CN109602065B - Essence recovered from waste gas discharged in reconstituted tobacco concentration process and recovery method and application thereof - Google Patents
Essence recovered from waste gas discharged in reconstituted tobacco concentration process and recovery method and application thereof Download PDFInfo
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/14—Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
- A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
- A24B15/30—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances
- A24B15/301—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances by aromatic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
- B01D2252/2023—Glycols, diols or their derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/50—Combinations of absorbents
- B01D2252/504—Mixtures of two or more absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for recovering essence from waste gas discharged in a concentration process of reconstituted tobacco production and application of the recovered essence. The invention can effectively extract the low-boiling-point aroma components discharged in the air in the concentration process, and when the invention is applied, the aroma components are sealed and protected, thereby avoiding the secondary loss in the subsequent processing process.
Description
Technical Field
The invention belongs to the technical field of reconstituted tobacco processing, and particularly relates to a method for recovering essence from waste gas discharged in a concentration process of reconstituted tobacco production and application of the recovered essence.
Technical Field
The reconstituted tobacco is homogenized tobacco which is prepared by using tobacco fragments, tobacco powder, tobacco stems and the like as raw materials, using water as a main extraction solvent, carrying out solid-liquid separation on water-soluble substances and insoluble substances of the tobacco raw materials, pulping the insoluble substances, then carrying out paper making by a paper machine to form a sheet base, purifying, concentrating and blending the water-soluble substances to form a coating liquid, reducing the coating liquid into the sheet base, drying, slicing and the like.
The tobacco aroma concentration of the reconstituted tobacco is low, which is related to the loss of part of low-boiling-point aroma quality and aroma quantity in the processing process, and a certain amount of tobacco endogenous spice is required to be added to increase the aroma and aroma of the reconstituted tobacco, improve the tobacco flavor and reduce the woody smell and the spicy feeling. The aroma loss in the processing process mainly occurs in a concentration process, the process usually adopts a low-temperature vacuum concentration technology, most of tobacco aroma substances are remained in concentrated solution, a small part of mixed vapor of aroma and water vapor is extracted under the vacuum suction effect and enters a condensation tower, some aroma with higher condensation point is condensed with the water vapor to form sewage condensed water, and then the sewage condensed water is produced and recycled, while aroma and air with lower condensation point are extracted under the vacuum suction effect and discharged to the atmosphere, so that the aroma components discharged to the atmosphere are mainly some low-boiling components in the tobacco, including lower aliphatic hydrocarbon, alcohol, aldehyde, ketone and the like, and the low-boiling components have an important effect on keeping the smoking style of the cigarette, and the volatile aroma substances are extracted to form essence and applied to reconstituted tobacco leaves to supplement the characteristic aroma of the tobacco and transmit the original aroma, has better application prospect.
Chinese patent publication No. CN105707968B describes a method for recycling tobacco aroma substances generated during the production of paper-making reconstituted tobacco, which is to recycle tobacco aroma substances in hot dry air in the extraction section, the coating section and the drying section of the reconstituted tobacco, and then treat the recycled aroma substances for the production of the reconstituted tobacco. The main defect of the technology is that the recovered aroma substances are high-boiling-point tobacco aroma components volatilized in an extraction section, a coating section and a drying section, and are not suitable for low-boiling-point aroma components discharged into air in a concentration section; the aroma recovery system comprises multi-effect concentration equipment, and the low-boiling-point aroma components are lost most in the process; and thirdly, the recovered aroma substances are blended and then sent to a coating liquid blending section or a flavoring section for producing reconstituted tobacco for utilization, and the reconstituted tobacco is subjected to procedures of moisture regain, temperature increase and humidification, air contact, high temperature and the like when being used for cigarette processing, so that the aroma substances flavored in the reconstituted tobacco are lost again. Chinese patent publication No. CN207856361U describes a system for recovering fragrance during evaporation, which recovers essence by arranging a plate condenser behind an evaporator vacuum pump. The main defect of the technology is that the plate condenser can only recover the aroma of which the condensation point is about 10 ℃ and which is pumped out by a vacuum pump, and the recovery efficiency is low.
Disclosure of Invention
The invention provides a method for recovering essence from waste gas discharged in a concentration process of reconstituted tobacco production and application of the recovered essence, aiming at the problems that low-boiling-point aroma components are more lost and difficult to effectively recycle in the prior art, the low-boiling-point aroma components discharged in the air in the concentration process can be effectively extracted, and the aroma components are sealed and protected during application, so that the secondary loss in the subsequent processing process is avoided.
The invention is realized by the following technical scheme:
the method for recovering essence from waste gas discharged in the reconstituted tobacco concentration process comprises a normal-temperature absorption recovery treatment process and a low-temperature absorption recovery treatment process which are sequentially carried out, wherein the normal-temperature absorption recovery treatment process realizes the crude extraction of aroma components in the waste gas, the low-temperature absorption recovery treatment process realizes the deep extraction of the aroma components in the waste gas, and the normal-temperature absorption recovery treatment process comprises the following steps: recording waste gas discharged by a reconstituted tobacco concentration process as primary waste gas, absorbing the primary waste gas by an absorption liquid and then discharging secondary waste gas, keeping the temperature of the absorption liquid at 15-35 ℃, and performing supercritical carbon dioxide extraction on the absorption liquid obtained after absorption (preferably, performing supercritical carbon dioxide extraction on the absorption liquid saturated in adsorption, (replacing new absorption liquid after the absorption liquid is saturated in absorption, and the saturation is calculated by the absorption liquid absorption amount according to the weight fraction of 0.5 percent)), wherein the supercritical carbon dioxide extraction conditions are as follows: extracting at the pressure of 10-30 MPa and the temperature of 35-65 ℃ for 1-3 hours, wherein the entrainer is propylene glycol or absolute ethyl alcohol, the flow rate is 0.05-0.15 mL/min, and the residual liquid after extraction is transferred to a low-temperature essence storage tank;
the absorption liquid is a mixed solution of ethanol and propylene glycol in any proportion;
the low-temperature adsorption recovery treatment process comprises the following steps: cooling the secondary waste gas to 10 ℃, adsorbing and enriching aroma components by using an adsorbent, desorbing the adsorbent obtained after adsorption (after the adsorbent is adsorbed and saturated, a new adsorbent is replaced, the saturation is calculated by the adsorption amount according to 1% by weight), condensing the high-concentration aroma obtained by desorption, transferring the condensed high-concentration aroma to the low-temperature essence storage tank, and discharging uncondensed air from an outlet of a condenser, wherein the working temperature of the low-temperature essence storage tank is-20-0 ℃;
the liquid in the low-temperature essence storage tank is the original liquid of the tobacco essence.
Preferably, the adsorbent is a honeycomb activated carbon or molecular sieve adsorbent.
Preferably, the desorption uses an inert gas as the desorption medium.
Preferably, the inert gas is nitrogen.
Preferably, the temperature of the inert gas as the desorption medium is 80-100 ℃. The high-temperature inert gas can desorb the adsorbed perfume components to form high-concentration fragrance, and can be used as the inert gas to protect the fragrance and avoid chemical reaction of the fragrance.
Preferably, the temperature of the condensation is-50 ℃ to 0 ℃.
The essence stock solution is obtained by the method for recovering the essence from the waste gas discharged in the reconstituted tobacco concentration process.
The application of the essence stock solution recovered from the waste gas discharged in the reconstituted tobacco concentration process in flavor enhancement of the reconstituted tobacco is characterized in that the essence stock solution is used as a core material solution for preparing essence microcapsules, a mixed solution of soybean protein isolate and cyclodextrin is used as a wall material solution for preparing the essence microcapsules, then the core material solution and the wall material solution are stirred according to the mass ratio of 1: 1-3 and then dispersed at a high speed to obtain emulsion, then the emulsion is sprayed and dried to obtain the essence microcapsules, and then the obtained essence microcapsules are added into a coating liquid for use; or directly adding the essence stock solution into the coating liquid for use.
Preferably, the adding amount of the essence microcapsule or essence stock solution in the coating liquid is 0.1-1% (mass percentage) based on the mass of the essence stock solution
The method firstly realizes the crude extraction of the aroma components in the waste gas in the normal temperature absorption recovery treatment process, then realizes the deep extraction of the aroma components in the waste gas in the low temperature absorption recovery treatment process, and ensures that the low boiling point aroma components discharged in the air in the concentration process can be effectively extracted by the method through the components and temperature setting of the absorption liquid, the pressure and temperature setting of the supercritical carbon dioxide, the adsorption and desorption step design of the adsorbent. Furthermore, the essence stock solution obtained by recycling is prepared into the microcapsule, so that the sealing protection is performed, the loss of aroma components in the subsequent processing process is avoided, the essence microcapsule can play a good modifying role on the overall sensory characteristics of the reconstituted tobacco when used for the production of the reconstituted tobacco, has a lasting and slow-release effect, is beneficial to improving the compatibility of the reconstituted tobacco and has a good application prospect. The essence microcapsule is coordinated with the original fragrance of tobacco, has a lasting slow-release effect when added into reconstituted tobacco, can increase the sweet feeling of the smoke, has an obvious effect on reducing the irritation and the dry feeling of the throat, and can obviously improve the smoking quality of the reconstituted tobacco.
Detailed Description
In order to make the technical purpose, technical solutions and advantageous effects of the present invention more clear, the technical solutions of the present invention are further described below with reference to specific embodiments.
Example 1
The method for recovering essence from waste gas discharged in the reconstituted tobacco concentration process comprises a normal-temperature absorption recovery treatment process and a low-temperature adsorption recovery treatment process which are sequentially carried out, and comprises the following specific steps:
(1) waste gas discharged in the concentration process enters absorption liquid, the absorption liquid is a mixed solution of ethanol and propylene glycol with the volume ratio of 1:1, the volume of the absorption liquid is 5L, the temperature of the absorption liquid is 30 ℃, and after absorption is carried out for 6 hours, the obtained absorption liquid is saturated and is subjected to supercritical carbon dioxide extraction;
(2) supercritical carbon dioxide extraction conditions: extracting at 60 deg.C under 25 MPa for 1 hr with propylene glycol as entrainer and 0.1mL/min flow rate, transferring the residual liquid to low-temperature essence storage tank at 0 deg.C;
(3) and (2) cooling the waste gas discharged after absorption by the absorption liquid in the step (1) to 10 ℃, adsorbing the cooled waste gas by an adsorbent filled with a zeolite molecular sieve for 5h to reach saturation, desorbing by using high-temperature nitrogen to form high-concentration aroma, condensing the high-concentration aroma at the temperature of-40 ℃, transferring the condensed essence liquid into a low-temperature essence storage tank, and uniformly mixing the condensed essence liquid with the extracted residue in the step (2) to obtain the essence stock solution.
Example 2
The method for recovering essence from waste gas discharged in the reconstituted tobacco concentration process comprises a normal-temperature absorption recovery treatment process and a low-temperature adsorption recovery treatment process which are sequentially carried out, and comprises the following specific steps:
(1) waste gas discharged in the concentration process enters absorption liquid, the absorption liquid is a mixed solution of ethanol and propylene glycol with the volume ratio of 1:2, the volume of the absorption liquid is 8L, the temperature of the absorption liquid is 35 ℃, and after absorption for 4 hours, the obtained absorption liquid is saturated and is subjected to supercritical carbon dioxide extraction;
(2) supercritical carbon dioxide extraction conditions: extracting at 65 deg.C under 10MPa for 3 hr with propylene glycol as entrainer and 0.15mL/min, transferring the residual liquid into low-temperature essence storage tank at 5 deg.C;
(3) and (2) cooling the waste gas discharged after absorption by the absorption liquid in the step (1) to 8 ℃, adsorbing the cooled waste gas by an adsorbent filled with an active carbon adsorbent for 7 hours until the waste gas is saturated, desorbing by using high-temperature nitrogen to form high-concentration aroma, condensing the high-concentration aroma at the temperature of-30 ℃, transferring the condensed essence liquid into a low-temperature essence storage tank, and uniformly mixing the condensed essence liquid with the extracted residue in the step (2) to obtain the essence stock solution.
Example 3
The method for recovering essence from waste gas discharged in the reconstituted tobacco concentration process comprises a normal-temperature absorption recovery treatment process and a low-temperature adsorption recovery treatment process which are sequentially carried out, and comprises the following specific steps:
(4) waste gas discharged in the concentration process enters absorption liquid, the absorption liquid is a mixed solution of ethanol and propylene glycol with a volume ratio of 3:1, the volume of the absorption liquid is 10L, the temperature of the absorption liquid is 15 ℃, and after absorption is carried out for 8 hours, the obtained absorption liquid is saturated and is subjected to supercritical carbon dioxide extraction;
(5) supercritical carbon dioxide extraction conditions: extracting at 35 deg.C under 10MPa for 3 hr with anhydrous ethanol as entrainer and 0.05mL/min flow rate, transferring the residual liquid into low-temperature essence storage tank at 10 deg.C;
(6) and (2) cooling the waste gas discharged after absorption by the absorption liquid in the step (1) to 5 ℃, adsorbing the cooled waste gas by an adsorbent filled with a zeolite molecular sieve for 8 hours until the waste gas is saturated, desorbing by using high-temperature nitrogen to form high-concentration aroma, condensing the high-concentration aroma at the temperature of-50 ℃, transferring the condensed essence liquid into a low-temperature essence storage tank, and uniformly mixing the condensed essence liquid with the extracted residue in the step (2) to obtain the essence stock solution.
The detection results of the aroma components in the essence stock solution recovered in the above example 1 are shown in the following table 1:
TABLE 1 GC/MS detection of the essence stock solution obtained in example 1
As can be seen from table 1, the invention firstly realizes the crude extraction of the aroma components in the exhaust gas through the normal temperature absorption recovery treatment process, and then realizes the deep extraction of the aroma components in the exhaust gas through the low temperature absorption recovery treatment process, and the components and temperature setting of the absorption liquid, the pressure and temperature setting of the supercritical carbon dioxide, and the design of the adsorption and desorption steps of the adsorbent, which all ensure that the invention can effectively extract the low boiling point aroma components discharged in the air in the concentration process.
Application example 1
Taking 5g of the essence stock solution obtained in the step (3) in the example 1 as a core material for preparing the microcapsule, taking a mixed solution obtained by dissolving 12.5g of soy protein isolate and 12.5g of cyclodextrin in 250mL of distilled water as a wall material solution for preparing the essence microcapsule, stirring the core material solution and the wall material solution according to the mass ratio of 1: 3 at a temperature of below 10 ℃, dispersing at a high speed to obtain an emulsion, performing spray drying to obtain the essence microcapsule, and adding the obtained essence microcapsule into a coating liquid for use.
Adding the essence microcapsules into the coating liquid, wherein the adding amount is 0.5 percent based on the mass of the essence stock solution, coating the reconstituted tobacco at a coating rate of 39 percent, drying, shredding and processing cigarettes, and then performing sensory evaluation on the reconstituted tobacco, which is shown in comparative example 1.
Comparative example 1
Taking application example 1 as an experimental group 1, taking essence stock solution directly added into the coating solution in an amount of 0.5% as an experimental group 2, taking the coating solution in the prior art as a control group 1, and performing sensory quality evaluation, wherein the evaluation results are shown in table 2:
TABLE 2 comparative evaluation results of sensory quality
Through sensory evaluation of tobacco industry smokers, the essence recovered by the method is consistently considered to be capable of effectively reducing the irritation of reconstituted tobacco, and after the essence is prepared into microcapsules, the original fragrance of the tobacco is obviously increased, the fragrance is pure and mild, the miscellaneous gas is reduced, and the smoke is soft and fine.
Finally, it should be noted that: the above embodiments are merely illustrative and not restrictive of the technical solutions of the present invention, and any equivalent substitutions and modifications or partial substitutions made without departing from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.
Claims (3)
1. The application of essence stock solution recovered from waste gas discharged in a reconstituted tobacco concentration process in flavoring of reconstituted tobacco is characterized in that: when the essence microcapsule coating liquid is used, an essence stock solution is used as a core material solution for preparing the essence microcapsule, a mixed solution of soy protein isolate and cyclodextrin is used as a wall material solution for preparing the essence microcapsule, then the core material solution and the wall material solution are stirred according to the mass ratio of 1: 1-3 and then are uniformly dispersed to obtain an emulsion, then the emulsion is subjected to spray drying to obtain the essence microcapsule, and then the obtained essence microcapsule is added into the coating liquid for use;
the adding amount of the essence stock solution in the coating liquid is 0.1-1% by mass of the essence stock solution;
the essence stock solution contains odor substances with various fruit tastes, substances with caramel odor and substances with strong rose fragrance, has the characteristics of mellow fragrance, less miscellaneous gas and soft and exquisite smoke, and can reduce the irritation of reconstituted tobacco;
the essence stock solution is obtained by recovering waste gas discharged in the reconstituted tobacco concentration process, and comprises a normal-temperature absorption recovery treatment process and a low-temperature adsorption recovery treatment process which are sequentially carried out;
the normal-temperature absorption recovery treatment process comprises the following steps: recording waste gas discharged in the reconstituted tobacco concentration process as primary waste gas, absorbing the primary waste gas by an absorption liquid at 15-35 ℃ and then discharging secondary waste gas, wherein the absorption liquid is a mixed solution of ethanol and propylene glycol in any proportion; and (3) carrying out supercritical carbon dioxide extraction on the absorption liquid obtained after absorption, wherein the supercritical carbon dioxide extraction conditions are as follows: extracting at the pressure of 10-30 MPa and the temperature of 35-65 ℃ for 1-3 hours, wherein the entrainer is propylene glycol or absolute ethyl alcohol, the flow rate is 0.05-0.15 mL/min, and the residual liquid after extraction is transferred to a low-temperature essence storage tank;
the low-temperature adsorption recovery treatment process comprises the following steps: cooling the secondary waste gas to 0-10 ℃, adsorbing and enriching aroma components by using an adsorbent, desorbing the adsorbent obtained after adsorption, condensing the high-concentration aroma obtained by desorption, and transferring the condensed high-concentration aroma to the low-temperature essence storage tank, wherein the working temperature of the low-temperature essence storage tank is-20-0 ℃;
the liquid in the low-temperature essence storage tank is essence stock solution;
the adsorbent is honeycomb activated carbon or molecular sieve adsorbent;
the desorption adopts inert gas as desorption medium;
the inert gas is nitrogen;
the temperature of the inert gas as a desorption medium is 80-100 ℃;
the condensation temperature is-50 ℃ to 0 ℃.
2. The use of the essence stock solution recovered from the waste gas discharged from the reconstituted tobacco concentration process in flavoring reconstituted tobacco as claimed in claim 1, wherein the essence stock solution is prepared by the following steps: when the essence microcapsule is applied, 5g of essence stock solution is taken as a core material for preparing the microcapsule, a mixed solution obtained by dissolving 12.5g of isolated soy protein and 12.5g of cyclodextrin in 250mL of distilled water is taken as a wall material solution for preparing the essence microcapsule, then the core material solution and the wall material solution are stirred at a high speed according to the mass ratio of 1: 3 at a temperature of below 10 ℃ to obtain an emulsion, then the emulsion is spray-dried to obtain the essence microcapsule, and then the obtained essence microcapsule is added into a coating liquid for use;
adding the essence microcapsules into the coating liquid, wherein the addition amount of the essence microcapsules is 0.5% by mass based on the mass of the essence stock solution, coating reconstituted tobacco at a coating rate of 39%, and drying, shredding and processing cigarettes to obtain reconstituted tobacco;
the essence stock solution contains odor substances with various fruit tastes, substances with caramel odor and substances with strong rose fragrance, has the characteristics of mellow fragrance, less miscellaneous gas and soft and exquisite smoke, and can reduce the irritation of reconstituted tobacco;
the essence stock solution is obtained by recovering waste gas discharged from a reconstituted tobacco concentration process, the recovery method comprises a normal-temperature absorption recovery treatment process and a low-temperature adsorption recovery treatment process which are sequentially carried out, and the method comprises the following specific steps:
(1) waste gas discharged in the concentration process enters absorption liquid, the absorption liquid is a mixed solution of ethanol and propylene glycol with the volume ratio of 1:1, the volume of the absorption liquid is 5L, the temperature of the absorption liquid is 30 ℃, and after absorption is carried out for 6 hours, the obtained absorption liquid is saturated and is subjected to supercritical carbon dioxide extraction;
(2) supercritical carbon dioxide extraction conditions: extracting at 60 deg.C under 25 MPa for 1 hr with propylene glycol as entrainer and 0.1mL/min flow rate, transferring the residual liquid to low-temperature essence storage tank at 0 deg.C;
(3) and (2) cooling the waste gas discharged after absorption by the absorption liquid in the step (1) to 10 ℃, adsorbing the cooled waste gas by an adsorbent filled with a zeolite molecular sieve for 5h to reach saturation, desorbing by using high-temperature nitrogen to form high-concentration aroma, condensing the high-concentration aroma at the temperature of-40 ℃, transferring the condensed essence liquid into a low-temperature essence storage tank, and uniformly mixing the condensed essence liquid with the extracted residue in the step (2) to obtain essence stock solution.
3. A method for flavoring reconstituted tobacco by using essence stock solution recovered from waste gas discharged in a reconstituted tobacco concentration process is characterized by comprising the following steps of: taking an essence stock solution as a core material solution for preparing essence microcapsules, taking a mixed solution of soy protein isolate and cyclodextrin as a wall material solution for preparing the essence microcapsules, stirring the core material solution and the wall material solution according to the mass ratio of 1: 1-3, uniformly dispersing to obtain an emulsion, performing spray drying to obtain the essence microcapsules, and adding the obtained essence microcapsules into a coating liquid for use;
the adding amount of the essence stock solution in the coating liquid is 0.1-1% by mass of the essence stock solution;
the essence stock solution contains odor substances with various fruit tastes, substances with caramel odor and substances with strong rose fragrance, has the characteristics of mellow fragrance, less miscellaneous gas and soft and exquisite smoke, and can reduce the irritation of reconstituted tobacco;
the essence stock solution is obtained by recovering waste gas discharged in the reconstituted tobacco concentration process, and comprises a normal-temperature absorption recovery treatment process and a low-temperature adsorption recovery treatment process which are sequentially carried out;
the normal-temperature absorption recovery treatment process comprises the following steps: recording waste gas discharged in the reconstituted tobacco concentration process as primary waste gas, absorbing the primary waste gas by an absorption liquid at 15-35 ℃ and then discharging secondary waste gas, wherein the absorption liquid is a mixed solution of ethanol and propylene glycol in any proportion; and (3) carrying out supercritical carbon dioxide extraction on the absorption liquid obtained after absorption, wherein the supercritical carbon dioxide extraction conditions are as follows: extracting at the pressure of 10-30 MPa and the temperature of 35-65 ℃ for 1-3 hours, wherein the entrainer is propylene glycol or absolute ethyl alcohol, the flow rate is 0.05-0.15 mL/min, and the residual liquid after extraction is transferred to a low-temperature essence storage tank;
the low-temperature adsorption recovery treatment process comprises the following steps: cooling the secondary waste gas to 0-10 ℃, adsorbing and enriching aroma components by using an adsorbent, desorbing the adsorbent obtained after adsorption, condensing the high-concentration aroma obtained by desorption, and transferring the condensed high-concentration aroma to the low-temperature essence storage tank, wherein the working temperature of the low-temperature essence storage tank is-20-0 ℃;
the liquid in the low-temperature essence storage tank is essence stock solution;
the adsorbent is honeycomb activated carbon or molecular sieve adsorbent;
the desorption adopts inert gas as desorption medium;
the inert gas is nitrogen;
the temperature of the inert gas as a desorption medium is 80-100 ℃;
the condensation temperature is-50 ℃ to 0 ℃.
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| CN102326859A (en) * | 2011-06-30 | 2012-01-25 | 红云红河烟草(集团)有限责任公司 | Method for extracting tobacco fragrance perfumes from waste gas during processing of cigarettes |
| CN102864016A (en) * | 2012-09-26 | 2013-01-09 | 云南烟草科学研究院 | Microcapsule rose essential oil and application thereof in tobacco |
| CN105606745A (en) * | 2015-11-27 | 2016-05-25 | 中山大学惠州研究院 | Detection method for odor substances in exhaust gas of perfume and essence industry |
| CN107153014A (en) * | 2016-03-02 | 2017-09-12 | 上海烟草集团有限责任公司 | A kind of detection method of papermaking-method reconstituted tobaccos material breath composition |
| CN108402263A (en) * | 2018-04-23 | 2018-08-17 | 大闽食品（漳州）有限公司 | A kind of concentration of coffee recycles integration apparatus with fragrance |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102326859A (en) * | 2011-06-30 | 2012-01-25 | 红云红河烟草(集团)有限责任公司 | Method for extracting tobacco fragrance perfumes from waste gas during processing of cigarettes |
| CN102864016A (en) * | 2012-09-26 | 2013-01-09 | 云南烟草科学研究院 | Microcapsule rose essential oil and application thereof in tobacco |
| CN105606745A (en) * | 2015-11-27 | 2016-05-25 | 中山大学惠州研究院 | Detection method for odor substances in exhaust gas of perfume and essence industry |
| CN107153014A (en) * | 2016-03-02 | 2017-09-12 | 上海烟草集团有限责任公司 | A kind of detection method of papermaking-method reconstituted tobaccos material breath composition |
| CN108402263A (en) * | 2018-04-23 | 2018-08-17 | 大闽食品（漳州）有限公司 | A kind of concentration of coffee recycles integration apparatus with fragrance |
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