A method for enriching and separating aroma components in reconstituted tobacco production wastewater

Abstract

The present invention belongs to the technical field of reconstituted tobacco production and processing, and specifically relates to a method for enriching and separating flavor components in reconstituted tobacco production wastewater. The method involves subjecting medium-concentration wastewater from reconstituted tobacco to multi-stage purification treatment and low-concentration wastewater to primary purification treatment, and then using a reverse osmosis membrane to separately concentrate the two purified liquids to obtain a high-nicotine retentate and a high-flavor retentate. The high-nicotine retentate and the high-flavor retentate are then compounded and subjected to freeze-thaw and centrifugation processes to obtain an enriched separation liquid containing high tobacco flavor components. The enriched components include the vast majority of tobacco flavor components in the wastewater, and the enriched separation liquid has high stability and a long storage life. The method of the present invention can improve the recovery rate of tobacco flavor components while significantly reducing wastewater discharge, and has good process adaptability and promotional significance.

Description

Technical Field

[0001] The invention belongs to the technical field of reconstituted tobacco production, and particularly relates to a method for enriching and separating flavor components in reconstituted tobacco production wastewater. Background Art

[0002] Reconstituted tobacco (RTT) is a recycled product made from tobacco materials such as tobacco dust, stems, and shredded tobacco leaves, using a papermaking process. Because it utilizes similar papermaking techniques to those used in traditional papermaking, producing one ton of reconstituted tobacco results in the discharge of over 50 tons of wastewater. Based on wastewater characteristics and discharge profiles, the wastewater discharged during the reconstituted tobacco production process can be categorized into three types: high-concentration wastewater, medium-concentration wastewater, and low-concentration wastewater. Medium-concentration wastewater primarily comes from pulp washing water during the pulping process and white water generated during the sheet base papermaking process. It is characterized by continuous discharge, high water volume, low COD, high suspended solids content, high color, and high nicotine content. Low-concentration wastewater, primarily condensed water from evaporation, contains a high concentration of tobacco aroma components and Maillard reaction products produced during high-temperature concentration of the extract, such as benzyl alcohol, 3-oxo-α-ionol, butyrolactone, and megastigmatrienone. These tobacco aroma components are crucial to the sensory quality of cigarettes, primarily affecting the aroma quality and concentration. Medium-concentration and low-concentration wastewater are the primary sources of wastewater discharge. Wastewater discharge not only results in the loss of tobacco aroma components but also increases the wastewater treatment load. Therefore, recovering tobacco aroma components from reconstituted tobacco production wastewater not only achieves efficient resource utilization but also reduces the wastewater treatment load.

[0003] The invention patent with authorization announcement number CN113498875B discloses "A method and application for recovering aroma substances in concentrated white water of reconstituted tobacco leaves". It uses a ceramic microfiltration membrane to purify white water, and uses two macroporous resins of different polarities connected in series to recover aroma substances in the purified white water. Due to the large amount of impurities in the white water, directly using membrane purification equipment to remove impurities will cause the membrane flux to drop rapidly during operation. Although the membrane flux can be restored to the initial level after drug washing, frequent flushing will directly affect its continuity and stability of use. In addition, the resin has the characteristics of selective adsorption. This method cannot completely recover the aroma substances in the wastewater, and the resin enriched components per unit mass are relatively small, the amount of white water treated is low, and the investment cost is high.

[0004] The invention patent with the authorization announcement number CN112499807B discloses "A method for recovering aroma components from papermaking wastewater, a retained concentrate formed thereby, and its use." It utilizes filtration, flocculation sedimentation, microfiltration, and ultrafiltration to purify papermaking wastewater, and then uses a reverse osmosis membrane to enrich the aroma components. Papermaking white water contains a large amount of calcium carbonate. This process uses multi-stage membrane purification, and the equipment investment and operating costs are high. Although it can ensure the operational stability of the membrane purification equipment, it cannot completely remove the calcium carbonate dissolved in the water. When the reverse osmosis membrane enriches the aroma components, the calcium carbonate will accumulate on the surface of the reverse osmosis membrane to form fine particles, which makes the membrane pore size smaller and reduces the flux and separation efficiency of the reverse osmosis. In addition, the retained concentrate obtained by reverse osmosis concentration has a low concentration. In addition to affecting storage and transportation, it also requires a large amount during use, which will increase production energy consumption.

[0005] The invention patent with authorization announcement number CN113455694B discloses the "Recycling and Reuse System for Concentrated Evaporated Condensate Water of Reconstituted Tobacco Leaves by the Papermaking Method", which reuses the concentrated evaporated condensate water for extraction and dilution and concentration of dry materials after extraction and squeezing. Although it can improve the sensory quality of the product to a certain extent, when the concentrated evaporated condensate water is directly reused in these processes, the resulting semi-finished product still needs to go through pulping, screen forming, coating and drying processes, and only a small part of the flavor components are retained in the product. In addition, reusing the concentrated evaporated condensate water for online pulp cannot achieve the purpose of improving the customized quality of the product.

[0006] Therefore, it is necessary to optimize and improve the recovery method of tobacco flavor components in reconstituted tobacco production wastewater to increase the recovery rate of flavor components. Summary of the Invention

[0007] In response to the above technical problems, the present invention provides a method for enriching and separating flavor components from reconstituted tobacco production wastewater. This method is simple and low-cost, producing an enriched separation solution high in nicotine and tobacco flavor components, specifically enhancing the strength and aroma quality of cigarette products. The enriched separation solution contains the vast majority of tobacco flavor components in the wastewater, and the enriched separation solution is highly stable and has a long shelf life.

[0008] To achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A method for enriching and separating aroma components in reconstituted tobacco production wastewater comprises the following steps: subjecting medium-concentration wastewater of reconstituted tobacco to multi-stage purification treatment and low-concentration wastewater to primary purification treatment; using a reverse osmosis membrane to respectively concentrate the two purified liquids to obtain a high-nicotine retained liquid and a high-aroma retained liquid; and recombining the high-nicotine retained liquid and the high-aroma retained liquid, subjecting the mixture to a freeze-thaw and centrifugation process to obtain an enriched separation liquid with high tobacco aroma components.

[0010] The specific steps include:

[0011] 1) Purification of medium-concentration wastewater: The medium-concentration wastewater from the reconstituted tobacco production wastewater is subjected to atmospheric filtration, centrifugal filtration, pressure filtration, and acidification treatment in sequence to obtain a medium-concentration purified liquid;

[0012] 2) Low-concentration wastewater purification: The low-concentration wastewater from the reconstituted tobacco production wastewater is filtered through filter paper or centrifuged to obtain a low-concentration purified liquid;

[0013] 3) Reverse osmosis: The medium-concentration purified liquid obtained in step 1) and the low-concentration purified liquid obtained in step 2) are respectively subjected to reverse osmosis concentration treatment to obtain a medium-concentration retentate and a low-concentration retentate, respectively, with the concentration ratio being 20 to 200 times;

[0014] 4) Freeze-thaw: Mix the medium-concentration retentate and the low-concentration retentate in a certain proportion to obtain a mixed retentate, freeze the mixed retentate at a temperature of -20°C to -10°C, take out the retentate after it is completely frozen, thaw it at room temperature (25±5°C), and collect it to obtain a high-concentration recovered liquid;

[0015] 5) Enrichment and separation: Centrifuge or filter to remove the precipitate in the high-concentration recovery liquid, and the supernatant obtained is the enriched separation liquid with high tobacco aroma components.

[0016] Specifically, in step 1), the medium-concentration wastewater of the reconstituted tobacco production wastewater comes from the pulp washing wastewater of the pulping process or the white water of the papermaking process.

[0017] Specifically, in step 1), the atmospheric pressure filtration uses one or a combination of a curved screen and a fine mesh filter to remove large suspended solids such as long fibers.

[0018] Specifically, in step 1), a horizontal screw centrifuge or a disc centrifuge is selected for centrifugal filtration, which can remove suspended matter and impurities such as solid calcium carbonate and fine fibers in the wastewater.

[0019] Specifically, in step 1), pressure filtration is performed by selecting one or a combination of pressure filter or membrane purification filtration equipment, wherein the filter medium of the pressure filter is one of natural quartz sand and manganese sand; membrane purification can adopt one or a combination of ultrafiltration and nanofiltration; pressure filtration is used to remove larger suspended solids and colloids such as solid calcium carbonate in wastewater.

[0020] Specifically, in step 1), the acidification treatment is to add 0.4‰ to 2‰ (relative to the mass of the filtrate) of an organic acid to adjust the pH of the filtrate to 5.1 to 6.0. The organic acid can be one or more of oxalic acid, succinic acid, malic acid, citric acid, and benzoic acid. The purpose of acidification is, firstly, to decompose water-soluble calcium carbonate, and secondly, to improve the sensory evaluation quality of the final enriched separated liquid, while also improving the stability of nicotine, preventing nicotine from being converted into nornicotine or other components during subsequent storage, and extending the storage time of the enriched separated liquid.

[0021] Specifically, in step 2), the low-concentration wastewater of the reconstituted tobacco production wastewater comes from the concentrated evaporation condensate of the concentration process.

[0022] Specifically, in step 3), reverse osmosis treatment produces a retentate and a permeate, wherein the retentate retains most of the tobacco aroma components in the wastewater, and the permeate is a relatively clean clear liquid that can replace clean water in the tobacco leaf regeneration process; in step 3), the pressure during reverse osmosis concentration is 0.6 to 1.2 MPa.

[0023] Specifically, in step 4), the mixing ratio of the medium-concentration retentate and the low-concentration retentate is 0.5:1 to 1:20 (volume ratio); collection begins upon melting, and the collected volume (volume) is 15% to 20% of the volume (volume) of the liquid before freezing; the concentration of nicotine and other tobacco flavor components in the collected high-concentration recovered liquid is 3 to 4 times higher than that of the reverse osmosis retentate;

[0024] Furthermore, other tobacco flavor components include acetoin, phenylethyl alcohol, 2-acetylpyrrole, benzyl alcohol, dihydroactinol, furfural, solanone, butyrolactone, phenylacetaldehyde, 3-oxo-α-ionol, 3-(4,8,12-trimethyltridecyl)furan, hydroxyacetone, 4-cyclopentene-1,3-dione, 2(3H)-furanone, 4-oxoisophorone, benzaldehyde, methyl palmitate, palmitic acid, 3-hydroxy-β-damascenone, 2-methyl-3-pentanol, benzoic acid, (E)-5-isopropyl-8-hydroxy-8-methyl-6-nonen-2-one, ethyl maltol, 1 -penten-3-one, 3-ethyl-4-methyl-pyrrole-2,5-dione, 3-oxo-α-ionone, γ-octalactone, γ-caprolactone, 2-hydroxy-3-pentanone, megastigmatrienone, 2-butylcyclohexanone, phenylethyl formate, bread ketone, isophorone, 2-acetylfuran, maltol, 2,5-hexanedione, 3-methyl-2(5H)-furanone, phenylacetic acid, hexahydrofarnesyl acetone, β-damascenone, 2-ethylbutyric acid, 2,2,6-trimethyl-1,4-cyclohexanedione, isocetyl alcohol, geranylacetone, dimethylmaleic anhydride, β-damascenone, linalool and the like. Specifically, in step 5), the centrifugal speed is 3000 r / min to 10000 r / min, and the centrifugal time is 3 min to 20 min.

[0025] Specifically, the precipitate in step 5) is mainly formed by water-soluble substances such as proteins dissolved in the production wastewater and substances such as calcium salts formed by regulating with organic acids. Freezing can precipitate water-soluble proteins, calcium salts and other substances.

[0026] Furthermore, based on a general inventive concept, the present invention also provides the use of the enriched separation liquid in cigarettes.

[0027] Specifically, applying the enriched separation liquid to the coating liquid of reconstituted tobacco leaves, flavoring of traditional cigarettes, or the slurry preparation for producing heat-not-burn cigarettes by the thick slurry method can improve the aroma and strength of the product's sensory quality.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a simple and efficient method for enriching and separating flavor components from reconstituted tobacco production wastewater. This method can enrich the vast majority of tobacco flavor components in reconstituted tobacco production wastewater, improving the recovery rate of tobacco flavor components. The recovered materials can be used in products such as reconstituted tobacco, traditional cigarettes, and heat-not-burn cigarettes, enhancing the sensory quality and flavor. At the same time, wastewater discharge is significantly reduced, demonstrating excellent process adaptability and potential for widespread adoption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a graph of the main volatile tobacco aroma components in concentrated evaporated condensate and white water detected by GC chromatography;

[0031] Figure 2 The present invention is a flowchart of the color change of a product obtained by the method for enriching and separating flavor components in reconstituted tobacco production wastewater. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the following will provide a more comprehensive and detailed description of the present invention in conjunction with the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0033] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0034] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0035] Example 1

[0036] A method for enriching and separating aroma components in reconstituted tobacco production wastewater, comprising the following specific steps:

[0037] 1) Medium-consistency wastewater purification: The white water from the papermaking section is filtered through a curved screen at normal pressure to remove large suspended solids such as long fibers in the wastewater, obtaining a filtrate with a suspended solids content (mass percentage) reduced from 0.32% to 0.20%;

[0038] The filtrate treated by the curved screen is then passed through a horizontal screw centrifuge to remove fine fibers and larger-sized calcium carbonate and other suspended matter and impurities in the filtrate, and the suspended matter content is reduced to 0.06%.

[0039] The filtrate treated by the decanter centrifuge was purified and filtered through an ultrafiltration membrane (specifically, a SiC ultrafiltration membrane with a pore size of 70 nm) and did not contain suspended matter. The calcium ion content in the treated filtrate was 310 mg / L.

[0040] The main volatile aroma component in the filtrate after multi-stage filtration is nicotine. It also contains small amounts of tobacco volatile aroma components such as dihydroactin, megastigmatrienone, 3-hydroxy-β-damascenone, and 3-oxo-α-ionone. At this time, 0.6‰ (relative to the mass of the filtrate) of oxalic acid is added for acidification. The pH after treatment is 5.07, and acidified white water is obtained. The nicotine salt in the acidified white water is mainly nicotine oxalate salt. The concentration of nicotine oxalate salt is 64.8 mg / L as determined by high performance liquid chromatography. Nicotine accounts for 94% of the total volatile aroma components.

[0041] 2) Low-concentration wastewater purification: The concentrated evaporated condensate is filtered through filter paper to remove solids such as iron filings and scale on the pipe wall in the condensate to obtain purified condensate;

[0042] The main volatile aroma components of the purified condensate are acetoin, phenylethanol, 2-acetylpyrrole, benzyl alcohol, dihydroactinol, furfural, solanone, butyrolactone, phenylacetaldehyde, 3-oxo-α-ionol, 3-(4,8,12-trimethyltridecyl)furan, hydroxyacetone, 4-cyclopentene-1,3-dione, 2(3H)-furanone, 4-oxoisophorone, benzaldehyde, methyl palmitate, palmitic acid, 3-hydroxy-β-damascenone, 2-methyl-3-pentanol, benzoic acid, (E)-5-isopropyl-8-hydroxy-8-methyl-6-nonen-2-one, ethyl maltol, 1-penten-3-one, 3-ethyl-4- Tobacco volatile aroma components such as methyl-2,5-pyrrole-2,5-dione, 3-oxo-α-ionone, γ-octalactone, γ-caprolactone, 2-hydroxy-3-pentanone, megastigmatrienone, 2-butylcyclohexanone, phenylethyl formate, bread ketone, isophorone, 2-acetylfuran, maltol, 2,5-hexanedione, 3-methyl-2(5H)-furanone, phenylacetic acid, hexahydrofarnesyl acetone, β-damascenone, 2-ethylbutyric acid, 2,2,6-trimethyl-1,4-cyclohexanedione, isocetyl alcohol, geranylacetone, dimethylmaleic anhydride, β-damascenone, and linalool, with concentrations ranging from 36 mg / L to 730 mg / L;

[0043] 3) Reverse Osmosis: The acidified white water and the purified condensed water were respectively subjected to reverse osmosis concentration at an operating pressure of 0.8 MPa to obtain an acidified white water retentate (i.e., a white water reverse osmosis concentrate), a purified condensed water retentate (i.e., a condensed water reverse osmosis concentrate), and a permeate. The white water reverse osmosis concentrate was concentrated 40 times. (At the same time, white water that had not been acidified with oxalic acid was directly subjected to reverse osmosis treatment as a control group. Testing showed that the reverse osmosis of this embodiment increased the concentration by 21% compared to purified white water without the addition of oxalic acid.) The nicotine concentration in the obtained retentate reached 1539.6 mg / L. The condensed water reverse osmosis concentrate was concentrated 50 times. The pore size of the reverse osmosis membrane was 0.1 nm. The retentate retained the vast majority of tobacco flavor components in the wastewater. The permeate was a relatively clean supernatant that could replace clean water in the tobacco leaf regeneration process. Figure 1 To concentrate the main volatile tobacco aroma components in evaporated condensed water and white water, it can be seen that the tobacco aroma components in concentrated evaporated condensed water are more than those in white water. The tobacco aroma components in the former play an important role in the aroma volume and concentration of cigarette products. The main component of white water is nicotine, which is crucial to the strength of cigarettes.

[0044] 4) Freeze-thaw: Mix the white water reverse osmosis concentrate and the condensed water reverse osmosis concentrate in a volume ratio of 0.5:1. Record the volume of the mixed reverse osmosis concentrate as V1. Freeze the mixed reverse osmosis concentrate at -16°C. After the liquid is completely frozen, take it out and thaw it naturally at room temperature (25±5°C). Collect the thawed liquid as soon as it starts to thaw. The final collected volume is calculated to be 20% of the volume before freezing. This part of the liquid is called high-concentration recovery liquid;

[0045] 5) Enrichment and separation: The high-concentration recovered liquid was centrifuged at 8000 r / min for 10 min to enrich the recovered liquid. The precipitate in the high-concentration recovered liquid was removed. The resulting supernatant was the enriched separation liquid containing high tobacco aroma components. The concentration and recovery rate of the main tobacco aroma components in the enriched separation liquid are shown in Table 1 below.

[0046] Table 1

[0047]

[0048]

[0049] Note: Recovery rate is the recovered mass of each flavor component relative to the mass of each flavor component in the purified liquid before reverse osmosis.

[0050] The main nicotine salt in the enriched separation liquid is nicotine oxalate, with a concentration of 5542.7 mg / L, a nicotine recovery rate of 64.8%, and a calcium ion content of 291 mg / L. Figure 2 is a flow chart of the method of the present invention, Figure 2 The percentages in the above table refer to the volume ratio of the collected liquid to the volume of the liquid before freeze concentration. Figure 2 It can be seen that after the implementation of this process, the production wastewater can be concentrated to a high concentration. The use of reverse osmosis concentration and freeze concentration can maintain the activity of the original flavor components of tobacco to the greatest extent, while avoiding the loss of low-boiling point components and the occurrence of side reactions during evaporation and concentration.

[0051] Application Example 1

[0052] The present invention also provides the use of the enriched separation liquid in cigarettes, which specifically comprises the following steps:

[0053] The enriched separation liquid was used as the test group, and the white water recovery solution without organic acid was used as the control group. Both were added to heat-not-burn cigarettes at an addition amount of 2% (relative to the mass of the heat-not-burn cigarette core material). Smoking evaluation (sensory evaluation) was carried out in accordance with the "YC / T497-2014 Sensory Evaluation Method for Chinese Cigarette Style".

[0054] The results show that the enriched separation liquid obtained in the present application contains a variety of important tobacco flavor components and nicotine that significantly enhances the strength. The organic acid is mainly added oxalic acid, and also contains a small amount of organic acids such as 2-ethylbutyric acid, benzoic acid, phenylacetic acid, and palmitic acid contained in the tobacco itself. After applying it to cigarette products, the natural tobacco aroma increases, the smoke concentration increases, the strength increases, the oral irritation decreases, the aftertaste is slightly improved, and the total sensory evaluation score increases by 1.5 points compared with the control group. Compared with the control group (the white water recovery solution without organic acid is applied to the cigarette product), the aroma and oral irritation of the product can be significantly improved.

[0055] In addition, after the enrichment separation liquid was stored at room temperature for 6 months, it was tested that the nicotine concentration in the enrichment separation liquid was still maintained above 5250 mg / L, showing good stability.

[0056] Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the specific embodiments described herein and may include numerous other effective embodiments without departing from the spirit of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A method for enriching and separating aroma components in reconstituted tobacco production wastewater, characterized in that: The steps include: 1) Purification of medium-concentration wastewater: The medium-concentration wastewater from the reconstituted tobacco production process is subjected to atmospheric filtration, centrifugal filtration, pressure filtration, and acidification treatment in sequence to obtain a medium-concentration purified liquid; 2) Low-concentration wastewater purification: The low-concentration wastewater from the reconstituted tobacco production wastewater is filtered through filter paper or centrifuged to obtain a low-concentration purified liquid; 3) Reverse Osmosis: The medium-concentration purified liquid obtained in step 1) and the low-concentration purified liquid obtained in step 2) are respectively subjected to reverse osmosis concentration treatment to obtain a medium-concentration retentate and a low-concentration retentate, respectively, with a concentration ratio of 20 to 200 times; 4) Freeze-thaw: Mix the medium-concentration retentate and the low-concentration retentate in a certain proportion to obtain a mixed retentate. Freeze the mixed retentate at -20°C to -10°C. After the retentate is completely frozen, remove it, thaw it at room temperature, and collect it to obtain a high-concentration recovered liquid. 5) Enrichment and separation: Centrifuge or filter to remove the precipitate in the high-concentration recovery liquid. The supernatant obtained is the enriched separation liquid with high tobacco aroma components; In step 1), the medium-concentration wastewater of the reconstituted tobacco production wastewater comes from the white water of the papermaking process; In step 1), the acidification treatment is to add 0.4‰ to 2‰ of organic acid relative to the mass of the filtrate to adjust the pH of the filtrate to 5.1 to 6.0, and the organic acid is oxalic acid; In step 2), the low-concentration wastewater of the reconstituted tobacco production wastewater comes from the concentrated evaporation condensate in the concentration process; In step 3), the pressure during reverse osmosis concentration is 0.6~1.2Mpa; In step 3), the nicotine concentration in the obtained medium-concentration retentate reaches 1539.6 mg / L; the concentration ratio of the low-concentration retentate is 50 times, and the pore size of the reverse osmosis membrane is 0.1 nm; In step 4), the volume ratio of the medium-concentration retentate to the low-concentration retentate is 0.5:1 to 1:20; collection begins upon thawing, and the collected volume is 15% to 20% of the volume of the liquid before freezing; the concentration of nicotine and other tobacco flavor components in the collected high-concentration recovered liquid is 3 to 4 times higher than that of the reverse osmosis retentate; The main nicotine salt in the enriched separation liquid is nicotine oxalate, with a concentration of 5542.7 mg / L, a nicotine recovery rate of 64.8%, and a calcium ion content of 291 mg / L.

2. The method for enriching and separating flavor components in reconstituted tobacco production wastewater according to claim 1, characterized in that: The main volatile aroma components of the low-concentration purified liquid are acetoin, phenylethyl alcohol, 2-acetylpyrrole, benzyl alcohol, dihydroactinol, furfural, solanone, butyrolactone, phenylacetaldehyde, 3-oxo-α-ionol, 3-(4,8,12-trimethyltridecyl)furan, hydroxyacetone, 4-cyclopentene-1,3-dione, 2(3H)-furanone, 4-oxoisophorone, benzaldehyde, methyl palmitate, palmitic acid, 3-hydroxy-β-damascenone, 2-methyl-3-pentanol, benzoic acid, (E)-5-isopropyl-8-hydroxy-8-methyl-6-nonen-2-one, ethyl maltol, 1-penten-3-one, 3-ethyl-4 -Methyl-pyrrole-2,5-dione, 3-oxo-α-ionone, γ-octalactone, γ-caprolactone, 2-hydroxy-3-pentanone, megastigmatrienone, 2-butylcyclohexanone, phenylethyl formate, bread ketone, isophorone, 2-acetylfuran, maltol, 2,5-hexanedione, 3-methyl-2(5H)-furanone, phenylacetic acid, hexahydrofarnesyl acetone, β-damascenone, 2-ethylbutyric acid, 2,2,6-trimethyl-1,4-cyclohexanedione, isocetyl alcohol, geranylacetone, dimethylmaleic anhydride, β-damascenone, and linalool are volatile aroma components of tobacco, with concentrations ranging from 36 mg / L to 730 mg / L.

3. The method for enriching and separating flavor components in reconstituted tobacco production wastewater according to claim 1, characterized in that: In step 5), the centrifugal speed is 3000 rpm to 10000 rpm, and the centrifugal time is 3 min to 20 min.

4. Use of the enriched separation liquid obtained by the method according to any one of claims 1 to 3 in cigarettes.

5. The use according to claim 4, characterized in that Applying the enriched separation liquid to reconstituted tobacco leaf coating liquid, traditional cigarette flavoring, or the slurry preparation for producing heat-not-burn cigarettes using the thick slurry method can improve the aroma and strength of the product's sensory quality.

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