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    • 8. 发明公开
    • Tar and/or oil pitch with a low content of polycyclic aromatic substances and a method for the preparation thereof
    • Teer- und / oderÖlpechmit geringem Gehalt a polycyclischen aromatischen Stoffen und dessen Herstellung
    • EP0957150A1
    • 1999-11-17
    • EP98830298.0
    • 1998-05-15
    • Carbochimica S.p.A.
    • Caranti, MartinoChiettini, Remo
    • C10C1/04C10C3/06
    • C10C3/06C10C1/04
    • A tar and/or oil pitch has a low content of polycyclic aromatic substances and is characterized in that it has a benzo[a]pyrene content less than or equal to 5 ppm, and in that it has optical anisotropy of less than 1%; it is prepared by means of a method in which a residue with a low softening point from the primary distillation of tar and/or petroleum or a mixture of the residue with tar and/or petroleum is distilled with continuous mixing in an evaporator having a heat-exchange area:volume ratio of between 1 m 2 /m 3 and 200 m 2 /m 3 , at a pressure less than or equal to 10 mbars, and at a temperature of between 250°C and 360°C, for a period of at least 20 minutes; the pitch according to the invention is particularly suitable for use as a binding agent in the production of electrodes, refractory materials or special graphitized materials, as an impregnating agent, and as a raw material for the production of paints, pitch coke and rechargeable batteries.
    • 焦油和/或油沥青具有低含量的多环芳族物质,其特征在于其苯并芘含量小于或等于5ppm,并且其光学各向异性小于1%; 通过以下方法制备:将来自焦油和/或石油的一次蒸馏的低软化点的残余物或残余物与焦油和/或石油的混合物在具有热量的蒸发器中连续混合的方法蒸馏 - 交换面积:体积比在1m 2 / m 3和200m 2 / m 3之间,压力小于或等于10mbars,在250℃ 和360℃,持续至少20分钟; 根据本发明的沥青特别适合用作生产电极,耐火材料或特殊石墨化材料作为浸渍剂的粘合剂,以及用作生产油漆,沥青焦炭和可充电电池的原料。