21.
    发明专利
    未知

    公开(公告)号:AT442350T

    公开(公告)日:2009-09-15

    申请号:AT03789263

    申请日:2003-12-13

    Applicant: BASF SE

    Abstract: The present invention relates to a process for preparing isocyanates by reaction of amines with phosgene in a reactor and subsequent separation of the isocyanate from the reaction mixture leaving the reactor and purification of the isocyanate, wherein the separation and purification of the isocyanate is carried out in a column having a pressure at the top of 1-950 mbar, preferably 5-50 mbar, particularly preferably 10-20 mbar, and a temperature at the bottom of 90-250° C., preferably 120-170° C., particularly preferably 130-150° C., and the pure isocyanate stream is preferably taken off in liquid or gaseous form at a side offtake of the column.

    25.
    发明专利
    未知

    公开(公告)号:AT520646T

    公开(公告)日:2011-09-15

    申请号:AT07726640

    申请日:2007-03-06

    Applicant: BASF SE

    Abstract: A process is proposed for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating toluene with nitrating acid, which comprises basifying the process wastewater to a pH of >8.5, feeding it to a stripping column in the upper region thereof and stripping it with steam in countercurrent to obtain a vapor stream laden with dinitrotoluene and a bottom stream depleted in dinitrotoluene compared to the process wastewater used.

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