Polymerisation inhibitor mixture containing p-phenylene diamine

    公开(公告)号:DE19735223A1

    公开(公告)日:1999-02-18

    申请号:DE19735223

    申请日:1997-08-15

    Applicant: BASF AG

    Abstract: A process for the stabilisation of esters of (meth)acrylic acid as a pure substance or as a component within a mixture that does not contain a Bronsted acid having a Bronsted acid strength greater than that of acrylic acid is claimed by addition of a p-phenylene diamine containing polymerisation inhibitor as a pure substance or mixture of inhibitors that contains (A) a nitroxyl radical and/or an organic compound containing a nitroso group and (B) a p-phenylene diamine.

    36.
    发明专利
    未知

    公开(公告)号:DE59600212D1

    公开(公告)日:1998-07-02

    申请号:DE59600212

    申请日:1996-01-13

    Applicant: BASF AG

    Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. contg. (I) as main prod. and lower aldehydes as by-prods. by rectification in a column with a distn. zone and a concn. zone, the mixt. is not supplied to the column directly. Instead, it is passed to a heated dwell vessel connected to the concn. zone, in which the mixt. is kept boiling, and the sump liquid from this vessel is fed to the column.

Patent Agency Ranking