7.
    发明专利
    未知

    公开(公告)号:DE1142597B

    公开(公告)日:1963-01-24

    申请号:DEB0063356

    申请日:1961-07-21

    Applicant: BASF AG

    Abstract: Dry neutral alkali metal benzenecarboxylates, which may be thermally converted into other alkali metal benzenecarboxylates, are recovered from their aqueous solutions by adjusting the latter to a pH 0.05-0.9 unit above the point of equivalence by addition of alkali metal hydroxide and dividing the solutions thus obtained into two streams, of which one is led into a conventional evaporator and the other is sprayed into a wash tower through which a CO2-containing gas passes in countercurrent. The sodium and potassium salts of benzoic, phthalic and isophthalic acids are specifically mentioned as recoverable salts. Specification 840,040 and U.S.A. Specification 2,930,813 are referred to.

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