Abstract The considerable amounts of alkaloids in tobacco stem (TS) make it wasteful and environmentally detrimental to directly pyrolyze it. This paper reveals the effects of leaching treatments with different solvents (hydrochloric acid, water and ethyl alcohol) on the pyrolysis characteristics of TS using TG-FTIR and Py-GC–MS. Alkaloids mainly consisting of nicotine were almost completely removed by leaching treatments, leading to the reduction of the N content in treated samples and the reduction of N-containing compounds in the obtained tar by Py-GC–MS. Potassium and calcium, which are the two main cations in TS, were removed completely by acid leaching, whereas calcium is resistant to water and alcohol. The removal of inorganic species in leached samples reduced the stability of TS at low temperatures (

中文翻译：

---

不同溶剂浸出处理后烟梗的热解特性

摘要 烟梗 (TS) 中大量的生物碱使其直接热解既浪费又对环境有害。本文使用 TG-FTIR 和 Py-GC-MS 揭示了不同溶剂（盐酸、水和乙醇）浸出处理对 TS 热解特性的影响。通过浸出处理，主要由尼古丁组成的生物碱几乎被完全去除，导致处理样品中 N 含量降低，Py-GC-MS 得到的焦油中含 N 化合物也减少。钾和钙是 TS 中的两个主要阳离子，通过酸浸完全去除，而钙对水和酒精具有抗性。浸出样品中无机物种的去除降低了 TS 在低温下的稳定性（