Formaldehyde solution (37%), acetone, and sodium sulfite were provided by Sinopharm Chemical Reagent Co., Ltd. HOCH2SO3Na (97%) and phenol were provided by Maclin Co., Ltd. o-Cresol was provided by Aladdin Co., Ltd. 3,5-Dimethylphenol was provided by Tokyo Chemical Industry Co., Ltd. Mixed phenol was prepared by compounding with a mass ratio of 34.76% phenol, 40.82% o-cresol, and 24.42% 3,5-Dimethylphenol (based on the composition of coal tar creosote). Coal tar creosote was supplied by Juye Runjia Chemical Co., Ltd. Yulin coal samples were kindly donated by Shandong Hualu-Hengsheng Chemical Co., Ltd. Proximate and ultimate analysis data of raw coal samples are shown in Table 1, and their size distribution is shown in Fig. 1.
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