[目的]探究加热卷烟再造烟叶中丙三醇的热裂解机制.[方法]从热力学和动力学角度系统探索酸性环境下丙三醇的热裂解机理,预测反应的主要路径与产物,采用热重分析仪和超高效液相色谱考察不同 pH 值再造烟叶中丙三醇热裂解产生的羰基化合物含量.[结果](1)丙三醇与质子 H 相结合后,较中性环境更容易发生热裂解,其主要反应路径为脱水历程,主要产物为水、甲醛、质子化乙烯醇(乙醛)以及质子化的丙烯醛,酸性环境下的乙醛可进一步缩合生成巴豆醛.(2)200℃时,检测到再造烟叶(pH值 4.74)中丙三醇热裂解产生甲醛和乙醛,与中性环境相比,其发生热裂解所需的温度降低,且同温度下热裂解产生的主要羰基化合物含量明显更高.(3)添加强酸调节 pH 后,随酸性的提升,丙三醇的热裂解反应明显加剧,所产生的甲醛、丙烯醛和巴豆醛含量显著升高.
Study on the pyrolysis mechanism of glycerol in reconstituted tobacco for heated tobacco products
This study aims to explore the pyrolysis mechanism of glycerol in reconstituted tobacco of heated tobacco products.The pyrolysis mechanism of glycerol under acidic conditions was systematically investigated from thermodynamic and kinetic perspectives.The main reaction pathways and products were predicted,and the content of carbonyl compounds produced by the pyrolysis of glycerol in reconstituted tobacco at different pH values was examined using thermogravimetric(TG)analysis and ultra-high-performance liquid chromatography(UPLC)..The results showed that:(1)Glycerol combined with proton H and underwent pyrolysis more readily in an acidic environment than in a neutral one.The main reaction pathway involved dehydration,with water,formaldehyde,protonated enol(acetaldehyde),and protonated acrolein as the main products.Acetaldehyde can further condense to form crotonaldehyde in an acidic environment.(2)At 200℃,formaldehyde and acetaldehyde were detected from the pyrolysis of glycerol in reconstituted tobacco(pH 4.74).Compared with neutral environment,the temperature required for pyrolysis of glycerol was lower,and the content of main carbonyl compounds produced by pyrolysis increased obviously at the same temperature.(3)After adding a strong acid to adjust the pH,the pyrolysis reaction of glycerol intensified with increasing acidity,resulting in significantly higher levels of formaldehyde,acrolein,and crotonaldehyde.
万方数据
维普
