3.
    发明专利
    未知

    公开(公告)号:DK136160C

    公开(公告)日:1978-01-23

    申请号:DK617873

    申请日:1973-11-15

    Applicant: HOECHST AG

    Abstract: A continuous process for preparing copper phthalocyanines by caking a mixture of phthalodinitrile, and a copper salt which comprises carrying out the reaction in a continuously working, heatable, tubular vibration mill, which contains iron or steel bars in the grinding room.

    PROCESS FOR THE PREPARATION OF 4-CHLORO-NAPHTHALIC ACID ANHYDRIDE

    公开(公告)号:IN139701B

    公开(公告)日:1976-07-17

    申请号:IN19CA1973

    申请日:1973-08-28

    Applicant: HOECHST AG

    Inventor: DEUCKER W TROSTER H

    Abstract: 1439994 Preparation of 4-chloronaphthalic acid, its anhydride, salts and derivatives HOECHST AG 30 Aug 1973 [30 Aug 1972] 40793/73 Heading C2C The invention comprises a process for the preparation of 4-chloronaphthalic acid, its anhydride, salts and derivatives which comprises chlorinating naphthalic acid or an anhydride, salt or derivative thereof in a solution containing alkali metal, hydroxide or carbonate and having a pH of 6.8-9.0 and then, if necessary, converting the obtained 4-chloroproduct to the required acid, salt, anhydride or derivative by a method known per se. The chlorination may be carried out using Cl 2 or hypochlorite and the exemplified product is 4-chloronaphthalic anhydride.

    6.
    发明专利
    未知

    公开(公告)号:BR7400335D0

    公开(公告)日:1974-08-22

    申请号:BR33574

    申请日:1974-01-17

    Applicant: HOECHST AG

    Inventor: DEUCKER W TROSTER H

    Abstract: A process for the preparation of 4-bromo-naphthalic acid anhydride by bromination of an alkali metal salt of naphthalic acid in an aqueous medium at a pH of 6.8 to 9 by dropwise adding 0.55 to 0.65 mol of bromine per mol of naphthalic acid and oxidizing the bromine at the same pH-value with chlorine. By this process 4-bromo-naphthalic acid anhydride can be obtained in a quantitative yield whereby the formation of 4-chloro-naphthalic acid is avoided.

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