周向型加热卷烟烟芯段逐口热解过程的空间表征
Study on the spatial characterization of the puff-by-puff pyrolysis process in circumferentially heated cigarette core segments
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摘要: 【目的】探究周向型加热卷烟逐口抽吸过程中不同部位烟芯材料的热解过程。【方法】以逐口抽吸后的加热卷烟烟芯材料为原料,采用自研空间分离方法,将其从空间上分离为9个不同部位,并采用热重分析仪和氢火焰离子化质谱(GC-FID)进行分析,考查逐口抽吸后不同部位烟芯材料的理化特性差异。【结果】逐口抽吸过程中烟芯的炭化区域随抽吸口数增加,由中后段外层逐步向内层、前段扩散,最终抽吸段结束时烟芯整体发生明显炭化。烟芯材料的热解过程可分为4个阶段,其中阶段Ⅱ为主要的热失重阶段,对应热失重温度区间为209~415 ℃,DTG曲线上峰A主要由烟芯材料中甘油、烟碱和1,2-丙二醇等化学成分的受热释放所引起。随抽吸口数增加,相同部位烟芯材料DTG曲线峰A的最大质量损失速率整体上呈降低趋势;第5口抽吸后,不同部位烟芯材料DTG曲线峰A的最大质量损失速率呈现径向上按前内、前中、前外和轴向上前内、后内、中内顺序由大到小的变化趋势。逐口抽吸过程中,甘油、烟碱和1,2-丙二醇在烟芯材料中的总残留量逐口降低;抽吸结束后,这3种成分在烟芯材料中的总残留量分别为初始含量的21.90%,2.98%和0.31%。逐口抽吸过程中,甘油、烟碱和1,2-丙二醇在烟芯材料中的残留量在径向上均呈现按内层、中层、外层顺序由大到小的分布,在轴向上由大到小的顺序由前段、中段、后段变为前段、后段、中段的分布。【结论】不同化合物在烟芯材料中残留量的逐口变化情况与其热解特性相一致,其在烟芯材料的空间分布情况受到温度和其沸点的影响。Abstract: 【Objective】This study aimed to investigate the pyrolysis process of tobacco core materials at different positions in circumferentially heated cigarettes during puff-by-puff smoking.【Methods】Tobacco core materials from heated cigarettes after puff-by-puff smoking were used as raw materials. A self-developed spatial separation method was used to divide the tobacco core into nine different positions. A thermogravimetric analyzer and gas chromatography-flame ionization detection (GC-FID) were used to analyze the physicochemical property differences of tobacco core materials at different positions after puff-by-puff smoking.【Results】During puff-by-puff smoking, the carbonization region of the tobacco core gradually spread from the outer layer of the middle-rear section to the inner layer and the front section with increasing puff number, and the entire tobacco core showed significant carbonization by the end of the smoking session. The pyrolysis process of tobacco core materials could be divided into four stages, among which Stage Ⅱ was the main mass-loss stage, corresponding to a temperature range of 209~415 ℃. Peak A on the DTG curve mainly resulted from the thermal release of chemical components such as glycerol, nicotine, and 1,2-propanediol in the tobacco core materials. With increasing puff number, the maximum mass-loss rate of Peak A on the DTG curve for tobacco core materials at the same position showed an overall decreasing trend. After the fifth puff, the maximum mass-loss rate of Peak A on the DTG curve for tobacco core materials at different positions decreased in the order of front-inner, front-middle, and front-outer in the radial direction, and in the order of front-inner, rear-inner, and middle-inner in the axial direction. During puff-by-puff smoking, the total residual amounts of glycerol, nicotine, and 1,2-propanediol in the tobacco core materials decreased puff by puff. After the smoking session, the total residual amounts of the three components in the tobacco core materials were 21.90%, 2.98%, and 0.31% of their initial contents, respectively. During puff-by-puff smoking, the residual amounts of glycerol, nicotine, and 1,2-propanediol in the tobacco core materials all decreased in the order of inner layer, middle layer, and outer layer in the radial direction, while their decreasing order in the axial direction changed from front section, middle section, and rear section to front section, rear section, and middle section.【Conclusion】The puff-by-puff changes in the residual amounts of different compounds in tobacco core materials were consistent with their pyrolysis characteristics, and their spatial distribution in the tobacco core materials was affected by temperature and their boiling points.
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Key words:
- heated tobacco product /
- thermogravimetric analysis /
- GC-FID /
- spatial characterization
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