Abstract In this work, coal tar pitch was co-carbonized with biomass tar pitch to manufacture hybrid mesophase pitch as precursor for the preparation of needle coke. The properties of mesophase pitches were characterized using a polarized light optical microscope, apparent viscometer, FT-IR, and 1H NMR. After adding biomass tar pitch into coal tar pitch, the mesophase pitches had more flow domain-like texture due to its lower viscosity and softening points. Besides, the addition of biomass tar pitch altered the chemical structure and functional groups of the resulting mesophase pitch, accompanied by the growth of alkyl and naphthenic compounds. Accordingly, the needle coke prepared from the hybrid mesophase pitches showed more flow domain textures and were better aligned uniaxially than the counterpart derived from pure coal tar pitch. The coefficient of thermal expansion of needle coke was reduced from 0.93 × 10−6 °C-1 to 0.42 × 10−6 °C-1. The low viscosity of the mesophase pitches caused by the addition of biomass tar pitch favored the development of mesophase and highly uniaxial arrangement. The increase in the alkyl and naphthenic group compounds greatly improved the performance of the needle coke.

中文翻译：

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混合煤焦油和生物质焦油沥青中间相和针状焦的特性

摘要 在这项工作中，煤焦油沥青与生物质焦油沥青共炭化制备混合中间相沥青作为制备针状焦的前驱体。使用偏光光学显微镜、表观粘度计、FT-IR 和 1H NMR 表征中间相沥青的性质。在煤焦油沥青中加入生物质焦油沥青后，由于其较低的粘度和软化点，中间相沥青具有更多的流域状结构。此外，生物质焦油沥青的添加改变了所得中间相沥青的化学结构和官能团，伴随着烷基和环烷化合物的生长。因此，由混合中间相沥青制备的针状焦比由纯煤焦油沥青制备的针状焦显示出更多的流域结构并且单轴排列更好。针状焦的热膨胀系数从 0.93 × 10−6 °C-1 降低到 0.42 × 10−6 °C-1。由添加生物质焦油沥青引起的中间相沥青的低粘度有利于中间相和高度单轴排列的发展。烷基和环烷基化合物的增加大大提高了针状焦的性能。