以经过闪蒸净化除去一次QI的煤焦油为原料,在常压下220 ℃～400 ℃范围内通过空气氧化制备一定软化点范围的沥青.考察了反应温度、空气氧化时间、空气流量对沥青性质和结构的影响.结果表明空气氧化可有效提高煤焦油软化点、分子量和制取完全各向同性沥青.将氧化沥青进一步在400 ℃,N2保护下停留60 mim进行常压热缩聚后,所得产物在热台显微镜室温～600 ℃下观察发现在各向同性基质中有中间相小球产生,且随着煤焦油氧化程度加深,所得沥青在后续热解过程中生成的中间相熔并尺寸减小.表明空气吹扫氧化虽可促进脱氢缩合反应进行,但对中间相发展有抑制作用.因此,可通过控制煤焦油的氧化程度制取不同中间相含量及组织结构的沥青.
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