Nicotine purification evaluation device and method

Abstract

The invention provides a nicotine purification evaluation device and method. The nicotine purification evaluation device comprises a nicotine preparation unit, a nicotine concentration correction unit, a nicotine evaluation unit and a tail gas treatment unit which are connected in sequence, the nicotine preparation unit is used for preparing gaseous nicotine with specific concentration; the nicotine concentration correction unit comprises a condensation bath, a condensation pipeline, a flow meter and a pipeline heater and is used for correcting nicotine parameters; the nicotine evaluation unit comprises a plurality of sample absorption groups arranged in parallel and a straight discharge pipeline, and is used for adsorbing nicotine; the tail gas treatment unit is connected to the output side of the nicotine evaluation unit and is used for absorbing redundant tail gas. The scheme has the advantages of being special for nicotine purification evaluation, controllable in nicotine preparation parameter and high in purification evaluation flexibility.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco detection, and in particular to a nicotine purification evaluation device and method. Background Art

[0002] In the research direction of flue gas purification, a comprehensive evaluation method is usually adopted, that is, the flue gas is uniformly passed through the purification material, and then the concentration or composition of the flue gas after purification is observed, and the composition of the substance intercepted on the purification material is detected. By comparing with the concentration and composition of the standard gas used, a conclusion is obtained to evaluate the purification performance of the current purification material.

[0003] However, in the process of further research, smoke has been divided in detail according to its components. Environmental smoke mainly consists of two parts: gas phase and particle phase, which include many chemical components. Nicotine is recognized as one of the substances that need to be purified first. Therefore, the research on the purification performance of nicotine by the developed purification materials becomes very necessary. Nicotine is relatively special in environmental smoke and mainly exists in gas phase. Therefore, providing a purification evaluation device dedicated to nicotine is a technical problem that urgently needs to be solved.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The object of the present invention is to address the deficiencies of the prior art and thereby provide a nicotine purification evaluation device and method which are specifically used for nicotine purification evaluation, have controllable nicotine preparation parameters, and have high purification evaluation flexibility.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a nicotine purification evaluation device, comprising a nicotine preparation unit, a nicotine concentration correction unit, a nicotine evaluation unit and an exhaust gas treatment unit connected in sequence; The nicotine preparation unit is used to prepare gaseous nicotine of a specific concentration; The nicotine concentration correction unit comprises a condensation bath, a condensation pipe, a flow meter and a pipe heater. The main body of the condensation pipe is placed in the condensation bath. The pipe heater is connected to the outside of the pipe at the inlet and outlet ends of the condensation pipe. The flow meter is arranged at the pipe at the outlet side of the condensation pipe. The temperature of the pipe heater at the inlet side of the condensation pipe is higher than the temperature of the condensation bath. The temperature of the pipe heater at the outlet side of the condensation pipe is equal to the temperature of the condensation bath. The inlet end of the condensation pipe is connected to the outlet of the nicotine preparation unit and is provided with a switch valve. The outlet of the flow meter is connected to the inlet of the nicotine evaluation unit. The nicotine evaluation unit comprises a plurality of sample absorption groups and direct discharge pipes arranged in parallel, wherein the sample absorption group comprises a switch valve, a first sample tube, a second sample tube and a suction pump connected in series in sequence, wherein the switch valve is used to determine whether the current sample absorption group is enabled, the first sample tube and the second sample tube are both filled with the same purification material, and the suction pump is used to provide airflow power; the purification materials in different sample absorption groups are the same or different; the direct discharge pipe comprises a switch valve and a pipe connecting the nicotine correction unit and the tail gas treatment unit; The tail gas treatment unit is connected to the output side of the nicotine evaluation unit and is used to absorb excess tail gas.

[0007] Based on the above, the nicotine preparation unit includes a syringe pump, a steam vaporizer, a first carrier gas bottle, a second carrier gas bottle and a gas mixing chamber; The outlet of the injection pump and the outlet of the first carrier gas bottle are connected to a steam vaporizer for generating gaseous nicotine; The outlet of the steam vaporizer is connected to the gas mixing chamber with the second carrier gas bottle, so as to adjust the concentration of the generated nicotine to a set value; The temperature of the pipeline heater is higher than the temperature of the condensation bath, the purpose of which is to increase the temperature of the environment where the nicotine is located and prevent the condensation of nicotine from affecting the concentration correction; The condensation bath is used to purify nicotine, provide pure nicotine vapor, and further correct the nicotine generation concentration. The outlet of the gas mixing chamber is connected to the inlet end of the condensation pipeline through a switch valve.

[0008] Based on the above, the nicotine preparation unit includes a syringe pump, a steam vaporizer and a first carrier gas bottle; The outlet of the injection pump and the outlet of the first carrier gas bottle are connected to a steam vaporizer for generating gaseous nicotine; The outlet of the steam evaporator is communicated with the inlet end of the condensation pipe.

[0009] Based on the above, a gas mixing chamber is arranged between the outlet end of the condensation pipe and the inlet end of the flow meter, and the gas mixing chamber is connected to the second carrier gas bottle to adjust the concentration of the generated nicotine to a set value.

[0010] Based on the above, the condensation pipe is a W-shaped pipe, and the condensation bath is temperature controlled by a water bath or an oil bath.

[0011] Based on the above, the weight of purification material varies between sample absorption groups.

[0012] Based on the above, the weights of the purification materials in the first sample tube and the second sample tube of the same group are different.

[0013] A nicotine purification evaluation method includes the nicotine purification evaluation device described above, and the evaluation is performed through the following steps: Preparing gaseous nicotine: preparing gaseous nicotine of a specific concentration by the nicotine preparation unit; Correcting gaseous nicotine: setting the pipe temperature on the inlet side of the condenser pipe to be at least 5°C higher than the temperature of the condensation bath, so that the gaseous nicotine enters the condensation pipe and is condensed at a constant temperature under the action of the condensation bath, correcting the parameters of the gaseous nicotine, and setting the pipe temperature on the outlet side of the condenser pipe to be the same as the condensation bath, so that the parameters of the output gaseous nicotine are stable, and controlling the flow rate of the output gaseous nicotine by a flow meter; Purification evaluation: According to the needs of the designed comparative experiment, the switch valves of different sample absorption groups are controlled to open, and the gaseous nicotine flows through the opened sample absorption groups and is adsorbed by the purification materials in the first sample tube and the second sample tube, and the tail gas is discharged into the tail gas treatment unit; in the non-purification evaluation state, the direct discharge pipe is opened, and the gaseous nicotine bypasses each sample absorption group and is directly absorbed and treated by the tail gas treatment unit; Pipeline purification: When the purification evaluation is completed, turn off the steam generator, keep the first carrier gas and the second carrier gas open, open the direct exhaust pipeline and let the tail gas treatment unit absorb and treat directly; Comparative analysis: The adsorption conditions of the purification materials in each sample tube are tested and analyzed offline to obtain the performance parameters of the purification materials.

[0014] Based on the above, the performance parameters refer to the saturated adsorption capacity and the adsorption retention rate.

[0015] The present invention has outstanding substantive features and significant progress compared to the prior art. Specifically, the present invention has the following advantages: 1. Due to the temporary preparation of gaseous nicotine in this scheme, the temperature of nicotine obtained in the preparation process of gaseous nicotine may be different under different parameter control. The concentration value of gaseous nicotine is corrected to a unified and accurate benchmark by means of first heating the pipeline, condensing bath and then cooling, which is conducive to the unification of reference parameters in the subsequent evaluation process.

[0016] 2. Gaseous nicotine is temporarily prepared by the nicotine preparation unit. By controlling the parameters of the carrier gas, injection pump, steam vaporizer, and gas mixing chamber, gaseous nicotine of different concentrations can be obtained, which is more comprehensive and flexible for the evaluation and analysis of comparative properties.

[0017] 3. The nicotine evaluation unit is provided with multiple groups of sample absorption groups connected in parallel, and two sample tubes are arranged in them to store the same purified samples, which can be used to evaluate the saturated adsorption capacity of the purified samples and also to evaluate the adsorption retention rate.

[0018] The present invention adopts the method of sample absorption group to evaluate the adsorption amount of the material. The first sample tube of the two sample tubes in the same group is used to evaluate the adsorption amount of the material, and the second sample tube is used to evaluate the penetration amount. Therefore, this evaluation device can be used to simultaneously evaluate the saturated adsorption amount and penetration amount of the purified sample at the same concentration or different concentrations. Different sample absorption groups can be used to evaluate the adsorption amount and penetration amount of the same material at different times, and can also be used to evaluate the adsorption amount and penetration amount of different materials at the same time.

[0019] 4. The purified samples used as evaluation items are finally subjected to off-line detection and analysis to obtain the amount of intercepted nicotine, which is more accurate than on-site component analysis of gaseous nicotine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a structural principle diagram of the nicotine purification evaluation device in Example 1 of the present invention.

[0021] Figure 2 1 is a structural principle diagram of a nicotine purification evaluation device in Example 2 of the present invention.

[0022] In the figure: 1. Nicotine preparation unit; 2. Nicotine concentration correction unit; 3. Nicotine evaluation unit; 4. Exhaust gas treatment unit; 11. Injection pump; 12. Steam vaporizer; 13. First carrier gas bottle; 14. Second carrier gas bottle; 15. Gas mixing chamber; 16. First switch valve; 21. Condensation bath; 22. Condensation pipeline; 23. Flow meter; 31. Second switch valve; 32. First sample tube; 33. Second sample tube; 34. Suction pump; 35. Direct discharge pipeline; 41. Anti-backflow bottle; 42. Liquid absorption bottle; 43. Active absorption tower. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0024] Example 1 like Figure 1 As shown, a nicotine purification evaluation device comprises a nicotine preparation unit 1, a nicotine concentration correction unit 2, a nicotine evaluation unit 3 and an exhaust gas treatment unit 4 which are connected in sequence.

[0025] The nicotine preparation unit 1 is used to prepare gaseous nicotine of a specific concentration. Specifically, the nicotine preparation unit 1 includes an injection pump 11, a steam vaporizer 12, a first carrier gas bottle 13, a second carrier gas bottle 14 and a gas mixing chamber 15; The outlet of the injection pump 11 and the outlet of the first carrier gas bottle 13 are connected to the steam vaporizer 12 for generating gaseous nicotine; The outlet of the steam vaporizer 12 and the second carrier gas bottle 14 are connected to the gas mixing chamber 15, which is used to adjust the concentration of the generated nicotine to a set value; The outlet of the gas mixing chamber 15 is connected to the inlet end of the condensation pipe 22 through the first switch valve 16 .

[0026] The main component in the injection pump 11 is nicotine. The carrier gas in the first carrier gas bottle 13 is used to initially dilute the vaporized nicotine. The carrier gas in the second carrier gas bottle 14 performs secondary dilution and mixing on the nicotine based on the gas mixing chamber 15 to form gaseous nicotine of a specific concentration.

[0027] The nicotine concentration correction unit 2 includes a condensation bath 21, a condensation pipe 22, a flow meter 23 and a pipe heater (not shown in the figure), wherein the condensation pipe is a W-shaped pipe, the main body of the condensation pipe 22 is placed in the condensation bath 21, and the condensation bath is temperature controlled by a water bath or an oil bath. The pipe heater is connected to the outside of the pipe at the inlet and outlet ends of the condensation pipe, and is used to heat the pipe, and can usually be provided in the form of a heating film.

[0028] The flow meter 23 is arranged at the pipe on the outlet side of the condensation pipe 22. The temperature of the pipe heater on the inlet side of the condensation pipe 22 is higher than the temperature of the condensation bath 21. In this embodiment, it is set to be 5°C higher. The temperature of the pipe heater on the outlet side of the condensation pipe 22 is equal to the temperature of the condensation bath 21. The inlet end of the condensation pipe 22 is connected to the outlet of the nicotine preparation unit 1 and is provided with a first switch valve 16. The outlet of the flow meter 23 is connected to the inlet of the nicotine evaluation unit 3.

[0029] Since the form of nicotine is greatly affected by temperature, the core function of the nicotine concentration correction unit 2 is to adjust the temperature of the generated gaseous nicotine to a uniform and balanced state. However, the controllability of the process for preparing nicotine is slightly poor, resulting in changes in the temperature of the generated gaseous nicotine. Therefore, the nicotine temperature can be adjusted to a uniform state through the nicotine concentration correction unit 2, and the nicotine concentration is more stable in the subsequent adsorption evaluation process.

[0030] The nicotine evaluation unit 3 includes a plurality of sample absorption groups and a straight discharge pipe 35 arranged in parallel. The sample absorption group includes a second switch valve 31, a first sample tube 32, a second sample tube 33 and a suction pump 34 connected in series in sequence. The second switch valve 31 is used to determine whether the current sample absorption group is enabled. The first sample tube 32 and the second sample tube 33 are both filled with the same purification material. The suction pump 34 is used to provide airflow power. The purification materials in different sample absorption groups are the same or different. In other embodiments, the weight of purification materials between sample absorption groups is different; the weight of purification materials in the first sample tube and the second sample tube of the same group is different. This specific difference design can be set according to the needs of the experimental design to facilitate the study of different purification performances.

[0031] For example, when the materials are the same, we can study the absorption saturation rate; when the materials are different, we can study the adsorption rate comparison; when the weight is the same, we can study the timeliness of purification; when the weight is different, we can study the relationship between weight and adsorption efficiency, and so on.

[0032] The direct discharge pipe 35 includes a switch valve and a pipe connecting the nicotine correction unit and the exhaust gas treatment unit.

[0033] The exhaust gas treatment unit 4 is connected to the output side of the nicotine evaluation unit and is used to absorb excess exhaust gas. In this embodiment, it includes an anti-backflow bottle 41, a liquid absorption bottle 42, and an activated carbon absorption tower 43 which are connected in sequence.

[0034] A nicotine purification evaluation method is evaluated by the following steps: Preparing gaseous nicotine: preparing gaseous nicotine of a specific concentration by the nicotine preparation unit; Correcting gaseous nicotine: setting the pipe temperature on the inlet side of the condenser pipe to be at least 5°C higher than the temperature of the condensation bath, so that the gaseous nicotine enters the condensation pipe and is condensed at a constant temperature under the action of the condensation bath, correcting the parameters of the gaseous nicotine, and setting the pipe temperature on the outlet side of the condenser pipe to be the same as the condensation bath, so that the parameters of the output gaseous nicotine are stable, and controlling the flow rate of the output gaseous nicotine by a flow meter; Purification evaluation: According to the needs of the designed comparative experiment, the switch valves of different sample absorption groups are controlled to open, and the gaseous nicotine flows through the opened sample absorption groups and is adsorbed by the purification materials in the first sample tube and the second sample tube, and the tail gas is discharged into the tail gas treatment unit; in the non-purification evaluation state, the direct discharge pipe is opened, and the gaseous nicotine bypasses each sample absorption group and is directly absorbed and treated by the tail gas treatment unit; In this embodiment, the tail gas treatment unit includes an anti-backflow bottle, a 5% hydrochloric acid aqueous solution absorption bottle, an ion exchange resin such as XAD-7 and a phosphoric acid mixture, and a porous polymer resin such as Tenax and an oxalic acid mixture.

[0035] Principle: The tail gas is treated in turn through a liquid absorption bottle and a solid absorption tower, and nicotine tail gas is treated through a variety of methods and materials.

[0036] Adsorption materials: (1) A 5% hydrochloric acid aqueous solution is used in the liquid absorption bottle to absorb nicotine. Hydrochloric acid and nicotine can react with each other to absorb part of the nicotine. At the same time, in order to prevent the solution from being sucked back, an anti-backflow bottle is placed in front of the 5% hydrochloric acid aqueous solution absorption bottle; (2) The solid adsorbent in the first solid absorption tower uses a compound of ion exchange resin XAD-7 and phosphoric acid (mass ratio 20:1). XAD-7 has strong adsorption performance, and the loaded phosphoric acid can react with nicotine. (3) The solid adsorbent in the second solid absorption tower uses a compound of activated carbon and oxalic acid (mass ratio 10:1). Activated carbon as a carrier can effectively adsorb nicotine, and oxalic acid can react with nicotine. Comparative analysis: The adsorption conditions of the purification materials in each sample tube are tested and analyzed offline to obtain the performance parameters of the purification materials.

[0037] The performance parameters mentioned are saturated adsorption capacity and adsorption retention rate.

[0038] Example 2 like Figure 2 As shown, the main difference between this embodiment and embodiment 1 is that: the nicotine preparation unit 1 includes a syringe pump 11, a steam vaporizer 12 and a first carrier gas bottle 13; The outlet of the injection pump 11 and the outlet of the first carrier gas bottle 13 are connected to the steam vaporizer 12 for generating gaseous nicotine; The outlet of the steam evaporator 12 is communicated with the inlet end of the condensation pipe 22 .

[0039] A gas mixing chamber 15 is provided between the outlet end of the condensation pipe 22 and the inlet end of the flow meter 23 . The gas mixing chamber 15 is connected to the second carrier gas bottle 14 and is used to adjust the concentration of the generated nicotine to a set value.

[0040] In this embodiment, nicotine is first prepared and the temperature is adjusted to a set temperature, and then carrier gas is added to adjust the concentration to a specific value. Compared with Embodiment 1, the nicotine temperature reaches the standard in advance, which can prevent nicotine from being lost due to temperature changes.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A nicotine purification evaluation device, characterized in that: It includes a nicotine preparation unit, a nicotine concentration correction unit, a nicotine evaluation unit and an exhaust gas treatment unit connected in sequence; The nicotine preparation unit is used to prepare gaseous nicotine of a specific concentration; The nicotine concentration correction unit comprises a condensation bath, a condensation pipe, a flow meter and a pipe heater. The main body of the condensation pipe is placed in the condensation bath. The pipe heater is connected to the outside of the pipe at the inlet and outlet ends of the condensation pipe. The flow meter is arranged at the pipe at the outlet side of the condensation pipe. The temperature of the pipe heater at the inlet side of the condensation pipe is higher than the temperature of the condensation bath. The temperature of the pipe heater at the outlet side of the condensation pipe is equal to the temperature of the condensation bath. The inlet end of the condensation pipe is connected to the outlet of the nicotine preparation unit and is provided with a switch valve. The outlet of the flow meter is connected to the inlet of the nicotine evaluation unit. The nicotine evaluation unit comprises a plurality of sample absorption groups and direct discharge pipes arranged in parallel, wherein the sample absorption group comprises a switch valve, a first sample tube, a second sample tube and a suction pump connected in series in sequence, wherein the switch valve is used to determine whether the current sample absorption group is enabled, the first sample tube and the second sample tube are both filled with the same purification material, and the suction pump is used to provide airflow power; the purification materials in different sample absorption groups are the same or different; the direct discharge pipe comprises a switch valve and a pipe connecting the nicotine correction unit and the tail gas treatment unit; The tail gas treatment unit is connected to the output side of the nicotine evaluation unit and is used to absorb excess tail gas.

2. The nicotine purification evaluation device according to claim 1, characterized in that: The nicotine preparation unit comprises a syringe pump, a steam vaporizer, a first carrier gas bottle, a second carrier gas bottle and a gas mixing chamber; The outlet of the injection pump and the outlet of the first carrier gas bottle are connected to a steam vaporizer for generating gaseous nicotine; The outlet of the steam vaporizer is connected to the gas mixing chamber with the second carrier gas bottle, so as to adjust the concentration of the generated nicotine to a set value; The outlet of the gas mixing chamber is connected to the inlet end of the condensation pipeline through a switch valve.

3. The nicotine purification evaluation device according to claim 1, characterized in that: The nicotine preparation unit comprises a syringe pump, a steam vaporizer and a first carrier gas bottle; The outlet of the injection pump and the outlet of the first carrier gas bottle are connected to a steam vaporizer for generating gaseous nicotine; The outlet of the steam evaporator is communicated with the inlet end of the condensation pipe.

4. The nicotine purification evaluation device according to claim 3, characterized in that: A gas mixing chamber is arranged between the outlet end of the condensation pipeline and the inlet end of the flow meter, and the gas mixing chamber is connected to the second carrier gas bottle for adjusting the concentration of the generated nicotine to a set value.

5. The nicotine purification evaluation device according to any one of claims 1 to 4, characterized in that: The condensation pipeline is a W-shaped tube, and the condensation bath is temperature controlled by a water bath or an oil bath.

6. The nicotine purification evaluation device according to claim 5, characterized in that: The weight of the purification material varied between sample absorption groups.

7. The nicotine purification evaluation device according to claim 6, characterized in that: The weight of the purification material in the first sample tube and the second sample tube of the same group is different.

8. A nicotine purification evaluation method, characterized in that: The nicotine purification evaluation device comprising any one of claims 1 to 7 is evaluated by the following steps: Preparing gaseous nicotine: preparing gaseous nicotine of a specific concentration by the nicotine preparation unit; Correcting gaseous nicotine: setting the pipe temperature on the inlet side of the condenser pipe to be at least 5°C higher than the temperature of the condensation bath, so that the gaseous nicotine enters the condensation pipe and is condensed at a constant temperature under the action of the condensation bath, correcting the parameters of the gaseous nicotine, and setting the pipe temperature on the outlet side of the condenser pipe to be the same as the condensation bath, so that the parameters of the output gaseous nicotine are stable, and controlling the flow rate of the output gaseous nicotine by a flow meter; Purification evaluation: According to the needs of the designed comparative experiment, the switch valves of different sample absorption groups are controlled to open, and the gaseous nicotine flows through the opened sample absorption groups and is adsorbed by the purification materials in the first sample tube and the second sample tube, and the tail gas is discharged into the tail gas treatment unit; in the non-purification evaluation state, the direct discharge pipe is opened, and the gaseous nicotine bypasses each sample absorption group and is directly absorbed and treated by the tail gas treatment unit; Comparative analysis: The adsorption conditions of the purification materials in each sample tube are tested and analyzed offline to obtain the performance parameters of the purification materials.

9. The nicotine purification evaluation method according to claim 8, characterized in that: The performance parameters mentioned are saturated adsorption capacity and adsorption retention rate.

Images