低氧加热状态下温度对加热卷烟用再造烟叶热转化的影响
Effect of temperature on pyrolysis characteristic of reconstituted tobacco for heated tobacco products under low-oxygen heating condition
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摘要: 为探究低氧条件下加热温度对烟草热解释放物及固相残余物理化结构演变的影响规律,使用管式炉反应器实现低氧条件下不同加热温度再造烟叶烟气成分捕集及固相残余物制备,通过GC-MS分析系统完成代表性烟气成分检测,并采用多种分析表征技术检测固相残余物的微观结构和化学组成。结果表明:再造烟叶受热过程中,甘油、丙二醇、烟碱等基础物质受热后多直接转移至烟气气溶胶中,巴豆醛、羟基丙酮、异戊二烯等随温度升高释放量增加,萘随温度升高释放量降低,愈创木酚、甲酚、苯酚、2,3-丁二酮、1-羟基-2-丁酮、2(5H)-呋喃酮等随温度变化呈现波动性,烟气中以异戊二烯为代表的低温裂解挥发性化合物相对含量随温度的升高而增加;固相残余物纤维骨架灰化程度随温度的升高而增加,370℃之前再造烟叶主要以低沸点物质的挥发/蒸馏及半纤维素和纤维素的脱羟/脱羧反应为主,随温度升高热解过程中存在氧化反应,且再造烟叶表面上更稳定的含氧官能团相对含量突增。Abstract: To investigate the influence of heating temperature on the evolution of physical and chemical structures of thermal interpreted emissions and solid phase residues in tobacco under low-oxygen atmosphere, a tubular furnace reactor was used to capture the smoke components of reconstituted tobacco leaves at different heating temperatures under low oxygen concentration and prepare solid phase residues. Representative smoke components were detected by GC-MS, and various analysis and characterization techniques were used to detect the microstructure and chemical composition of solid phase residues. The results showed that during the heating process of reconstituted tobacco leaves, the basic substances such as glycerol, propylene glycol, and nicotine were mostly directly transferred to the smoke aerosol after being heated. The release of crotonaldehyde, hydroxyacetone, isoprene, and benzene derivatives increased with increasing temperature, while the release of naphthalene decreased with increasing temperature. Phenolic ketone components such as guaiacol, cresol, phenol, 2,3-butanedione, 1-hydroxy-2-butanone, and 2 (5H)-furanone exhibited fluctuations with temperature changes; The representative volatile compounds represented by low-temperature cracking of isoprene in flue gas increase with the increase of temperature; The degree of ashing of the solid residue fiber skeleton increases with the increase of temperature; Before 370 ℃, the reconstituted tobacco leaves were mainly characterized by volatilization, distillation, and the dehydroxylation/decarboxylation of hemicellulose and cellulose. With the increase of temperature, there was an oxidation reaction in the pyrolysis process, and the proportion of more stable oxygen containing functional groups on the surface of the reconstituted tobacco leaves increased sharply.
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