Alkanolysis has become an effective approach for lignite extraction due to high organic oxygen content in lignite. To better understand the effect of isopropanolysis on the chemical structure and thermal degradation process of lignite, Wucaiwan lignite (WL) and isopropanolyed residue (R_I) were systematically analyzed using four multiple direct tools, including Fourier transform infrared spectrometer (FTIRS), X-ray photoelectron spectrometer (XRPES), Thermogravimetric analysis (TGA), and Pyrolysis-gas chromatography/mass spectrometry (PGC/MS). Combining with the analysis of FTIRS and XRPES, much oxygen-containing species were extracted from WL during isopropanolysis process (IP), and R_I has higher carbon content than WL. Kinetic parameters such as activation energy (E_a) and pre-exponential factor (A) were determined by using two model-free methods of Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO). Average E_a for WL pyrolysis was 235.4 and 235.7 kJ mol⁻¹, respectively, obtained by KAS and FWO methods, were lower than that of R_I (354.4 and 351.3 kJ mol⁻¹). Besides, based on the obtained kinetics data, thermodynamic analysis was established to evaluate the pyrolysis complexity of WL and R_I. PGC/MS results showed that the main volatile products (VPs) of R_I fast pyrolysis (FP) were arenes and alkanes while formation of oxygenated compounds reduced, further confirming the extraction of oxygen-containing species from IP of WL. It is noteworthy that isopropanolysis pretreatment of WL can influence its chemical structure and thermal degradation process.

由于褐煤中有机氧含量高，碱解法已成为提取褐煤的有效方法。为了更好地理解isopropanolysis的化学结构和褐煤的热降解过程，五彩湾褐煤（WL）和isopropanolyed残基（R的影响_我）使用四个多个直接工具，包括傅立叶变换红外光谱仪（FTIRS）进行了系统分析，X-射线光电子能谱仪（XRPES），热重分析（TGA）和热解气相色谱/质谱（PGC / MS）。结合FTIRS和XRPES的分析，在异丙醇分解过程（IP）中从WL中提取了许多含氧物质，并且R _I的碳含量高于WL。动力学参数，例如活化能（E_a）和指数前因子（A）是通过使用Kissinger-Akahira-Sunose（KAS）和Flynn-Wall-Ozawa（FWO）的两种无模型方法确定的。通过KAS和FWO方法获得的WL热解的平均E _a分别为235.4和235.7 kJ mol ^-1，低于R _I的平均E _a（354.4和351.3 kJ mol ^-1）。此外，基于所获得的动力学数据，建立了热力学分析，评估WL和R的热解的复杂性_我。PGC / MS结果表明，R _I的主要挥发性产物（VPs）快速热解（FP）分别是芳烃和烷烃，同时减少了含氧化合物的形成，进一步证实了从WL的IP中提取了含氧物质。值得注意的是，WL的异丙醇分解预处理会影响其化学结构和热降解过程。