烟草热失重质量损失与苯酚释放量的关系

为预测各单等级烟草热解时苯酚的释放量变化,选用15 种代表性的烟草样品(13 种国内外不同产地的单等级烟丝、1 种再造烟叶丝和1 种梗丝),采用热失重与烟草热解实验相结合的方法,建立了烟草热失重质量损失与苯酚释放量的数学关系,并用5 种单料烟进行了验证。结果表明:烟草在200~400 ℃温度段热解时,半纤维素、纤维素和木质素是苯酚的主要来源,其中木质素的贡献最大;除再造烟叶丝外,其他烟草样品苯酚释放量随3 种物质质量损失的增大呈线性增加趋势。在标准抽吸模式下,5 种单料烟烟气中苯酚的释放量检测结果与通过数学关系预测的结果基本一致。该方法简单、快速、准确,适用于预测各单等级烟草苯酚的释放量。 

Relationship Between Thermal Mass Loss and Phenol Release of Tobacco During Pyrolysis Process

In order to predict the phenol release of tobacco, 15 representative tobacco samples (13 cut tobacco samples of single grade from different growing areas, 1 cut reconstituted tobacco sample, 1 cut stem sample) were selected and studied by combining thermogravimetric analysis with pyrolysis experiment, and the mathematical relationship between the thermal mass loss and phenol release of tobacco during pyrolysis process was established and verified with 5 cigarette samples made of single grade tobacco. The results showed that: phenol mainly came from the decomposition of hemicellulose, cellulose and lignin at 200-400 ℃, especially lignin. Except for cut reconstituted tobacco, the release of phenol increased linearly with the increase of mass loss of hemicellulose, cellulose and lignin in the samples. Under standard smoking regime, the phenol release of the 5 cigarette samples for validation basically agreed with the results predicted by the established mathematical relationship. This method is simple, rapid, accurate and suitable for predicting the phenol release of single grade tobacco.