催化裂化油浆富芳烃组分热转化制备中间相沥青的研究

PREPARATION OF MESOPHASE PITCH BY THERMAL CONVERSION OF AROMATICS-RICH COMPONENTS IN FCC SLURRY

利用催化裂化油浆富芳烃组分(FCC-KQ)制备中间相沥青,探究反应温度、反应时间和反应压力对热缩聚残余物软化点和收率的影响。通过光学显微镜、热重分析、核磁共振氢谱等研究反应温度、反应时间和反应压力对FCC-KQ热转化行为的影响,提出中间相沥青的形成机理。结果表明:在低温或短反应时间下,热缩聚残余物软化点升高缓慢而收率减小迅速;在高温或长反应时间下,热缩聚残余物软化点升高较快而收率减小缓慢;加压使热缩聚残余物软化点降低,收率增大;中间相小球的生长和融并是快速过程,此过程中热缩聚残余物的软化点迅速升高。由FCC-KQ在390℃、2 MPa下反应8 h制得软化点为121℃的各向异性中间相沥青C120,其性能与美国A240沥青相似,同时具备更高的残炭和更低的杂原子含量。

The effects of reaction temperature,reaction time and reaction pressure on the thermal conversion behavior of FCC-KQ(aromatics-rich components of FCC slurry)were investigated by means of optical microscopy,softening point,yield and thermogravimetric analysis,and the formation mechanism of mesophase pitch was proposed.The results indicated that the softening point increased slowly and the yield decreased rapidly at low temperatures or a short reaction time,while the softening point increased rapidly and the yield decreased slowly at high temperatures or a long reaction time.The growth and melting of meso phase spheres was a rapid process,in which the softening point of thermal polycondensation residues increased rapidly.The anisotropic mesophase pitch C120 with a softening point of 121℃was produced from FCC-KQ at 390℃and 2 MPa for 8 h.The properties of C120 pitch were similar to those of A240 pitch,with higher carbon residues and lower heteroatom content.