Despite the important niche and broad applicability of thermal remediation (TD), little work has been done to discuss chemical reactions of methylnaphthalene contaminated soil. The 2-methylnaphthalene desorption amount (MDA) of TD is studied here under different conditions, and the carbonation (chemically polymerized or condensed) behavior of 2-methylnaphthalene is explained by analyzing the changes of soil organic carbons (SOCs), off-gas products, and surface chemical properties. It indicates that the influence sequence of MDA from high to low is heating time, heating temperatures, and flow rates of carrier gas. MDA increases steadily with the increase of temperatures (200–300 °C) but decreases slightly after 300 °C; the reason may be the chemical conversion of 2-methylnaphthalene. GC-MS analysis of off-gas confirms that partial 2-methylnaphthalene is polymerized to form 2-methylbenzo[b]thiophene and 2,4-di-tert-butylpheno at 400 °C, which is the first step of carbonization process. The x-ray photoelectron spectroscopy results of soil indicate that the C content decreases, but C–(C, H) chemical structure increases, indicating that new carbonaceous substances are generated. A layer of “char” is seen by scanning electron microscope to be left on the surface of the soil particles. As the temperature increases (200–400 °C), the SOCs generally decreases from 1.14 to 0.82%, which is the result of the equilibrium between SOCs pyrolysis and 2-methylnaphthalene carbonization. Therefore, partial 2-methylnaphthalene turns into smaller organic molecules in desorption gas of TD, meanwhile is accompanied by its chemical conversion to non-volatile products, which are attached to remediated soils and then improve soil properties and increase their fertility.

尽管热修复（TD）具有重要的利基和广泛的适用性，但对于讨论甲基萘污染的土壤的化学反应，仍进行的工作很少。在不同条件下研究了TD的2-甲基萘解吸量（MDA），并通过分析土壤有机碳（SOCs），废气产物的变化来解释2-甲基萘的碳酸化（化学聚合或缩合）行为。以及表面化学性质。这表明MDA从高到低的影响顺序是加热时间，加热温度和载气流速。MDA随着温度（200–300°C）的增加而稳定增加，但在300°C之后则略有下降；原因可能是2-甲基萘的化学转化。废气的GC-MS分析证实，部分2-甲基萘在400°C聚合形成2-甲基苯并[b]噻吩和2,4-二叔丁基苯，这是碳化过程的第一步。土壤的X射线光电子能谱结果表明，碳含量降低，但C–（C，H）化学结构增加，表明生成了新的碳质物质。通过扫描电子显微镜观察到一层“炭”残留在土壤颗粒的表面上。随着温度的升高（200–400°C），SOC通常从1.14％下降到0.82％，这是SOC热解和2-甲基萘碳化之间平衡的结果。因此，部分2-甲基萘在TD的解吸气体中变成较小的有机分子，