CN116264909A - A method for preparing tobacco pyrolysis products based on the principle of dialysis, tobacco pyrolysis products and applications - Google Patents

Abstract

The invention discloses a method for preparing tobacco pyrolysis products based on the principle of dialysis, tobacco pyrolysis products and applications. The preparation method of the tobacco pyrolysis product is as follows: the tobacco raw material is ground into powder to obtain tobacco powder; the tobacco powder is extracted by solvent to obtain tobacco extract; the tobacco extract is subjected to dialysis to obtain impurity-removed tobacco extract; The tobacco extract is subjected to pyrolysis treatment to obtain pyrolysis products. This method uses dialysis technology to remove substances in the extract that have a negative impact on smoking quality, such as proteins and polysaccharides. At the same time, it enriches small molecules and volatile components that play an important role in sensory characteristics, which is beneficial to tobacco extract. Quality stability.

Description

A method for preparing tobacco pyrolysis products based on the principle of dialysis and tobacco pyrolysis products and application

technical field

The present invention relates to a tobacco pyrolysis product and its preparation method and application, in particular to a method for preparing a tobacco pyrolysis product based on the principle of dialysis, and also to the tobacco pyrolysis product prepared by the method and its use in heat-not-burn tobacco products The application belongs to the technical field of new tobacco products.

Background technique

According to the calculation data of Euromonitor International, in 2020, 55.28 million boxes of cigarettes will be sold in other markets around the world except China, a decrease of 5.2% from the previous year, the largest decline in the past five years. In terms of sales, the global market excluding China achieved a total sales of US$19.62 billion, an increase of 4.3% over the previous year; sales of heated cigarettes were US$17.78 billion, an increase of 15.8% over the previous year. Worldwide, heated cigarettes have become the main driving force for tobacco sales.

During the burning and smoking process of cigarettes, there are three temperature ranges from about 900 °C near the charcoal line to about 50 °C near the filter tip, namely, the high-temperature combustion zone, the pyrolysis distillation zone, and the condensation zone. Compared with existing cigarettes, new tobacco products have less fluctuation in heating temperature, and the richness of aroma substances cracked or volatilized at the same temperature is obviously insufficient. At present, most of the mainstream heated cigarette products on the market are tobacco-flavored. However, new tobacco products still have defects such as insufficient smoke flavor, which is quite different from the sensory quality of cigarettes when they are burned and smoked. In addition, there are macromolecular substances such as proteins in tobacco extracts that have negative effects on sensory quality, and targeted removal of such macromolecular substances plays an important role in improving the smoking quality of heated cigarettes. At present, membrane separation technology is mainly used as the means of separation. However, in the process of industrial production, membrane clogging often occurs in membrane separation technology, which seriously affects the progress of production.

Based on this, Henan China Tobacco Chen Zeshao et al. (invention patent publication number CN 110236232 A) added Maillard reactants to the tobacco leaf extract for microwave cracking, and used an organic solvent to extract the pyrolysis oil, and added electrons after rotary evaporation. In the smoke liquid, this method can significantly enhance the aroma of electronic cigarettes and enhance the baking smell of electronic cigarettes; however, there may be shortcomings, that is, the tobacco leaf extract contains a large amount of soluble proteins and polysaccharides that have a negative impact on sensory quality; in addition , in papers published by Zheng Jianyu et al., the use of ultrafiltration membrane technology can effectively remove macromolecular substances that have a negative impact on sensory quality in tobacco extracts, and the separation and enrichment technology can reduce the dependence of tobacco extracts on tobacco raw materials , improve quality stability.

Contents of the invention

Aiming at the deficiencies of the prior art, the first object of the present invention is to provide a tobacco pyrolysis product, which can be used in new tobacco products of heat-not-burn cigarettes, which can significantly enhance the smoky aroma of tobacco products, enhance The richness of the smoke makes the smoking experience of cigarettes more realistic and has good practical value.

The second object of the present invention is to provide a method for preparing tobacco pyrolysis products based on the principle of dialysis, which can directionally remove macromolecules in tobacco that have a negative impact on sensory quality during the preparation of tobacco extract by using dialysis technology Substances, and by controlling the molecular weight and pyrolysis temperature of the extract to obtain tobacco pyrolysis products, it can not only enhance the tobacco aroma of new tobacco products, but also separate and enrich the aroma components, and reduce the influence of tobacco raw materials on tobacco extracts. quality fluctuations.

The third object of the present invention is to provide an application of a tobacco pyrolysis product, which is used in a new type of tobacco product of a heat-not-burn cigarette, which can significantly enhance the smoky aroma of the tobacco product and enhance the richness of the smoke Sex, so that the smoking experience of cigarettes is more realistic, and it has good practical value.

In order to achieve the above technical purpose, the present invention provides a method for preparing tobacco pyrolysis products based on the principle of dialysis, which comprises the following steps:

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

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

3) The tobacco extract is processed by dialysis to obtain the tobacco extract for removing impurities;

4) Pyrolyzing the impurity-removing tobacco extract to obtain a tobacco pyrolysis product.

The key to the technical solution of the present invention is to perform dialysis treatment on the tobacco extract. During the dialysis treatment, the dialysis with a suitable pore size can be selected according to different tobacco raw materials and the types of macromolecular substances contained in the tobacco raw materials that have a negative impact on the sensory quality. Bags can effectively remove these macromolecules.

As a preferred solution, the tobacco raw material includes at least one of flue-cured tobacco, burley tobacco, oriental tobacco, cigar tobacco, sun-cured tobacco, tobacco flowers, and tobacco stalks. Common tobacco raw materials in the prior art are all suitable for the technical solution of the present invention.

As a preferred solution, the tobacco raw material is ground to 100-300 mesh. Grinding the tobacco raw material to an appropriate particle size is beneficial to the efficient extraction of useful components in the tobacco raw material.

As a preferred solution, the solvent extraction process is as follows: the tobacco powder is placed in a solvent for heating and reflux extraction, the obtained extract is distilled under reduced pressure to recover the solvent, and then freeze-dried to obtain tobacco extract.

As a preferred solution, the solid-to-liquid ratio of the tobacco powder to the solvent is 1g:2-10mL, and the reflux temperature is 70-90°C.

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

As a preferred solution, the vacuum distillation temperature is 40-65°C.

As a preferred solution, the molecular weight cut-off of the dialysis bag used in the dialysis treatment process is 0.3KD-30KD. As can be seen from Table 1, the content of the main components of the tobacco extract obtained by dialysis bags with different molecular weight cut-offs is completely different. Considering the content of useful components and unfavorable impurities contained in the tobacco extract itself and the content of pyrolysis The content of useful ingredients in the product, etc., the molecular weight cut-off of the dialysis bag is more preferably 20KD-10KD.

As a preferred solution, the dialysate used in the dialysis treatment process is an aqueous ethanol solution with a mass percent concentration of 5-25%, the number of dialysis times is 2-4 times, and the dialysis time is 5-7 hours each time. Tobacco extract and The mass volume ratio of the dialysate is 1g:50-100mL.

As a preferred solution, microwave heating and pyrolysis is adopted, and the pyrolysis temperature is controlled within a temperature range of 200° C. to 1000° C. during the pyrolysis treatment.

As a more preferred solution, during the pyrolysis treatment, the impurity-removing tobacco extract is pyrolyzed at any temperature in the temperature range of 200°C to 1000°C to obtain tobacco pyrolysis products, or the impurity-removing tobacco extract Paste at 200°C to 350°C, >350°C and ≤450°C, >450°C and ≤550°C, >550°C and ≤650°C, >650°C and ≤750°C, >750°C and ≤850°C or >850°C ℃ and ≤ 1000 ℃ for pyrolysis, and the pyrolysis products obtained in any two or more temperature regions are mixed to obtain tobacco pyrolysis products. More preferably, the impurity-removing tobacco extract is heated at 200°C to 350°C, >350°C and ≤450°C, >450°C and ≤550°C, >550°C and ≤650°C, >650°C and ≤750°C, >750°C ℃ and ≤ 850 ℃ or > 850 ℃ and ≤ 1000 ℃ for pyrolysis, and mixing pyrolysis products obtained in any three or four temperature regions to obtain tobacco pyrolysis products. Even more preferably, the impurity-removing tobacco extract is divided into several parts, and respectively at 200°C to 350°C, >350°C and ≤450°C, >450°C and ≤550°C, >550°C and ≤650°C, >650°C And ≤750°C, >750°C and ≤850°C and >850°C and ≤1000°C temperature range for pyrolysis, 200°C to 350°C, >350°C and ≤450°C, >450°C and ≤550°C and The pyrolysis products obtained in the four temperature regions of >550°C and ≤650°C are mixed according to the mass ratio of 1~3:0.5~1.5:1:1~3 to obtain tobacco pyrolysis products; or, 200°C~350°C, >350°C ℃ and ≤ 450 ℃ and > 450 ℃ and ≤ 550 ℃ the pyrolysis products obtained in the three temperature zones are mixed according to the mass ratio of 0.5-1.5:0.5-1.5:1 to obtain tobacco pyrolysis products; or, 650 ℃ ~ 750 ℃, The pyrolysis products obtained in the three temperature regions of >750°C and ≤850°C and >850°C and ≤1000°C are mixed according to the mass ratio of 0.5-1.5:0.5-1.5:1 to obtain tobacco pyrolysis products. There are differences in the composition of the tobacco pyrolysis products obtained by pyrolyzing the impurity-removing tobacco extract at different temperatures. Combining multiple tobacco pyrolysis products at different temperatures can better restore and enhance the original aroma of tobacco.

As a preferred solution, the pyrolysis gas produced during the pyrolysis process is captured by a cold trap, and the pyrolysis oil produced is dissolved and absorbed by the absorption liquid used to capture the pyrolysis gas in the cold trap. As a preferred scheme, when the pyrolysis gas is captured by a cold trap, liquid nitrogen is used as the cold trap agent, and ethanol is used as the absorption liquid, and the volume ratio of the quality of the impurity-removing tobacco extract to the absorption liquid is 1g: 5~20mL. During the dissolution and absorption process, ultrasound or vibration can be used to assist in accelerating the dissolution.

As a preferred solution, the pyrolysis gas generated during the pyrolysis process is captured by an adsorption material, and the generated pyrolysis oil is mixed with the adsorption material used to capture the pyrolysis gas and extracted by solvent dissolution. As a preferred solution, when the pyrolysis gas is captured by an adsorption material, XAD-2 adsorption tube is used as the adsorption material. The solvent used is ethanol, and the volume ratio of the mass of the impurity-removing tobacco extract to the ethanol is 1g:5-20mL. During the dissolution extraction process, ultrasound or vibration can be used to assist in accelerating the dissolution.

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

The invention also provides an application of tobacco pyrolysis product, which is applied to heat-not-burn cigarettes. Due to the differences in the main components contained in the tobacco pyrolysis products obtained under different pore diameters and different pyrolysis temperatures, the use of the dialysis bags in heat-not-burn cigarettes shows different application effects. The technical scheme of the present invention optimizes the molecular weight cut-off of the dialysis bag to be 20KD～10KD, removes macromolecular substances in tobacco that have a negative impact on the sensory quality, and then pyrolyzes the impurity-removing tobacco extract at several different temperatures. The pyrolysis products at high temperature are then compounded into a mixed pyrolysis product in an appropriate proportion, which shows a better application effect in non-burning cigarettes.

As a preferred solution, the amount of tobacco pyrolysis products added to heat-not-burn cigarettes is 1-20 mg/cigarette.

The invention provides a method for preparing a tobacco pyrolysis product, which is obtained through the following steps:

(1) Tobacco is ground into tobacco powder

Balance the tobacco raw material (temperature 22 ± 2 ° C, relative humidity 60 ± 5%) for 24 hours before grinding, the diameter of the powder after grinding is about 200 mesh; tobacco raw material includes but not limited to flue-cured tobacco, Burley tobacco, A mixture of one or more of oriental tobacco, cigar tobacco, sun-dried tobacco, tobacco flower, and tobacco straw;

(2) Preparation of Tobacco Extract

The solvent is heated and refluxed for extraction, the extract is evaporated to dryness under reduced pressure, and then freeze-dried to obtain tobacco extract; the solvent includes but is not limited to ethanol, water, petroleum ether, ethyl acetate and mixtures thereof; The ratio of powder to solvent = 1g: 2~10mL; the heating method is preferably water bath heating, and the heating temperature is preferably 70~90°C; the water temperature in the vacuum distillation device is 40~65°C, distill until no liquid drips out;

(3) preparation of impurity-removing tobacco extract

Put the prepared tobacco extract into a dialysis bag, seal it with a dialysis clip, and then carry out dialysis to remove impurities; the dialysis bag can be selected with a molecular weight between 0.3KD and 30KD, and can also be screened by suboptimal membrane separation technology However, membrane separation technology cannot realize industrialized production for the time being; the preferred 5-25% ethanol aqueous solution for dialysate; carry out three dialysis, each dialysis time is 6h, the ratio of tobacco extract and dialysate is preferably 1g:100mL. Rotary evaporation was performed after dialysis to obtain tobacco extracts with different molecular weights.

(4) pyrolyzing the tobacco extract for removing impurities;

The impurity-removed tobacco extract is pyrolyzed, and the pyrolysis product includes pyrolysis gas and pyrolysis oil. The pyrolysis gas is absorbed by the method of solution-cold trap capture. After the pyrolysis is completed, the pyrolysis oil is transferred to the cold trap solution for absorbing the pyrolysis gas, and fully dissolved and absorbed; the pyrolysis method 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°C and 1000°C, and the pyrolysis process can remove impurities from the tobacco extract at a temperature of 200°C to 1000°C Within the range, pyrolysis is carried out in multiple temperature regions, and then the pyrolysis products obtained by pyrolysis in each temperature region are compounded, such as removing impurities from tobacco extract at 200°C to 350°C, >350°C and ≤450°C, >450°C and ≤550°C, >550°C and ≤650°C, >650°C and ≤750°C, >750°C and ≤850°C or >850°C and ≤1000°C, any two The pyrolysis products obtained in the above temperature range are mixed to obtain tobacco pyrolysis products; the pyrolysis gas is preferably collected by a cold trap, and the cold trap device includes but is not limited to the use of liquid nitrogen as a cold trap agent; the cold trap absorption liquid includes but Not limited to ethanol; the ratio of the mass of impurity-removing tobacco extract to the volume of the absorption liquid in the cold trap = 1g: 5-20mL, and the dissolution and absorption process can be done by ultrasonic or vibrational dissolution. If the pyrolysis device does not support the installation of a cold trap device, it is sub-optimal to choose a functional adsorption material to capture the pyrolysis gas, such as XAD-2 adsorption tube. The adsorption material that captures the pyrolysis gas is mixed with the pyrolysis oil and extracted by solvent dissolution , the solvent is ethanol, and the volume ratio of the impurity-removing tobacco extract quality to the solvent=1g:5～20mL.

(5) Apply tobacco pyrolysis products to new heat-not-burn tobacco products;

The pyrolysis product of tobacco is injected into the heated cigarette, and after the solvent evaporates, it can be smoked.

Compared with the prior art, the beneficial technical effect brought by the technical solution of the present invention:

The invention provides a tobacco pyrolysis product, which is used in new-type tobacco products, can significantly enhance the smoky aroma of the new-type tobacco products, enhance the richness of the smoke, thereby more realistically smoking the cigarette, and has good practical value.

The present invention provides a method for preparing tobacco pyrolysis products based on the principle of dialysis, which can directionally remove macromolecular substances in tobacco that have a negative impact on sensory quality in the process of preparing tobacco extract by using dialysis technology, and by using dialysis technology The molecular weight of the extract and the pyrolysis temperature are controlled to obtain tobacco pyrolysis products, which can not only enhance the tobacco aroma of new tobacco products, but also separate and enrich the aroma components, and reduce the influence of tobacco raw materials on the quality fluctuation of tobacco extracts.

Description of drawings

Figure 1 is a gas chromatographic total ion chromatogram of tobacco extract less than 30KD at 400°C.

Figure 2 is a gas chromatographic total ion chromatogram of tobacco extract less than 15KD at 400°C.

Figure 3 is a gas chromatographic total ion chromatogram of tobacco extract less than 10KD at 400°C.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. The following examples are intended to illustrate the present invention without further limiting the invention.

Example 1

The raw material of flue-cured tobacco leaves is selected, and after equilibrating for 24 hours, it is pulverized, and the particle size of the tobacco powder is about 200 mesh. Tobacco extract was prepared by heat reflux, the water bath temperature was 80°C, the solvent was ethanol: water volume ratio = 1:1, the ratio of tobacco powder to solvent = 1g: 5mL, and the heating and reflux time was 3 hours. Rotate the extract to dryness and then freeze-dry it for 48 hours to prepare tobacco extract; transfer the obtained tobacco extract to a 15KD dialysis bag for dialysis treatment, choose 20% ethanol aqueous solution as the dialysate, and dialyze three times , each dialysis time is 6h, the ratio of tobacco extract and dialysate is 1g: 100mL. Take three parts of tobacco leaf extract after dialysis, about 10g each, and carry out microwave pyrolysis at three temperature points of 300°C, 400°C, and 500°C respectively. The absorption liquid in the cold trap is 50mL. Ultrasonic-assisted dissolution is performed using an absorption liquid that absorbs pyrolysis gas. The pyrolysis products at the three temperatures were added to heated cigarettes according to the mass ratio of M ₃₀₀ °C extract: M ₄₀₀ °C extract: M ₅₀₀ °C extract = 1: 1: 1, the addition amount was 10mg/stick, and was mixed with Conventional tobacco extract pyrolysis products (prepared according to Example 1, but without dialysis treatment) were subjected to sensory quality comparative evaluation according to the same compounding ratio, and the results are shown in Table 2. According to the overall sensory evaluation, the smoke of the heated cigarette compounded with the pyrolysis product of tobacco extract after dialysis is more delicate, the aroma is more transparent, and the aftertaste is cleaner.

The dialysis bag in Example 1 was replaced with 30KD and 10KD, and the impurity-removing tobacco extract prepared in the same way, the gas chromatographic total ion chromatogram at 400°C is as shown in Figures 1-3.

Table 1. is 30KD, 15KD, 10KD in embodiment 1 three kinds of different dialysis bag gained impurity-removing tobacco extracts under the condition of 400 DEG C of the aroma component determination result of the pyrolysis product

Example 2

The raw material of Burley tobacco leaves was selected, and after 24 hours of equilibration, it was milled, and the particle size of the tobacco powder was about 200 mesh. Tobacco extract was prepared by heat reflux, the water bath temperature was 80°C, the solvent was ethanol:water volume ratio=8:2, the ratio of tobacco powder to solvent=1g:7mL, and the heating and reflux time was 3 hours. Rotate the extract to dryness and freeze-dry it for 48 hours to prepare tobacco extract; transfer the obtained tobacco extract to a dialysis bag of 10KD for dialysis treatment, select 20% ethanol aqueous solution as the dialysate, and dialyze three times , each dialysis time is 6h, the ratio of tobacco extract and dialysate is 1g:100mL. Take three parts of tobacco leaf extract after dialysis, about 10g each, and carry out microwave pyrolysis at three temperature points of 400°C, 500°C, and 600°C respectively. The absorption liquid in the cold trap is 100mL. Ultrasonic-assisted dissolution is performed using an absorption liquid that absorbs pyrolysis gas. The pyrolysis products at the three temperatures are compounded and added to heated cigarettes according to the mass ratio of M ₄₀₀ °C extract: M ₅₀₀ °C extract: M ₆₀₀ °C extract = 1: 1: 1, the addition amount is 10mg/stick, And compare and evaluate the sensory quality with the conventional tobacco extract pyrolysis product (prepared according to Example 2, but without dialysis treatment) according to the same compounding ratio, and the results are shown in Table 2. According to the overall sensory evaluation, the smoke of the heated cigarette compounded with the pyrolysis product of tobacco extract after dialysis is more elegant and delicate, and the aroma permeability is better.

Example 3

The raw material of oriental tobacco leaves was selected, and after equilibrating for 24 hours, it was milled, and the particle size of the tobacco powder was about 200 mesh. Tobacco extract was prepared by heat reflux, the water bath temperature was 80°C, the solvent was ethanol:water volume ratio=3:1, the ratio of tobacco powder to solvent=1g:7mL, and the heating and reflux time was 3 hours. Rotate the extract to dryness and freeze-dry it for 48 hours to prepare tobacco extract; transfer the obtained tobacco extract to a 20KD dialysis bag for dialysis treatment, select 20% ethanol aqueous solution as the dialysate, and dialyze three times , each dialysis time is 6h, the ratio of tobacco extract and dialysate is 1g:100mL. Take three parts of tobacco leaf extract after dialysis, about 10g each, and carry out microwave pyrolysis at three temperature points of 700°C, 800°C, and 900°C respectively. The absorption liquid in the cold trap is 100mL. Ultrasonic-assisted dissolution is performed using an absorption liquid that absorbs pyrolysis gas. The pyrolysis products at the three temperatures are compounded and added to heated cigarettes according to the mass ratio of M ₇₀₀ °C extract: M ₈₀₀ °C extract: M ₉₀₀ °C extract = 1: 1: 1, and the added amount is 10mg/stick. And with no compounding, the pyrolysis product at 700°C was used alone for sensory quality comparison evaluation, and the results are shown in Table 2. According to the overall sensory evaluation, the smoke richness of heated cigarettes compounded with pyrolysis products of tobacco extract after dialysis is greatly improved.

Table 2 Sensory evaluation results of tobacco extract pyrolysis products of Examples 1-3

Claims (14)

1. A method for preparing tobacco pyrolysis products based on the principle of dialysis, characterized in that: comprising the following steps: 1) Grinding the tobacco raw material to obtain tobacco powder; 2) Extracting the tobacco powder by a solvent to obtain a tobacco extract; 3) The tobacco extract is processed by dialysis to obtain the tobacco extract for removing impurities; 4) Pyrolyzing the impurity-removing tobacco extract to obtain a tobacco pyrolysis product. 2. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1, characterized in that: the tobacco raw materials include flue-cured tobacco, burley tobacco, oriental tobacco, cigar tobacco, sun-dried tobacco, tobacco flower, tobacco At least one kind of straw. 3 . The method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1 , characterized in that: the tobacco raw material is ground to 100-300 mesh. 4. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1, characterized in that: the solvent extraction process is: placing the tobacco powder in a solvent for heating and reflux extraction, and the obtained extract is passed through The solvent is recovered by distillation under reduced pressure, and then freeze-dried to obtain tobacco extract. 5. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 4, characterized in that: The solid-to-liquid ratio of tobacco powder to solvent is 1g:2-10mL, and the reflux temperature is 70-90°C; Described solvent is at least one in ethanol, water, sherwood oil, ethyl acetate; The temperature of the vacuum distillation is 40-65°C. 6 . The method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1 , characterized in that: the molecular weight cut-off of the dialysis bag used in the dialysis process is 0.3KD-30KD. 7. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1, characterized in that: the dialysate used in the dialysis treatment process is an aqueous ethanol solution with a concentration of 5% to 25% by mass, and the dialysis The frequency is 2 to 4 times, each dialysis time is 5 to 7 hours, and the mass volume ratio of tobacco extract to dialysate is 1g:50 to 100mL. 8. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1, characterized in that: the pyrolysis treatment adopts a microwave heating pyrolysis method, and the pyrolysis temperature is controlled at 200°C during the pyrolysis treatment process ~1000℃ temperature range. 9. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1 or 8, characterized in that: during the pyrolysis process, the impurity-removed tobacco extract is placed in the temperature range of 200°C to 1000°C Carry out pyrolysis at any temperature to obtain tobacco pyrolysis products, or, remove impurities from tobacco extract at 200°C to 350°C, >350°C and ≤450°C, >450°C and ≤550°C, >550°C and ≤650°C ℃, >650°C and ≤750°C, >750°C and ≤850°C, or >850°C and ≤1000°C temperature range for pyrolysis, mixing pyrolysis products obtained in any two or more temperature ranges to obtain tobacco pyrolysis product. 10. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 1, characterized in that: the pyrolysis gas produced in the pyrolysis process is captured by a cold trap, and the pyrolysis oil produced is The absorption liquid used to capture the pyrolysis gas in the cold trap is dissolved and absorbed; or, the pyrolysis gas generated during the pyrolysis process is captured by an adsorption material, and the generated pyrolysis oil is used to capture the pyrolysis gas. The adsorbent material mixture is extracted by solvent dissolution. 11. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 10, characterized in that: when the pyrolysis gas is captured by a cold trap, liquid nitrogen is used as the cold trap agent, and ethanol is used as the cold trap agent. Absorbing liquid, the volume ratio of the mass of the impurity-removing tobacco extract to the absorbing liquid is 1g:5-20mL. 12. A method for preparing tobacco pyrolysis products based on the principle of dialysis according to claim 10, characterized in that: when the pyrolysis gas is captured by an adsorption material, an XAD-2 adsorption tube is used as the adsorption material. 13. A tobacco pyrolysis product, characterized in that it is obtained by the preparation method described in any one of claims 1-12. 14. The application of a tobacco pyrolysis product according to claim 13, characterized in that it is applied to heat-not-burn cigarettes.

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