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    21.
    发明专利
    未知

    公开(公告)号：DK248275A

    公开(公告)日：1975-12-05

    申请号：DK248275

    申请日：1975-06-03

    Applicant: HOECHST AG

    Inventor： BACHMANN W ,  GNABS C ,  JANECKA K ,  MUNDLOS E ,  PAPENFUHS T ,  WAESE G

    IPC: C07C65/11 ,  C07C51/00 ,  C07C51/43 ,  C07C67/00 ,  C07C

    Abstract: An improved process for isolating 2-hydroxynaphthalenecarboxylic acids from reaction mixtures of the alkali metal salts of the 2-hydroxynaphthalene with carbon dioxide had been found which comprises diluting with water the reaction mixture which contains the di-alkali metal salt of 2-hydroxynaphthalenecarboxylic acid and 2-hydroxynaphthalene, while keeping the mixture at a temperature of at least 80 DEG C, then adjusting the pH-value to about 6 to 7 by means of aqueous mineral acid, separating the lower phase at at least 80 DEG C, cooling the upper phase to about 15 DEG to 25 DEG C, separating the 2-hydroxynaphthalene, then adjusting the pH-value to about 1 to 2 by means of aqueous mineral acid and isolating the separated 2-hydroxynaphthalenecarboxylic acid. By this novel process, work intensive operations, expensive technical apparatuses which are suspectible to repairs, solvents which do not participate directly in the reaction and therewith complicated regenerations, as known from the present art, are completely avoided. It permits clear and very easy separation of the reaction products at only one and the same stage in the process and allows in advantageous manner continuous operation.

    24.
    发明专利
    未知

    公开(公告)号：DK55174A

    公开(公告)日：1975-02-03

    申请号：DK55174

    申请日：1974-02-01

    Applicant: HOECHST AG

    Inventor： PAPENFUHS T

    IPC: C09B55/00

    30.
    发明专利
    未知

    公开(公告)号：BR7602069A

    公开(公告)日：1976-10-05

    申请号：BR7602069

    申请日：1976-04-06

    Applicant: HOECHST AG

    Inventor： PAPENFUHS T ,  VOLK H

    IPC: C08K5/00 ,  C09B55/00 ,  D06P1/13

    Abstract: New water-insoluble compounds have been found of the formula (I), wherein n is 1, 2 or 3, each R, different or the same, is halogen, lower alkyl, lower alkoxy, phenoxy, phenoxy substituted by halogen, lower alkyl or lower alkoxy, or is hydroxy, cyano, trifluoromethyl, carboxy, lower carbalkoxy or lower alkanoyl or benzoyl or benzoyl substituted by halogen, lower alkyl or lower alkoxy, and Z is hydrogen, halogen, lower alkoxy, nitro or cyano, which are well suitable as pigments for dyeing polymer masses, lacquers, caoutchouc, synthetic leather or spin-dyeing viscose or cellulose acetate, for paper and printing pastes. The dyeings obtained with them are excellently fast to light, weather and organic solvents and to the action of heat and are distinguished by a high tinctorial strength, good transparency and very clear shades.

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