5.
    发明专利
    未知

    公开(公告)号:DE102004027022A1

    公开(公告)日:2006-01-05

    申请号:DE102004027022

    申请日:2004-06-02

    Applicant: BASF AG

    Abstract: In a process for distillatively removing ammonia and water from mixtures obtained in the preparation of polyamides which comprise a lactam and/or diamines, and, if appropriate, an aminonitrile and/or dinitrile, and also a cyclopentanone impurity in two stages: 1) the mixture is distilled at from 11 to 35 bar to give, as the top product T1, water, ammonia and cyclopentanone, and, as the bottoms B1, water, the lactam and/or diamines, and, if appropriate, the aminonitrile and/or dinitrile, and 2) T1 is distilled at from 11 to 35 bar to give, as the top product T2, ammonia and cyclopentanone, and, as the bottoms B2, water.

    9.
    发明专利
    未知

    公开(公告)号:DE102004013967A1

    公开(公告)日:2005-10-06

    申请号:DE102004013967

    申请日:2004-03-19

    Applicant: BASF AG

    Abstract: Process for purifying and cooling a gas stream comprising a dialkyl ester A) of an aromatic dicarboxylic acid, which comprises treating the gas stream with an aliphatic dihydroxy compound B) at a temperature less than/equal to the melting point of the dialkyl ester A) in a 1st stage and treating the gas stream with an aliphatic dihydroxy compound B) at above the melting point of the dihydroxy compound B) in at least one 2nd stage.

Patent Agency Ranking