Preparation method of tobacco extract used in atomized liquid

Abstract

The invention belongs to the technical field of atomized liquid component design, and particularly relates to a preparation method of a tobacco extract used in atomized liquid, which comprises the following steps: extracting tobacco volatile components from tobacco extract by adopting a simultaneous distillation extraction method, extracting the extracted tobacco extract to obtain tobacco absolute, and carrying out molecular distillation on the tobacco absolute to obtain the tobacco extract. The distillation product is a light-component flavor substance, the remaining after distillation is a heavy-component flavor substance, separating the heavy-component flavor substance through resin column chromatography, collecting to obtain a tobacco bonded flavor component, and uniformly mixing the tobacco volatile component, the light-component flavor substance and the tobacco bonded flavor component which are respectively obtained to obtain the tobacco extract.

Description

Technical Field

[0001] The invention belongs to the technical field of atomizing liquid component design, and particularly relates to a method for preparing a tobacco extract used in atomizing liquid. Background Art

[0002] Tobacco extract is the key substance that determines the tobacco flavor of electronic atomization liquid products, and directly determines the basic quality of tobacco-flavored electronic atomization liquid products. The ingredients and composition of tobacco extract are the key factors in the taste and quality stability of tobacco-flavored electronic atomization liquid products.

[0003] Tobacco extracts on the market, such as tobacco extract, are tobacco flavors, mainly used in cigarettes, with weak aroma, bland fragrance, and poor flavoring effect. Direct application in electronic atomization liquid will produce obvious "burnt smell" problems, affecting the smoking experience of electronic atomization liquid. The main reason for these problems is that commercially available tobacco extracts contain a large amount of macromolecular high-boiling point substances such as sugars and proteins, as well as waxy components such as long-chain fatty hydrocarbons. These macromolecular substances are generally less volatile and cannot be smoothly atomized when the electronic atomization liquid is heated. They are deposited on the heater to produce a burnt smell, which seriously affects the smoking quality.

[0004] Although there are many methods of using synthetic flavors instead of natural flavors, there are thousands of substances that produce tobacco flavor. Not only are there many components, but the various components also affect each other. This complex situation makes the research on tobacco and extract flavoring substances difficult, and it is completely impossible to describe them with a single chemical component. Therefore, the fragrance blended with synthetic flavors is difficult to achieve the aroma of tobacco, the degree of restoration is poor, and it is difficult to have the tobacco smoking experience after the electronic atomization liquid is atomized. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for preparing a tobacco extract for use in an atomized liquid, comprising the following steps:

[0006] (1) Extraction of tobacco volatile components

[0007] The simultaneous distillation extraction method is adopted, the steam generated by the distillation of tobacco extract after adding water to disperse the tobacco extract, and the steam generated by the distillation of the extraction solvent is mixed and condensed, the organic phase is taken for low-temperature vacuum concentration, and propylene glycol or glycerin is added and mixed to obtain tobacco volatile components;

[0008] (2) Extraction of tobacco oil

[0009] After low-temperature vacuum concentration of the tobacco extract dispersion system remaining after heating and distillation in step (1), ethanol is added thereto for extraction and stratification, and the upper liquid phase is retained and low-temperature vacuum concentration is performed to obtain tobacco oil;

[0010] (3) Separation of tobacco oil

[0011] The tobacco pure oil obtained in step (2) is molecularly distilled, and the distillation product is the light component aroma substance, and the remaining after distillation is the heavy component aroma substance;

[0012] (4) Extraction of bound aroma components from tobacco

[0013] The recombinant aroma substance obtained in step (3) is dispersed in water and then filtered. After the filtrate is separated by resin column chromatography, the resin is eluted with water, low-concentration ethanol and high-concentration ethanol respectively, and the high-concentration ethanol eluate is collected, concentrated, and then propylene glycol or glycerol is added and mixed to obtain tobacco-bound aroma components;

[0014] (5) The tobacco volatile components obtained in step (1), the light component aroma substances obtained in step (3), and the tobacco bonded aroma components obtained in step (4) are uniformly mixed to obtain a tobacco extract.

[0015] Preferably, the tobacco extract in step (1) is one or a combination of Virginia tobacco extract, Zimbabwe tobacco extract, Yunnan tobacco extract, Henan tobacco extract, burley tobacco extract, air-dried yellow tobacco extract, and sun-dried red tobacco extract.

[0016] Preferably, in step (1), the tobacco extract is added with water and dispersed sufficiently according to a mass ratio of tobacco extract to water of 1:1 to 20.

[0017] Preferably, in step (1), the extraction solvent is petroleum ether or n-hexane, and the amount of the extraction solvent is 1 to 10 times the mass of the tobacco extract.

[0018] Preferably, in step (3), the treatment conditions of molecular distillation are as follows: heating temperature of 50-70°C, evaporation temperature of 80-150°C, condensation temperature of the first stage of 10°C-40°C, condensation temperature of the second stage of 10°C--10°C, condensation temperature of the third stage of -10°C--30°C, rotation speed of 100-300 r / min, vacuum degree of 10-200 Pa, and flow rate of 0.5-3 ml / min.

[0019] Preferably, in step (4), the recombinant aroma substance is added with water and dispersed sufficiently according to a mass ratio of the recombinant aroma substance to water of 1:1 to 20.

[0020] Preferably, in step (4), the resin used for column chromatography is one or a combination of XAD-2, XAD-4, AB-4, D101.

[0021] Preferably, in step (4), the low-concentration ethanol is an ethanol aqueous solution with a volume fraction of 40%, and the high-concentration ethanol is an ethanol aqueous solution with a volume fraction of 95%.

[0022] Preferably, in step (5), the mixture is mixed evenly and then filtered through a 0.45 μm filter membrane.

[0023] The beneficial effects of the present application are as follows: in each operation step, the present scheme extracts the tobacco volatile components by distillation according to the difference in boiling points between the components; extracts the tobacco pure oil according to the difference in solubility between the components, and at the same time, can also separate the macromolecular substances such as polysaccharides and proteins as much as possible; obtains the light component aroma substances by molecular distillation according to the difference in molecular free path between the components; and removes the "carbon deposition" substances caused by monosaccharides such as glucose and fructose in the heavy component aroma substances by column chromatography according to the difference in intermolecular forces and polarity between the components, and collects the bonded aroma substances that can be cleaved, and finally mixes the obtained components to achieve the enrichment of the aroma substances in tobacco. Although the tobacco components have changed significantly after a series of treatments of this scheme, the aroma effect is not only not affected, but also significantly improved. Applied to the electronic cigarette atomizer, it solves the problems of poor solubility of conventional tobacco extracts in the atomizer, serious "carbon deposition", and weak tobacco aroma. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a process flow chart of this application. DETAILED DESCRIPTION

[0025] A method for preparing a tobacco extract for use in an atomized liquid comprises the following steps:

[0026] (1) Extraction of tobacco volatile components

[0027] The simultaneous distillation extraction method is adopted. The steam generated by the distillation of tobacco extract after adding water to disperse the extract is mixed with the steam generated by the distillation of the extraction solvent and condensed. The organic phase is concentrated in low temperature vacuum, and propylene glycol or glycerol is added to mix to obtain tobacco volatile components (the target product is small in amount, and it is attached to the container wall after being fully concentrated, and is directly dispersed by adding solvent).

[0028] The tobacco extract is one or a combination of Virginia tobacco extract, Zimbabwe tobacco extract, Yunyan extract, Henan tobacco extract, Burley tobacco extract, air-dried yellow tobacco extract, and sun-dried red tobacco extract.

[0029] According to the mass ratio of tobacco extract to water of 1:1-20, add water to the tobacco extract and disperse it fully, then heat and distill it. The heating and distillation temperature of the tobacco extract is 100℃-120℃.

[0030] The extraction solvent is petroleum ether or n-hexane, the amount of the extraction solvent is 1 to 10 times the mass of the tobacco extract, and the heating distillation temperature of the extraction solvent is 50°C to 80°C.

[0031] The distillation extraction time is 1 to 5 hours.

[0032] Low temperature vacuum concentration temperature is 40℃~70℃;

[0033] (2) Extraction of tobacco oil

[0034] After the tobacco extract dispersion system left after the heating and distillation in step (1) is subjected to low-temperature vacuum concentration, ethanol is added thereto for extraction and stratification, and the upper liquid phase is retained and subjected to low-temperature vacuum concentration to obtain tobacco oil.

[0035] Among them, the low-temperature vacuum concentration temperature of the tobacco extract dispersion system is 60℃~80℃.

[0036] The low temperature vacuum concentration temperature of the upper layer liquid after extraction is 40℃~70℃;

[0037] (3) Separation of tobacco oil

[0038] The tobacco pure oil obtained in step (2) is molecularly distilled, and the distillation product is the light component aroma substance, and the remaining after distillation is the heavy component aroma substance.

[0039] The processing conditions of molecular distillation are as follows: heating temperature 50-70°C, evaporation temperature 80-150°C, condensation temperature of the first stage 10°C-40°C, condensation temperature of the second stage 10°C--10°C, condensation temperature of the third stage -10°C--30°C, rotation speed 100-300r / min, vacuum degree 10-200Pa, flow rate 0.5-3ml / min;

[0040] (4) Extraction of bound aroma components from tobacco

[0041] The recombinant aroma substance obtained in step (3) is dispersed in water and filtered. After the filtrate is separated by resin column chromatography, the resin is eluted with water, low-concentration ethanol and high-concentration ethanol respectively. The high-concentration ethanol eluate is collected, concentrated, and then propylene glycol or glycerol is added and mixed to obtain tobacco bonded aroma components (the target product is small in amount, and is attached to the container wall after being fully concentrated, and is directly dispersed by adding a solvent).

[0042] Wherein, the mass ratio of the heavy component flavor material to water is 1:1-20, the heavy component flavor material is added with water and fully dispersed,

[0043] The resin used in column chromatography is one or a combination of XAD-2, XAD-4, AB-4, D101.

[0044] The low-concentration ethanol is an ethanol aqueous solution with a volume fraction of 40%, and the high-concentration ethanol is an ethanol aqueous solution with a volume fraction of 95%;

[0045] (5) The tobacco volatile components obtained in step (1), the light component aroma substances obtained in step (3), and the tobacco bonded aroma components obtained in step (4) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0046] Example 1

[0047] (1) Extraction of tobacco volatile components

[0048] Using a simultaneous distillation extraction method, 300g of Yunyan extract was dispersed in 3L of water and then heated and distilled at 100°C to generate steam, which was mixed with the steam generated by heating and distilling 1.5L of petroleum ether at 80°C and condensed, and the organic phase was concentrated at 70°C in a vacuum, and propylene glycol was added and mixed to obtain about 10g of tobacco volatile components;

[0049] (2) Extraction of tobacco oil

[0050] After the Yunyan extract dispersion system left after the heating distillation in step (1) is concentrated at 80°C in vacuum, a sufficient amount of 95% ethanol aqueous solution is added thereto for extraction and stratification, and the upper liquid phase is retained and concentrated at 60°C in vacuum to obtain about 150g of tobacco oil;

[0051] (3) Separation of tobacco oil

[0052] The tobacco pure oil obtained in step (2) is molecularly distilled, and the treatment conditions of the molecular distillation are as follows: heating temperature 60°C, evaporation temperature 100°C, condensation temperature of the first stage 20°C, condensation temperature of the second stage -10°C, condensation temperature of the third stage -30°C, rotation speed 200r / min, vacuum degree 50Pa, flow rate 2ml / min,

[0053] The distillation product is about 75g of light-component aroma substances, and the remaining after distillation is about 50g of heavy-component aroma substances;

[0054] (4) Extraction of bound aroma components from tobacco

[0055] The recombinant aroma substance obtained in step (3) is dispersed in 0.5 L of water and filtered. The filtrate is separated by XDA-4 resin column chromatography, and the resin is eluted with water, 40% by volume ethanol aqueous solution and 95% by volume ethanol aqueous solution respectively. The 95% by volume ethanol aqueous solution eluate is collected, concentrated, and then propylene glycol is added and mixed to obtain about 15 g of tobacco bonded aroma components;

[0056] (5) The tobacco volatile components obtained in step (1), the light component aroma substances obtained in step (3), and the tobacco bonded aroma components obtained in step (4) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0057] Example 2

[0058] (1) Extraction of tobacco volatile components

[0059] A simultaneous distillation extraction method was used to disperse 300 g of Zimbabwean tobacco pure paste in 6 L of water and then heat and distill at 120° C. to generate steam, which was mixed with steam generated by heating and distilling 3 L of petroleum ether at 70° C. and condensed. The organic phase was concentrated at 40° C. in a vacuum, and then propylene glycol was added and mixed to obtain tobacco volatile components.

[0060] (2) Extraction of tobacco oil

[0061] After the Zimbabwe tobacco pure oil dispersion system left after the heating and distillation in step (1) is concentrated at 60° C. in a vacuum, a sufficient amount of 95% ethanol aqueous solution is added thereto for extraction and stratification, and the upper liquid phase is retained and concentrated at 70° C. in a vacuum to obtain tobacco pure oil;

[0062] (3) Separation of tobacco oil

[0063] The tobacco pure oil obtained in step (2) is molecularly distilled, and the treatment conditions of the molecular distillation are as follows: a heating temperature of 70° C., an evaporation temperature of 150° C., a condensation temperature of 40° C. in the first stage, a condensation temperature of 10° C. in the second stage, a condensation temperature of -10° C. in the third stage, a rotation speed of 300 r / min, a vacuum degree of 200 Pa, and a flow rate of 3 ml / min.

[0064] The distillation product is the light component aroma substance, and what is left after distillation is the heavy component aroma substance;

[0065] (4) Extraction of bound aroma components from tobacco

[0066] The recombinant aroma substance obtained in step (3) is dispersed in 0.5 L of water and then filtered. After the filtrate is separated by XAD-2 resin column chromatography, the resin is eluted with water, 40% by volume ethanol aqueous solution and 95% by volume ethanol aqueous solution respectively, and the 95% by volume ethanol aqueous solution eluate is collected, concentrated, and then propylene glycol is added and mixed to obtain tobacco bonded aroma components;

[0067] (5) The tobacco volatile components obtained in step (1), the light component aroma substances obtained in step (3), and the tobacco bonded aroma components obtained in step (4) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0068] Example 3

[0069] (1) Extraction of tobacco volatile components

[0070] A simultaneous distillation extraction method was used, wherein 300 g of sun-cured red tobacco extract was dispersed with 0.5 L of water and then heated and distilled at 110° C. to generate steam, which was mixed with steam generated by heating and distilling 0.5 L of n-hexane at 70° C. and condensed, and the organic phase was concentrated at 60° C. in a vacuum, and then propylene glycol was added and mixed to obtain tobacco volatile components;

[0071] (2) Extraction of tobacco oil

[0072] After the sun-cured red tobacco extract dispersion system left after the heating distillation in step (1) is concentrated at 70° C. in a vacuum, a sufficient amount of 95% ethanol aqueous solution is added thereto for extraction and stratification, and the upper liquid phase is retained and concentrated at 40° C. in a vacuum to obtain tobacco oil;

[0073] (3) Separation of tobacco oil

[0074] The tobacco pure oil obtained in step (2) is molecularly distilled, and the treatment conditions of the molecular distillation are as follows: heating temperature of 50°C, evaporation temperature of 115°C, condensation temperature of the first stage of 10°C, condensation temperature of the second stage of 0°C, condensation temperature of the third stage of -20°C, rotation speed of 100r / min, vacuum degree of 10Pa, flow rate of 0.5ml / min,

[0075] The distillation product is the light component aroma substance, and what is left after distillation is the heavy component aroma substance;

[0076] (4) Extraction of bound aroma components from tobacco

[0077] The recombinant aroma substance obtained in step (3) is dispersed in 0.5 L of water and filtered. After the filtrate is separated by D101 resin column chromatography, the resin is eluted with water, 40% by volume ethanol aqueous solution and 95% by volume ethanol aqueous solution respectively, and the 95% by volume ethanol aqueous solution eluate is collected, concentrated, and then propylene glycol is added and mixed to obtain tobacco bonded aroma components;

[0078] (5) The tobacco volatile components obtained in step (1), the light component aroma substances obtained in step (3), and the tobacco bonded aroma components obtained in step (4) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0079] Comparative Example 1

[0080] The tobacco volatile components were not extracted, and the remaining operations were the same as in Example 1:

[0081] (1) Extraction of tobacco oil

[0082] Add sufficient volume fraction 95% ethanol aqueous solution to 300g of Yunyan extract for extraction and stratification, retain the upper liquid phase and vacuum concentrate at 60°C to obtain tobacco oil;

[0083] (2) Separation of tobacco oil

[0084] The tobacco pure oil obtained in step (1) is molecularly distilled, and the treatment conditions of the molecular distillation are as follows: heating temperature 60°C, evaporation temperature 100°C, condensation temperature of the first stage 20°C, condensation temperature of the second stage -10°C, condensation temperature of the third stage -30°C, rotation speed 200r / min, vacuum degree 50Pa, flow rate 2ml / min,

[0085] The distillation product is the light component aroma substance, and what is left after distillation is the heavy component aroma substance;

[0086] (3) Extraction of tobacco bound aroma components

[0087] The recombinant aroma substance obtained in step (2) is dispersed in 10 times the weight of water and then filtered. After the filtrate is separated by XDA-4 resin column chromatography, the resin is eluted with water, 40% by volume ethanol aqueous solution and 95% by volume ethanol aqueous solution respectively, and the 95% by volume ethanol aqueous solution eluate is collected, concentrated, and then propylene glycol is added and mixed to obtain tobacco bonded aroma components;

[0088] (4) The light component aroma substances obtained in step (2) and the tobacco bonded aroma components obtained in step (3) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0089] Comparative Example 2

[0090] The light component aroma substances were not extracted, and the remaining operations were the same as in Example 1:

[0091] (1) Extraction of tobacco volatile components

[0092] Using a simultaneous distillation extraction method, 300g of Yunyan extract was dispersed in 3L of water and then heated and distilled at 100°C to generate steam, which was mixed with the steam generated by heating and distilling 1.5L of petroleum ether at 80°C and condensed, and the organic phase was concentrated at 70°C in a vacuum, and propylene glycol was added and mixed to obtain about 10g of tobacco volatile components;

[0093] (2) Extraction of tobacco oil

[0094] After the Yunyan extract dispersion system left after the heating distillation in step (1) is concentrated at 80°C in vacuum, a sufficient amount of 95% ethanol aqueous solution is added thereto for extraction and stratification, and the upper liquid phase is retained and concentrated at 60°C in vacuum to obtain about 150g of tobacco oil;

[0095] (3) Extraction of tobacco bound aroma components

[0096] The tobacco pure oil obtained in step (2) is dispersed in 10 times the weight of water and then filtered. After the filtrate is separated by XDA-4 resin column chromatography, the resin is eluted with water, 40% by volume ethanol aqueous solution and 95% by volume ethanol aqueous solution respectively, and the 95% by volume ethanol aqueous solution eluate is collected, concentrated, and then propylene glycol is added and mixed to obtain tobacco bonded flavor components;

[0097] (4) The tobacco volatile components obtained in step (1) and the tobacco bound flavor components obtained in step (3) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0098] Comparative Example 3

[0099] The tobacco bonded flavor components were not extracted, and the remaining operations were the same as in Example 1:

[0100] (1) Extraction of tobacco volatile components

[0101] Using a simultaneous distillation extraction method, 300g of Yunyan extract was dispersed in 3L of water and then heated and distilled at 100°C to generate steam, which was mixed with the steam generated by heating and distilling 1.5L of petroleum ether at 80°C and condensed, and the organic phase was concentrated at 70°C in a vacuum, and propylene glycol was added and mixed to obtain about 10g of tobacco volatile components;

[0102] (2) Extraction of tobacco oil

[0103] After the Yunyan extract dispersion system left after the heating distillation in step (1) is concentrated at 80°C in vacuum, a sufficient amount of 95% ethanol aqueous solution is added thereto for extraction and stratification, and the upper liquid phase is retained and concentrated at 60°C in vacuum to obtain about 150g of tobacco oil;

[0104] (3) Separation of tobacco oil

[0105] The tobacco pure oil obtained in step (2) is molecularly distilled, and the treatment conditions of the molecular distillation are as follows: heating temperature 60°C, evaporation temperature 100°C, condensation temperature of the first stage 20°C, condensation temperature of the second stage -10°C, condensation temperature of the third stage -30°C, rotation speed 200r / min, vacuum degree 50Pa, flow rate 2ml / min,

[0106] The distillation product is about 75g of light-component aroma substances, and the remaining after distillation is about 50g of heavy-component aroma substances;

[0107] (4) The tobacco volatile components obtained in step (1), the light component aroma substances and the heavy component aroma substances obtained in step (3) are mixed evenly, and filtered through a 0.45 μm filter membrane to obtain a tobacco extract.

[0108] Comparative Example 4

[0109] The Yunyan extract in Example 1 was not processed.

[0110] The tobacco extracts (or Yunyan extract) obtained in the above-mentioned embodiments and comparative embodiments were respectively made into atomized liquids. The preparation methods of the atomized liquids were all as follows: weigh the tobacco extracts (or Yunyan extracts), add them into a mixed solvent of PG:VG=1:1 (mass ratio), mix them evenly to form atomized liquids, and the mass fraction of tobacco extracts (or Yunyan extracts) in the atomized liquids was 40%. Then, an atomizer containing a ceramic atomization core was used to perform an atomization evaluation test, and the results are shown in the following table:

[0111] Carbonization Tobacco flavor evaluation Example 1 Not easy to carbonize Full and rich tobacco flavor Example 2 Not easy to carbonize Full and rich tobacco flavor Example 3 Not easy to carbonize Full and rich tobacco flavor Comparative Example 1 Not easy to carbonize The tobacco flavor is not good when you take it, and the aroma is insufficient Comparative Example 2 Not easy to carbonize The tobacco aroma is insufficient and has mixed smell Comparative Example 3 Carbonization occurs The tobacco flavor is not full and the layering is missing Comparative Example 4 Easy to carbonize Burnt core, with a burnt smell

[0112] In the above table, in Examples 1 to Comparative Examples 3, Yunyan extract was extracted and separated to varying degrees, but from the perspective of aroma enrichment, only Examples 1 to 3 stimulated the tobacco aroma well. This further verifies that: Examples 1 to 3 remove components that are prone to gelatinization, avoiding the impact or shielding of taste and aroma; more importantly, as introduced in the background technology, there are thousands of substances that produce tobacco aroma, not only are there many components, but the various components also affect each other, resulting in a very complex mechanism in this regard. After a series of extraction and separation operations in this scheme, some components in the tobacco are retained, and some components are largely removed, but this change does not affect the existing components from jointly producing tobacco aroma, indicating that the components selected to be retained during extraction in this scheme and the synergistic effects between the components have a close impact on the tobacco aroma.

[0113] For example, after the process flow in Comparative Examples 1 to 3 is changed, even if only one of the operation links is missing, although this only results in only a partial difference in the components after extraction from Example 1 (for example, in Comparative Example 1, the proportion of tobacco volatile components that have not been collected and preserved in advance is at most less than 10% of the extract finally enriched together), the aroma effect will also be significantly damaged. It can be seen that in addition to the lack or reduction of the corresponding component, it must also involve the loss or decline of the synergistic effect between the component and other components.

[0114] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a tobacco extract for use in an atomized liquid, characterized in that: The preparation method is: (1) Extraction of tobacco volatile components The simultaneous distillation extraction method is adopted, the steam generated by the distillation of tobacco extract after adding water to disperse the tobacco extract, and the steam generated by the distillation of the extraction solvent is mixed and condensed, the organic phase is taken for low-temperature vacuum concentration, and propylene glycol or glycerin is added and mixed to obtain tobacco volatile components; (2) Extraction of tobacco oil After low-temperature vacuum concentration of the tobacco extract dispersion system remaining after heating and distillation in step (1), ethanol is added thereto for extraction and stratification, and the upper liquid phase is retained and low-temperature vacuum concentration is performed to obtain tobacco oil; (3) Separation of tobacco oil The tobacco pure oil obtained in step (2) is molecularly distilled, and the distillation product is the light component aroma substance, and the remaining after distillation is the heavy component aroma substance; (4) Extraction of tobacco bound aroma components The recombinant aroma substance obtained in step (3) is dispersed in water and then filtered. After the filtrate is separated by resin column chromatography, the resin is eluted with water, low-concentration ethanol and high-concentration ethanol respectively, and the high-concentration ethanol eluate is collected, concentrated, and then propylene glycol or glycerol is added and mixed to obtain tobacco-bound aroma components; (5) The tobacco volatile components obtained in step (1), the light component aroma substances obtained in step (3), and the tobacco bonded aroma components obtained in step (4) are uniformly mixed to obtain a tobacco extract.

2. The method for preparing the tobacco extract for atomization liquid according to claim 1, characterized in that: The tobacco extract in step (1) is one of Virginia tobacco extract, Zimbabwe tobacco extract, Yunnan tobacco extract, Henan tobacco extract, burley tobacco extract, air-dried yellow tobacco extract, and sun-dried red tobacco extract, or a combination of several of them.

3. The method for preparing the tobacco extract for atomized liquid according to claim 1, characterized in that: In step (1), water is added to the tobacco extract and the tobacco extract is fully dispersed according to a mass ratio of the tobacco extract to water of 1:1 to 20.

4. The method for preparing the tobacco extract for atomized liquid according to claim 1, characterized in that: In step (1), the extraction solvent is petroleum ether or n-hexane, and the amount of the extraction solvent is 1 to 10 times the mass of the tobacco extract.

5. The method for preparing the tobacco extract for atomization liquid according to claim 1, characterized in that: In step (3), the treatment conditions of molecular distillation are as follows: heating temperature of 50-70°C, evaporation temperature of 80-150°C, condensation temperature of the first stage of 10°C-40°C, condensation temperature of the second stage of 10°C--10°C, condensation temperature of the third stage of -10°C--30°C, rotation speed of 100-300r / min, vacuum degree of 10-200Pa, and flow rate of 0.5-3ml / min.

6. The method for preparing the tobacco extract for atomized liquid according to claim 1, characterized in that: In step (4), the recombinant aroma substance is added with water and fully dispersed according to the mass ratio of the recombinant aroma substance to water being 1:1 to 20.

7. The method for preparing the tobacco extract for atomized liquid according to claim 1, characterized in that: In step (4), the resin used for column chromatography is one or a combination of XAD-2, XAD-4, AB-4, D101.

8. The method for preparing the tobacco extract for atomized liquid according to claim 1, characterized in that: In step (4), the low-concentration ethanol is an ethanol aqueous solution with a volume fraction of 40%, and the high-concentration ethanol is an ethanol aqueous solution with a volume fraction of 95%.

9. The method for preparing a tobacco extract for atomized liquid according to claim 1, characterized in that: In step (5), the mixture is mixed evenly and then filtered through a 0.45 μm filter membrane.

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