Five organic solvents, N-methyl-2-pyrrolidone (NMP), cyclohexanone (CYC), N,N-dimethylformamide (DMF), acetonitrile (ACN), and toluene (TOL) were used to treat Shenhua direct coal liquefaction residue (DCLR) by swelling processes. The treated residues were characterized by swelling degree (Q), SEM, FTIR, TG-DTG, and Py-GC/MS methods. The effect of swelling treatment on the swelling properties, surface morphology, functional group distribution, and pyrolysis performance of the residues was investigated. Swelling results showed that the swelling effect with different solvents on each residue was different and that the swelling degree of the residue treated by NMP was high, 2.4. Swelling treatment could significantly change the surface morphology and pore structure of DCLR, resulting in the increase of pores in the residue. FTIR spectra proposed that swelling treatment could effectively break the hydrogen bonds in residue and change the abundance of oxygen-containing functional groups. TG-DTG profiles demonstrated that the swelling procedure could increase the weight loss and pyrolysis rate of the residue, and the pyrolysis activation energy in high-temperature region (≥360 °C) was obviously reduced, while the energy in the low-temperature region (120–360 °C) was increased. Py-GC/MS proposed that the swelling pretreatment could change the pyrolysis product distribution of the residue, with the species of the products decreased, and that ketones and arenes compounds were the main products.

中文翻译：

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有机溶剂溶胀处理对煤直接液化残渣结构和热解性能的影响

N-甲基-2-吡咯烷酮（NMP），环己酮（CYC），N，N-二甲基甲酰胺（DMF），乙腈（ACN）和甲苯（TOL）五种有机溶剂用于处理神华直接煤液化残渣（DCLR） ）。处理后的残留物的特征在于溶胀度（Q），SEM，FTIR，TG-DTG和Py-GC / MS方法。研究了溶胀处理对残留物溶胀性能，表面形态，官能团分布和热解性能的影响。溶胀结果表明，不同溶剂对每种残留物的溶胀效果不同，NMP处理的残留物溶胀度高，为2.4。溶胀处理可显着改变DCLR的表面形态和孔结构，从而导致残留物中孔的增加。FTIR光谱表明溶胀处理可以有效地破坏残基中的氢键并改变含氧官能团的丰度。TG-DTG曲线表明，溶胀过程可增加残留物的重量损失和热解速率，高温区（≥360°C）的热解活化能明显降低，而低温区（120-360°C）的热解活化能明显增加。Py-GC / MS提出溶胀预处理可以改变残留物的热解产物分布，产物种类减少，而酮类和芳烃类化合物是主要产物。