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    31.
    发明专利
    未知

    公开(公告)号：BR9404216A

    公开(公告)日：1995-10-17

    申请号：BR9404216

    申请日：1994-10-24

    Applicant: HOECHST AG

    Inventor： ARNDT OTTO DR ,  SCHUBERT HANS DR

    IPC: B01J27/128 ,  C07B61/00 ,  C07C46/00 ,  C07C46/06 ,  C07C46/10 ,  C07C50/24 ,  C10M131/10 ,  C07C50/04 ,  C07C45/00

    Abstract: A process for the preparation of tetrachloro-1,4-benzoquinone of high purity by the action of chlorine and concentrated hydrochloric acid on hydroquinone, by introducing a part of the hydroquinone to be employed into an initially introduced 4- to 6-fold molar amount-based on the total amount of hydroquinone-of 20 to 37 % aqueous hydrochloric acid containing catalytic amounts of iron(III) ions and an anionic dispersant, introducing 1.5 to 2.0 times the molar amount-based on total hydroquinone-of chlorine as a gas into this solution at a temperature of 20 DEG to 90 DEG C., then adding the residual amount of hydroquinone as a solid or in dissolved form, introducing 1.5 to 2.0 times the molar amount of chlorine as a gas, keeping the concentration of the hydrochloric acid here at 23-25% by addition of water and finally raising the temperature to 100 DEG to 107 DEG C. with further introduction of chlorine as a gas (1.7 to 2.5 times the molar amount) and dilution with water to a hydrochloric acid concentration of 20 to 22%.

    33.
    发明专利
    未知

    公开(公告)号：DE3924177A1

    公开(公告)日：1991-01-24

    申请号：DE3924177

    申请日：1989-07-21

    Applicant: HOECHST AG

    Inventor： SCHUBERT HANS DR ,  PAPENFUHS THEODOR DR ,  ARNDT OTTO DR

    IPC: C07C37/62 ,  C07C46/06

    Abstract: The invention concerns a method for the preparation of chloranil by chlorinating 1 mole of hydroquinone with 4 to about 8 moles of chlorine gas in about 15 to about 37 % by wt. hydrochloric acid at temperatures between about 10 DEG C and the boiling point of the reaction mixture to form tetrachlorohydroquinone, and by oxidizing the tetrachlorohydroquinone by passing a mixture of gaseous elementary chlorine and air or oxygen through the reaction mixture thus obtained at temperatures of about 80 DEG C to the boiling point of the reaction mixture.

    36.
    发明专利
    未知

    公开(公告)号：DE3535482A1

    公开(公告)日：1987-04-09

    申请号：DE3535482

    申请日：1985-10-04

    Applicant: HOECHST AG

    Inventor： ARNDT OTTO DR ,  PAPENFUHS THEODOR DR

    IPC: C07D209/92

    Abstract: Process for the preparation of naphthostyril by dissolving 1,8-naphthalimide in an aqueous solution of lithium hydroxide and potassium hydroxide while heating at 40 DEG C. to 80 DEG C., cooling the solution obtained to 14 DEG C. and seeding it at said temperature with a maximum of 1 mol-% of sodium 1,8-naphthalimide per 1 mol of 1,8-naphthalimide used, then adding chlorine bleaching liquor at 10 DEG C. to 20 DEG C., reductively removing excess active chlorine after the reaction has taken place, adjusting the alkaline aqueous solution produced of the alkali-metal salt of the 1-aminonaphthal-ene-8-carboxylic acid formed to a pH of 2.0 by adding acid and isolating the naphthostyril which precipitates in this process.

    PROCESS FOR PREPARING 2,6-DICHLORO-4-NITRO-ANILINE
    37.
    发明专利
    PROCESS FOR PREPARING 2,6-DICHLORO-4-NITRO-ANILINE 未知

    公开(公告)号：DE3560069D1

    公开(公告)日：1987-03-12

    申请号：DE3560069

    申请日：1985-05-11

    Applicant: HOECHST AG

    Inventor： ARNDT OTTO DR ,  PAPENFUHS THEODOR DR

    IPC: C07C209/74 ,  C07C67/00 ,  C07C209/00 ,  C07C211/52 ,  C07C87/60 ,  C07C85/24

    Abstract: Process for the preparation of 2,6-dichloro-4-nitroaniline by chlorination of 4-nitroaniline with chlorine bleaching liquor in water using acids, which comprises chlorinating 1 mole of 4-nitroaniline in 3-6 moles of hydrochloric acid (HCl) or nitric acid (HNO3) in the form of a dilute, aqueous acid in the presence of a dispersing agent which is stable under the reaction conditions, the chlorination initially being carried out at 5 DEG to 10 DEG C. and then at 15 DEG -20 DEG C. and, finally, after 90-95% of the 2-chloro-4-nitroaniline intermediately formed has been converted into 2,6-dichloro-4-nitroaniline, the temperature of the aqueous suspension being increased from 15 DEG -20 DEG C. to 70 DEG C., without further addition of chlorine bleaching liquor, and then by post-chlorinating, by renewed addition of chlorine bleaching liquor, at temperatures between 20 DEG and 70 DEG C., bringing the pH of the aqueous suspension to 9.0 and filtering off the 2,6-dichloro-4-nitroaniline formed and washing it with dilute mineral acid.

    Optionally ring-substituted benzene- and naphthalenesulphonyl- ethane- beta -sulphonic acid salts and process for their preparation
    38.
    发明专利
    Optionally ring-substituted benzene- and naphthalenesulphonyl- ethane- beta -sulphonic acid salts and process for their preparation 未知

    公开(公告)号：DE3422671A1

    公开(公告)日：1985-12-19

    申请号：DE3422671

    申请日：1984-06-19

    Applicant: HOECHST AG

    Inventor： ARNDT OTTO DR ,  PAPENFUHS THEODOR DR

    IPC: C07C317/14 ,  C07C147/06

    Abstract: A process for the preparation of benzene- and naphthalenesulphonyl- ethane- beta -sulphonic acid salts of the general formula (1> R-SO2-CH2-CH2-SO3Z(1> in which R denotes a phenyl or naphthyl group which can be substituted by fluorine, chlorine or bromine atoms, or hydroxyl, amino, alkyl-C1-C6, alkoxy-C1-C6, trifluoromethyl, carboxamide, -NH-alkyl-C1-C6, -N-(alkyl-C1-C6)2, -SO2-NH2, -SO2- NH(alkyl-C1-C6) or -SO2N(alkyl-C1-C6)2 groups, and Z represents an alkali metal or alkaline earth metal atom or the ammonium group, preferably a sodium atom, by reacting an optionally ring-substituted benzene- or naphthalenesulphonylethanol of the general formula (2> R-SO2-CH2-CH2-OH(2), in which R has the abovementioned meaning, with a mixture of ammonium hydrogen sulphite and ammonia in water at temperatures from about 140 DEG C to about 180 DEG C.

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