Process for treating high ph furnace carbon black
    37.
    发明授权
    Process for treating high ph furnace carbon black 失效
    高炉煤炭炭黑处理工艺

    公开(公告)号:US2682448A

    公开(公告)日:1954-06-29

    申请号:US6767448

    申请日:1948-12-28

    Inventor: CINES MARTIN R

    CPC classification number: C09C1/565 C01P2006/12 C01P2006/19

    Abstract: The pH of furnace black is reduced from above 7 to a value between 2.9 and 7 by intimately contacting with a current of oxygen-containing gas at a temperature below 1,200 DEG F. The treatment also results in an increased hardness of pellets made from the black and in an increased scorch time of rubber compositions containing the black (see Group V). Treatment may be effected with a gas containing 2.5 to 10 per cent by volume of oxygen, preferably at a temperature of 650-1000 DEG F. or with ozonised air at 80-100 DEG F. Used gas may be mixed with the required amount of air and recycled. Pelleting of the black in a tumbling drum may be carried out before, during, or after the oxidising treatment.

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