不同等级煤与油共炼的转化率差异及残渣分析

选取安徽褐煤、辽宁褐煤和贵州烟煤三种煤为原料,以油溶性环烷酸钼为催化剂,分别与马瑞常渣(MRAR)、克炼常渣(KAR)以及催化裂化油浆(FCCS)在高压釜内模拟悬浮床加氢共炼反应。结果表明,不同的油体系下,两种褐煤都能达到83%以上的转化率,而对于贵州烟煤,转化率最高的FCCS体系与最低的KAR体系分别为67.75%和50.31%,相差很大。采用FT-IR和SEM分析反应后固体残渣,计算了固体残渣中脂肪族和芳香族中各个基团的相对含量,并对比了不同体系反应后固体残渣的微观形貌。结果表明,KAR体系的固体残渣脂肪链较长,支链化程度高,取代度较低。转化率较高的褐煤反应后固体残渣结构松散,分散度高;转化率较低的烟煤固体残渣随着转化率降低,残渣颗粒逐渐变大,表面更加光滑,板结程度加深。

Analysis of solid residues from the co-processing of different rank coals and oils

Anhui lignite, Liaoning lignite and Guizhou bitumite were co-processed with Murray residue (MRAR), Karamay residue (KAR) and FCC slurry (FCCS) in an autoclave with molybdenum naphthenate as catalyst, simulating the slurry-phase hydrogenation co-processing. The results show that for two lignites under different oil systems, the conversion of coal exceeds 83%. However, for Guizhou bitumite, a great difference is observed in the coal conversion between FCCS (67.75%) and KAR (50.31%) for co-processing. The solid residues after co-processing were analyzed by FT-IR and SEM, to determine the relative content of aliphatic and aromatic groups and the micro morphology. It is found that the solid residue derived from the KAR system possesses a low content of CH₂/CH₃ and a low substitution degree. Moreover, the solid residues obtained from two lignites with high coal conversion exhibit a looser structure and a higher dispersion of solid particles than that from bitumite with a low coal conversion.