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    SULPHURIC ACID SEMIESTERS OF ORGANIC DYESTUFFS
    3.
    发明专利
    SULPHURIC ACID SEMIESTERS OF ORGANIC DYESTUFFS 未知

    公开(公告)号：AU508771B2

    公开(公告)日：1980-04-03

    申请号：AU2754577

    申请日：1977-08-02

    Applicant: HOECHST AG

    Inventor： HOYER E ,  STEUERNAGEL H H ,  WAGNER D

    IPC: C09B43/24 ,  C09B62/503 ,  C09B29/28 ,  C09B29/12 ,  C09B31/02 ,  C09B1/02 ,  C09B45/18 ,  C09B47/04

    Abstract: Improved process for the sulfatation of the hydroxy group of a beta -hydroxy-ethylsulfonyl group present in compounds selected from the dyestuff class which comprises carrying out the reaction in a machine operating with a kneading action and effect and with the use of only 1 to 5 times the equimolar amount of a concentrated sulfuric acid, of oleum or sulfur dioxide itself. The beta -sulfatoethylsulfonyl group containing dyestuffs, thus prepared have a high purity and are obtained in a high yield and esterification rate. Above all, the novel process is distinguished by a highly reduced salt and acid content of the waste water.

    SULPHURIC ACID SEMIESTER COMPOUNDS
    6.
    发明专利
    SULPHURIC ACID SEMIESTER COMPOUNDS 未知

    公开(公告)号：AU512427B2

    公开(公告)日：1980-10-09

    申请号：AU2755077

    申请日：1977-08-02

    Applicant: HOECHST AG

    Inventor： STEUERNAGEL H H ,  HOYER E ,  MEININGER F

    IPC: C07D231/24 ,  C07D231/26 ,  C07D231/46 ,  C09B62/507 ,  C09B29/24 ,  C09B31/08 ,  C09B45/16 ,  C09B45/18 ,  C09B45/22 ,  C09B45/26 ,  C09B45/28 ,  C07C141/02

    Abstract: An improved and novel process had been found for the esterification of aminophenol, amino-benzanilide and pyrazolone compounds containing a beta -hydroxyethylsulfonyl group, by means of sulfuric acid or sulfur trioxide which improvement is characterized by that the esterification is performed in a machine which is operating with a kneading action and effect, using per mol beta -hydroxyethylsulfonyl compound 1 to 2.5 times the equivalent molar amount of concentrated sulfuric acid, oleum or sulfur trioxide. This novel process has the great advantage that great amounts of sulfuric acid are saved which could charge the waste water, also in form of sodium sulfate formed after the required neutralization. Furthermore, the beta -sulfatoethylsulfonyl compounds formed as end-products in the esterification process are prepared by this novel process in higher yields, in a higher degree of esterification rate and in a higher purity. They are obtained in form of a powder or plastic mass from the kneading machine, which is well transportable and storable, and can advantageously used in the form of this consistency, without intermediate isolation of the pure beta -sulfato compound itself, directly for the preparation of azo dyestuffs which are poor of inert salts, possess a high tinctorial strength and purity.

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