeping the temperature at 330° C. for 5 minutes, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0080] S2, passing the tobacco thermal volatiles a collected in step S11, the tobacco thermal volatiles b collected in step S12, and the tobacco thermal volatiles c collected in step S13 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; and obtaining a tobacco thermal volatiles collection liquid 4;

[0081] The tobacco hot volatiles mixed collection liquid 4 is concentrated by vacuum distillation, specifically:

[0082] ① Filter the tobacco hot volatiles mixed collection liquid 4 through a 300-mesh sieve to remove impurities;

[0083] ② The filtered tobacco hot volatiles mixed collection liquid 4 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60° C. and the vacuum degree is set to 0.08 MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0084] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0085] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 4.

[0086] Embodiment 5:

[0087] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0088] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following three heating stages:

[0089] S11, maintaining a stirring state (stirring speed of 100 r / min), heating the tobacco from room temperature to 175° C. within 2 minutes and keeping the temperature at 175° C. for 10 minutes, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0090] S12, maintaining a stirring state (stirring speed of 100 r / min), heating the tobacco solid a from 175° C. to 245° C. within 3 minutes and keeping the temperature at 245° C. for 10 minutes, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0091] S2, maintaining a stirring state (stirring speed of 100 r / min), heating the tobacco solids b from 245° C. to 325° C. within 2 min and keeping the temperature at 325° C. for 10 min, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0092] S2, passing the tobacco thermal volatiles a collected in step S11, the tobacco thermal volatiles b collected in step S12, and the tobacco thermal volatiles c collected in step S13 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is propylene glycol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:10; and obtaining a tobacco thermal volatiles collection liquid 5;

[0093] The tobacco hot volatiles mixed collection liquid 5 is concentrated by vacuum distillation, specifically:

[0094] ① Filter the tobacco hot volatiles mixed collection liquid 5 through a 350-mesh sieve to remove impurities;

[0095] ② The filtered tobacco hot volatiles mixed collection liquid 5 is placed in a vacuum distillation apparatus, the vacuum distillation apparatus is set to a heating temperature of 55° C. and a vacuum degree of 0.1 MPa, and concentrated until no organic solvent A is distilled out, and then the concentration is continued for 10 minutes to obtain a semi-finished product A;

[0096] ③ The semi-finished product A is dissolved back in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is propylene glycol;

[0097] ④ Filter the semi-finished product B with a 350-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 5.

[0098] Embodiment 6:

[0099] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0100] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following three heating stages:

[0101] S11, maintaining a stirring state (stirring speed of 20 r / min), heating the tobacco from room temperature to 185° C. within 10 min and keeping the temperature at 185° C. for 3 min, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0102] S12, maintaining a stirring state (stirring speed of 20 r / mi), heating the tobacco solid a from 185° C. to 255° C. within 10 min and keeping the temperature at 255° C. for 3 min, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0103] S2, maintaining a stirring state (stirring speed of 20 r / min), heating the tobacco solids b from 255° C. to 335° C. within 10 min and keeping the temperature at 335° C. for 3 min, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0104] S2, passing the tobacco thermal volatiles a collected in step S11, the tobacco thermal volatiles b collected in step S12, and the tobacco thermal volatiles c collected in step S13 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is a mixed solvent of ethanol: glycerol=1:1 by volume; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:1; obtaining a tobacco thermal volatiles collection liquid 6;

[0105] The tobacco hot volatiles mixed collection liquid 6 is concentrated by vacuum distillation, specifically:

[0106] ① Filter the tobacco hot volatiles mixed collection liquid 6 through a 250-mesh sieve to remove impurities;

[0107] ② The filtered tobacco hot volatiles mixed collection liquid 6 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 65° C. and the vacuum degree is set to 0.06 MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 12 minutes to obtain a semi-finished product A;

[0108] ③ The semi-finished product A is dissolved back in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is a mixed solvent of ethanol and glycerol in a volume ratio of 1:1;

[0109] ④ Filter the semi-finished product B with a 250-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 6.

[0110] Embodiment 7:

[0111] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0112] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following three heating stages:

[0113] S11, maintaining a stirring state (stirring speed of 40 r / min), heating the tobacco from room temperature to 180° C. within 4 minutes and keeping the temperature at 180° C. for 6 minutes, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0114] S12, maintaining a stirring state (stirring speed of 40 r / min), heating the tobacco solid a from 180° C. to 250° C. within 4 minutes and keeping the temperature at 250° C. for 6 minutes, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0115] S2, maintaining a stirring state (stirring speed of 40 r / min), heating the tobacco solids b from 250° C. to 330° C. within 4 min and keeping the temperature at 330° C. for 6 min, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0116] S2, passing the tobacco thermal volatiles a collected in step S11, the tobacco thermal volatiles b collected in step S12, and the tobacco thermal volatiles c collected in step S13 into an organic solvent A, wherein the organic solvent A is a mixed solvent of ethanol and polyethylene glycol in a volume ratio of 1:1; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:8; and obtaining a tobacco thermal volatiles collection liquid 7;

[0117] The tobacco hot volatiles mixed collection liquid 7 is concentrated by vacuum distillation, specifically:

[0118] ① Filter the tobacco hot volatiles mixed collection liquid 7 through a 250-mesh sieve to remove impurities;

[0119] ② The filtered tobacco hot volatiles mixed collection liquid 7 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 65° C. and the vacuum degree is set to 0.08 MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 10 minutes to obtain a semi-finished product A;

[0120] ③ The semi-finished product A is dissolved back in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is a mixed solvent of ethanol and polyethylene glycol in a volume ratio of 1:1;

[0121] ④ Filter the semi-finished product B with a 250-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 7.

[0122] Embodiment 8:

[0123] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0124] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following three heating stages:

[0125] S11, maintaining a stirring state (stirring speed of 60 r / min), heating the tobacco from room temperature to 180° C. within 5 minutes and keeping the temperature at 180° C. for 8 minutes, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0126] S12, maintaining a stirring state (stirring speed of 60 r / min), heating the tobacco solid a from 180° C. to 250° C. within 5 minutes and keeping the temperature at 250° C. for 8 minutes, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0127] S2, maintaining a stirring state (stirring speed of 60 r / min), heating the tobacco solids b from 250° C. to 330° C. within 5 minutes and keeping the temperature at 330° C. for 8 minutes, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0128] S2, passing the tobacco thermal volatiles a collected in step S11, the tobacco thermal volatiles b collected in step S12, and the tobacco thermal volatiles c collected in step S13 into an organic solvent A, wherein the organic solvent A is a mixture of ethanol and propylene glycol in a mass ratio of 1:1; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:6; and obtaining a tobacco thermal volatiles collection liquid 8;

[0129] The tobacco hot volatiles mixed collection liquid 8 is concentrated by vacuum distillation, specifically:

[0130] ① Filter the tobacco hot volatiles mixed collection liquid 8 through a 300-mesh sieve to remove impurities;

[0131] ② The filtered tobacco hot volatiles mixed collection liquid 8 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60° C. and the vacuum degree is set to 0.1 MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 18 minutes to obtain a semi-finished product A;

[0132] ③ The semi-finished product A is dissolved back in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is a mixture of ethanol and propylene glycol in a mass ratio of 1:1;

[0133] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 8.

[0134] Embodiment 9:

[0135] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0136] S1. Stir and heat the tobacco at a temperature of 120-335° C. In this embodiment, when the temperature is 120-335° C., the heating process includes the following three heating stages:

[0137] S11, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco from room temperature to 180° C. within 5 minutes and keeping the temperature at 180° C. for 6 minutes, obtaining tobacco thermal volatiles a and tobacco solids a, and collecting the tobacco thermal volatiles a;

[0138] S12, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solid a from 180° C. to 250° C. within 5 minutes and keeping the temperature at 250° C. for 6 minutes, obtaining tobacco thermal volatiles b and tobacco solids b, and collecting the tobacco thermal volatiles b;

[0139] S2, maintaining a stirring state (stirring speed of 80 r / min), heating the tobacco solids b from 250° C. to 330° C. within 5 minutes and keeping the temperature at 330° C. for 6 minutes, obtaining tobacco thermal volatiles c and tobacco solids c, and collecting the tobacco thermal volatiles c;

[0140] S2, passing the tobacco thermal volatiles a collected in step S11, the tobacco thermal volatiles b collected in step S12, and the tobacco thermal volatiles c collected in step S13 into an organic solvent A and dissolving them in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:6; obtaining a tobacco thermal volatiles collection liquid 9;

[0141] The tobacco hot volatiles mixed collection liquid 9 is concentrated by vacuum distillation, specifically:

[0142] ① Filter the tobacco hot volatiles mixed collection liquid 9 through a 300-mesh sieve to remove impurities;

[0143] ② The filtered tobacco hot volatiles mixed collection liquid 9 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60° C. and the vacuum degree is set to 0.08 MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0144] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0145] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain the tobacco thermal cracking product 9.

[0146] 2. Comparative ratio:

[0147] Comparative Example 1:

[0148] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0149] S1. Keep stirring (stirring speed is 80r / min), heat the tobacco from room temperature to 180°C within 5 minutes and keep it at 180°C for 5 minutes; obtain tobacco thermal volatiles A and tobacco solids A, and collect tobacco thermal volatiles A;

[0150] S2, passing the tobacco thermal volatiles A collected in step S1 into an organic solvent A and dissolving in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; obtaining a tobacco thermal volatiles collection liquid 1-1;

[0151] The tobacco hot volatiles mixed collection liquid 1-1 is concentrated by vacuum distillation, specifically:

[0152] ① Filter the tobacco hot volatiles mixed collection liquid 1-1 through a 300-mesh sieve to remove impurities;

[0153] ② The filtered tobacco hot volatiles mixed collection liquid 1-1 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60° C. and the vacuum degree is set to 0.08 MPa, and concentrated until no organic solvent A is distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0154] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0155] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain tobacco thermal cracking product 1-1.

[0156] Comparative Example 2:

[0157] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0158] S1. Keep stirring (stirring speed is 80r / min), heat the tobacco from room temperature to 250°C within 5 minutes and keep it at 250°C for 5 minutes; obtain tobacco thermal volatiles B and tobacco solids B, and collect tobacco thermal volatiles B;

[0159] S2, passing the tobacco thermal volatiles B collected in step S1 into an organic solvent A and dissolving in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; obtaining a tobacco thermal volatiles collection liquid 2-1;

[0160] The tobacco hot volatiles mixed collection liquid 2-1 is concentrated by vacuum distillation, specifically:

[0161] ① Filter the tobacco hot volatiles mixed collection liquid 2-1 through a 300-mesh sieve to remove impurities;

[0162] ② The filtered tobacco hot volatiles mixed collection liquid 2-1 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60°C and the vacuum degree is set to 0.08MPa, and concentrated until the organic solvent A is no longer distilled out, and then the concentration is continued for 15 minutes to obtain a semi-finished product A;

[0163] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0164] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain tobacco thermal cracking product 2-1.

[0165] Comparative Example 3:

[0166] A method for preparing a tobacco thermal cracking product comprises the following steps:

[0167] S1. Keep stirring (stirring speed is 80r / min), heat the tobacco from room temperature to 330°C within 5 minutes and keep it at 330°C for 5 minutes; obtain tobacco thermal volatiles C and tobacco solids C, and collect tobacco thermal volatiles B;

[0168] S2, passing the tobacco thermal volatiles C collected in step S1 into an organic solvent A and dissolving in the organic solvent A, wherein the organic solvent A is ethanol; the mass ratio of tobacco to the organic solvent A for collecting the tobacco thermal volatiles is 1:5; obtaining a tobacco thermal volatiles collection liquid 3-1;

[0169] The tobacco hot volatiles mixed collection liquid 3-1 is concentrated by vacuum distillation, specifically:

[0170] ① Filter the tobacco hot volatiles mixed collection liquid 3-1 through a 300-mesh sieve to remove impurities;

[0171] ② The filtered tobacco hot volatiles mixed collection liquid 3-1 is placed in a vacuum distillation apparatus, the heating temperature of the vacuum distillation apparatus is set to 60°C and the vacuum degree is set to 0.08MPa, and concentrated until no organic solvent A is distilled out, and then continue to concentrate for 15 minutes to obtain a semi-finished product A;

[0172] ③ The semi-finished product A is dissolved in an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; the organic solvent B is ethanol;

[0173] ④ Filter the semi-finished product B with a 300-mesh sieve to remove impurities to obtain tobacco thermal cracking product 3-1.

[0174] 3. Experimental Examples

[0175] 1. Detect the effective components of tobacco pyrolysis products 1 to tobacco pyrolysis products 9 obtained in Examples 1-9 and tobacco pyrolysis products 1-1, tobacco pyrolysis products 2-1, and tobacco pyrolysis products 3-1 obtained in Comparative Examples 1-3.

[0176] 1.1. Testing equipment: The testing equipment used is a gas chromatograph-mass spectrometer, 5890 / 5973 GC-MS gas chromatograph / mass spectrometer from Agilent Technologies, USA.

[0177] 1.2. Detection method:

[0178] The analysis method in the Chinese invention patent (publication number: CN101806685A, invention name: Tobacco aerobic pyrolysis analysis method and sampling system) was used to analyze the effective components of the tobacco pyrolysis products in this experimental example.

[0179] 1.3. Test results:

[0180] As shown in Table 1 and Table 2 below:

[0181] Table 1 Peak area of ​​effective components of tobacco pyrolysis products in comparative examples and examples 1-4

[0182] R Compound Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Example 4 7.008 Pyridine 0 0 0 0 4704680 6491670 16805526 7.733 2-Methylpyridine 0 0 0 0 6208707 4860476 6225027 9.221 3-Methylpyridine 0 0 1315266 0 18896752 18763924 27983160 10.259 2-Cyclopenten-1-one 42298 165650 127994 29041 2602301 5307075 10215321 10.435 2-Methyl-2-cyclopenten-1-one 79220 1094441 1128201 235634 8553951 10730287 14632743 10.743 3-Ethylpyridine 44089 319232 1638393 229133 8676739 9620431 7753540 11.560 Acetic acid 4308287 4935065 2202927 1651794 8074395 76482064 138858352 11.950 Furfural 604470 1577870 1391479 544054 4076280 22922250 49215708 12.511 2-Acetylfuran 244494 973878 722808 219786 3299703 8984631 16271359 12.721 3-Methyl-2-cyclopenten-1-one 280378 1836173 2436348 462572 9436335 14563057 18449022 12.865 Propionic acid 365452 1058845 934381 350200 2651220 9895889 22648150 12.971 2,3-Dimethyl-2-cyclopenten-1-one 121888 2620292 4343912 572106 12535688 11792564 14477793 13.435 5-Methylfurfural 2724174 6364458 4155407 2115725 6965317 41430000 67825000 14.433 Furfuryl alcohol 2042616 3483106 3801550 1238632 9169447 35689920 61496616 16.708 Guaiacol 259306 2118045 1843353 570170 3349635 14031155 19261032 16.785 nicotine 162315552 253334880 198671504 78220976 198531920 314161024 397476576 17.195 2,4-Dimethylphenol 29757 1078065 2591113 188434 5304515 5997108 4256355 17.262 Neophytadiene 12127039 16451968 7889776 5787213 8043251 31833884 32835818 18.166 phenol 7566435 37135840 58912952 10667596 87320984 141612992 158186480 18.914 p-Toluene 1801324 19605446 32802110 3738377 40821132 59050248 59535672 18.990 o-Cresol 1111133 7159023 12699355 1687614 14642313 20186012 20930430 19.778 p-Ethylphenol 944719 12606997 20089586 1837730 22641954 28330034 26040468 20.685 Maltol hydrate 3471858 5263497 3832300 726525 629029 15332731 21449978 20.942 2-Methyl-3-pyridinol 1722285 3132185 4484515 1485297 4814105 5796401 5956983 21.216 Nicotinamide 1479817 9324719 13897554 2485514 27938238 25372778 25750636 22.000 4-Pyridinol 5229713 14980009 13828196 4159075 22299572 32903070 43690176 24.232 Catechol 202200 1380949 1675038 273786 2331911 13618303 20540228 25.604 Palmitic acid 5464144 13309055 11720489 5202323 11153040 32591866 42344808 26.935 Hydroquinone 2607296 5624973 10536354 861969 11636392 21358460 22559302

[0183] Table 2 Peak areas of active ingredients in tobacco pyrolysis products in Examples 5-9

[0184] R Compound Example 5 Example 6 Example 7 Example 8 Example 9 7.008 Pyridine 17645802 13444421 11763868 17141637 23527736 7.733 2-Methylpyridine 6847530 4980022 4357519 6349528 8403786 9.221 3-Methylpyridine 31061308 22386528 19588212 28542823 37217603 10.259 2-Cyclopenten-1-one 9704555 8172257 7150725 10419627 13382071 10.435 2-Methyl-2-cyclopenten-1-one 11706194 11706194 10242920 14925398 19754203 10.743 3-Ethylpyridine 8373823 6202832 5427478 7908611 10622350 11.56 Acetic acid 111086682 111086682 97200846 141635519 191624526 11.95 Furfural 41833352 39372566 34450996 50200022 66933363 12.511 2-Acetylfuran 11389951 13017087 11389951 16596786 21640907 12.721 3-Methyl-2-cyclopenten-1-one 19371473 14759218 12914315 18818002 23983729 12.865 Propionic acid 17439076 18118520 15853705 23101113 30575003 12.971 2,3-Dimethyl-2-cyclopenten-1-one 13030014 11582234 10134455 14767349 19979354 13.435 5-Methylfurfural 77998750 54260000 47477500 69181500 81390000 14.433 Furfuryl alcohol 73180973 49197293 43047631 62726548 70721108 16.708 Guaiacol 15408826 9630516 6741361 15408826 21187135 16.785 nicotine 536593378 317981261 278233603 405426108 635962522 17.195 2,4-Dimethylphenol 2979449 1915360 2979449 2043050 4681991 17.262 Neophytadiene 29552236 26268654 22985073 33492534 34477609 18.166 phenol 79093240 71183916 47455944 28473566 166095804 18.914 p-Toluene 23814269 23814269 18456058 14883918 60131029 18.99 o-Cresol 9209389 8790781 6697738 6488433 21558343 19.778 p-Ethylphenol 8332950 11978615 8593354 8593354 27342491 20.685 Maltol hydrate 23594976 17159982 15014985 21878978 22951476 20.942 2-Methyl-3-pyridinol 6254832 4765586 4169888 6076123 7148380 21.216 Nicotinamide 26265649 20600509 18025445 26265649 38625954 22 4-Pyridinol 45874685 34952141 30583123 44563980 52428211 24.232 Catechol 6162068 8421493 6983678 7189080 22183446 25.604 Palmitic acid 45732393 33875846 29641366 16937923 46579289 26.935 Hydroquinone 4511860 9023721 6767791 11279651 24364046

[0185] 2. Applied to electronic cigarettes for smoking evaluation.

[0186] 2.1 Experimental methods:

[0187] The tobacco pyrolysis products 1 to 9 prepared in Examples 1 to 9 are sequentially added to the e-cigarette oil; meanwhile, the tobacco pyrolysis products 1-1 to 3-1 obtained in Comparative Examples 1 to 3 are sequentially added to the e-cigarette oil. Specifically:

[0188] By weight ratio, the products of tobacco pyrolysis: propylene glycol: glycerol = 5:35:60, after being mixed evenly, the solution was uniform, and added to the same type of atomizer as e-cigarette oil, and heated by the same type of atomizer heating rod. The evaluation was conducted by 7 personnel with tobacco industry sensory evaluation qualifications.

[0189] 2.2 Evaluation Method

[0190] Evaluation is carried out according to GB5606.4-2005 Cigarettes Part 4 Sensory Technical Requirements.

[0191] 2.3 Evaluation results:

[0192] As shown in Table 3 below:

[0193] Table 3 Evaluation results

[0194] Evaluation results Comparative Example 1 The aroma is small, the aroma is average, with a lighter roasted and sweet aroma Comparative Example 2 The aroma is average in quantity and quality, with a roasted aroma and a sweet, caramelized aroma. Comparative Example 3 The aroma is sufficient, the aroma quality is average, and the burnt and smoky aromas are obvious Example 1 The aroma is average in quantity and quality, with a baking aroma, a sweet burnt aroma, and a slight smoky aroma. Example 2 The aroma is sufficient, the aroma quality is average, the roasted aroma and burnt aroma are obvious, and there is a smoky aroma Example 3 The aroma is quite abundant, the aroma quality is average, with baking aroma, caramel aroma, sweet aroma, and slightly stronger smoky aroma Example 4 The aroma is sufficient and of good quality, with roasted, caramelized, sweet, and slightly smoky aroma. Example 5 The aroma volume is average, the aroma quality is good, the smoke aroma is rich, and there is basically no smoke incense Example 6 The aroma volume is average, the aroma quality is average, there is a slight baking aroma, no smoke aroma Example 7 The aroma volume is average, the aroma quality is average, with a slight baking and burnt smell, and no smoke Example 8 The aroma is sufficient and of good quality, with roasted sweetness and burnt aroma, and basically no smoky taste Example 9 The aroma is sufficient, the aroma quality is average, and the smoky and burnt smell is heavier

[0195] From the evaluation results and smoke analysis results in Table 3, the increase in the content and types of heterocyclic compounds, such as pyridines, in Examples 1-9 gave an increase in the caramel aroma components in the smoke; the increase in the content and types of furfural and furan substances in Examples 1-4 and 8 gave an increase in the baking and sweet aroma components in the smoke; the substantial increase in neophytadiene in Examples 1-9 gave the smoke richness of the smoke aroma and an increase in the amount and quality of the aroma. In Examples 5-8, due to the low solubility of phenolic substances in propylene glycol, glycerol, and polyethylene glycol, the perception of the smoky taste in the smoke was reduced. Therefore, its sensory quality is closer to that of traditional cigarettes.

[0196] 3. Applied to low-temperature heated cigarettes for smoking evaluation.

[0197] 3.1 Experimental methods:

[0198] The tobacco pyrolysis products 1 to 9 prepared in Examples 1 to 9 are sequentially added to the flavor of the low-temperature heated cigarette; meanwhile, the tobacco pyrolysis products 1-1 to 3-1 obtained in Comparative Examples 1-3 are sequentially added to the flavor of the low-temperature heated cigarette. Specifically:

[0199] According to the weight ratio, the tobacco pyrolysis product: propylene glycol = 5:95, after being fully mixed and evenly, they were added into the core material of the same type of low-temperature heated cigarette as the flavor of low-temperature heated cigarettes; at the same time, the low-temperature heated cigarettes without flavor injection were used as blank samples; and then heated by the same type of atomizing heating rod. The evaluation was conducted by 7 personnel with tobacco industry sensory evaluation qualifications.

[0200] 3.2 Evaluation Method

[0201] Evaluation is carried out according to GB5606.4-2005 Cigarettes Part 4 Sensory Technical Requirements.

[0202] 3.3 Evaluation results:

[0203] As shown in Table 4 below:

[0204] Table 4 Evaluation results:

[0205] Evaluation results Blank The aroma is sufficient, the aroma quality is average, with caramel sweetness and hay aroma Comparative Example 1 The aroma volume is average, the aroma quality is average, and the aroma harmony is reduced Comparative Example 2 The amount of aroma is average, the aroma quality is average, and the woody smell increases Comparative Example 3 The aroma is sufficient, the aroma quality is average, the smoke concentration is high, the smoky taste is strong, and the aftertaste is residual Example 1 The aroma volume is average, the aroma quality is average, and the baking sweetness is slightly increased Example 2 The aroma is sufficient, the aroma quality is average, the roasted aroma and burnt aroma are obvious, and there is a smoky aroma Example 3 The aroma is quite abundant, the aroma quality is average, with baking aroma, caramel aroma, sweet aroma, and slightly stronger smoky aroma Example 4 The aroma is sufficient and of good quality, with roasted, caramelized, sweet, and slightly smoky aroma. Example 5 The aroma volume is average, the aroma quality is good, the smoke aroma is rich, and there is basically no smoke incense Example 6 The aroma is small, the aroma is average, with a slight baking aroma and no smoke. Example 7 The aroma is small, the aroma is average, with a slight baking and burnt smell, and no smoky aroma Example 8 The aroma is sufficient and of good quality, with roasted sweetness and burnt aroma, and basically no smoky taste Example 9 The aroma is sufficient, the aroma quality is average, and the smoky and burnt smell is heavier

[0206] From the evaluation results and smoke analysis results in Table 4, the increase in the content and types of heterocyclic compounds, such as pyridines, in Examples 1-9 gives an increase in the caramel aroma components in the smoke; the increase in the content and types of furfural and furan substances in Examples 1-9 gives an increase in the baking and sweet aroma components in the smoke; the substantial increase in neophytadiene in Examples 1-9 gives the smoke a richer smoke aroma and an increase in the amount and quality of the aroma. In Examples 5-8, due to the low solubility of phenolic substances in propylene glycol, glycerol, and polyethylene glycol, the perception of smoky flavor in the smoke is reduced. Therefore, its sensory quality is closer to that of traditional cigarettes.

[0207] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing tobacco thermal cracking products, characterized in that: The steps include: S1. Stir and heat the tobacco at a temperature of 120-335°C. When heated at a temperature of 120-335°C, any two of the following heating sections or three of the following heating sections are included: S11, heating the tobacco to 175-185° C. and keeping the temperature at 175-185° C. to obtain tobacco thermal volatiles and tobacco solids; S12, heating the tobacco or the tobacco solids obtained in the previous heating stage to 245-255° C. and keeping the temperature at 245-255° C. to obtain tobacco hot volatiles and tobacco solids; S13, heating the tobacco solids obtained in the previous heating stage to 325-335° C. and keeping the temperature at 325-335° C. to obtain tobacco hot volatiles and tobacco solids; Collecting tobacco hot volatiles from each heating section; S2, passing the tobacco hot volatiles from each heating section collected in step S1 into an organic solvent and dissolving them in organic solvent A to obtain a mixed collection liquid of tobacco hot volatiles, and concentrating the mixed collection liquid of tobacco hot volatiles to obtain tobacco thermal cracking products.

2. The method for preparing tobacco thermal cracking products according to any one of claim 1, characterized in that: In the step S11, the tobacco is heated to 175-185° C. within 2-10 minutes and kept at 175-185° C. for 3-10 minutes to obtain tobacco hot volatiles and tobacco solids; In step S12, the tobacco or the tobacco solids obtained in the previous heating stage are heated to 245-255° C. within 2-10 minutes and kept at 245-255° C. for 3-10 minutes to obtain tobacco hot volatiles and tobacco solids; In the step S13, the tobacco solids obtained in the previous heating stage are heated to 325-335° C. within 2-10 minutes and kept at 325-335° C. for 3-10 minutes to obtain tobacco hot volatiles and tobacco solids.

3. The method for preparing tobacco thermal cracking products according to any one of claim 1, characterized in that: In the step S11, the tobacco is heated to 180° C. within 3-7 minutes and kept at 180° C. for 4-6 minutes to obtain tobacco hot volatiles and tobacco solids; In step S12, the tobacco or the tobacco solids obtained in the previous heating stage are heated to 250° C. within 3-7 minutes and kept at 250° C. for 4-6 minutes to obtain tobacco hot volatiles and tobacco solids; In the step S13, the tobacco solids obtained in the previous heating stage are heated to 330° C. within 3-7 minutes and kept at 330° C. for 4-6 minutes to obtain tobacco hot volatiles and tobacco solids.

4. The method for preparing tobacco thermal cracking products according to any one of claim 1, characterized in that: In the step S1, the stirring speed is 20 r / min-100 r / min.

5. The method for preparing tobacco thermal cracking products according to any one of claim 1, characterized in that: In step S1, the tobacco is any one of flue-cured tobacco, air-cured tobacco, and sun-cured tobacco, or a mixture of any of the above.

6. The method for preparing tobacco thermal cracking products according to any one of claims 1 to 5, characterized in that: In the step S2, the mass ratio of the tobacco to the organic solvent A for collecting the hot volatiles of the tobacco is 1:1-10; the organic solvent A is any one or any combination of ethanol, propylene glycol, glycerol, and polyethylene glycol.

7. The method for preparing tobacco thermal cracking products according to any one of claims 1 to 5, characterized in that: In the step S2, the tobacco hot volatiles mixed collection liquid is concentrated by vacuum distillation, which includes the following specific steps: ① Filter the tobacco hot volatiles mixed collection liquid through a 250-350 mesh screen to remove impurities; ② The filtered tobacco hot volatiles mixed collection liquid is placed in a vacuum distillation device, the vacuum distillation device is set to a heating temperature of 55-65°C and a vacuum degree of 0.06-0.1MPa, and concentrated until no organic solvent A is distilled out, and then continue to concentrate for at least 10 minutes to obtain a semi-finished product A; ③ Dissolve the semi-finished product A with an organic solvent B until the weight of the solution is consistent with the weight of the tobacco added in step S1, to obtain a semi-finished product B; ④ Filter the semi-finished product B with a sieve to remove impurities to obtain a tobacco thermal cracking product; The organic solvent B is any one or any combination of ethanol, propylene glycol, glycerol, and polyethylene glycol.

8. A tobacco pyrolysis product prepared by the method for preparing a tobacco pyrolysis product according to any one of claims 1 to 7.

9. An electronic cigarette, characterized in that: The e-cigarette oil contains a tobacco thermal cracking product prepared by the preparation method described in any one of claims 1 to 7; the tobacco thermal cracking product accounts for 0.05% to 5% of the weight of the e-cigarette oil.

10. A low temperature heated cigarette, characterized in that: The flavor of the low-temperature heated cigarette contains the tobacco thermal cracking product prepared by the preparation method described in any one of claims 1 to 7; the tobacco thermal cracking product accounts for 0.1% to 10% of the weight of the flavor.