No abstract

Glycerin and propylene glycol are the main components of the atomizing agent in heat-not-burn tobacco products (HnB), which affect the smoke release of HnB significantly. In this study, the roles of the glycerin and propylene glycol as the atomizing agent on smoke release of HnB were studied by using a fixed-bed reactor system. The effects of glycerin to propylene glycol ratio in the atomizing agent, and the content of atomizing agent in the HnB were investigated. Gas chromatography-mass spectrometer (GC-MS) was used to analyze the condensable components in the released smoke, and gas chromatography (GC) was used to analyze the gaseous products. The results showed that glycerol could promote the thermal cracking of tobacco and smoke release during pyrolysis. The amount of smoke was the largest when the glycerol ratio was 60%, meanwhile the nicotine content in the smoke was also the highest. When using the glycerin and propylene glycol mixture as the atomizing agent, the amount of smoke and concentration of nicotine and CO in the smoke were increased when the content of atomizing agent decreased in the HnB. The results indicated that the interactions between glycerin and propylene glycol, and the interactions between the atomizing agent and the tobacco were both existed during smoking, which could change the characteristics of the atomizing agent and the smoke release property of HnB.

No abstract

In order to clarify the reasons for the good smoke release characteristics of IQOS, the factors that are beneficial to the smoke release characteristics of IQOS were studied by comparing the K (the amount of released smoke was less) and IQOS. The components of IQOS and K which were easy to be released were characterized by the GC-MS. The thermal release characteristics of IQOS, K and the original tobacco powders of K were characterized by the thermogravimetric analyzer (TG). The main compounds of the released smoke of IQOS and K were characterized by Py/GC-MS at two typical heating temperatures (260 and 330°C). The results show that: 1) the actual heating temperature of the IQOS was higher (330°C), which could promote the release of smoke. 2) IQOS tobacco stick has a porous structure with higher specific surface area, which was beneficial to the release of smoke. 3) IQOS contains more components which were easy to be released, thus the high concentration of smoke could be formed. 4) Though the content of the atomization agent in IQOS was lower than that in K, more atomization agent in IQOS could be released at the tobacco cracking temperature (330°C), thus the atomization property of IQOS was better.

No abstract

In order to reveal the release characteristics of different tobacco materials, the characteristics of tobacco materials and the release characteristics of smoke were analyzed. This paper studied 17 kinds of tobacco materials, the thermogravimetric analyzer was used to study the thermogravimetric characteristics of the tobacco materials, meanwhile the gas chromatography was used to analysis original aroma composition characteristics of the raw tobacco material, the smoke released from the pyrolysis of tobacco in a fixed bed reactor was also studied. The results showed: ① The elemental composition of different kinds of tobacco materials was similar, but there were significant differences in the volatile content (aroma components), among which the aroma components of tobacco stem were the highest. ②Different categories of tobacco raw materials have different properties of the aroma components. Among them, the nicotine content of roasted tobacco was higher, spice tobacco and tobacco stems mainly contain acid and ketone aroma components. However, burley tobacco and cigar tobacco are distinguished from other types of tobacco by the presence of aromatic substances such as new phytodiene.③ Through the analysis of thermal release characteristics of aroma components of different tobacco raw materials, it was found that the yield of aroma components was positively correlated with the volatile content of tobacco materials. The results of this study clarified the effects of different tobacco raw materials on the release characteristics of aroma components and provided theoretical guidance for the subsequent compound utilization of tobacco.

To reveal the characteristics of pyrolytic oil production from the thermal cracking of tobacco stem waste at different temperatures and oxygen concentrations, experimental studies of tobacco stem thermal cracking at 300-800°C and oxygen concentrations of 0-8% were carried out using a fixed-bed reactor, and the pyrolytic oil composition was analyzed by the gas chromatography-mass spectrometry (GC-MS) and the ultraviolet fluorescence spectroscopy (UV-F). The results showed that: 1.Thermal cracking of tobacco stem could produce about 23.25-39.50 wt% of pyrolytic oil, and the oil yield reached the highest at 500°C; 2.Increasing oxygen concentration could promote the oxidative consumption of volatiles, leading to the decrease of pyrolytic oil yield; 3.Nicotine yield reached the highest value at 500°C when oxygen concentration was 0% and 4%, 7.0 mg and 9.5 mg (per g of tobacco), respectively. When the oxygen concentration was 8%, the nicotine yield reached the highest value of 7.8 mg (per g of tobacco) at 400°C. 4.Under an inert atmosphere, high temperature inhibited the production of acids, ketones, aldehydes, alcohols, and heterocyclic substances and promoted the production of phenols, while oxidizing atmosphere helped to produce phenols, heterocyclic substances, and aromatic substances. 5.High temperature and oxidizing atmosphere significantly promoted the production of macrocyclic aromatic compounds. The results of this paper clarify the effects of reaction temperature and oxygen concentration on the generation characteristics of pyrolytic oil in the thermal cracking process of tobacco stem and provide theoretical guidance for the pyrolysis utilization of tobacco stem waste.

In order to reveal the release characteristics of different tobacco materials, the characteristics of tobacco materials and the release characteristics of smoke were analyzed. This paper studied 17 kinds of tobacco materials, the thermogravimetric analyzer was used to study the thermogravimetric characteristics of the tobacco materials, meanwhile the gas chromatography was used to analysis original aroma composition characteristics of the raw tobacco material, the smoke released from the pyrolysis of tobacco in a fixed bed reactor was also studied. The results showed: ① The elemental composition of different kinds of tobacco materials was similar, but there were significant differences in the volatile content (aroma components), among which the aroma components of tobacco stem were the highest. ②Different categories of tobacco raw materials have different properties of the aroma components. Among them, the nicotine content of roasted tobacco was higher, spice tobacco and tobacco stems mainly contain acid and ketone aroma components. However, burley tobacco and cigar tobacco are distinguished from other types of tobacco by the presence of aromatic substances such as new phytodiene.③ Through the analysis of thermal release characteristics of aroma components of different tobacco raw materials, it was found that the yield of aroma components was positively correlated with the volatile content of tobacco materials. The results of this study clarified the effects of different tobacco raw materials on the release characteristics of aroma components and provided theoretical guidance for the subsequent compound utilization of tobacco.