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22 records (took 0.047 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE2923930A1

    公开(公告)日：1980-01-03

    申请号：DE2923930

    申请日：1979-06-13

    Applicant: SUGAI CHEMICAL IND CO LTD

    Inventor： FUJII HIRONORY ,  NAGASHIMA THUYOSHI ,  SHIBAMOTO NOBUYORI

    IPC: C07C309/35 ,  C07C67/00 ,  C07C301/00 ,  C07C143/30 ,  C07C139/14

    Abstract: A process for separating 1,6-naphthalenedisulfonic acid, 2,6-naphthalenedisulfonic acid or 2,7-naphthalenedisulfonic acid selectively from reaction mixtures obtained by disulfonation of naphthalene under different reaction conditions is disclosed. For example, a particular disulfonation reaction of naphthalene is carried out which favors the formation of a particular isomer. This reaction mixture is diluted with water to adjust the sulfuric acid concentration to 35 to 90% by weight and the temperature is maintained at 0 DEG to 80 DEG C.; 1,6-naphthalene-disulfonic acid is selectively separated at high purity.

    PRODUCTION OF 2,4-DICHLORO-3-ETHYL-6-NITROPHENOL
    2.
    发明专利
    PRODUCTION OF 2,4-DICHLORO-3-ETHYL-6-NITROPHENOL 失效

    公开(公告)号：JPH09169705A

    公开(公告)日：1997-06-30

    申请号：JP34919795

    申请日：1995-12-19

    Applicant: SUGAI CHEMICAL IND CO LTD

    Inventor： SHIBAMOTO NOBUYORI ,  TACHIBANA SATOSHI

    IPC: C07C201/10 ,  C07C205/26 ,  C07C303/22 ,  C07C309/42

    Abstract: PROBLEM TO BE SOLVED: To simply obtain the subject compound useful as the intermediate of a cyanide coupler for color photography in high purity. SOLUTION: This method for producing the 2,4-dichloro-3-ethyl-6-nitrophenol of formula I comprises sulfonating 4-chloro-3-ethylphenol of formula II with fuming sulfate (28-65% concentration) in an organic solvent (e.g. methylene chloride) preferably at 10-50 deg.C chlorinating the produced 5-chloro-4-ethyl-2- hydroxybenzene-sulfonic acid with chlorine gas in an aqueous solvent, converting the produced 3,5-dichloro-4-ethyl-2-hydroxybenzenesulfonic acid into a sulfonic acid, depositing the sulfonic acid, and further nitrating the sulfonic acid with nitric acid or a nitrate.

    METHOD FOR SEPARATING AND PURIFYING NITROGEN-CONTAINING AROMATIC RING COMPOUND
    6.
    发明专利
    METHOD FOR SEPARATING AND PURIFYING NITROGEN-CONTAINING AROMATIC RING COMPOUND 失效

    公开(公告)号：JP2001354654A

    公开(公告)日：2001-12-25

    申请号：JP2000178243

    申请日：2000-06-14

    Applicant: SUGAI CHEMICAL IND CO LTD

    Inventor： YAMASHITA TAKAHARU ,  SHIBAMOTO NOBUYORI ,  YAMABE MASARU

    IPC: C07D215/06 ,  C07D213/30 ,  C07D213/61 ,  C07D213/68

    Abstract: PROBLEM TO BE SOLVED: To provide a method for separating and purifying a nitrogen-containing aromatic ring compound with a salt of an aromatic sulfonic acid. SOLUTION: This method for separating and purifying the nitrogen-containing aromatic ring compound comprises forming a salt from the nitrogen-containing aromatic ring compound with an aromatic sulfonic acid or its salt in water solvent or a mixed solvent system of the water with an organic solvent under acidic conditions, separating the resultant salt by a difference in solubility or extraction with a solvent, providing the objective aromatic sulfonate of the nitrogen-containing aromatic ring compound, treating the prepared aromatic sulfonate of the nitrogen-containing aromatic ring compound with a basic substance and collecting the objective nitrogen-containing aromatic ring compound. The method has characteristics in that environmental load is smaller than that of a conventional method.

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