A comparative study of the characteristics and carbonization behaviors of three modified coal tar pitches
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摘要: 实验制备了三种改性煤沥青,分别是：用苯丙烯醛（CMA）改性的沥青，用对甲苯磺酸（PTS）改性的沥青，以及用上述这两种物质混合改性的沥青。通过红外光谱及热分析对原料沥青及改性沥青进行了表征。对这四种沥青在不同温度下进行炭化，并对其炭化产物进行红外光谱和偏光表征。结果表明，通过改性，煤沥青的性能和炭化行为发生较大变化。在这四种沥青中，用CMA和PTS混合物改性的沥青，炭化产率高于仅用其中一种物质改性的沥青的炭化产率。另外，100 g煤沥青用7 g PTS和10 mL CMA的混合物改性的产物在800 oC的炭化产率比原料沥青增加5.08%。并且在相同条件下，与其他三种沥青相比，其能够得到更多的中间相碳微球。红外光谱结果表明，在改性沥青热解过程中，CMA在300℃以下挥发，并且甲基和亚甲基随着温度的升高逐渐消失。Abstract: Coal tar pitch (CTP) was modified either with 10g cinnamaldehyde (CMA) per 100 g CTP, 7 g p-toluene sulfonic acid (PTS) per 100g CTP, or a mixture of 10g CMA and 7 g PTS per 100g CTP. The parent CTP and the modified CTPs were characterized by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis. The four samples were carbonized at different temperatures and the products were characterized by FT-IR and polarized-light microscopy. Results show that the modifications have a large influence on the characteristics and carbonization behavior of the CTP. The distillation of CMA occurs at a temperature lower than 300 ℃ during the carbonization of the CMA-modified CTP. Methyl and methylene groups of the parent CTP and the modified CTPs gradually disappear with increasing temperature during carbonization. The modification of the CTP with the mixture of CME and PTS results in a highest increase (5.08%) of carbonization yield and the most abundant mesophase sphere formation during carbonization
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Key words:
- Coal tar pitch /
- Cinnamaldehyde /
- p-toluene sulfonic acid /
- Carbonization
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