CN116264909A - Method for preparing tobacco pyrolysis product based on dialysis principle, tobacco pyrolysis product and application - Google Patents

Abstract

The invention discloses a method for preparing a tobacco pyrolysis product based on a dialysis principle, the tobacco pyrolysis product and application. The preparation method of the tobacco pyrolysis product comprises the following steps: grinding the tobacco raw materials to obtain tobacco powder; extracting tobacco powder by a solvent to obtain tobacco extract; dialyzing the tobacco extract to obtain impurity-removed tobacco extract; and carrying out pyrolysis treatment on the impurity-removed tobacco extract to obtain a pyrolysis product. The method can directionally remove substances with negative influence on smoking quality such as protein, polysaccharide, etc. in the extract by dialysis technique, and enrich micromolecules and volatile components with important organoleptic characteristics, thereby being beneficial to stability of tobacco extract quality.

Description

Method for preparing tobacco pyrolysis product based on dialysis principle, tobacco pyrolysis product and application

Technical Field

The invention relates to a tobacco pyrolysis product, a preparation method and application thereof, in particular to a method for preparing the tobacco pyrolysis product based on a dialysis principle, and also relates to the tobacco pyrolysis product prepared by the method and application thereof in heating non-combustible tobacco products, belonging to the technical field of novel tobacco products.

Background

According to the European Rui international estimated data, in 2020, cigarettes 5528 ten thousand are sold in other markets except China worldwide, and the cigarettes are reduced by 5.2% in the last year, so that the maximum reduction is created in the last five years. From sales, global markets except China realize 196.2 hundred million dollars sales, 4.3% increase over the last year; the heated cigarettes realize a sales of 177.8 hundred million dollars, 15.8% increase over the last year. Worldwide, heating cigarettes has become a major rising driver of tobacco sales.

The cigarette has three temperature ranges from 900 ℃ near the carbon line to 50 ℃ near the filter tip section in the burning and sucking process, namely a high-temperature combustion area, a pyrolysis distillation area and a condensation area. Compared with the existing cigarettes, the novel tobacco product has smaller fluctuation of heating temperature, and the richness of the cracked or volatilized aroma substances is obviously insufficient at the same temperature. At present, most of the mainstream heating cigarette products in the market are of tobacco taste, however, the novel tobacco products still have the defects of insufficient tobacco fragrance and the like, and have larger sensory quality difference with cigarettes when in burning and smoking. In addition, the presence of macromolecular substances such as proteins and the like in tobacco extracts that have a negative effect on sensory quality, the targeted removal of such macromolecular substances has an important role in improving the smoking quality of heated cigarettes. At present, a membrane separation technology is mainly adopted in a separation means, however, in the industrial production process, the membrane blockage phenomenon often occurs in the membrane separation technology, and the production progress is seriously influenced.

Based on the method, the tobacco leaf extract of Henan Zhongyan Chen Zeshao and the like (invention patent publication No. CN 110236232A) is added with Maillard reactants for microwave pyrolysis, organic solvent is adopted for extracting pyrolysis oil, and the pyrolysis oil is added into electronic cigarette liquid after rotary evaporation, so that the method can obviously enhance the aroma quality of the electronic cigarette and the baking smell of the electronic cigarette; however, there is a possibility that the tobacco leaf extract contains a large amount of substances which have negative effects on sensory quality, such as soluble proteins, polysaccharides and the like; in addition, zheng Jianyu and other publications, macromolecular substances which have negative effects on sensory quality in the tobacco extract can be effectively removed by adopting an ultrafiltration membrane technology, and the dependence degree of the tobacco extract on tobacco raw materials can be reduced by adopting a separation and enrichment technology, so that the quality stability is improved.

Disclosure of Invention

Aiming at the defects of the prior art, the first aim of the invention is to provide a tobacco pyrolysis product which is used for heating novel tobacco products of non-combustible cigarettes, can obviously enhance the smoking fragrance of the tobacco products and enhance the richness of smoke, thereby realizing more realistic smoking experience of cigarettes and having better practical value.

The second object of the invention is to provide a method for preparing tobacco pyrolysis products based on the dialysis principle, which can directionally remove macromolecular substances which have negative effects on sensory quality in tobacco in the process of preparing tobacco extract by adopting the dialysis technology, and can obtain the tobacco pyrolysis products by controlling the molecular weight of the extract and the pyrolysis temperature, thereby enhancing the tobacco fragrance of novel tobacco products, separating and enriching aroma components and reducing the quality fluctuation influence of tobacco raw materials on tobacco extracts.

The third object of the invention is to provide an application of a tobacco pyrolysis product, wherein the tobacco pyrolysis product is used for heating a novel non-combustible cigarette tobacco product, can obviously enhance the smoke aroma of the tobacco product and enhance the richness of smoke, thereby more realistically realizing the smoking feeling of the cigarette and having better practical value.

To achieve the above technical object, the present invention provides a method for preparing a tobacco pyrolysis product based on a dialysis principle, comprising the steps of:

1) Grinding the tobacco raw materials to obtain tobacco powder;

2) Extracting tobacco powder by a solvent to obtain tobacco extract;

3) Dialyzing the tobacco extract to obtain impurity-removed tobacco extract;

4) And carrying out pyrolysis treatment on the impurity-removed tobacco extract to obtain a tobacco pyrolysis product.

The key of the technical scheme of the invention is that the tobacco extract is subjected to dialysis treatment, and a dialysis bag with a proper aperture can be selected according to different tobacco raw materials and macromolecular substances which are contained in the tobacco raw materials and have negative influence on sensory quality in the dialysis treatment process, so that the macromolecular substances can be effectively removed.

As a preferred embodiment, the tobacco material includes at least one of flue-cured tobacco, burley tobacco, aromatic tobacco, cigar tobacco, sun-cured tobacco, tobacco flowers, and tobacco stalks. The common tobacco raw materials in the prior art are all suitable for the technical scheme of the invention.

As a preferred embodiment, the tobacco raw material is ground to 100 to 300 mesh. Grinding the tobacco material to a suitable particle size facilitates efficient extraction of the useful components in the tobacco material.

As a preferred scheme, the solvent extraction process is as follows: and (3) placing the tobacco powder in a solvent for heating reflux extraction, recovering the solvent from the obtained extracting solution through reduced pressure distillation, and then performing freeze drying to obtain the tobacco extract.

As a preferable scheme, the solid-to-liquid ratio of the tobacco powder to the solvent is 1 g:2-10 mL, and the reflux temperature is 70-90 ℃.

As a preferable scheme, the solvent is at least one of ethanol, water, petroleum ether and ethyl acetate;

as a preferable embodiment, the reduced pressure distillation temperature is 40 to 65 ℃.

As a preferable scheme, the molecular weight cut-off of the dialysis bag adopted in the dialysis treatment process is 0.3 KD-30 KD. As can be seen from Table 1, the contents of the main components of the tobacco extract obtained by interception by dialysis bags with different molecular weight cut-off are completely different, and the molecular weight cut-off of the dialysis bag is more preferably 20 KD-10 KD by comprehensively considering the contents of useful components and unfavorable impurities contained in the tobacco extract and the contents of useful components in pyrolysis products.

As a preferable scheme, the dialysate adopted in the dialysis treatment process is ethanol water solution with the mass percent concentration of 5-25%, the dialysis times are 2-4 times, the dialysis time is 5-7 h each time, and the mass volume ratio of the tobacco extract to the dialysate is 1 g:50-100 mL.

As a preferable scheme, the microwave heating pyrolysis mode is adopted, and the pyrolysis temperature is controlled within a temperature range of 200-1000 ℃ in the pyrolysis treatment process.

As a more preferable scheme, the impurity-removed tobacco extract is pyrolyzed at any temperature in a temperature range of 200-1000 ℃ in the pyrolysis treatment process to obtain a tobacco pyrolysis product, or the impurity-removed tobacco extract is pyrolyzed at any two or more temperature ranges of 200-350 ℃, more than 350 ℃ and less than or equal to 450 ℃, more than 450 ℃ and less than or equal to 550 ℃, more than 550 ℃ and less than or equal to 650 ℃, more than 650 ℃ and less than or equal to 750 ℃, more than 750 ℃ and less than or equal to 850 ℃ or more than 850 ℃ and less than or equal to 1000 ℃ to obtain the tobacco pyrolysis product. Further preferably, the impurity-removed tobacco extract is pyrolyzed in the temperature regions of 200 ℃ -350 ℃, more than 350 ℃ and less than or equal to 450 ℃, morethan 450 ℃ and less than or equal to 550 ℃, morethan 550 ℃ and less than or equal to 650 ℃, morethan 650 ℃ and less than or equal to 750 ℃, morethan 750 ℃ and less than or equal to 850 ℃ or more than 850 ℃ and less than or equal to 1000 ℃, and the pyrolysis products obtained in any three or four temperature regions are mixed to obtain the tobacco pyrolysis product. Still more preferably, the impurity-removed tobacco extract is divided into a plurality of parts, pyrolysis is carried out in temperature areas of 200 ℃ -350 ℃, more than 350 ℃ and less than or equal to 450 ℃, more than 450 ℃ and less than or equal to 550 ℃, more than 550 ℃ and less than or equal to 650 ℃, more than 650 ℃ and less than or equal to 750 ℃, more than 750 ℃ and less than or equal to 850 ℃ and less than or equal to 1000 ℃, and pyrolysis products obtained in four temperature areas of 200 ℃ -350 ℃, more than 350 ℃ and less than or equal to 450 ℃, more than or equal to 550 ℃ and more than 550 ℃ and less than or equal to 650 ℃ are mixed according to a mass ratio of 1-3:0.5-1.5:1:1-3, so as to obtain the tobacco pyrolysis products; or mixing pyrolysis products obtained in three temperature areas of 200-350 ℃, more than 350 ℃ and less than or equal to 450 ℃ and more than 450 ℃ and less than or equal to 550 ℃ according to the mass ratio of 0.5-1.5:0.5-1.5:1 to obtain the tobacco pyrolysis products; or mixing pyrolysis products obtained in three temperature areas of 650-750 ℃, more than 750 ℃ and less than or equal to 850 ℃ and more than 850 ℃ and less than or equal to 1000 ℃ according to the mass ratio of 0.5-1.5:0.5-1.5:1 to obtain the tobacco pyrolysis products. The components of the tobacco pyrolysis products obtained by pyrolysis of the impurity-removed tobacco extract at different temperatures are different, and the tobacco pyrolysis products at a plurality of different temperatures are compounded, so that the tobacco herb fragrance can be reduced and enhanced better.

As a preferable scheme, pyrolysis gas generated in the pyrolysis process is trapped by a cold trap, and generated pyrolysis oil is dissolved and absorbed by an absorption liquid used for trapping the pyrolysis gas in the cold trap. As a more preferable scheme, when the pyrolysis gas is trapped by adopting a cold trap, liquid nitrogen is used as a cold trap agent, ethanol is used as an absorption liquid, and the volume ratio of the mass of the impurity-removed tobacco extract to the absorption liquid is 1 g:5-20 mL. Ultrasound or oscillation can be adopted to assist in accelerating dissolution in the dissolution and absorption process.

As a preferable scheme, the pyrolysis gas generated in the pyrolysis process is captured by an adsorption material, and the generated pyrolysis oil is mixed with the adsorption material for capturing the pyrolysis gas and is dissolved and extracted by a solvent. As a more preferable scheme, when the pyrolysis gas is captured by an adsorption material, an XAD-2 adsorption tube is used as the adsorption material. The adopted solvent is ethanol, and the volume ratio of the mass of the relative impurity-removed tobacco extract to the ethanol is 1 g:5-20 mL. Ultrasonic or vibration can be adopted to assist in accelerating dissolution in the dissolution and extraction process.

The invention also provides a tobacco pyrolysis product, which is obtained by the preparation method.

The invention also provides application of the tobacco pyrolysis product, which is applied to heating non-combustible cigarettes. Because of the difference of main components contained in tobacco pyrolysis products obtained by different pore diameter dialysis bags and different pyrolysis temperatures, the tobacco pyrolysis products can be used for heating non-combustible cigarettes to show different application effects. According to the technical scheme, macromolecular substances which have negative effects on sensory quality in tobacco are directionally removed by optimizing the dialysis bag with the molecular weight cutoff of 20 KD-10 KD, the impurity-removed tobacco extract is pyrolyzed at a plurality of different temperatures, and pyrolysis products at the temperatures are compounded into a mixed pyrolysis product according to a proper proportion, so that a better application effect is achieved in non-burning cigarettes.

As a preferable scheme, the addition amount of the tobacco pyrolysis product in the heated non-combustible cigarette is 1-20 mg/cigarette.

The invention provides a preparation method of a tobacco pyrolysis product, which comprises the following steps:

(1) Grinding tobacco into tobacco powder

Balancing tobacco raw materials (temperature 22+ -2deg.C, relative humidity 60+ -5%) for 24 hr, pulverizing, and grinding to obtain powder with diameter of about 200 mesh; tobacco materials include, but are not limited to, flue-cured tobacco, burley tobacco, aromatic tobacco, cigar, sun-cured tobacco, tobacco flowers, mixtures of one or more of tobacco stalks;

(2) Preparation of tobacco extract

Extracting by adopting a solvent heating reflux mode, evaporating the extracting solution under reduced pressure, and freeze-drying to obtain tobacco extract; the solvents include, but are not limited to, ethanol, water, petroleum ether, ethyl acetate, and mixtures thereof; ratio of tobacco dust to solvent = 1g: 2-10 mL; the heating mode is preferably water bath heating, and the heating temperature is preferably 70-90 ℃; the water temperature in the reduced pressure distillation device is 40-65 ℃, and the distillation is carried out until no liquid drips out;

(3) Preparation of impurity-removed tobacco extract

Filling the prepared tobacco extract into a dialysis bag, sealing by a dialysis clamp, and performing dialysis to remove impurities; the dialysis bag can select molecular weight of 0.3 KD-30 KD, and can also select membrane separation technology for screening, however, the membrane separation technology cannot realize industrial production; the dialysate is preferably 5-25% ethanol water solution; three times of dialysis are carried out, each time of dialysis is 6 hours, and the ratio of the tobacco extract to the dialysate is preferably 1g:100mL. And (5) performing rotary evaporation after dialysis to obtain tobacco extractum with different molecular weights.

(4) Pyrolyzing the impurity-removed tobacco extract;

and (3) pyrolyzing the impurity-removed tobacco extract, wherein a pyrolysis product comprises pyrolysis gas and pyrolysis oil. Absorbing pyrolysis gas by adopting a solution-cold trap trapping method, and transferring pyrolysis oil into a cold trap solution for absorbing the pyrolysis gas after pyrolysis is finished so as to fully dissolve and absorb the pyrolysis oil; the pyrolysis mode includes, but is not limited to, microwave heating pyrolysis, infrared heating pyrolysis, electromagnetic heating pyrolysis or resistance wire heating pyrolysis; the pyrolysis temperature is between 200 ℃ and 1000 ℃, the pyrolysis process can carry out pyrolysis on the impurity-removed tobacco extract in a plurality of temperature areas within the temperature range of 200 ℃ to 1000 ℃ respectively, and then the pyrolysis products obtained by pyrolysis in each temperature area are compounded, for example, the impurity-removed tobacco extract is pyrolyzed in the temperature areas of 200 ℃ to 350 ℃, more than 350 ℃ and less than or equal to 450 ℃, more than 450 ℃ and less than or equal to 550 ℃, more than 550 ℃ and less than or equal to 650 ℃, more than 650 ℃ and less than or equal to 750 ℃, less than or equal to 850 ℃ or more than 850 ℃ and less than or equal to 1000 ℃, and the pyrolysis products obtained in any two temperature areas are mixed to obtain the tobacco pyrolysis products; the pyrolysis gas is preferably selected to be trapped by a cold trap method, and the cold trap device comprises, but is not limited to, adopting liquid nitrogen as a cold trap agent; cold trap absorption liquids include, but are not limited to, ethanol; ratio of mass of purified tobacco extract to volume of absorption liquid in cold trap = 1g: 5-20 mL, and the dissolution and absorption process can be carried out by adopting ultrasonic dissolution or oscillation dissolution. If the pyrolysis device does not support the cold trap device, an adsorption material with functions is selected to capture pyrolysis gas, such as an XAD-2 adsorption tube, the adsorption material capturing the pyrolysis gas is mixed with pyrolysis oil, solvent is adopted for dissolution extraction, the solvent is ethanol, and the volume ratio of the mass of the impurity-removed tobacco extract to the solvent is 1 g:5-20 mL.

(5) Applying the tobacco pyrolysis product to a heated non-combustible new tobacco product;

and injecting the tobacco pyrolysis product into the heated cigarettes, and sucking after the solvent is evaporated.

Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:

the invention provides a tobacco pyrolysis product which is used for novel tobacco products, can obviously enhance the smoking fragrance of the novel tobacco products and enhance the richness of smoke, thereby more realistically realizing the smoking feeling of cigarettes and having better practical value.

The invention provides a method for preparing a tobacco pyrolysis product based on a dialysis principle, which can directionally remove macromolecular substances which have negative effects on sensory quality in tobacco in the process of preparing tobacco extract by adopting a dialysis technology, and can obtain the tobacco pyrolysis product by controlling the molecular weight of the extract and the pyrolysis temperature, so that the tobacco herbal fragrance of a novel tobacco product can be enhanced, the fragrance components can be separated and enriched, and the quality fluctuation influence of tobacco raw materials on the tobacco extract is reduced.

Drawings

FIG. 1 is a gas chromatography total ion flow diagram of a tobacco extract of less than 30KD at 400 ℃.

FIG. 2 is a gas chromatography total ion flow diagram of tobacco extract at 400 ℃ with less than 15 KD.

FIG. 3 is a gas chromatography total ion flow diagram of tobacco extract at 400 ℃ with less than 10KD.

Detailed Description

The invention is further described below in connection with specific embodiments. The following examples are intended to illustrate the invention and are not intended to be limiting.

Example 1

Selecting raw materials of flue-cured tobacco, balancing for 24 hours, and grinding, wherein the granularity of tobacco powder is about 200 meshes. The tobacco extract is prepared by adopting a thermal reflux mode, the water bath temperature is 80 ℃, the solvent adopts ethanol to water volume ratio=1:1, and the ratio of tobacco powder to solvent=1 g:5mL, heated at reflux for 3 hours. Rotary evaporating the extract liquid, and then performing freeze drying treatment for 48 hours to prepare tobacco extract; transferring the obtained tobacco extract into a dialysis bag with 15KD for dialysis treatment, and dialyzing for three times by using a 20% ethanol water solution as a dialyzate, wherein the dialysis time is 6h each time, and the ratio of the tobacco extract to the dialyzate is 1g:100mL. Taking three parts of tobacco leaf extract subjected to dialysis, carrying out microwave pyrolysis at 300 ℃, 400 ℃ and 500 ℃ respectively at about 10g each part, wherein 50mL of absorption liquid in a cold trap is adopted, ethanol is selected as the absorption liquid, and pyrolysis oil is subjected to ultrasonic treatment by adopting absorption liquid for absorbing pyrolysis gasAuxiliary dissolution. The cleavage products at three temperatures are in mass ratio M ₃₀₀ C, extract: m is M ₄₀₀ C, extract: m is M ₅₀₀ C extract = 1: 1:1 to a heated cigarette at a rate of 10 mg/cigarette, and sensory quality comparison evaluation was performed with a conventional tobacco extract pyrolysis product (prepared according to example 1, except that no dialysis treatment was performed) according to the same compounding ratio, and the results are shown in table 2. Sensory overall evaluation, namely, the heated cigarette smoke compounded by the tobacco extract pyrolysis product after dialysis is finer, the fragrance permeability is better, and the residual taste is cleaner.

The dialysis bag in example 1 was replaced with 30KD and 10KD, and the total ion flow chart of gas chromatography at 400 ℃ of the prepared impurity-removed tobacco extract is shown in figures 1-3.

TABLE 1 aroma component determination results of pyrolysis products of the purified tobacco extract obtained in example 1 in three different dialysis bags of 30KD, 15KD and 10KD at 400 DEG C

Example 2

Selecting burley tobacco raw materials, balancing for 24 hours, grinding, and the granularity of tobacco powder is about 200 meshes. The tobacco extract is prepared by adopting a thermal reflux mode, the water bath temperature is 80 ℃, the solvent adopts ethanol to water volume ratio=8:2, the ratio of tobacco powder to solvent=1 g:7mL, and the thermal reflux time is 3 hours. Rotary evaporating the extract liquid, and then performing freeze drying treatment for 48 hours to prepare tobacco extract; transferring the obtained tobacco extract into a 10KD dialysis bag, dialyzing, and dialyzing for three times by using a 20% ethanol water solution as a dialyzate, wherein the dialysis time is 6h each time, and the ratio of the tobacco extract to the dialyzate is 1 g/100 mL. Taking three parts of tobacco leaf extract after dialysis, wherein each part is about 10g, respectively performing microwave pyrolysis at 400 ℃, 500 ℃ and 600 ℃, and absorbing liquid in a cold trapAnd (3) selecting ethanol for 100mL of absorption liquid, and performing ultrasonic-assisted dissolution on pyrolysis oil by adopting the absorption liquid for absorbing pyrolysis gas. The cleavage products at three temperatures are in mass ratio M ₄₀₀ C, extract: m is M ₅₀₀ C, extract: m is M ₆₀₀ C extract = 1: 1:1 are added into the heated cigarettes in a compounding way, the adding amount is 10 mg/cigarette, and sensory quality comparison evaluation is carried out with the conventional tobacco extract pyrolysis product (prepared according to the example 2, but without dialysis treatment) according to the same compounding proportion, and the results are shown in table 2. Sensory overall evaluation, namely, the heated cigarette smoke compounded by the tobacco extract pyrolysis product after dialysis is more elegant and finer, and the fragrance permeability is better.

Example 3

Selecting spice tobacco leaf raw materials, balancing for 24 hours, and grinding, wherein the granularity of tobacco powder is about 200 meshes. The tobacco extract is prepared by adopting a thermal reflux mode, the water bath temperature is 80 ℃, the solvent adopts ethanol to water volume ratio=3:1, the ratio of tobacco powder to solvent=1 g:7mL, and the thermal reflux time is 3 hours. Rotary evaporating the extract liquid, and then performing freeze drying treatment for 48 hours to prepare tobacco extract; transferring the obtained tobacco extract into a 20KD dialysis bag, dialyzing, and dialyzing for three times by using a 20% ethanol water solution as a dialyzate, wherein the dialysis time is 6h each time, and the ratio of the tobacco extract to the dialyzate is 1 g/100 mL. Taking three parts of tobacco leaf extract subjected to dialysis, carrying out microwave pyrolysis at three temperature points of 700 ℃, 800 ℃ and 900 ℃ respectively, wherein the absorption liquid in a cold trap is 100mL, ethanol is selected as the absorption liquid, and pyrolysis oil is dissolved in an ultrasonic auxiliary way by adopting the absorption liquid for absorbing pyrolysis gas. The cleavage products at three temperatures are in mass ratio M ₇₀₀ C, extract: m is M ₈₀₀ C, extract: m is M ₉₀₀ C extract = 1: 1:1, the additive is added into the heated cigarettes in a compounding way, the adding amount is 10 mg/cigarette, and sensory quality comparison evaluation is carried out on the heated cigarettes by independently adopting a cracking product at 700 ℃ in comparison with the non-compounding way, and the results are shown in table 2. Sensory overall evaluation, namely, the smoke richness of the heated cigarettes compounded by the pyrolysis products of the tobacco extract after dialysis is greatly improved.

Table 2 examples 1 to 3 results of sensory evaluation of pyrolysis products of tobacco extracts

Claims (14)

1. A method for preparing tobacco pyrolysis products based on dialysis principle, which is characterized in that: the method comprises the following steps:

1) Grinding the tobacco raw materials to obtain tobacco powder;

2) Extracting tobacco powder by a solvent to obtain tobacco extract;

3) Dialyzing the tobacco extract to obtain impurity-removed tobacco extract;

4) And carrying out pyrolysis treatment on the impurity-removed tobacco extract to obtain a tobacco pyrolysis product.

2. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the tobacco raw material comprises at least one of flue-cured tobacco, burley tobacco, aromatic tobacco, cigar, sun-cured tobacco, tobacco flower and tobacco straw.

3. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the tobacco raw material is ground into powder with 100-300 meshes.

4. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the solvent extraction process comprises the following steps: and (3) placing the tobacco powder in a solvent for heating reflux extraction, recovering the solvent from the obtained extracting solution through reduced pressure distillation, and then performing freeze drying to obtain the tobacco extract.

5. The method for preparing a tobacco pyrolysis product based on the dialysis principle according to claim 4, wherein:

the solid-liquid ratio of the tobacco powder to the solvent is 1 g:2-10 mL, and the reflux temperature is 70-90 ℃;

the solvent is at least one of ethanol, water, petroleum ether and ethyl acetate;

the reduced pressure distillation temperature is 40-65 ℃.

6. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the molecular weight cut-off of the dialysis bag adopted in the dialysis treatment process is 0.3 KD-30 KD.

7. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the dialysate adopted in the dialysis treatment process is ethanol water solution with the mass percentage concentration of 5-25%, the dialysis times are 2-4, the dialysis time is 5-7 h each time, and the mass volume ratio of the tobacco extract to the dialysate is 1 g:50-100 mL.

8. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the pyrolysis treatment adopts a microwave heating pyrolysis mode, and the pyrolysis temperature is controlled within a temperature range of 200-1000 ℃ in the pyrolysis treatment process.

9. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1 or 8, characterized in that: in the pyrolysis treatment process, the impurity-removed tobacco extract is pyrolyzed at any temperature in a temperature range of 200-1000 ℃ to obtain a tobacco pyrolysis product, or the impurity-removed tobacco extract is pyrolyzed at a temperature range of 200-350 ℃, more than 350 ℃ and less than or equal to 450 ℃, more than 450 ℃ and less than or equal to 550 ℃, more than 550 ℃ and less than or equal to 650 ℃, more than 650 ℃ and less than or equal to 750 ℃, more than or equal to 850 ℃ or more than 850 ℃ and less than or equal to 1000 ℃, and the pyrolysis products obtained in any two temperature ranges are mixed to obtain the tobacco pyrolysis product.

10. A method for preparing tobacco pyrolysis products based on the dialysis principle according to claim 1, characterized in that: the pyrolysis gas generated in the pyrolysis process is trapped by adopting a cold trap, and the generated pyrolysis oil is dissolved and absorbed by adopting an absorption liquid for trapping the pyrolysis gas in the cold trap; or, the pyrolysis gas generated in the pyrolysis process is captured by adopting an adsorption material, and the generated pyrolysis oil is mixed with the adsorption material for capturing the pyrolysis gas and is dissolved and extracted by adopting a solvent.

11. A method for preparing a tobacco pyrolysis product based on the dialysis principle according to claim 10, wherein: when the pyrolysis gas is trapped by adopting a cold trap, liquid nitrogen is used as a cold trap agent, ethanol is used as an absorption liquid, and the volume ratio of the mass of the impurity-removed tobacco extract to the absorption liquid is 1 g:5-20 mL.

12. A method for preparing a tobacco pyrolysis product based on the dialysis principle according to claim 10, wherein: when the pyrolysis gas is trapped by adopting an adsorption material, an XAD-2 adsorption tube is used as the adsorption material.

13. A tobacco pyrolysis product, characterized by: obtained by the production process according to any one of claims 1 to 12.

14. Use of a tobacco pyrolysis product according to claim 13, wherein: the method is applied to heating the non-combustible cigarettes.

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