| 摘要 |
PURPOSE:To produce the titled substance without causing coking troubles, by thermally cracking a heavy oil successively with an externally heated tubular reactor and a continuous completely mixing tank reactor, separating the cracked products, carrying out the thermal cracking of the heavy oil component, adding a naphthenic heavy oil to the produced tar, and recycling the mixture to the system. CONSTITUTION:Stock heavy oil is supplied to the externally heated tubular reactor 2 through the line 1 to effect the thermal cracking. The cracked product is further thermally cracked with the reactors 3-5 consisting of two or more continuous completely mixing tank reactors connected in series, to produce cracked oil and pitch. Each reactor 3-5 is supplied with hot gas or vapor as a heating medium from the pipe 6, and the temperature of the reactors are adjusted higher toward the latter stage. The produced pitch is taken out from the line 36, and cooled and solidified by the flaker 14. The cracked oil is separated into heavy oil and light oil by the distillation column 8, and the heavy oil component is further subjected to the thermal cracking in the cracking furnace 10 to produce light oil and aromatic tar. Naphthenic heavy oil is added continuously from the line 40 to the tar, and the mixed tar is recycled to the reactors 4, 5 via the lines 30, 31.
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