The optimum conditions of toluene insoluble-quinoline soluble fraction (TI-QS) obtained by n-heptane Soxhlet extraction residue of low-temperature coal tar (H-CT) reacted with formaldehyde were determined. And ¹H NMR and ¹³C NMR were employed to analyze the structure of H-CT and its reaction products (P-H-CT). The results show that the yield of TI-QS is the largest at the reaction conditions as follows: reaction temperature 90°C, reaction time 3 h and with 3 wt% addition of catalyst. The contents of aliphatic carbon and aromatic carbon bonded to oxygen are higher in H-CT. The contents of aliphatic CH₃ carbon and aromatic CH₃ carbon are higher in P-H-CT. The content of methylene decreases and the content of methane increases, but the decrease of methylene is larger than the increase of methane; therefore, CH/CH₂ carbon decreases slightly. The content of H_γ is 0.10 wt%, and the contents of H_α and H_β are all 0.25 wt% in P-H-CT. The H_γ, H_α and H_β ratios of P-H-CT to H-CT are small, displaying a lower branched degree of P-H-CT.

确定了低温煤焦油（H-CT）的正庚烷索氏提取残渣与甲醛反应制得的甲苯不溶喹啉可溶级分（TI-QS）的最佳条件。然后用¹ H NMR和¹³ C NMR分析H-CT及其反应产物（PH-CT）的结构。结果表明，在以下反应条件下，TI-QS的收率最高：反应温度为90°C，反应时间为3 h，添加了3 wt％的催化剂。在H-CT中，与氧结合的脂肪族碳和芳香族碳的含量较高。脂肪族CH ₃碳和芳香族CH ₃的含量PH-CT中的碳含量更高。亚甲基含量减少，甲烷含量增加，但亚甲基含量的减少大于甲烷含量的增加；因此，CH / CH ₂碳略有减少。H的含有_γ为0.10％（重量），和H的含量_α和H _β是在PH-CT所有0.25％（重量）。为H _γ，H _α和H _β PH-CT到H-CT的比率是小的，显示PH-CT的低级支链度。