A method and apparatus for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves.

Abstract

This invention discloses a method and apparatus for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves, relating to the field of waste gas recovery technology. The method includes: passing the exhaust gas of re-dried tobacco leaves through a cyclone separator at a first preset volume for gas-solid separation to obtain pre-purified flue gas; sending the pre-purified flue gas into a collection tower; sending the collecting agent stored in a dilute solution storage tank into a cooler to cool to a first preset temperature, and then transferring it into the collection tower at a second preset volume through a liquid inlet and a liquid distributor; the pre-purified flue gas and the collecting agent undergo countercurrent leaching in the collection tower to obtain purified flue gas and a collecting agent solution containing tobacco aroma substances; passing the purified flue gas through a liquid collection screen to throttle and purify the collecting agent in the purified flue gas, and then venting the flue gas; returning the collecting agent solution containing tobacco aroma substances to the dilute solution storage tank, and then transferring it to a concentrated solution storage tank to obtain a tobacco aroma substance solution. This invention improves tobacco utilization while also being environmentally friendly.

Description

[0001] This invention is a divisional application entitled "A method and system for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves", wherein the parent application number is 202011242762.4 and the application date is 2020.11.10. Technical Field

[0002] This invention relates to the field of waste gas recovery technology, and in particular to a method and apparatus for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves. Background Technology

[0003] The exhaust fumes from re-dried tobacco contain nicotine, neophytadiene, 2,4-di-tert-butylphenol, phytosterol acetate, dodecyl-eicosane, 4-methylundecyl-2-ene, and octaalkyl trifluoroacetate, among other tobacco aroma compounds, which are dispersed into the atmosphere along with the exhaust gases, resulting in resource waste. How to reduce the pollution of the atmospheric environment by re-dried tobacco exhaust fumes while simultaneously increasing the economic value of tobacco is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for collecting tobacco aroma in the exhaust gas of re-dried tobacco leaves, which can effectively collect tobacco aroma substances in re-dried tobacco leaves, reduce environmental pollution, and improve tobacco utilization.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves, comprising:

[0007] The exhaust gas from the re-dried tobacco leaves is flowed through a cyclone separator according to a first preset volume for gas-solid separation to obtain preliminarily purified flue gas.

[0008] The pre-purified flue gas is sent into the collection tower through a gas inlet and a gas distributor.

[0009] The collector stored in the dilute solution storage tank is sent to the cooler and cooled to the first set temperature. Then, it is transferred to the collection tower according to the second preset volume through the liquid inlet and the liquid distributor. The preliminarily purified flue gas and the collector are leached countercurrently in the collection tower to obtain purified flue gas and a collector solution containing tobacco aroma substances.

[0010] The purified flue gas is throttled and purified by a liquid trapping screen to remove the trapping agent from the flue gas, and then the flue gas is discharged.

[0011] The trapping agent solution containing tobacco aroma substances is returned to the dilute solution storage tank;

[0012] The solution in the dilute solution storage tank is transferred to the concentrated solution storage tank using a concentrated solution pump to obtain a tobacco aroma substance solution.

[0013] Optionally, the method further includes:

[0014] The tobacco aroma substance solution is sent to a concentration device for trapping agent separation and cooling to obtain a gas trapping agent and a concentrated tobacco aroma liquid;

[0015] The gas collector in the concentration unit flows into the collector storage tank through the condenser, and then the collector in the collector storage tank is transferred to the dilute solution storage tank by the collector pump.

[0016] The tobacco aroma concentrate in the concentration device flows into the concentrate storage tank, resulting in a concentrated solution of tobacco aroma substances.

[0017] Optionally, the dilute solution storage tank includes a first dilute solution storage tank and a second dilute solution storage tank;

[0018] The method also includes:

[0019] The concentration of the solution in the first dilute solution storage tank was sampled and tested;

[0020] When the concentration reaches the set concentration value, the tee connecting the collection tower to the first dilute solution storage tank and the second dilute solution storage tank is switched, so that the liquid in the collection tower enters the second dilute solution storage tank, while the liquid entering the first dilute solution storage tank is stopped.

[0021] Optionally, the tobacco aroma substance solution is sent to a concentration device for trapping agent separation, specifically including:

[0022] The tobacco aroma substance solution is separated by a trapping agent using vacuum distillation or vacuum rotary evaporation;

[0023] The pressure of the vacuum distillation is 1 kPa to 10 kPa, and the temperature is 30°C to 50°C.

[0024] The vacuum degree of the vacuum rotary evaporation is 1 kPa to 10 kPa, the rotation speed is 30 r / min to 110 r / min, and the temperature is 30℃ to 50℃.

[0025] Optionally, the tobacco aroma substance solution is sent to a concentration device for collector cooling, specifically including:

[0026] The tobacco fragrance substance solution is cooled using a water cooling method;

[0027] The temperature of the water used for water cooling is 5–25℃.

[0028] To achieve the above objectives, the present invention also provides the following technical solutions:

[0029] A device for collecting tobacco aroma in the exhaust gas of re-dried tobacco leaves includes a cyclone separator, a collection tower, a dilute solution storage tank, a circulation pump, a cooler, and a concentrated solution tank.

[0030] The collection tower is equipped with a gas inlet, a gas distributor, a liquid inlet, and a liquid distributor; and the liquid inlet and the liquid distributor are located above the gas inlet and the gas distributor.

[0031] The collection tower, the dilute solution storage tank, the circulating pump, and the cooler are connected in sequence from end to end;

[0032] The cyclone separator is connected to the collection tower;

[0033] The concentrated solution tank is connected to the dilute solution tank.

[0034] Optionally, the apparatus also includes a concentration unit, a concentrate storage tank, a condenser, a collector storage tank, and a vacuum unit;

[0035] The first outlet of the concentration device is sequentially connected to the condenser and the vacuum device;

[0036] The second outlet of the concentration device is connected to the concentrated liquid storage tank;

[0037] The reflux inlet of the concentration device is connected to the trapping agent storage tank.

[0038] Optionally, the collection tower is provided with a packing layer inside the tower body;

[0039] The packing layer is located in the middle of the vertical direction of the trapping tower;

[0040] The number of layers in the filler layer is 1 to 3;

[0041] The filler in the packing layer includes a structured packing layer and / or a random packing layer. The structured packing layer includes PP structured corrugated packing or metal wire mesh corrugated packing, and the random packing layer includes ceramic, resin, macroporous silica gel, activated carbon or metal particle packing.

[0042] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0043] This invention discloses a method and apparatus for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves. The re-dried tobacco exhaust gas is flowed through a cyclone separator at a first preset volume for gas-solid separation to obtain pre-purified exhaust gas. The pre-purified exhaust gas is then fed into a collection tower via a gas inlet and a gas distributor. A collector agent stored in a dilute solution storage tank is cooled to a first preset temperature in a cooler, and then transferred to the collection tower at a second preset volume via a liquid inlet and a liquid distributor. The pre-purified exhaust gas and the collector agent undergo countercurrent leaching in the collection tower to obtain purified exhaust gas and a collector agent solution containing tobacco aroma substances. The purified exhaust gas is then throttled through a liquid collection screen to purify the collector agent in the purified exhaust gas, and then the exhaust gas is vented. The collector agent solution containing tobacco aroma substances is returned to the dilute solution storage tank. A concentrated solution pump is used to transfer the solution from the dilute solution storage tank to the concentrated solution storage tank to obtain a tobacco aroma substance solution. This invention recovers tobacco aroma compounds from the exhaust gas of re-dried tobacco leaves, improving environmental protection while avoiding pollution and enhancing the economic value of tobacco, thus preventing resource waste. The collection method provided by this invention recovers and recycles the collecting agent, generating no waste liquid, waste gas, or solid waste during the collection process, resulting in low collection costs. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A process flow diagram for collecting tobacco aroma substances from the exhaust gas of re-dried tobacco leaves according to the present invention;

[0046] Figure 2 Here is the GC-MS spectrum of the concentrated solution in the concentrated solution storage tank in Example 1:

[0047] Figure 3 The image shows the GC-MS spectrum of the concentrated solution in the concentrated solution storage tank in Example 2.

[0048] Figure 4 The GC-MS spectrum of the concentrate collected in Example 2;

[0049] Figure 5 Here is the GC-MS spectrum of the concentrated solution in the concentrated solution storage tank in Example 3:

[0050] Figure 6 The image shows the GC-MS spectrum of the concentrated solution in the concentrated solution storage tank in Example 4.

[0051] Figure 7 The GC-MS spectrum of the concentrate collected in Example 4;

[0052] Symbol explanation:

[0053] 1 is a gas-solid separator; 1-1 is the exhaust gas inlet; 1-2 is the solid matter outlet; 1-3 is the preliminary purified flue gas outlet; 1-4 is the solid matter collection box; 2 is a collection tower; 2-1 is the gas inlet; 2-2 is the gas distributor; 2-3 is the liquid inlet; 2-4 is the liquid distributor; 2-5 is the packing layer; 2-6 is the liquid collection screen; 2-7 is the liquid outlet; 2-8 is the vent; 17 is a gas chromatograph; 3 is the first dilute solution storage tank; 3-1 is the first inlet; 3-2 is the first filter screen; 3-3 is the second filter screen; 3-4 is the first outlet; 3-5 is the second outlet; 3-6 is the second inlet; 3-7 is the first sampling port; 4 is the second dilute solution storage tank; 4-1 is the third inlet; 4-2 is the third filter screen; 4-3 is... Fourth filter screen, 4-4 is the third outlet, 4-5 is the fourth outlet, 4-6 is the fourth inlet, 4-7 is the second sampling port, 5 is the circulation pump, 6 is the cooler, 7 is the concentrated solution pump, 8 is the concentrated solution storage tank, 8-1 is the concentrated solution storage tank inlet, 8-2 is the concentrated solution storage tank outlet, 9 is the feed pump, 10 is the concentration device, 10-1 is the feed inlet, 10-2 is the first discharge port, 10-3 is the second discharge port, 10-4 is the reflux liquid inlet, 11 is the concentrated solution storage tank, 11-1 is the concentrated solution storage tank inlet, 11-2 is the third sampling port, 12 is the collector storage tank, 12-1 is the collector storage tank inlet, 12-2 is the collector storage tank outlet, 13 is the collector pump, 14 is the condenser, 15 is the vacuum device, and 16 is the heating device. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] To make the objectives, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] This invention provides a method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves, comprising:

[0057] 1) The exhaust gas from the re-dried tobacco leaves is subjected to gas-solid separation to obtain preliminarily purified flue gas;

[0058] 2) The tobacco aroma substances in the preliminarily purified flue gas are captured using a trapping agent to obtain a tobacco aroma substance solution;

[0059] 3) The trapping agent in the tobacco aroma substance solution is recovered to obtain a concentrated solution of tobacco aroma substances.

[0060] This invention performs gas-solid separation on the exhaust gas from re-dried tobacco leaves to obtain preliminarily purified flue gas. In this invention, the gas-solid separation is preferably cyclone separation, and the solid matter separated mainly consists of tobacco leaf and / or tobacco stem fragments, from which valuable components can be extracted.

[0061] In this invention, the preliminarily purified flue gas preferably includes 30 to 170 kinds of tobacco aroma substances, more preferably 47 to 75 kinds of tobacco aroma substances. In the embodiments of this invention, the types of tobacco aroma substances contained are specifically 47, 50, 52 or 75.

[0062] After obtaining the initially purified flue gas, this invention utilizes a trapping agent to trap tobacco aroma substances in the initially purified flue gas, obtaining a tobacco aroma substance solution. The trapping agent preferably includes one or more of the following: aqueous ethanol solution, acetone, dichloromethane, petroleum ether, methanol, ethyl acetate, n-hexane, and water; more preferably, it includes aqueous ethanol solution, acetone, or methanol. When the trapping agent comprises two or more of the above-mentioned substances, there is no particular limitation on the ratio of the various substances, and any ratio can be used. In this invention, the mass concentration of the aqueous ethanol solution is preferably 50-95%, specifically 50% or 95%. The temperature of the trapping agent is controlled at 0-20°C, more preferably 5-15°C. The trapping method is preferably countercurrent leaching.

[0063] In this invention, the trapping preferably includes the following steps:

[0064] 1) The tobacco aroma substances in the preliminarily purified flue gas are captured using a trapping agent to obtain a dilute solution of tobacco aroma substances; 2) The dilute solution of tobacco aroma substances is recycled to capture the tobacco aroma substances in the preliminarily purified flue gas to obtain a tobacco aroma substance solution; the concentration of the tobacco aroma substance solution is 5-20%.

[0065] This invention utilizes a trapping agent to capture tobacco aroma compounds in the pre-purified flue gas, obtaining a dilute solution of tobacco aroma compounds. The preferred volumetric flow rate ratio of the pre-purified flue gas to the trapping agent is 10:1 to 200:1, more preferably 20:1 to 50:1, and even more preferably 25:1 to 30:1. The preferred volumetric flow rate of the pre-purified flue gas is 1 m³ / s. 3 / s~6m 3 / s, more preferably 1.5m 3 / s~4m 3 / s. In this invention, the collection time is preferably 15 min to 90 min, more preferably 30 min to 60 min, and the collection time is the contact time between the initially purified flue gas and the collecting agent during countercurrent leaching.

[0066] After obtaining a dilute solution of tobacco aroma substances, this invention recycles the dilute solution to capture the tobacco aroma substances in the preliminarily purified smoke, resulting in a tobacco aroma substance solution. The concentration of the tobacco aroma substance solution is preferably 5%–20%, more preferably 5%–15%. This invention preferably uses gas chromatography-mass spectrometry (GC-MS) to detect the concentration of solutes in the tobacco aroma substance solution. This invention recycles the dilute solution of tobacco aroma substances to capture the tobacco aroma substances in the preliminarily purified smoke, thus improving the utilization efficiency of the trapping agent.

[0067] After obtaining the tobacco aroma substance solution, the present invention recovers the trapping agent in the tobacco aroma substance solution to obtain a concentrated tobacco aroma substance. In the present invention, the recovery preferably includes separation and cooling performed sequentially; the separation is preferably vacuum distillation or vacuum rotary evaporation, the pressure of the vacuum distillation is preferably 1 kPa to 10 kPa, more preferably 3 kPa to 8 kPa; the temperature is preferably 30℃ to 50℃, more preferably 33℃ to 40℃; the vacuum degree of the vacuum rotary evaporation is preferably 1 kPa to 10 kPa, more preferably 3 kPa to 8 kPa; the rotation speed is preferably 30 r / min to 110 r / min, more preferably 32 r / min to 90 r / min, and even more preferably 33 r / min to 60 r / min; in the present invention, the cooling is preferably water cooling, the temperature of the water used for water cooling is preferably 5℃ to 25℃, more preferably 10℃ to 18℃.

[0068] After obtaining a concentrated solution of tobacco aroma substances, the present invention preferably further separates and purifies the neophytadiene or nicotine in the concentrated solution. The separation and purification method is as follows:

[0069] 1) The concentrated liquid of tobacco aroma substances was subjected to supercritical CO2 extraction to obtain the primary extract;

[0070] 2) Mix the primary extract with an alkaline solution to obtain an alkaline extract;

[0071] 3) The alkaline extract is back-extracted to obtain the oil phase;

[0072] 4) Remove the back-extractant from the oil phase to obtain high-purity tobacco aroma substances;

[0073] 5) The back-extraction agent used for back-extraction is a mixture of petroleum ether and alkanes or petroleum ether.

[0074] The present invention preferably employs molecular distillation, rectification or crystallization methods to separate and purify other components (except neophytadiene or nicotine) in the concentrate, depending on the properties of the components.

[0075] The collection method provided by this invention recovers tobacco aroma substances from the exhaust gas of re-dried tobacco leaves, avoiding environmental pollution and improving environmental friendliness; it also enhances the economic value of tobacco and avoids resource waste. The method provided by this invention recovers and recycles the collecting agent, and no waste liquid, waste gas, or solid waste is generated during the collection of tobacco aroma substances from the exhaust gas of re-dried tobacco leaves, thus reducing collection costs.

[0076] The present invention also provides a system for collecting tobacco aroma in the exhaust gas of re-dried tobacco leaves, including a purification module, a collection module and a concentration module; the purification module includes a gas-solid separator 1; the collection module includes a collection tower 2 and a first storage system; the concentration module includes a concentration device 10 and a second storage system; the gas-solid separator 1, the collection tower 2, the first storage system, the concentration device 10 and the second storage system are connected sequentially.

[0077] In one embodiment of the present invention, the impurity removal module includes a gas-solid separator 1, which is preferably a cyclone separator. The gas-solid separator 1 is capable of removing and collecting solid substances from the exhaust gas of re-dried tobacco leaves.

[0078] As an embodiment of the present invention, the gas-solid separator 1 includes an exhaust gas inlet 1-1, a preliminary purified flue gas outlet 1-3, a solid matter outlet 1-2, and a solid matter collection box 1-4; the exhaust gas inlet 1-1 is located on the upper part of the side wall of the gas-solid separator 1; the preliminary purified flue gas outlet 1-3 is located at the top of the gas-solid separator 1; the solid matter outlet 1-2 is located at the bottom of the gas-solid separator 1; and the solid matter collection box 1-4 is located below the solid matter outlet 1-2, and the solid matter collection box 1-4 is used to collect the solid matter separated by the gas-solid separator 1.

[0079] In one embodiment of the present invention, the collection module includes a collection tower 2, a gas chromatograph 17, and a first storage system. The collection tower 2 includes a gas inlet 2-1, a gas distributor 2-2, a liquid inlet 2-3, a liquid distributor 2-4, a packing layer 2-5, a liquid collection screen 2-6, a liquid outlet 2-7, and an air vent 2-8.

[0080] In one embodiment of the present invention, the liquid collection screen 2-6 is disposed at the top of the cavity of the collection tower 2. The liquid collection screen 2-6 can trap liquid in the flue gas after countercurrent leaching, reducing the loss of the collection agent;

[0081] The vent 2-8 is located at the top of the collection tower 2. The gas after countercurrent leaching is vented through the vent 2-8 of the collection tower. Before venting, the gas after countercurrent leaching is preferably analyzed online by a gas chromatograph 17. When the concentration of tobacco aroma substances in the gas after countercurrent leaching is higher than 3% to 5%, the flow rate of the venting agent is preferably increased to improve the extraction of tobacco aroma substances.

[0082] In one embodiment of the present invention, the gas inlet 2-1 is located at the lower part of the side wall of the collection tower 2; the gas inlet 2-1 is connected to the preliminary purified flue gas outlet 1-3; the gas inlet 2-1 is provided with a gas distributor 2-2; the gas distributor 2-2 is preferably an open type with an opening at the bottom of the pipe; the gas distributor 2-2 facilitates the uniform distribution of the exhaust gas of the re-dried tobacco leaves after gas-solid separation and facilitates full contact with the collection agent.

[0083] In one embodiment of the present invention, the liquid inlet 2-3 is located on the upper part of the side wall of the collection tower 2 and below the horizontal height of the liquid collection screen 2-6. The liquid inlet 2-3 is connected to a liquid distributor 2-4. The liquid distributor 2-4 is preferably a porous distributor, which preferably includes a pipe type, a ring pipe type, or a screen plate type, and more preferably a ring pipe type. The liquid distributor 2-4 can make the collecting agent evenly distributed, which is conducive to sufficient contact with the pre-purified smoke and improves the extraction rate of tobacco aroma substances.

[0084] In one embodiment of the present invention, the packing layer 2-5 is located in the middle of the vertical direction of the collection tower 2, and the number of packing layers 2-5 is preferably 1 to 3; the height of the packing layer 2-5 is preferably 0.5m to 5m, more preferably 1m to 2.5m.

[0085] In this invention, each of the packing layers 2-5 is preferably independently loadable and detachable for easy replacement. The packing layers preferably include a structured packing layer and / or a random packing layer. The structured packing layer preferably includes PP structured corrugated packing or metal wire mesh corrugated packing, and the random packing layer preferably includes ceramic, resin, macroporous silica gel, activated carbon, or metal particle packing. When the packing layer includes both a structured packing layer and a random packing layer, the thickness of the structured packing layer and the random packing layer is preferably 1:1 to 3, more preferably 1:1 to 2. In this invention, the structured packing layer is preferably located above the random packing layer.

[0086] In this invention, the trapping agent is uniformly sprayed onto the surface of the packing layer via the liquid distributor 2-4. The trapping agent flows downwards under gravity and forms a liquid film on the surface of the packing material. This liquid film contacts the rising, initially purified flue gas and dissolves the tobacco aroma compounds in the exhaust gas. Preferably, the bottom of the trapping tower 2 retains a liquid seal solution at a certain height, preferably 0.3m to 0.8m, more preferably 0.35m to 0.5m. This liquid seal solution prevents gas leakage from the liquid outlet 2-7, and is preferably the trapping agent after the tobacco aroma compounds have been captured.

[0087] As an embodiment of the present invention, the first storage system includes a dilute solution storage tank, a circulation pump 5, a concentrated solution pump 7, and a concentrated solution storage tank 8; the collection tower 2, the dilute solution storage tank, and the circulation pump 5 constitute a circulation system; the collection tower 2, the dilute solution storage tank, the concentrated solution pump 7, the concentrated solution storage tank 8, and the concentration device 10 are connected in sequence.

[0088] As an embodiment of the present invention, the dilute solution storage tank includes a first dilute solution storage tank 3 and a second dilute solution storage tank 4; the first dilute solution storage tank 3 and the second dilute solution storage tank 4 are connected in parallel and switched by three-way valves ST-1 and ST-3; a cooler 6 is also provided between the circulating pump 5 and the collection tower 2, and the cooler 6 is connected to the liquid inlet 2-3.

[0089] In this invention, the function of the cooler 6 is to cool the temperature of the trap to below 20°C, more preferably to 5-15°C; lowering the temperature of the trap reduces the volatilization of the trap, thereby improving the trapping efficiency of tobacco aroma substances.

[0090] As an embodiment of the present invention, the first dilute solution storage tank 3 includes a first inlet 3-1, a first filter screen 3-2, a second filter screen 3-3, a first outlet 3-4, a second outlet 3-5, a second inlet 3-6, and a first sampling port 3-7;

[0091] The second dilute solution storage tank 4 includes a third inlet 4-1, a third filter 4-2, a fourth filter 4-3, a third outlet 4-4, a fourth outlet 4-5, a fourth inlet 4-6, and a second sampling port 4-7.

[0092] In one embodiment of the present invention, the liquid outlet 2-7 is connected to the first inlet 3-1 and the third inlet 4-1 respectively via a three-way ST-1; the first outlet 3-4 and the third outlet 4-4 are connected to the circulation pump 5 respectively via a three-way ST-3; and the second outlet 3-5 and the fourth outlet 4-5 are connected to the concentrated solution pump 7 respectively via a three-way ST-2.

[0093] In one embodiment of the present invention, the concentrated solution pump 7 is preferably connected to the inlet 8-1 of the concentrated solution storage tank. The concentrated solution storage tank 8 preferably stores a tobacco aroma substance solution.

[0094] As an embodiment of the present invention, the three-way valve ST-1 between the liquid outlet 2-7 and the first dilute solution storage tank 3 and the second dilute solution storage tank 4 can regulate the liquid flow direction of the bottom of the collection tower 2; specifically, when the solution concentration in the first dilute solution storage tank 3 or the second dilute solution storage tank 4 reaches a certain value, the liquid in the bottom of the collection tower 2 is directed to flow into another dilute solution storage tank by adjusting the three-way valve ST-1, and at the same time, the solution in the dilute solution storage tank with a certain concentration is transferred to the concentrated solution storage tank 8 through the concentrated solution pump 7 from the concentrated solution storage tank inlet 8-1.

[0095] In this invention, the first sampling port 3-7 or the second sampling port 4-7 can provide sampling conditions for detecting the concentration of the solution in the dilute solution storage tank.

[0096] In this invention, the volumes of the first dilute solution storage tank 3 and the second dilute solution storage tank 4 are preferably 1m³ each. 3 ~5m 3 More preferably 2m 3 ~3m 3 The volume of the concentrated solution storage tank 8 is preferably 2m³. 3 ~10m 3 More preferably 4m 3 ~6m 3 .

[0097] In one embodiment of the present invention, the first filter screen 3-2 is disposed at the first outlet 3-4; the third filter screen 4-2 is disposed at the third outlet 4-4; the functions of the first filter screen 3-2 and the third filter screen 4-2 are independently to filter impurities in the solution in the dilute solution storage tank and avoid clogging the circulation pump;

[0098] The second filter screen 3-3 is located at the second outlet 3-5; the fourth filter screen 4-3 is located at the fourth outlet 4-5; the functions of the second filter screen 3-3 and the fourth filter screen 4-3 are independent to filter impurities in the solution in the dilute solution storage tank and prevent clogging of the concentrated solution pump.

[0099] In this invention, the setup of the collection tower 2 and the first storage system ensures that the collection process can be carried out continuously without interruption.

[0100] In one embodiment of the present invention, the concentration module includes a concentration device 10 and a second storage system. The concentration device 10 is connected to the concentrated solution storage tank 8 via a feed pump 9.

[0101] As an embodiment of the present invention, the concentration device 10 includes a feed inlet 10-1, a first discharge outlet 10-2, a second discharge outlet 10-3, and a reflux liquid inlet 10-4. The concentration device 10 is specifically a vacuum distillation column or a vacuum rotary evaporator.

[0102] As an embodiment of the present invention, the concentration device 10 further includes a heating device 16, which preferably includes a steam heating device, a heat transfer oil heating device, or an electric heating device.

[0103] In one embodiment of the present invention, the concentrated solution storage tank outlet 8-2, the feed pump 9, and the feed inlet 10-1 are connected sequentially. A condenser 14 and a vacuum device 15 are installed at the top of the concentration device 10. The first outlet 10-2 is connected sequentially to the condenser 14 and the vacuum device 15. The condenser 14 can condense the gas collector separated by the concentration device 10 into a liquid collector. The vacuum device 15 is connected to the condenser 14 to provide the necessary vacuum conditions for the system.

[0104] As an embodiment of the present invention, the second storage system includes a concentrate storage tank 11, a collector storage tank 12, and a collector pump 13; the collector storage tank 12 includes a collector storage tank inlet 12-1 and a collector storage tank outlet 12-2; the concentrate storage tank 11 includes a concentrate storage tank inlet 11-1 and a third sampling port 11-2.

[0105] In one embodiment of the present invention, the second discharge port 10-3 is connected to the inlet 11-1 of the concentrate storage tank; the condenser 14 is connected to the inlet 12-1 of the collector storage tank and the reflux liquid inlet 10-4 respectively; the outlet 12-2 of the collector storage tank is sequentially connected to the collector pump 13; and the outlet of the collector pump 13 is connected to the second inlet 3-6 and the fourth inlet 4-6 respectively through a tee.

[0106] The main purposes of the reflux setting in this invention are as follows: when the concentration device 10 is a vacuum distillation column, the partial reflux method can increase the concentration of the recovered scavenging agent; when the concentration device 10 is a vacuum rotary evaporator, reflux can condense substances with higher boiling points and return them to the reactor.

[0107] This invention allows the entire system to operate continuously or intermittently, depending on the actual situation. In this invention, the intermittent operation includes performing only gas-solid separation and collection on the re-dried tobacco exhaust gas, without recovering the solution in the concentrated solution storage tank 8, or only recovering the solution in the concentrated solution storage tank 8 without performing gas-solid separation and collection.

[0108] In this invention, the continuous operation is specifically performed according to the following steps:

[0109] The exhaust gas from the re-dried tobacco leaves enters the gas-solid separator 1 through the tail gas inlet 1-1 for gas-solid separation, removing solid substances from the exhaust gas and obtaining pre-purified flue gas.

[0110] The pre-purified flue gas enters the trapping tower 2 through gas inlet 2-1 and gas distributor 2-2. The circulating pump 5 is activated to pump the trapping agent from the first dilute solution storage tank 3 to the cooler 6 for cooling, and then it enters the trapping tower 2 sequentially through liquid inlet 2-3 and liquid distributor 2-4. The pre-purified flue gas and trapping agent undergo counter-current leaching in the packing layer 2-5. The purified flue gas obtained after counter-current leaching passes through the liquid trapping screen 2-6 to throttle the trapping agent in the purified flue gas before being discharged through the exhaust port 2-8. The trapping agent solution containing tobacco aroma substances obtained from counter-current leaching directly enters the first dilute solution storage tank 3. Preferably, this invention controls the outflow rate of the trapping tower 2 by controlling the outflow rate of the trapping agent solution containing tobacco aroma substances obtained from counter-current leaching in the trapping tower 2. Liquid seal; specifically, the initial outlet flow rate is less than the flow rate of the precipitant entering the precipitant tower 2. After the liquid seal is formed, the outlet flow rate is preferably increased to be equal to the flow rate of the precipitant entering the precipitant tower 2. The concentration of the solution in the first dilute solution storage tank 3 is sampled and tested from the first sampling port 3-7. When the concentration reaches 5-20%, the three-way ST-1 connecting the precipitant tower 2 to the first dilute solution storage tank 3 and the second dilute solution storage tank 4 is switched so that the liquid in the bottom of the precipitant tower 2 enters the second dilute solution storage tank 4, while the liquid entering the first dilute solution storage tank 3 is stopped. The liquid in the second dilute solution storage tank 4 is then passed through the cooler 6, liquid inlet 2-3, and liquid distributor 2-4 into the precipitant tower 2 for countercurrent leaching using the circulation pump 5. The solution in the first dilute solution storage tank 3 is transferred to the concentrated solution storage tank 8 using the concentrated solution pump 7.

[0111] The concentrated solution in the concentrated solution storage tank 8 is fed to the concentration unit 10 by the feed pump 9 for collector recovery. The gas collector flows into the collector storage tank 12 through the condenser 14. The tobacco aroma concentrate at the bottom of the concentration unit 10 flows into the concentrate storage tank 11 through the second outlet 10-3 to obtain a concentrated solution of tobacco aroma substances. The recovered collector is transferred to the first dilute solution storage tank 3 through the second inlet 3-6 by the collector pump 13. The concentration of the solution in the second dilute solution storage tank 4 is sampled and tested through the second sampling port 4-7. When the concentration of the solution in the second dilute solution storage tank 4 reaches 5% to 20%, the tee connecting the collection tower 2 to the first dilute solution storage tank 3 and the second dilute solution storage tank 4 is switched so that the liquid in the bottom of the collection tower 2 enters the first dilute solution storage tank. 3. Simultaneously, the flow into the second dilute solution storage tank 4 is stopped. The liquid from the first dilute solution storage tank 3 is fed into the collection tower 2 via the cooler 6, liquid inlet 2-3, and liquid distributor 2-4 using the circulation pump 5 for countercurrent leaching. The solution in the second dilute solution storage tank 4 is transferred to the concentrated solution storage tank 8 using the concentrated solution pump 7. The concentrated solution in the concentrated solution storage tank 8 is sent to the concentration device 10 for collector recovery using the feed pump 9. The gas collector flows into the collector storage tank 12 via the condenser 14. The tobacco aroma concentrate at the bottom of the concentration device 10 flows into the concentrate storage tank 11 through the second outlet 10-3 to obtain a concentrated tobacco aroma substance. The recovered collector is transferred to the second dilute solution storage tank 4 via the fourth inlet 4-6 using the collector pump 13.

[0112] Repeating the above process enables continuous operation of gas-solid separation, capture, and concentration.

[0113] The system provided by this invention collects tobacco aroma substances from the exhaust gas of re-dried tobacco leaves without generating solid, liquid, or gaseous waste, thus improving tobacco utilization while also being environmentally friendly.

[0114] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0115] Figure 1 The process flow diagram for collecting tobacco aroma substances from the exhaust gas of re-dried tobacco leaves is shown in Examples 1-4. Figure 1 The process flow was collected.

[0116] Example 1

[0117] The exhaust gas from re-dried tobacco leaves is 1.5m 3 The volumetric flow rate of the flue gas is 1 / s. The gas and solid substances are separated by the gas-solid separator (cyclone separator) to remove solid substances from the exhaust gas and obtain preliminarily purified flue gas.

[0118] The pre-purified flue gas enters the collection tower 2 through gas inlet 2-1 and gas distributor 2-2 (open at the bottom of the pipe); the circulating pump 5 is turned on to cool the collecting agent (95% ethanol) in the first dilute solution storage tank 3 to 15°C in the cooler 6, and then sequentially through liquid inlet 2-3 and liquid distributor 2-4 (loop type) at a rate of 0.05m... 3 The gas is transferred to the inside of the collection tower 2; the pre-purified flue gas and the collecting agent are leached countercurrently in the packing layer 2-5, wherein the packing material in the packing layer 2-5 is silica gel particles; the gas-liquid volume flow ratio of the pre-purified flue gas and the collecting agent is 30:1; the purified flue gas obtained after countercurrent leaching passes through the liquid collection screen 2-6 to throttle the collecting agent in the purified flue gas and is then discharged through the exhaust port 2-8; the collecting agent solution containing tobacco aroma substances obtained from countercurrent leaching enters the first dilute solution storage tank 3 from the bottom of the collection tower 2; samples are taken and tested from the first sampling port 3-7. When the concentration of the solution in the first dilute solution storage tank 3 reaches 10%, the three-way valve ST-1 connecting the collection tower 2 to the first dilute solution storage tank 3 and the second dilute solution storage tank 4 is switched, allowing the liquid in the bottom of the collection tower 2 to enter the second dilute solution storage tank 4, while stopping the liquid from entering the first dilute solution storage tank 3. The liquid in the second dilute solution storage tank 4 is then pumped through the cooler 6, liquid inlet 2-3, and liquid distributor 2-4 into the collection tower 2 for countercurrent leaching using the circulation pump 5. The solution in the first dilute solution storage tank 3 is then transferred to the concentrated solution storage tank 8 using the concentrated solution pump 7.

[0119] The solution in the concentrated solution storage tank was analyzed by gas chromatography-mass spectrometry (GC-MS), and the chromatogram was obtained as follows. Figure 2 As shown. By Figure 2It is known that the solution in the concentrated solution storage tank contains 52 tobacco aroma compounds, specifically 3,3-dimethylhexane (4.93%), 4-methylundecyl-2-ene (2.89%), n-dodecane (4.59%), (Z)-2,3-dimethyl-3-heptene (3.88%), dibutanone (6.63%), 3-ethyl-6-heptafluorobutyryloxyoctane (4.99%), tetradecane (4.91%), 2,4-di-tert-butylphenol (10.86%), nonadecanyl pentafluoropropionate (2.26%), 5-methyl-undecane (3.58%), n-hexadecane (2.5%), and 6-ethyloctyl-3-ylpropyl oxalate (2.5%). Octyl trifluoroacetate (6.31%), 4-methyl-3-heptene (1.09%), 4,6-dimethylundecane (1.53%), 4-methyl-decane (1.41%), heptadecene (1.22%), phytane (1.13%), n-hexadecane (1.86%), 7-methylhexadecane (1.73%), 1,2,4-trimethylcyclohexane (1.44%), cyclopentyl ethyl ketone (1.43%), 1,2-diethyl-3-methylcyclohexane (1.98%), 1,2,4-trimethylcyclohexane (1.48%), neophytadiene (3.47%), nicotine (1.36%), ethylene glycol monobutyl ether (0.51%). 1,1,3,3,5,5-Hexamethyltrisiloxane (0.48%), p-toluenenitrile (0.34%), 4,5-dihydro-5,5-dimethyl-4-isopropylidene 1H-pyrazole (0.38%), 2,6,10-trimethyltridecane (0.85%), 3,6-dimethyl-undecane (0.49%), n-eicosane (2.92%), 2-methyldecane (0.82%), dodecyl dodecyl carbonate (0.42%), hexose pentafluoropropionate (0.94%), 1-iodoeicosane (0.46%), 1-iodooctadecane (0.85%), 3-ethyl-5-(2-ethylbutyl)octadecane (0.46%), 1-methyl -3-Propylcyclooctane (0.47%), 1-Ethyl-2-propylcyclohexane (0.61%), n-Octadecane (0.87%), 2-Hexyl-1-dodecanool (0.7%), tri-tert-butyldimethylsilyloxyalkylene (0.86%), trinonyl pentafluoropropionate (0.62%), dibutanone (0.61%), trimethylsilyl arsenite (0.5%), tetraethyl pentafluoropropionate (0.38%), dodecyl nonyl ether (0.57%), 2-methylpentyl ester, 4-pentenoic acid (0.47%), eicosyl isopropyl ether (0.47%), N-allyl-N'-ethyl-(Z)-alkylene-N-methylhydrazine (0.82%).

[0120] Example 2

[0121] The exhaust gas from re-dried tobacco leaves is 2m 3The volumetric flow rate of the flue gas is 1 / s. The gas and solid substances are separated by the gas-solid separator (cyclone separator) to remove solid substances from the exhaust gas and obtain preliminarily purified flue gas.

[0122] The pre-purified flue gas enters the collection tower 2 through gas inlet 2-1 and gas distributor 2-2 (open at the bottom of the pipe); the circulating pump 5 is turned on to cool the collecting agent (50% ethanol) in the first dilute solution storage tank 3 to 16°C in the cooler 6, and then sequentially through liquid inlet 2-3 and liquid distributor 2-4 (loop type) at a rate of 0.08m. 3 The gas is transferred to the inside of the collection tower 2; the pre-purified flue gas and the collecting agent are countercurrently leached in the packing layer 2-5, wherein the packing material in the packing layer 2-5 is silica gel particles; the gas-liquid volume flow ratio of the pre-purified flue gas and the collecting agent is 25:1; the purified flue gas obtained after countercurrent leaching passes through the liquid collection screen 2-6 to throttle the collecting agent in the purified flue gas and is then discharged through the exhaust port 2-8; the collecting agent solution containing tobacco aroma substances obtained by countercurrent leaching enters the first dilute solution storage tank 3 from the bottom of the collection tower 2 (by controlling the flow rate of the collecting agent solution containing tobacco aroma substances obtained by countercurrent leaching, liquid is maintained at the bottom of the tower). (A liquid seal can be formed in the body layer); the concentration of the solution in the first dilute solution storage tank 3 is sampled and tested from the first sampling port 3-7. When the concentration reaches 8%, the three-way ST-1 connecting the collection tower 2 to the first dilute solution storage tank 3 and the second dilute solution storage tank 4 is switched so that the liquid in the bottom of the collection tower 2 enters the second dilute solution storage tank 4, while the liquid entering the first dilute solution storage tank 3 is stopped. The liquid in the second dilute solution storage tank 4 is then passed through the cooler 6, liquid inlet 2-3, and liquid distributor 2-4 into the collection tower 2 for countercurrent leaching using the circulation pump 5; the solution in the first dilute solution storage tank 3 is transferred to the concentrated solution storage tank 8 using the concentrated solution pump 7.

[0123] The concentrated solution in the concentrated solution storage tank 8 is fed into the concentration unit 10 (vacuum distillation tower, vacuum degree 7 kPa, temperature 32℃) by the feed pump 9 for recovery. The gas trap flows into the trap storage tank 12 through the condenser 14. The tobacco aroma concentrate at the bottom of the concentration unit 10 flows into the concentrate storage tank 11 through the second outlet 10-3 to obtain the concentrated tobacco aroma substance. The recovered trap is transferred to the first dilute solution storage tank 3 through the second inlet 3-6 by the trap pump 13. The above steps are repeated to collect the tobacco aroma substance in the waste gas.

[0124] The solution in the concentrated solution storage tank was analyzed by gas chromatography-mass spectrometry (GC-MS), and the chromatogram was obtained as follows. Figure 3 As shown; the concentrated solution of the tobacco aroma substance was analyzed by gas chromatography-mass spectrometry (GC-MS), and the chromatogram was obtained as shown. Figure 4 As shown.

[0125] Depend on Figure 3It is known that the solution in the concentrated solution storage tank contains 47 tobacco aroma compounds, specifically 4-methylundecane-2-ene (3.17%), n-dodecane (4.55%), dibutanone (4.1%), 4-isopropyl-1,3-cyclohexanedione (7%), 4-isopropyl-1,3-cyclohexanedione (5.22%), 2,4-di-tert-butylphenol (13.1%), nonadecanoyl pentafluoropropionate (2.3%), 6-ethyloctyl-3-ylethyl oxalate (3.72%), n-hexadecane (3.5%), 6-ethyloctyl-3-ylbutyl oxalate (2.7%), and octaalkyltrifluoro... Acetate (8.94%), 3,3-dimethylhexane (1.7%), 4-methylundecane-2-ene (1.08%), 4,6-dimethylundecane (2.39%), 4,6-dimethyldodecane (1.46%), cyclononanone (1.3%), tetradecane (5%), 3,9-dimethylundecane (1.13%), 2,6,10-trimethyltetradecane (1.87%), 3,3-dimethylhexane (1.74%), heptadecanyl heptafluoroheptanoate (1.4%), 1-ethyl-2-propylcyclohexane (1.03%), 2-methylbutylcyclopentane (1.03%). 43%), butyl decyl ether (1.48%), n-octadecane (1.48%), nicotine (1.88%), ethylene glycol monobutyl ether (0.5%), 5-ethyl-2-methylheptane (0.55%), n-hexadecane (0.48%), 2,6,10-trimethyltridecane (0.42%), 7-methylhexadecane (0.81%), 5-methyldodecane (0.43%), n-eicosane and its isomers (2.51%), n-tetracosane (0.74%), 1-iodoeicosane (0.41%), 2-methyleicosane (0.45%), octadecyl octafluorobutyrate ester (0.49%), docosyl vinyl carbonate (0.6%), 3-ethyl-5-(2-ethylbutyl)octadecane (0.4%), 2,4-dimethyleicosane (0.92%), 1-ethyl-2-propylcyclohexane (0.49%), triallylsilane (0.59%), octadecyl octafluorobutyrate (0.48%), octadecyl 2-propyl sulfite (0.92%), ethylcyclooctane (0.45%), 1-ethyl-1,3-dimethyl-transcyclohexane (0.55%), 8-dihydrobiguanidine (0.46%), butylcyclooctane (0.75%).

[0126] Depend on Figure 4It is known that the concentrated tobacco aroma compounds contain 37 tobacco aroma compounds, specifically tetradecane (1.75%), nicotine (8.21%), phytosterol acetate (47.76%), 2,4-di-tert-butylphenol (21.88%), n-dodecane (3.08%), tetrahydropyrrole (0.30%), 2,6,10-trimethyltridecane (1.12%), 4-hydroxy-6-methylpyrimidine (0.11%), methylenebis(2-methylaziridine) (4.63%), 2-hexyldodecane-1-ol (1.40%), benzylhydrazine (0.36%), 1-nonadecanene (1.19%), 2 - Hexyldecyl alcohol (1.58%), 3,3-dimethyloctane (0.51%), n-docosane (0.56%), nitrosoacetidine (3.05%), dimethyldimethoxysilane (2.12%), 2-cyano-3-methyl-2-prop-2-ylbutyric acid (0.20%), 6-ethyl-3-octylbutyl phthalate (0.97%), and lower amounts of 4,6-dimethyldodecane, hexadecylcyclooctasiloxane, dodecylcyclohexasiloxane, 7-methylhexadecane, 1α-butyl-2β-propylcyclopentane, 2-hexylacetate, 2-tridecyl alcohol, octadecyl trifluoroacetate, and n-hexadecane.

[0127] Example 3

[0128] The exhaust gas from re-dried tobacco leaves is 1.8m 3 The volumetric flow rate of the flue gas is 1 / s. The gas and solid substances are separated by the gas-solid separator (cyclone separator) to remove solid substances from the exhaust gas and obtain preliminarily purified flue gas.

[0129] The pre-purified flue gas enters the collection tower 2 through gas inlet 2-1 and gas distributor 2-2 (open at the bottom of the pipe); the circulating pump 5 is turned on to cool the collecting agent (acetone) in the first dilute solution storage tank 3 to 15°C in the cooler 6, and then sequentially through liquid inlet 2-3 and liquid distributor 2-4 (ring pipe type) at a rate of 0.09m. 3The gas is transferred to the inside of the collection tower 2 at a rate of / s; the pre-purified flue gas and the collector are leached countercurrently in the packing layer 2-5, wherein the packing in the packing layer 2-5 is ceramic Raschig ring particles; the gas-liquid volume flow ratio of the pre-purified flue gas and the collector is 20:1; the purified flue gas obtained after countercurrent leaching passes through the liquid collection screen 2-6 to throttle the collector in the purified flue gas and is then discharged through the exhaust port 2-8; the collector solution containing tobacco aroma substances obtained from countercurrent leaching enters the first dilute solution storage tank 3 from the bottom of the collection tower 2 (by controlling the flow rate of the collector solution containing tobacco aroma substances obtained from countercurrent leaching, the tower is kept at a constant flow rate). (A liquid layer at the bottom can form a liquid seal); Samples are taken from the first sampling port 3-7 to test the concentration of the solution in the first dilute solution storage tank 3. When the concentration reaches 12%, the tee connecting the collection tower 2 to the first dilute solution storage tank 3 and the second dilute solution storage tank 4 is switched so that the liquid in the bottom of the collection tower 2 enters the second dilute solution storage tank 4, while the liquid entering the first dilute solution storage tank 3 is stopped. The liquid in the second dilute solution storage tank 4 is then pumped through the cooler 6, liquid inlet 2-3, and liquid distributor 2-4 into the collection tower 2 for countercurrent leaching using the circulation pump 5; The solution in the first dilute solution storage tank 3 is transferred to the concentrated solution storage tank 8 using the concentrated solution pump 7;

[0130] The solution in the concentrated solution storage tank was analyzed by gas chromatography-mass spectrometry (GC-MS), and the chromatogram was obtained as follows. Figure 5 As shown. By Figure 5It is known that the solution in the concentrated solution storage tank contains 75 tobacco aroma compounds, specifically: 4-methylundecyl-2-ene (2.6%), cyclopentamethoxysiloxane (2.84%), n-dodecane (3.09%), 2-ethyl-1,3-dimethylcyclohexane (3.46%), 1,2,4-trimethylcyclohexane (5.92%), 3,3,5-trimethyl-1-hexene (4.18%), dodecylcyclohexasiloxane (3.06%), tetradecane (3.3%), n-eicosane and its isomers (3.97%), 2,4-di-tert-butylphenol (9.04%), 6-ethyloctyl-3-ylethyl oxalate (2.92%), (E)-2-(8-fluorooctadecayl-7-en-7- (Z)-2,2,5,5-Tetramethyl (2.05%), 4,6-Dimethylundecane (1.42%), 4-Methylundecyl-2-ene (1.03%), 4,6-Dimethylundecane (3.15%), cyclononanone (1.04%), phytane (1.56%), 3-Methylhexadecane (1.5%), tetradecyl-cycloheptane (1.96%), (Z)-2,2,5,5-Tetramethyl-3-hexene (1.2%), 1-Ethyl-2,4-Dimethylcyclohexane (1.95%), 1,2,4-Trimethylcyclohexane (1.22%), n-Hexadecane (1.88%), 3,4-Dihydroxyphenyleicosanoic acid (TMS) (1.27%), octaalkyltrifluoroacetate ( 1.53%), dodecyl pentafluoropropionate (1.69%), butyl decyl ether (2.52%), octadecyl trifluoroacetate (1.18%), octadecylcyclononasiloxane (1.25%), icosylcyclodecasiloxane (2.5%), tetradecyl hexasiloxane (1.43%), 1,1,3,3,5,5,7,7,9,9,11,11,13,13,15,15-hexadecyl octasiloxane (3.21%), ethylene glycol monobutyl ether (0.79%), nicotine (0.4%), 3,6-dimethyl-undecane (0.34%), nonylprop-1-en-2-carbonate (0.42%), m-methylbenzonitrile (0.31%), isophorone (0.31%), 1-(2- (Butoxyethoxy)-ethanol (0.45%), (Z)-4-methylbenzaldehyde oxime (0.3%), 5-methyltridecane (1.05%), tetradecyl-cyclooctane (0.95%), 2-methyldecane (0.42%), 3,9-dimethylundecane (0.97%), 7-methylhexadecane (0.71%), (E)-2-(8-fluorooctadecayl-7-en-7-yl)-4,4,5,5-tetramethyl (0.32%), 1,2,4-trimethylcyclohexane (1.34%), 1-iodoeicosane (0.68%), N-(4-fluorophenyl)-cyclopentanecarboxamide (0.39%), heptafluorobutyrate dodecylbutyrate (0.52%), 2,4-dimethyleicosane (0.52%), ethylcyclooctane (0.49%), methyltris(trimethylsiloxane)silane (0.4%), 1-[2-(5-cyclohexyl-4-ethyl-4H-[1,2,4]triazol-3-ylthioalkyl)ethyl]piperidine (0.44%), 1-ethyl-2-propylcyclohexane (0.8%), tetrahexadecyl trifluoroacetate (0.41%), 1,2-diethylcyclohexane (0.35%), N-(4-(trimethylsilyl)phenylacetamide (0.3%), 2-(4-methylphenyl)indazine (0.6%).

[0131] Example 4

[0132] The exhaust gas from re-dried tobacco leaves is 2.5m 3 The volumetric flow rate of the flue gas is 1 / s. The gas and solid substances are separated by the gas-solid separator (cyclone separator) to remove solid substances from the exhaust gas and obtain preliminarily purified flue gas.

[0133] The pre-purified flue gas enters the collection tower 2 through gas inlet 2-1 and gas distributor 2-2 (open at the bottom of the pipe); the circulating pump 5 is turned on to cool the collecting agent (methanol) in the first dilute solution storage tank 3 to 14°C in the cooler 6, and then sequentially through liquid inlet 2-3 and liquid distributor 2-4 (loop pipe type) at a rate of 0.1m... 3 The gas is transferred to the inside of the collection tower 2 at a rate of / s; the pre-purified flue gas and the collecting agent are leached countercurrently in the packing layer 2-5, wherein the packing material in the packing layer 2-5 is macroporous silica gel particles; the gas-liquid volume flow ratio of the pre-purified flue gas and the collecting agent is 25:1; the purified flue gas obtained after countercurrent leaching passes through the liquid collection screen 2-6 to throttle the collecting agent in the purified flue gas and is then discharged through the exhaust port 2-8; the collecting agent solution containing tobacco aroma substances obtained from countercurrent leaching enters the first dilute solution storage tank 3 from the bottom of the collection tower 2 (by controlling the flow rate of the collecting agent solution containing tobacco aroma substances obtained from countercurrent leaching, the bottom of the tower is kept constant). (A liquid layer is required to form a liquid seal); Samples are taken from the first sampling port 3-7 to test the concentration of the solution in the first dilute solution storage tank 3. When the concentration reaches 15%, the three-way valve connecting the collection tower 2 to the first dilute solution storage tank 3 and the second dilute solution storage tank 4 is switched, allowing the liquid in the bottom of the collection tower 2 to enter the second dilute solution storage tank 4, while stopping the liquid from entering the first dilute solution storage tank 3. The liquid in the second dilute solution storage tank 4 is then pumped through the cooler 6, liquid inlet 2-3, and liquid distributor 2-4 into the collection tower 2 for countercurrent leaching using the circulation pump 5; The solution in the first dilute solution storage tank 3 is then transferred to the concentrated solution storage tank 8 using the concentrated solution pump 7.

[0134] The concentrated solution in the concentrated solution storage tank 8 is transferred to the concentration unit 10 (vacuum distillation tower, vacuum degree of 8 kPa, temperature of 34℃) by the feed pump 9 for recovery. The gas trap flows into the trap storage tank 12 through the condenser 14. The tobacco aroma concentrate at the bottom of the concentration unit 10 flows into the concentrate storage tank 11 through the second outlet 10-3 to obtain the concentrated tobacco aroma substance. The recovered trap is transferred to the first dilute solution storage tank 3 through the second inlet 3-6 by the trap pump 13. The above steps are repeated to collect the tobacco aroma substance in the waste gas.

[0135] The solution in the concentrated solution storage tank was analyzed by gas chromatography-mass spectrometry (GC-MS), and the chromatogram was obtained as follows. Figure 6 As shown, the concentrated solution of the tobacco aroma substance was analyzed by gas chromatography-mass spectrometry (GC-MS), and the chromatogram was obtained as follows. Figure 7 As shown.

[0136] Depend on Figure 6It is known that the solution in the concentrated solution storage tank contains 50 tobacco aroma compounds, specifically: 4-methyl-tetane (3.03%), 4-methyl-undecyl-2-ene (2.9%), n-dodecane (4.28%), 1,1,2-trimethylcyclohexane (4.16%), 3-ethyl-6-heptafluorobutyryloxyoctane (7.14%), (2-methylbutyl)-cyclopentane (5.29%), tetradecane (4.74%), 2,4-di-tert-butylphenol (11.89%), cyclopentyl ethyl ketone (2.34%), 6-ethyl-octyl-3-ylethyl oxalate (3.65%), and n-hexadecane (2.43%). 2,3,4-Trimethylhexane (2.53%), octaalkyl trifluoroacetate (3.31%), neophytadiene (2.75%), 2,3,5,8-tetramethyldecane (1.18%), 4-methylundecyl-2-ene (1.05%), 4,6-dimethylundecane (2.35%), 4,6-dimethyldodecane (1.52%), tetradecyl 2-bromopropionate (1.36%), 2,6,10-trimethyltetradecane (1.18%), 7-methylhexadecane (1.89%), 3-ethylundecane (1.83%), hexadecylprop-1-en-2-ester carbonate (1.45%) Nonadecanyl pentafluoropropionate (1.13%), 1,2,4-trimethylcyclohexane (2.93%), octaalkyltrifluoroacetate (3.77%), triallylsilane (1.48%), nicotine (1.27%), ethylene glycol monobutyl ether (0.58%), phytane (1.04%), 2,6,10-trimethyltridecane (0.45%), n-hexadecane (0.86%), decyltridecyl carbonate (0.38%), 1-iodoeicosane (0.75%), 1-iodododecane (0.46%), n-eicosane (3.07%), N-(4-fluorophenyl)-cyclopentanecarboxamide (0.5%), N -(4-fluorophenyl)-cyclopentane carboxamide (0.47%), 1α-butyl-2β-propylcyclopentane (0.63%), n-octadecane (0.82%), 1-cyclohexyl-1-<4-methyl-cyclohexyl>-ethane (0.56%), ethylcyclooctane (0.5%), 2-pentadecanol (0.5%), tri-tert-butyldimethylsilyloxyalkylene (0.36%), ethylcyclooctane (0.41%), ethylcyclooctane (0.74%), ethylcyclooctane (0.44%), 1-ethyl-2-propylcyclohexane (0.44%), trans-1-ethyl-1,3-dimethyl-cyclohexane (0.74%).

[0137] Depend on Figure 7It is known that the concentrated tobacco aroma compounds contain 45 tobacco aroma compounds, specifically: nicotine (16.99%), tetradecane (2.33%), phytosterol acetate (46.85%), n-hexadecane (1.08%), 2,4-di-tert-butylphenol (12.58%), phenethyl alcohol (3.92%), dodecylcyclohexasiloxane (0.14%), 1,5,9-trimethyl-12-(1-methylethyl)-4,8,13 -Cyclododecanetrien-1,3-diol (0.98%), p-cresol (0.29%), n-unethosane (1.16%), 2,6,10-trimethyltridecane (0.34%), 2-hexyldodecane-1-ol (0.97%), 2-hexyldecyl alcohol (2.15%), dioctyl phthalate (0.21%), 3-(4,8,12-trimethyltridecyl)furan (2.10%), 6-ethyl-3-phthalate Octyl butyl ester (0.73%), 3,4-(methylenedioxy)toluene (0.45%), 4,6-dimethyldodecane (0.88%), octadecyl octyl ether (0.58%), α-cyperone (0.30%), 1-nonadecane (1.64%), 2-hexyldecyl alcohol (0.58%), 4,6-dimethylundecane (0.17%), methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (0.10%), 2 - Hexyldodecane-1-ol (0.88%), 2-heptenoic acid, 4-nitrobenzene ester (0.28%), di(2-pentyl) phthalate (0.30%), 2-ethylhexyl methacrylate (0.36%), isobutyric anhydride (0.48%), and lower amounts of n-dodecane, 2-hexyldodecane-1-ol, 2-methyltridecane, hexadecylcyclooctasiloxane, 4-methyloctane, p-cresol, 2-methyl-1-decyl alcohol, and isobutyric anhydride.

[0138] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0139] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves, characterized in that, The methods include: The exhaust gas from the re-dried tobacco leaves is flowed through a cyclone separator according to a first preset volume for gas-solid separation to obtain preliminarily purified flue gas. The pre-purified flue gas is sent into the collection tower through a gas inlet and a gas distributor. The collector stored in the dilute solution storage tank is sent to the cooler and cooled to the first set temperature. Then, it is transferred to the collection tower according to the second preset volume through the liquid inlet and the liquid distributor. The preliminarily purified flue gas and the collector are leached countercurrently in the collection tower to obtain purified flue gas and a collector solution containing tobacco aroma substances. The purified flue gas is throttled and purified by a liquid trapping screen to remove the trapping agent from the flue gas, and then the flue gas is discharged. The trapping agent solution containing tobacco aroma substances is returned to the dilute solution storage tank; The solution in the dilute solution storage tank is transferred to the concentrated solution storage tank using a concentrated solution pump to obtain a tobacco aroma substance solution; The dilute solution storage tank includes a first dilute solution storage tank and a second dilute solution storage tank; The method also includes: The concentration of the solution in the first dilute solution storage tank was sampled and tested; When the concentration reaches the set concentration value, the tee connecting the collection tower to the first dilute solution storage tank and the second dilute solution storage tank is switched, so that the liquid in the collection tower enters the second dilute solution storage tank, while the liquid entering the first dilute solution storage tank is stopped.

2. The method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves according to claim 1, characterized in that, The method also includes: The tobacco aroma substance solution is sent to a concentration device for trapping agent separation and cooling to obtain a gas trapping agent and a concentrated tobacco aroma liquid; The gas collector in the concentration unit flows into the collector storage tank through the condenser, and then the collector in the collector storage tank is transferred to the dilute solution storage tank by the collector pump. The tobacco aroma concentrate in the concentration device flows into the concentrate storage tank, resulting in a concentrated solution of tobacco aroma substances.

3. The method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves according to claim 1, characterized in that, The first preset volume is 1m 3 / s~6m 3 / s; The first set temperature is 0℃~20℃; Inside the collection tower, the volumetric flow rate ratio of the pre-purified flue gas to the collection agent is 10:1 to 200:

1.

4. The method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves according to claim 2, characterized in that, The tobacco aroma substance solution is sent to a concentration device for collector separation, specifically including: The tobacco aroma substance solution is separated by a trapping agent using vacuum distillation or vacuum rotary evaporation; The pressure of the vacuum distillation is 1 kPa to 10 kPa, and the temperature is 30°C to 50°C. The vacuum degree of the vacuum rotary evaporation is 1 kPa to 10 kPa, the rotation speed is 30 r / min to 110 r / min, and the temperature is 30℃ to 50℃.

5. The method for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves according to claim 2, characterized in that, The tobacco aroma substance solution is sent to a concentration device for collector cooling, specifically including: The tobacco fragrance substance solution is cooled using a water cooling method; The temperature of the water used for water cooling is 5–25℃.

6. A collection device for collecting tobacco aroma from the exhaust gas of re-dried tobacco leaves according to any one of claims 1-5, characterized in that, The device includes a cyclone separator, a collection tower, a dilute solution storage tank, a circulating pump, a cooler, and a concentrated solution tank; The collection tower is equipped with a gas inlet, a gas distributor, a liquid inlet, and a liquid distributor; and the liquid inlet and the liquid distributor are located above the gas inlet and the gas distributor. The collection tower, the dilute solution storage tank, the circulating pump, and the cooler are connected in sequence from end to end; The cyclone separator is connected to the collection tower; The concentrated solution tank is connected to the dilute solution storage tank; The dilute solution storage tank includes a first dilute solution storage tank and a second dilute solution storage tank.

7. The tobacco aroma collection device in the exhaust gas of re-dried tobacco leaves according to claim 6, characterized in that, The apparatus also includes a concentration unit, a concentrate storage tank, a condenser, a collector storage tank, and a vacuum unit; The first outlet of the concentration device is sequentially connected to the condenser and the vacuum device; The second outlet of the concentration device is connected to the concentrated liquid storage tank; The reflux inlet of the concentration device is connected to the trapping agent storage tank.

8. The tobacco aroma collection device in the exhaust gas of re-dried tobacco leaves according to claim 6, characterized in that, The collection tower is equipped with a packing layer inside the tower body; The packing layer is located in the middle of the vertical direction of the trapping tower; The number of layers in the filler layer is 1 to 3; The filler in the packing layer includes a structured packing layer and / or a random packing layer. The structured packing layer includes PP structured corrugated packing or metal wire mesh corrugated packing, and the random packing layer includes ceramic, resin, macroporous silica gel, activated carbon or metal particle packing.

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