Preparation method of reconstituted tobacco based on oxidative cracking technology

Abstract

The invention discloses a preparation method of reconstituted tobacco based on an oxidative cracking technology. The method comprises the following steps: (1) crushing tobacco raw materials to 5-300 meshes; (2) adding a solvent into the crushed tobacco raw material, filling oxygen-containing gas, and carrying out oxidative cracking reaction under certain conditions; (3) after the reaction is finished, separating to obtain a liquid part and a solid part; (4) concentrating the liquid part until the relative density is 1.1-1.4, adding water into the solid part, and defibering and pulping to 5-45 DEG SR; (5) preparing the defibered and pulped solid part into a sheet base; and (6) applying the concentrated liquid part to a film base, and drying to obtain the reconstituted tobacco. According to the method, the tobacco raw materials are processed through the oxidative cracking technology, aroma precursor substances and macromolecular substances in the tobacco raw materials are subjected to the oxidative cracking reaction, more types and quantities of aroma substances are generated, the sensory quality of the obtained reconstituted tobacco is obviously improved, the aroma quality and the aroma amount are obviously improved, and wood gas is obviously reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco, and in particular to a method for preparing reconstituted tobacco leaves based on oxidative cracking technology. Background Art

[0002] Reconstituted tobacco refers to tobacco flakes made from tobacco raw materials such as tobacco leaf fragments, tobacco dust, and tobacco stems produced during the cigarette production process. Reconstituted tobacco is widely used in various types of cigarette products in my country and has become an indispensable and important raw material to support the development of Chinese cigarettes. However, at present, reconstituted tobacco generally has the disadvantages of lack of tobacco aroma, strong irritation, heavy woody smell, obvious burning paper smell, and poor smoke softness, which affect its use effect in cigarette products. Therefore, improving the sensory quality of reconstituted tobacco, especially increasing its tobacco aroma, reducing irritation, and reducing woody smell, thereby improving the usability of reconstituted tobacco, has become an important research topic in this field.

[0003] At present, researchers have adopted various methods to improve the sensory quality of reconstituted tobacco. In patent CN2019114036529, researchers used tobacco powder to carry out Maillard reaction and added the reaction product to the reconstituted tobacco coating liquid to increase the aroma volume and aroma quality of the reconstituted tobacco; patent CN2019111879528 sprayed tobacco powder on the tobacco sheet base to increase the content of tobacco substances in the reconstituted tobacco and reduce the aroma loss rate.

[0004] The oxidative cracking products of the chemical components in tobacco during preparation and smoking are an important source of tobacco aroma. With the help of oxidation technology, the chemical components in tobacco raw materials undergo oxidative cracking, which can generate more aroma substances. Therefore, the development of new reconstituted tobacco leaves using oxidative cracking technology is of great significance for enriching the content of aroma substances in reconstituted tobacco leaves and improving the sensory quality of reconstituted tobacco leaves. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing reconstituted tobacco based on oxidative cracking technology, which improves the sensory quality of reconstituted tobacco by oxidative cracking technology, increases aroma, reduces irritation, and reduces woodiness.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] A method for preparing reconstituted tobacco leaves based on oxidative pyrolysis technology comprises the following steps:

[0008] (1) crushing the tobacco raw material into 5-300 mesh;

[0009] (2) adding a solvent to the crushed tobacco raw material, introducing an oxygen-containing gas, and causing an oxidative cracking reaction under certain conditions;

[0010] (3) after the reaction is completed, separating the liquid portion and the solid portion;

[0011] (4) Concentrating the liquid portion to a relative density of 1.1 to 1.4, adding water to the solid portion and dispersing and beating the solid portion to a slurry of 5 to 45° SR;

[0012] (5) preparing a sheet base from the solid part after pulping;

[0013] (6) The concentrated liquid portion is applied to a sheet base and dried to obtain reconstituted tobacco leaves.

[0014] Preferably, in the above technical solution, in step (1), the tobacco raw material is one or more of tobacco leaves, tobacco stems and tobacco dust.

[0015] Preferably, in the above technical solution, in step (2), the solvent is one or more of water, ethanol, and ethyl acetate, and the mass ratio of the solvent to the tobacco raw material is 5:1 to 20:1.

[0016] Preferably, in the above technical solution, in step (2), the partial pressure of oxygen in the oxygen-containing gas is 0.1-3.0 MPa; the conditions of the oxidative cleavage reaction are: temperature 30-150°C, time 0.5-72 hours, and stirring speed 50-2000 rpm.

[0017] Preferably, in the above technical solution, in step (4), the mass ratio of the solid part to water is 1:3 to 1:10.

[0018] Preferably, in the above technical solution, in step (6), the mass ratio of the concentrated liquid part to the substrate is 10 -3 :1~10 -1 :1.

[0019] A reconstituted tobacco leaf is prepared by the above-mentioned preparation method.

[0020] A cigarette comprising the above-mentioned reconstituted tobacco leaves.

[0021] The above technical solution of the present invention has the following beneficial effects:

[0022] (1) The present invention utilizes oxidative cracking technology to process tobacco raw materials, and the aroma precursors and macromolecular substances in the tobacco raw materials undergo oxidative cracking reactions to generate more types and quantities of aroma substances, and the sensory quality of the obtained reconstituted tobacco leaves is significantly improved, the aroma quality and aroma quantity are significantly improved, and the woody smell is significantly reduced;

[0023] (2) By changing the conditions of the oxidative cracking reaction, the degree of oxidative cracking and product selectivity of the chemical components in the tobacco raw materials change, and the sensory quality characteristics of the reconstituted tobacco leaves can be effectively regulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 This is the GC-MS analysis result of the oxidized tobacco extract in Example 5. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0027] Unless otherwise specified, the following experimental materials were commercially available or obtained through other commercial channels.

[0028] Example 1

[0029] A method for preparing reconstituted tobacco leaves based on oxidative pyrolysis technology comprises the following steps:

[0030] Take 100g of tobacco leaves, grind them using a ball mill, pass them through a 5-mesh sieve, put them into a 2L stainless steel reactor, and add 500g of water into the reactor.

[0031] The reactor was sealed and filled with oxygen-containing gas, the oxygen partial pressure was 3.0 MPa, the mechanical stirring speed was 2000 rpm, and the reaction was started after the temperature was raised to 150°C, and the reaction time was 48 hours.

[0032] After the reaction is completed, centrifugation is performed to obtain a liquid part and a solid part. The liquid part is concentrated to a relative density of 1.1, 4.0 times the mass of water is added to the solid part and the solid part is pulped to 35°SR, the solid part is paper-coated into a sheet base, and the liquid part is applied to the sheet base at 10% of the mass of the sheet base. After drying, reconstituted tobacco leaves are obtained, which are recorded as sample 1.

[0033] Example 2

[0034] A method for preparing reconstituted tobacco leaves based on oxidative pyrolysis technology comprises the following steps:

[0035] Take 100 g of tobacco stems, grind them using a ball mill, pass them through a 50-mesh sieve, put them into a 2L stainless steel reactor, and add 800 g of ethanol into the reactor.

[0036] The reactor was sealed and filled with oxygen-containing gas, the oxygen partial pressure was 2.5 MPa, the mechanical stirring speed was 500 rpm, and the reaction was started after the temperature was raised to 80°C, and the reaction time was 60 h.

[0037] After the reaction, the liquid part and the solid part were obtained by centrifugation, and the liquid part was concentrated to a relative density of 1.3. 3.0 times the weight of water was added to the solid part and the solid part was pulped to 45°SR. The solid part was made into a sheet base, and the liquid part was applied to the sheet base at 2% of the weight of the sheet base. After drying, reconstituted tobacco leaves were obtained, which were recorded as sample 2.

[0038] Example 3

[0039] A method for preparing reconstituted tobacco leaves based on oxidative pyrolysis technology comprises the following steps:

[0040] Take 100 g of tobacco powder, grind it with a ball mill, pass it through a 100-mesh sieve, put it into a 5L stainless steel reactor, and add 1000 g of ethyl acetate into the reactor.

[0041] The reactor was sealed and filled with oxygen-containing gas, the oxygen partial pressure was 2.0 MPa, the mechanical stirring speed was 1000 rpm, and the reaction was started after the temperature was raised to 30°C, and the reaction time was 72 h.

[0042] After the reaction is completed, centrifugation is performed to obtain a liquid part and a solid part. The liquid part is concentrated to a relative density of 1.4, 5.0 times the mass of water is added to the solid part and the solid part is pulped to 25°SR, the solid part is paper-formed into a sheet base, and the liquid part is applied to the sheet base at 0.1% of the mass of the sheet base. After drying, reconstituted tobacco leaves are obtained, which are recorded as sample 3.

[0043] Example 4

[0044] A method for preparing reconstituted tobacco leaves based on oxidative pyrolysis technology comprises the following steps:

[0045] Take 100g of tobacco leaves, grind them using a ball mill, pass them through a 200-mesh sieve, put them into a 5L stainless steel reactor, and add 1500g of water into the reactor.

[0046] The reactor was sealed and filled with oxygen-containing gas, the oxygen partial pressure was 1.0 MPa, the mechanical stirring speed was 50 rpm, and the reaction was started after the temperature was raised to 60°C, and the reaction time was 24 h.

[0047] After the reaction is completed, centrifugation is performed to obtain a liquid part and a solid part. The liquid part is concentrated to a relative density of 1.1, 10.0 times the mass of water is added to the solid part and the solid part is pulped to 5°SR, the solid part is made into a sheet base, and the liquid part is applied to the sheet base at 3% of the mass of the sheet base. After drying, reconstituted tobacco leaves are obtained, which are recorded as sample 4.

[0048] Example 5

[0049] A method for preparing reconstituted tobacco leaves based on oxidative pyrolysis technology comprises the following steps:

[0050] Take 100g of tobacco leaves, grind them with a ball mill, pass them through a 300-mesh sieve, put them into a 5L stainless steel reactor, and add 2000g of ethanol into the reactor.

[0051] The reactor was sealed and filled with oxygen-containing gas, the oxygen partial pressure was 0.1 MPa, the mechanical stirring speed was 100 rpm, and the reaction was started after the temperature was raised to 120°C, and the reaction time was 0.5 h.

[0052] After the reaction is completed, centrifugation is performed to obtain a liquid part and a solid part. The liquid part is concentrated to a relative density of 1.2, 7.0 times the mass of water is added to the solid part and the solid part is pulped to 15°SR, the solid part is paper-made into a sheet base, and the liquid part is applied to the sheet base at 5% of the mass of the sheet base. After drying, reconstituted tobacco leaves are obtained, which are recorded as sample 5.

[0053] The oxidized tobacco extract in Example 5 was tested by GC-MS. The results are as follows: Figure 1 As shown, after the tobacco raw materials are treated by oxidative cracking technology, the types and quantities of small molecule aroma components generated in the liquid part are relatively large, which is beneficial to increasing the content of aroma substances in reconstituted tobacco leaves.

[0054] GC-MS was used to detect the content of volatile aroma components in the reconstituted tobacco leaves prepared in Examples 1-5. The results are shown in Table 1. After the tobacco raw materials were treated by oxidative pyrolysis technology, the total amount of aroma components in samples 1-5 was significantly increased compared with the control samples, among which the content of ketones, alcohols and esters aroma components increased most significantly.

[0055] Table 1 Content of volatile aroma components in reconstituted tobacco leaves based on oxidative pyrolysis technology

[0056]

[0057] The reconstituted tobacco samples obtained in Examples 1-5 were shredded and made into cigarettes, with a cigarette size of (20+64)×24.5mm. After the cigarette samples were balanced in a constant temperature and humidity chamber (temperature 22±1°C, relative humidity 60±2%) for 48 hours, sensory evaluation personnel were organized to evaluate the sensory effects of the cigarette samples, and the single score was the arithmetic mean of the scores of the 7 evaluation personnel. Cigarette samples made from traditional reconstituted tobacco samples were taken as comparison samples. The evaluation results are shown in Table 2. It can be seen that compared with the comparison samples, the sensory quality of the reconstituted tobacco leaves prepared by the present invention is significantly improved, and the indicators such as aroma, burning sensation, dryness and residue are significantly improved, and the impurities are significantly reduced.

[0058] Table 2 Sensory quality evaluation results of reconstituted tobacco leaves based on oxidative pyrolysis technology

[0059] serial number aroma Smoke Miscellaneous gas Burning sensation Dryness Residue Total score Comparison sample 11.0 22.6 11.3 10.6 10.5 10.6 76.6 Sample 1 11.3 22.7 11.6 10.9 10.9 10.8 78.2 Sample 2 11.1 22.6 11.3 10.7 10.6 10.7 77.0 Sample 3 11.4 22.8 11.7 11.0 10.8 10.9 78.6 Sample 4 11.5 22.7 11.5 10.8 10.9 11.0 78.4 Sample 5 11.3 22.9 11.6 10.9 11.0 11.1 78.8

[0060] Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various choices and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is limited by the claims and their equivalents.

Claims

1. A method for preparing reconstituted tobacco based on oxidative pyrolysis technology, characterized in that: The following steps are involved: (1) crushing the tobacco raw material into 5-300 mesh; (2) adding a solvent to the crushed tobacco raw material, introducing an oxygen-containing gas, and causing an oxidative cracking reaction under certain conditions; (3) after the reaction is completed, separating the liquid portion and the solid portion; (4) Concentrate the liquid part to a relative density of 1.1 to 1.4, add water to the solid part and slurry it to 5 to 45°SR; (5) preparing a sheet base from the solid part after pulping; (6) The concentrated liquid portion is applied to a sheet base and dried to obtain reconstituted tobacco leaves.

2. The method for preparing reconstituted tobacco based on oxidative pyrolysis technology according to claim 1, characterized in that: In step (1), the tobacco raw material is one or more of tobacco leaves, tobacco stems and tobacco dust.

3. The method for preparing reconstituted tobacco based on oxidative pyrolysis technology according to claim 1, characterized in that: In step (2), the solvent is one or more of water, ethanol, and ethyl acetate, and the mass ratio of the solvent to the tobacco raw material is 5:1 to 20:

1.

4. The method for preparing reconstituted tobacco based on oxidative pyrolysis technology according to claim 3, characterized in that: In step (2), the partial pressure of oxygen in the oxygen-containing gas is 0.1-3.0 MPa; the conditions of the oxidative cracking reaction are: temperature 30-150° C., time 0.5-72 hours, and stirring speed 50-2000 rpm.

5. The method for preparing reconstituted tobacco based on oxidative pyrolysis technology according to claim 1, characterized in that: In step (4), the mass ratio of the solid part to water is 1:3 to 1:

10.

6. The method for preparing reconstituted tobacco based on oxidative pyrolysis technology according to claim 1, characterized in that: In step (6), the mass ratio of the concentrated liquid portion to the substrate is 10 -3 :1~10 -1 :

1.

7. A reconstituted tobacco leaf, characterized in that: The reconstituted tobacco leaf is prepared by the preparation method according to any one of claims 1 to 4.

8. A cigarette, characterized in that: The cigarette contains the reconstituted tobacco according to claim 7.

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