Preparation method for tobacco extract, tobacco extract and atomization matrix

Abstract

The present disclosure provides a preparation method for a tobacco extract, a tobacco extract and an atomization matrix. The preparation method comprises: 1) performing destructive distillation and extraction on tobacco shreds of tobacco by means of solvent steam; 2) collecting a reflux component and a distillate component, respectively; and 3) compounding the reflux component and the distillate component at a mass ratio of 1:1-1:10 to obtain the tobacco extract. The contents of acid and odor compounds in the tobacco extract are lower than 0.001 μg / g.

Description

Preparation method of pipe tobacco extract, pipe tobacco extract, and atomization substrate

[0001] Cross-reference to Related Applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202411089792.4, filed on August 8, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of electronic atomization, in particular to a preparation method of pipe tobacco extract, pipe tobacco extract, and atomization substrate. BACKGROUND

[0004] An electronic cigarette is a device capable of vaporizing tobacco tar (flavor solution) into mist, giving smokers a feeling similar to smoking. Electronic cigarettes have the advantages of not needing to be burned, having less harm to the human body and the environment, and being able to meet consumers' demand for nicotine to some extent. However, compared with traditional cigarettes, the smoke generated by electronic cigarette liquid has a large gap in aroma and taste from real cigarettes, and lacks the feeling of cigarette burning. These deficiencies greatly affect the quality of electronic cigarettes and restrict the popularity and prevalence of electronic cigarettes.

[0005] Therefore, there is still a need to develop new pipe tobacco extract extraction and separation technologies to further optimize the quality of electronic cigarettes. SUMMARY

[0006] Therefore, the main purpose of the present disclosure is to provide a preparation method of pipe tobacco extract, pipe tobacco extract, and atomization substrate, wherein the preparation method does not produce organic solvent residues, has simple process operation and low cost, and the obtained product has obvious pipe tobacco characteristics, enhanced roasting aroma, significantly reduced tobacco odor, rich aroma, high concentration, and less oral residue, and the taste of the atomization substrate is closer to that of traditional cigarettes.

[0007] To achieve the above-mentioned purposes, the technical solution of the present disclosure is as follows.

[0008] The first aspect of the present disclosure provides a preparation method of pipe tobacco extract, the method comprising:

[0009] 1) dry distillation extraction of pipe tobacco by solvent vapor;

[0010] 2) collecting the reflux component and the distillate component, respectively; and

[0011] 3) compounding the reflux component and the distillate component at a mass ratio of 1:1 to 1:10 to obtain pipe tobacco extract.

[0012] In some embodiments, the solvent is selected from one or more of propylene glycol, glycerol, ethanol, water.

[0013] In some embodiments, the mass ratio of the tobacco shreds to the solvent is 1:1 to 1:5, preferably 1:3 to 1:5.

[0014] In some embodiments, the dry distillation is performed at 100°C to 400°C, preferably at a temperature of 250°C to 300°C.

[0015] In some embodiments, the reconstituting is performed at a mass ratio of the reflux component to the distillate component of 1:1 to 1:3.

[0016] In some embodiments, the method comprises one or more of the following features:

[0017] The temperature increase rate of the dry distillation is 5°C / min to 15°C / min;

[0018] The duration of the dry distillation is 1h to 4h;

[0019] The distillate component is collected at a condensation temperature of 5°C to 10°C.

[0020] A second aspect of the present application provides a tobacco extract prepared according to the preparation method of the first aspect of the present disclosure.

[0021] In some embodiments, the content of the acid and odor chemical components in the tobacco extract is less than 0.001μg / g, wherein preferably the acid and odor chemical components are selected from one or more of isovaleric acid, butyric acid, fumaric acid, phenylacetic acid, and propionic acid.

[0022] A third aspect of the present application provides an aerosolization substrate comprising the tobacco extract of the second aspect of the present application.

[0023] In some embodiments, in the aerosolization substrate, the mass percentage of the tobacco extract relative to the total mass of the aerosolization substrate is 0.2% to 5%, preferably 0.5% to 2%.

[0024] The preparation method of the tobacco extract of the present application, on one hand, does not have the problem of residual organic solvent, is safer for human body, and has simple process operation, which can significantly reduce production cost, and on the other hand, can obtain a tobacco extract with rich tobacco aroma, significantly reduced acid and odor, more close to traditional cigarette in taste, and excellent paste resistance. BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1 is a comparison diagram of the heater paste core condition of the electronic atomizer of the examples and the comparative examples of the present application. DETAILED DESCRIPTION

[0026] To provide a clear and consistent understanding of the terminology used in the description of the present disclosure, some definitions are provided below. In addition, unless specifically stated otherwise, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs.

[0027] Throughout the specification, unless otherwise specifically indicated, the terms used herein are to be understood in the manner as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as generally understood by one of ordinary skill in the art to which the present disclosure belongs.

[0028] It should be noted that in the embodiments of the present disclosure, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the method or device comprising a series of elements not only includes the elements explicitly listed, but also includes other elements not explicitly listed, or includes the elements inherent in the implementation of the method or device. Without more limitation, the element defined by the sentence "comprises a" does not exclude the presence of other related elements in the method or device comprising the element.

[0029] The tobacco is similar to the tobacco of Sichuan Province, the tobacco leaf is slightly thick, the leaf shape is wide and oily, the leaf edge is undulating, the leaf stalk is thick, the leaf surface is red and smooth, the oil is sufficient, the toughness is good, the fragrance is mellow, the sugar content is low, the combustion is good, the ignition is fast, the ash is white, and the quality is very good. The tobacco is obtained by natural drying of fresh tobacco leaves, and the tobacco extract obtained by conventional extraction has heavy green and miscellaneous odor, strong pungent taste and large irritation, resulting in inharmonious smoke, monotonous fragrance and insufficient fragrance, especially the unique acid odor in the smoke gives people an unpleasant feeling.

[0030] At present, different extraction and separation technologies are actively explored at home and abroad to obtain flavoring substances suitable for electronic cigarette oil from various tobaccos. The main extraction and separation technologies include solvent extraction method, supercritical extraction method, molecular distillation method, rectification method and dry distillation method, etc. Among them, the dry distillation method is a reaction process of heating and decomposing solid substances under the condition of isolating air, which has been widely studied and applied in the field of biomass energy. For example, CN109480327B discloses a preparation method of tobacco refined high-temperature dry distillation product, wherein the tobacco is dry distilled at 120-250℃, the distillate is collected, and the high-temperature dry distillation product of tobacco is obtained; the high-temperature dry distillation product is extracted with an organic solvent, and the organic phase is separated and collected. After the organic phase is concentrated and dried, the refined high-temperature dry distillation product is obtained.

[0031] CN114504119 A discloses a tobacco flavor extraction method, which adds tobacco raw materials into a water vapor distillation-dry distillation device, increases the water vapor distillation-dry distillation temperature by heating, and collects distillate at each temperature section according to the temperature; each section of distillate is extracted with a solvent, and desolventized and concentrated to obtain a tobacco flavor that can be used for flavoring new tobacco products.

[0032] However, the above prior art has certain defects, and therefore there is still a need to improve the preparation method of tobacco extract.

[0033] Therefore, the first aspect of the present disclosure provides a preparation method of a pipe tobacco extract. In the method of the present disclosure, a solvent vapor dry distillation process is used, i.e., dry distillation extraction of pipe tobacco by solvent vapor under certain heating temperature conditions, reflux components and distillate components are collected respectively, and the reflux components and distillate components are compounded in a certain proportion, so as to obtain a pipe tobacco extract with rich aroma, significantly reduced tobacco odor and excellent paste resistance. The extraction of pipe tobacco by this method does not have the problem of residual organic solvent, and the process operation is simple and the production cost is low.

[0034] Specifically, the method of the present disclosure comprises:

[0035] 1) dry distillation extraction of pipe tobacco by solvent vapor;

[0036] 2) collecting reflux components and distillate components respectively; and

[0037] 3) compounding the reflux components and distillate components in a mass ratio of 1:1 to 1:10 to obtain a pipe tobacco extract.

[0038] The method of the present application is suitable for the preparation of pipe tobacco extract. It should be understood that the method of the present disclosure can be used to prepare other tobacco extracts, such as one or more of burley tobacco extract, sun-cured tobacco extract, flue-cured tobacco extract, Oriental tobacco extract, Virginia tobacco extract, and cigar tobacco extract.

[0039] In some embodiments, the solvent used for dry distillation extraction by solvent vapor is selected from one or more of propylene glycol, glycerol, ethanol, and water. Dry distillation extraction of pipe tobacco using the vapor of the above solvents, combined with appropriate dry distillation conditions (such as temperature, time, etc.), can selectively extract specific components in pipe tobacco, while minimizing the extraction of acid odor substances such as isovaleric acid, butyric acid, fumaric acid, phenylacetic acid, and propionic acid.

[0040] In some embodiments, propylene glycol or glycerol, or a mixture of glycerol and propylene glycol is used as the solvent. It should be understood that propylene glycol and glycerol are commonly used as solvents for electronic cigarette atomization substrates, in which propylene glycol can produce a throat hit, and glycerol can be used for smoke production. When propylene glycol or glycerol, or a mixture of the two, is used as a solvent for steam distillation of tobacco shreds, the residue of other organic solvents can be avoided, and the safety for human body is higher.

[0041] In some embodiments, the tobacco shreds are subjected to distillation extraction using solvent vapor, in which the mass ratio of the tobacco shreds to the solvent used is 1:1 to 1:5, such as 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, or 1:5. In some specific embodiments, the mass ratio of the tobacco shreds to the solvent used is 1:1, 1:3, 1:4, or 1:5.

[0042] It should be understood that distillation is a pyrolysis process, which refers to a chemical change in which organic matter is heated and decomposed in the absence of oxygen or in the presence of low oxygen, producing different products such as gas, liquid, and solid. In the present disclosure, distillation is performed using solvent vapor, which means that the solvent vapor is used to drive the thermal motion of organic matter molecules, so as to promote the decomposition of the organic matter. This kind of distillation process can uniformly heat the reaction system, and ensure the uniformity and controllability of the reaction.

[0043] In some embodiments, the temperature increasing rate of the above-mentioned distillation is 5°C / min to 15°C / min, such as 5°C / min, 6°C / min, 7°C / min, 8°C / min, 9°C / min, 10°C / min, 11°C / min, 12°C / min, 13°C / min, 14°C / min, or 15°C / min. Within this temperature increasing rate range, the thermal decomposition rate of the tobacco shreds can be effectively controlled, which is helpful for more uniform pyrolysis. In a specific embodiment, the temperature increasing rate of the above-mentioned distillation is 10°C / min.

[0044] In some embodiments, the above-mentioned distillation is performed at 100°C to 400°C, such as at 100°C, 150°C, 200°C, 250°C, 300°C, 350°C, or 400°C. Performing distillation within this temperature range can achieve a high degree of cracking of macromolecular substances, and can maximize the extraction of target components, while avoiding the negative effects caused by the introduction of undesirable substances. In some specific embodiments, the above-mentioned distillation is performed at 250°C or 300°C.

[0045] In some embodiments, the dry distillation is performed for 1 h to 4 h, such as 1 h, 1.5 h, 2 h, 2.5 h, 3 h, 3.5 h, 4 h. The dry distillation is performed for a time within the above range, which can ensure that the tobacco shreds are sufficiently pyrolyzed and extracted by the steam, and more target products can be obtained, while energy can be saved, efficiency can be improved, and the generation of by-products with burnt smell can be avoided. In a specific embodiment, the dry distillation is performed for 2 h.

[0046] In some embodiments, the reflux component and the distillate component are collected separately. The reflux component, i.e., the portion that fails to be distilled, is refluxed into the dry distillation container (e.g., a flask), and is collected by one-off collection. The distillate component, i.e., the component that is evaporated at the dry distillation temperature (e.g., 100°C to 400°C) and condensed into the collection bottle by condensation.

[0047] In some embodiments, the distillate component is collected at a condensation temperature of 5°C to 10°C, such as 5°C, 6°C, 7°C, 8°C, 9°C, 10°C. In a specific embodiment, the condensation temperature is set to 5°C. By collecting the distillate component at the above condensation temperature, more target products can be collected.

[0048] In some embodiments, the reflux component and the distillate component are recombined in a mass ratio of 1:1 to 1:10, such as 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10. The reflux component and the distillate component are recombined in the above mass ratio, and the recombined product has a more coordinated overall aroma and does not introduce too much undesirable odor to affect the overall sensory experience. In some specific embodiments, the mass ratio is 1:1 to 1:3.

[0049] The present disclosure also provides a tobacco extract prepared according to the method of the first aspect of the present disclosure.

[0050] In some embodiments, the acid odor chemical component in the tobacco extract is less than 0.001 μg / g, wherein the acid odor chemical component is preferably selected from one or more of isovaleric acid, butyric acid, fumaric acid, phenylacetic acid, and propionic acid. It should be understood that, in addition to the above chemical components, the tobacco extract of the present disclosure does not contain other substances that cause acid odor, and “does not contain” herein means that the content of the corresponding substance is less than the detection limit of a GC-MS / MS (model: Agilent 5977B GC / MSD 8890GC System).

[0051] The present disclosure also provides an atomization substrate (e-cigarette oil) comprising the tobacco extract of the second aspect of the present disclosure.

[0052] In some embodiments, the mass percentage of the tobacco extract in the atomized substrate is 0.2% to 5%, preferably 0.5% to 2%, relative to the total mass of the atomized substrate.

[0053] In addition to the tobacco extract of the present application, the atomized substrate can include other additional components, such as solvents, additives.

[0054] The solvent in the atomized substrate is used to dissolve various components in the atomized substrate and generate aerosol during atomization, so that the consumer has the feeling of swallowing clouds and spitting mist. For example, the solvent is at least one selected from water, ethanol, ethylene glycol, propanol, propylene glycol, glycerol, butanol, butanediol, butanetriol, benzyl alcohol, triethyl citrate, glyceryl triacetate, and capryl capryl glycerol. The present application does not particularly limit the amount and proportion of the solvent, and any amount and proportion of the solvent commonly used in the atomized substrate can be used in the atomized substrate of the present application.

[0055] The additives in the atomized substrate can include at least one of a sweetener, a cooling agent, and an organic acid. The cooling agent and the sweetener can further provide different flavoring mouthfeel. The organic acid can further reduce the irritation to the throat and improve the satisfaction to a certain extent. The present application does not particularly limit the types of the sweetener, the cooling agent, and the organic acid, and those commonly used can be used in the atomized liquid. By way of example, the cooling agent can be WS-3, WS-5, WS-12, WS-14, WS-23, WS-25, WS-27, menthol, menthyl ether, and menthyl ester, but is not limited thereto. By way of example, the organic acid can be acetic acid, butyric acid, 2-methylbutyric acid, lactic acid, acetylpropionic acid, malic acid, tartaric acid, benzoic acid, and citric acid, but is not limited thereto. By way of example, the sweetener can be neotame, advantame, sucralose, acesulfame potassium, glucosylated steviol glycoside, aspartame, hesperidin dihydrochalcone, neohesperidin dihydrochalcone, and naringin dihydrochalcone, but is not limited thereto. The present disclosure does not particularly limit the amount of the sweetener, the cooling agent, and the organic acid.

[0056] It should be understood that the present application does not particularly limit the method for preparing the atomized substrate, which can generally include the step of mixing the components uniformly. According to some embodiments, the components can be heated and mixed, for example, at about 30°C to 50°C for 10 to 20 minutes.

[0057] The present disclosure is described in more detail by the following examples, which should be understood as being exemplary and for the purpose of explaining the present application only, and cannot be construed as limiting the present application. If no specific technique or condition is specified in the examples, the technique or condition described in the literature in the art or according to the product specification is used.

[0058] Examples

[0059] Experimental method

[0060] The method for collecting the aroma components is as follows: 500 μL of the sample is taken in a centrifuge tube, 500 μL of dichloromethane solution containing an internal standard (the internal standard is 2-methyl-3-heptanone and 2-octanol at 10.0 mg / mL) is added, oscillation (3000 rpm) is performed for 10 min for sufficient extraction, then centrifugation (10000 rpm) is performed for 5 min, an appropriate amount of the extraction liquid is passed through a 0.24 μm organic phase filter membrane, the filtrate is collected, and is transferred to a chromatographic analysis bottle for GC-MS / MS analysis.

[0061] The aroma components are determined on a GC-MS / MS (model: Agilent 5977B GC / MSD 8890GC System) with the following parameters: the chromatographic column is a DB-5MS ultra-high inert column (60 m, 0.25 mm, 0.25 μm); split injection 10:1; injection volume 1 μL; column oven temperature: 40°C for 2 min, increased to 150°C at a rate of 3°C / min, maintained for 2 min, increased to 300°C at a rate of 5°C / min, maintained for 1 min, increased to 320°C at a rate of 10°C / min, maintained for 1 min; MSD temperature 280°C; solvent delay 5.8 min; scan range: 35-550; threshold: 150; scan speed N=2; the mass spectrum is full scan; the data are compared with the NIST20 library, and each component is checked and determined.

[0062] Sensory evaluation

[0063] The sample to be tested is mixed with 59% propylene glycol and 39% glycerol in an amount of 2% relative to the total weight of the atomized substrate and 59% relative to the total weight of the atomized substrate to obtain an atomized substrate.

[0064] The atomized substrate is loaded into an electronic atomizer, 5 evaluators are used to perform sensory evaluation of smoking, and sensory evaluation is performed from the aspects of comfort, richness, irritation, smoke, and odor, etc. The sensory evaluation is mainly based on GB5606.4-2005 as the evaluation standard, and the sensory characteristics of the electronic cigarette are combined to give the sensory evaluation. The scoring standard of the sensory evaluation is shown in Table 1.

[0065] Table 1. Scoring standard of sensory evaluation

[0066] Example 1

[0067] 50 g of tobacco leaves (SKMT00016) are taken as raw materials, the tobacco leaves are cut into shreds, and are loaded into a dry distillation cylinder.

[0068] Then 200 g of propylene glycol is loaded into a round-bottom flask, the round-bottom flask and one end of the dry distillation cylinder are connected, and then a coiled condenser and an Erlenmeyer flask are connected in sequence at the other end of the dry distillation cylinder.

[0069] Into the serpentine condenser, 5℃ condensing water was introduced, the round bottom flask was heated to 300℃ at a heating rate of 10℃ / min, and the tobacco was subjected to steam dry distillation extraction at 300℃ for 2h.

[0070] Wherein, different conical flasks were used to collect the components at the initial, middle and final stages of the dry distillation, and the components flowing into the conical flask at the middle stage of the dry distillation were taken as the distilled components.

[0071] After the dry distillation was completed, the liquid flowing into the round bottom flask was taken as the reflux components.

[0072] 10g of the reflux components and 10g of the distilled components (mass ratio 1:1) were mixed, and the tobacco dry distillation extract was obtained after uniform stirring.

[0073] Comparative Example 1

[0074] 50g of tobacco leaves (SKMT00016) were taken as raw materials, the tobacco leaves were cut into shreds, 250g of 80% ethanol was added, and cold extraction was performed at 5℃; the stirring speed was 300rpm, and the stirring time was 1.5h; filtration was performed, the filtrate was collected, and the process was repeated 3 times. The 3 filtrates were combined, concentrated at 100mbar and 60℃, and the obtained concentrate was filtered through a 600-mesh sieve to obtain the tobacco alcohol extract.

[0075] Paste core test

[0076] The tobacco dry distillation extract obtained in Example 1 and the tobacco alcohol extract obtained in Comparative Example 1 were respectively added to a mixed solvent (solvent accounted for 98%) of PG:VG=6:4 at 2% to obtain electronic atomization liquid. The electronic atomization liquid was loaded into an electronic atomizer, and after 1000 puffs of simulated smoking were performed using a smoking machine, the heating body of the electronic atomizer was disassembled, and the paste core of the heating body was observed using an optical microscope; the smoking machine puffing parameters were set as 1000 puffs; the preheating time was 0.05s; the puffing time was 3s; the rest time was 15s; and the puffing capacity was 55ml. The results are shown in FIG. 1, wherein the upper graph corresponds to the tobacco alcohol extract obtained in Comparative Example 1, and the lower graph corresponds to the tobacco dry distillation extract obtained in Example 1.

[0077] As can be seen from FIG. 1, in the present application, the tobacco extract obtained by dry distillation processing has reduced paste core and carbon deposition risk compared with the tobacco extract obtained by conventional extraction process, thereby effectively improving the quality of the electronic atomization liquid product.

[0078] Analysis of aroma components

[0079] The tobacco shreds (obtained by cutting tobacco leaves (SKMT00016)) and the tobacco dry distillation extract obtained in Example 1 were analyzed using the collection method and determination method of aroma components as described above, and the obtained results are shown in Table 2.

[0080] Table 2. Comparison of tobacco shred and tobacco dry distillation aroma component data

[0081] As shown in Table 2 above, the tobacco extract prepared according to the method of the present disclosure does not contain isovaleric acid, butyric acid, fumaric acid, phenylacetic acid, propionic acid, and other substances that cause an acid odor, and thus can achieve an effect of no acid odor.

[0082] Example 2

[0083] The same procedure as in Example 1 was followed, except that 200 g of glycerol was used.

[0084] Example 3

[0085] 50 g of tobacco leaves (SKMT00016) were taken as a raw material, the tobacco leaves were shredded, and loaded into a dry distillation cylinder.

[0086] 150 g of propylene glycol was then loaded into a round-bottom flask, the round-bottom flask and one end of the dry distillation cylinder were then connected, and a coiled condenser and an Erlenmeyer flask were then connected in sequence to the other end of the dry distillation cylinder.

[0087] The coiled condenser was supplied with chilled water at 5°C, the round-bottom flask was heated to 250°C at a rate of 10°C / min, and the tobacco shred was subjected to steam dry distillation extraction at 250°C for 2 h.

[0088] Here, different Erlenmeyer flasks were used to collect the components at the initial, middle, and final stages of the dry distillation, and the components that flowed into the Erlenmeyer flask at the middle stage of the dry distillation were collected as distillate components.

[0089] After the dry distillation was completed, the liquid that flowed back into the round-bottom flask was collected, and this was the backflow components.

[0090] 5 g of the backflow components were mixed with 15 g of the distillate components (mass ratio 1:3), and stirred to obtain a tobacco dry distillation extract.

[0091] Example 4

[0092] The same procedure as in Example 3 was followed, except that 250 g of propylene glycol was used.

[0093] Example 5

[0094] The same procedure as in Example 3 was followed, except that 5 g of the backflow components were mixed with 10 g of the distillate components (mass ratio 1:2).

[0095] Example 6

[0096] The steam dry distillation extraction was performed in the same manner as in Example 5, except that the tobacco was heated at a temperature increasing rate of 10°C / min up to 300°C and maintained at 300°C for 2h.

[0097] Comparative Example 2

[0098] The same manner as in Example 4 was used, except that 14g of the reflux component was mixed with 6g of the distillate component (mass ratio 7:3).

[0099] Comparative Example 3

[0100] The same manner as in Example 4 was used, except that 12g of the reflux component was mixed with 8g of the distillate component (mass ratio 6:4).

[0101] The extracts obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were subjected to sensory evaluation, and the results are shown in Table 3.

[0102] Table 3. Sensory evaluation results of Examples 1 to 6 and Comparative Examples 1 to 3

[0103] As can be seen from Table 3 above, the extract obtained by the method of the present disclosure has a distinct tobacco characteristic, enhanced roasting aroma, significantly reduced sour odor, rich tobacco aroma, high concentration, and less oral residue, and has a good sensory evaluation.

Claims

1. A method for preparing a tobacco extract, comprising 1) dry distillation extraction of tobacco shreds by solvent vapor; 2) collecting a reflux fraction and a distillate fraction separately; and 3) compounding the reflux fraction and the distillate fraction in a mass ratio of 1:1 to 1:10 to obtain a tobacco extract.

2. The production method according to claim 1, wherein The solvent is selected from one or more of propylene glycol, glycerol, ethanol, water.

3. The production method according to claim 1 or 2, wherein, The mass ratio of the tobacco shreds to the solvent is 1:1 to 1:5, preferably 1:3 to 1:

5.

4. The production method according to any one of claims 1 to 3, wherein, The dry distillation is performed at a temperature of 100°C to 400°C, preferably 250°C to 300°C.

5. The production method according to any one of claims 1 to 4, wherein, The reflux fraction and the distillate fraction are compounded in a mass ratio of 1:1 to 1:

3.

6. The production process according to any one of claims 1 to 5, wherein, The method comprises one or more of the following features: The temperature increase rate of the dry distillation is 5°C / min to 15°C / min; The duration of the dry distillation is 1h to 4h; The distillate fraction is collected at a condensation temperature of 5°C to 10°C.

7. A smokeless tobacco extract, wherein, The tobacco extract is prepared according to the method of any one of claims 1 to 6.

8. The smoke extract according to claim 7, wherein, The acid and pungent chemical components in the tobacco extract are all below 0.001 μg / g, wherein preferably the acid and pungent chemical components are selected from one or more of isovaleric acid, butyric acid, fumaric acid, phenylacetic acid, propionic acid.

9. An aerosolized substrate comprising the tobacco extract of claim 7 or 8.

10. The aerosolizing substrate of claim 9 wherein, The mass percentage of the tobacco extract relative to the total mass of the aerosolized substrate is 0.2% to 5%, preferably 0.5% to 2%.

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