Method for extracting tobacco extract through microwave dry distillation

Abstract

The invention discloses a method for extracting a tobacco extract through microwave destructive distillation, and belongs to the technical field of tobacco extracts. The microwave dry distillation equipment comprises microwave equipment 1 ', a condenser 1, a condenser 2, a receiving bottle 8 and a receiving bottle 9, the microwave equipment is connected with the condenser 1 and the condenser 2 through a three-way valve, and an air inlet of the three-way valve is connected with an air outlet of the microwave equipment; the condenser 1 is provided with an air inlet electromagnetic valve switch 4 and a pressure detection device 6; the condenser 2 is provided with an air inlet electromagnetic valve switch 5 and a pressure detection device 7; the tail end of the condenser 1 is connected with a receiving bottle 9; and the tail end of the condenser 2 is connected with a receiving bottle 8. The equipment is used for extracting the tobacco extract through microwave destructive distillation, the extraction efficiency is high, and the quality of the tobacco extract is remarkably improved. The obtained tobacco extract is rich in aroma components, and when the tobacco extract is used for preparing low-temperature cigarettes, the low-temperature cigarettes are prominent in smoke aroma and rich in baking aroma.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco extracts, and in particular to a method for extracting tobacco extracts by microwave dry distillation. Background Art

[0002] The extraction methods of tobacco extract mainly include the following:

[0003] Drying and crushing: First, the tobacco raw materials are dried and crushed to obtain tobacco powder.

[0004] Ultrasonic water washing: The tobacco powder is ultrasonically washed with deionized water for 1 to 3 times, and after each ultrasonic water washing, it is filtered and centrifugally dehydrated in sequence to obtain a water-washed residue.

[0005] Drying low-nicotine tobacco powder: drying the washed residue to obtain low-nicotine tobacco powder.

[0006] Carbon dioxide supercritical extraction: low-nicotine tobacco powder is subjected to one or two carbon dioxide supercritical extractions to obtain a primary extract or a secondary extract. The temperature of the secondary carbon dioxide supercritical extraction is 80-100°C and the pressure is 20-30MPa.

[0007] Combined extracts: Combine the primary extract and the secondary extract to obtain a tobacco extract.

[0008] Each of the above methods has its own advantages and disadvantages and is suitable for different production needs. For example, ultrasonic water washing can effectively remove impurities in tobacco, while supercritical carbon dioxide extraction can extract the effective ingredients in tobacco. However, the yield of tobacco extracts obtained by the above methods is average, the concentration of flavor components is not high, the aroma is bland, and the quality is not high. Microwave distillation is a chemical process that uses microwave energy to heat and decompose organic matter in an oxygen-deficient or extremely low-oxygen environment. This technology can convert organic matter into gas, liquid or solid products, and control the distribution of products by adjusting temperature conditions. The working principle of microwave distillation mainly involves the following steps: (1) Pyrolysis: During the distillation process, organic matter is heated to a high temperature environment. The high temperature will break the chemical bonds inside the organic matter, thereby producing pyrolysis products. (2) Repolymerization: The free radicals formed by the breakage of organic molecules undergo a polymer reaction to form larger molecules. (3) Gasification: The repolymerization products are further heated and decomposed into smaller molecules to form gas and liquid products.

[0009] The main advantages of microwave retorting technology include the ability to achieve a high drying effect in a relatively short time, while reducing the quality loss of materials caused by long-term exposure to high temperatures. This technology is widely used in urban heating and other fields. Through technical cost analysis and operating cost comparison, its return on investment and economic feasibility are evaluated. It is also used for pyrolysis of coal to separate high value-added products such as tar, semi-coke, and coal gas, to achieve harmless and reduced processing of coal resources, and to solve the problems of low calorific value of low-quality coal and high combustion pollution.

[0010] Therefore, it is of great significance to study and develop a method for preparing tobacco extract by microwave dry distillation to solve the above-mentioned tobacco extract extraction problem. Summary of the invention

[0011] In view of this, the technical problem to be solved by the present invention is to provide a method for extracting tobacco extract by microwave dry distillation. The tobacco extract prepared by the method has a high yield, a high concentration of flavor components, a prominent natural aroma, and a rich roasted aroma.

[0012] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0013] The present invention provides a microwave retorting device, comprising a microwave device, a condenser 1, a condenser 2, a receiving bottle 8, and a receiving bottle 9;

[0014] The microwave device and condenser 1 and condenser 2 are connected via a three-way valve, and the air inlet of the three-way valve is connected to the air outlet of the microwave device;

[0015] The condenser 1 is provided with an air intake solenoid valve switch 4 and a pressure detection device 6;

[0016] The condenser 2 is provided with an air intake solenoid valve switch 5 and a pressure detection device 7;

[0017] The end of the condenser 1 is connected to a receiving bottle 9;

[0018] The end of the condenser 2 is connected with a receiving bottle 8 .

[0019] The present invention also provides a method for extracting tobacco extract by microwave dry distillation, comprising the following steps:

[0020] Mixing the finished tobacco or tobacco powder with a solvent, adjusting the moisture content to 10%-60%, controlling the temperature to 100°C-130°C, and extracting the tobacco extract using the microwave dry distillation equipment according to claim 1;

[0021] When the pressure is less than 2 atmospheres, heat to 130°C-240°C for microwave dry distillation extraction. When the pressure is greater than 2 atmospheres, stop heating.

[0022] The solvent is selected from propylene glycol and / or glycerol.

[0023] Preferably, in the present invention, the mass ratio of the finished tobacco shreds or tobacco powder to the solvent is 1:(0.1-1); more preferably 1:(0.5-0.8); further preferably 1:0.5 or 1:0.8.

[0024] Preferably, the solvent is selected from propylene glycol and 20%-100% glycerol;

[0025] Preferably, the mass ratio of the propylene glycol to 20%-100% glycerol is 1:(2-5); more preferably 1:4.

[0026] The present invention also provides a tobacco extract prepared by the above method.

[0027] The present invention also provides a low-temperature cigarette, comprising the above tobacco extract.

[0028] Compared with the prior art, the microwave retorting device provided by the present invention comprises a microwave device, a condenser 1, a condenser 2, a receiving bottle 8, and a receiving bottle 9; the microwave device and the condenser 1 and the condenser 2 are connected through a three-way valve, and the air inlet of the three-way valve is connected to the air outlet of the microwave device; the condenser 1 is provided with an air inlet solenoid valve switch 4 and a pressure detection device 6; the condenser 2 is provided with an air inlet solenoid valve switch 5 and a pressure detection device 7; the end of the condenser 1 is connected to a receiving bottle 9; the end of the condenser 2 is connected to a receiving bottle 8. The device is used to extract tobacco extract by microwave retorting, the extraction efficiency is high, and the quality of the tobacco extract is significantly improved. The extract obtained by the present invention is rich in aroma components, and the tobacco extract is used to prepare low-temperature cigarettes, so that the smoke of the low-temperature cigarettes has a prominent original aroma and rich baking aroma. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of microwave dry distillation equipment of the present invention, wherein 1' is a microwave device, 1 is a condenser 1, 2 is a condenser 2, 3 is a three-way valve, 4 is an air intake solenoid valve, 5 is an air intake solenoid valve, 6 is a pressure detection device, 7 is a pressure detection device, 8 is a receiving device, and 9 is a receiving device. DETAILED DESCRIPTION

[0030] To further illustrate the present invention, the method for extracting tobacco extract by microwave dry distillation provided by the present invention is described in detail below in conjunction with examples.

[0031] The production equipment used in the following embodiments is as follows Figure 1 shown.

[0032] The pressure is controlled to be no more than 2 atmospheres, and the temperature is raised to 130-240°C for microwave distillation to prepare tobacco essential oil. Due to the existence of pressure, the two condensing devices of the gas path can be switched according to the pressure design, so that the equipment can be produced continuously and the pressure in the material cavity is avoided to be too high. The condenser 1 and the receiving bottle 9 and the solenoid valve 4 and the pressure detection device 6 form a passage system, and the corresponding passage system is composed of the condenser 2 and the receiving bottle 8 and the solenoid valve 5 and the pressure detection device 7. The purpose of setting the limit value of 2 atmospheres is to adjust the pressure between the two passage systems, that is, when one reaches the limit value, the battery valve is closed to limit the pressure from continuing to rise, and the other is opened to release the pressure.

[0033] The specific design is:

[0034] The air inlets of condenser 1 and condenser 2 are connected to three-way valve 3, and the corresponding air inlet solenoid valve switches are solenoid valves 4 and 5, and pressure detection devices 6 and 7 are connected to the solenoid valves respectively. A receiving bottle 9 is connected to the end of condenser 1, and a receiving bottle 8 is connected to the end of condenser 2. The air inlet of three-way valve 3 is connected to the air outlet of the microwave device. When the pressure limit value is set to 2 atmospheres, if solenoid valve 4 is opened and solenoid valve 5 is closed, the high-temperature steam distilled from the microwave device is cooled in condenser 1 and flows into receiving bottle 9; if the steam pressure is not higher than a set pressure in the range of 1-2 atmospheres, solenoid valve 5 is opened and solenoid valve 4 is closed, the high-temperature steam distilled from the microwave device is cooled in condenser 2 and flows into receiving bottle 8; if the steam pressure is higher than 2 atmospheres, the microwave device stops heating.

[0035] Example 1

[0036] Add 20 kg of 70-mesh tobacco powder, 80% propylene glycol (the mass ratio of tobacco powder to propylene glycol is 1:0.8), adjust the water content to 40% (the purpose is to act as a solvent to entrain the aroma through the azeotropic effect), place it in a microwave heating device, heat it to 130°C, stir the material or rotate the device to make the material heated evenly, and the processing time is 20 minutes.

[0037] The pressure was controlled to be no more than 1.5 atmospheres, and the temperature was raised to 240°C for microwave dry distillation to prepare tobacco essential oil. The treatment time was 40 minutes, and 5 kg of tobacco essential oil was obtained by condensing volatiles. The essential oil yield was 25%, which was high and the extraction efficiency was high.

[0038] 1% of the prepared tobacco essential oil was added to a low-temperature cigarette leaf group to prepare a finished product for evaluation. According to the evaluation standard, the low-temperature cigarette smoke had a prominent natural aroma and rich baking aroma.

[0039] Example 2

[0040] Add 20 kg of tobacco shreds, 50% of propylene glycol and glycerol (the mass ratio of the two is 1:4), adjust the moisture to 50%, place it in a microwave heating device, heat it at 130°C, stir the material or rotate the device to make the material heated evenly, and the processing time is 30 minutes.

[0041] The pressure was controlled to be no more than 2 atmospheres, and the temperature was raised to 220°C for microwave dry distillation to prepare tobacco essential oil. The treatment time was 40 minutes, and 8 kg of tobacco essential oil was obtained by condensing volatiles. The essential oil yield was 40%, which was high and the extraction efficiency was high.

[0042] 1% of the prepared tobacco essential oil was added to a low-temperature cigarette leaf group to prepare a finished product for evaluation. Referring to the evaluation standard, the low-temperature cigarette smoke had a prominent natural aroma and rich baking aroma.

[0043] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A microwave retorting device, characterized in that: It includes a microwave device 1', a condenser 1, a condenser 2, a receiving bottle 8, and a receiving bottle 9; The microwave device and condenser 1 and condenser 2 are connected via a three-way valve, and the air inlet of the three-way valve is connected to the air outlet of the microwave device; The condenser 1 is provided with an air intake solenoid valve switch 4 and a pressure detection device 6; The condenser 2 is provided with an air intake solenoid valve switch 5 and a pressure detection device 7; The end of the condenser 1 is connected to a receiving bottle 9; The end of the condenser 2 is connected with a receiving bottle 8 .

2. A method for extracting tobacco extract by microwave dry distillation, characterized in that: The following steps are involved: Mixing the finished tobacco or tobacco powder with a solvent, adjusting the moisture content to 10%-60%, controlling the temperature to 100°C-130°C, and extracting the tobacco extract using the microwave dry distillation equipment according to claim 1; When the pressure is less than 2 atmospheres, heat to 130°C-240°C for microwave dry distillation extraction. When the pressure is greater than 2 atmospheres, stop heating. The solvent is selected from propylene glycol and / or glycerol.

3. The method according to claim 2, characterized in that The mass ratio of the finished tobacco shreds or tobacco powder to the solvent is 1:(0.1-1).

4. The method according to claim 2, characterized in that: The solvent is selected from propylene glycol and 20%-100% glycerol; The mass ratio of the propylene glycol to 20%-100% of glycerol is 1:(2-5).

5. A tobacco extract, characterized in that Prepared by the method described in claim 2 or 3.

6. A low-temperature cigarette, characterized in that: The invention comprises the tobacco extract as claimed in claim 4.

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