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    A PROCESS FOR THE PRODUCTION OF A SUPERABSORBENT POLYMER
    3.
    发明公开
    A PROCESS FOR THE PRODUCTION OF A SUPERABSORBENT POLYMER 有权
    用于生产超吸收聚合物

    公开(公告)号：EP2552976A1

    公开(公告)日：2013-02-06

    申请号：EP11705891.7

    申请日：2011-03-01

    申请人： Evonik Degussa GmbH

    发明人： GARTNER, Herbert ,  HARREN, Jörg ,  HAGER, Marc ,  PLÖCHINGER, Harald ,  FRICKER, Daniel ,  KOHLER, Hans-Peter ,  AUERNIG, Sabine

    IPC分类号： C08F220/06 ,  C08F2/44 ,  A61L15/60 ,  C08K13/02 ,  C08K5/17 ,  C08F2/10

    CPC分类号： C08F2/10 ,  C08F4/40 ,  C08F220/06 ,  C08K5/092 ,  C08K5/175

    摘要： The present invention relates to a continuous or batch process for the preparation of a super-absorbent polymer comprising: a) subjecting an aqueous monomer mixture containing - at least one ±,²-ethylenically unsaturated monomer; - at least one monomer bearing at least two ±,²-ethylenically unsaturated groups; - iron ions in an amount of 0.1 to 3 wppm based on the total weight of the aqueous monomer mixture; and - at least one chelating agent in an amount to provide a mol ratio of chelating agent to iron ion of 0.8 to 4.0 to free radical polymerization in an reactor to obtain a super-absorbent polymer; and b) recovering the super-absorbent polymer, whereby if the process is continuous and is run in an agitated reactor the upper limit of the mol ratio of chelating agent to iron ion is - 4.0 for a throughput of total reaction mixture through the reactor of at most 1.3 kg/h per liter reactor volume, - 3.5 for a throughput of total reaction mixture through the reactor of more than 1.3 kg/h per liter reactor volume at most 2.5 kg/h per liter reactor volume, and - 1.5 for a throughput of total reaction mixture through the reactor of more than 2.5 kg/h per liter reactor volume.