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    Process for the preparation of 2,3,5-trimethy1-p-Benzoquinone
    1.
    发明授权
    Process for the preparation of 2,3,5-trimethy1-p-Benzoquinone 失效
    制备2,3,5-三甲基-1-对苯醌的方法

    公开(公告)号：US6410798B2

    公开(公告)日：2002-06-25

    申请号：US80109201

    申请日：2001-03-08

    Applicant: DEGUSSA

    Inventor： MAASSEN RALF ,  KRILL STEFFEN ,  HUTHMACHER KLAUS

    IPC: C07B61/00 ,  C07C46/08 ,  C07C50/02 ,  C07C45/00 ,  C07C49/105

    CPC classification number: C07C46/08 ,  C07C50/02

    Abstract: A process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidation of 2,3,5- or 2,3,6-trimethylphenol using oxygen or a gas mixture containing oxygen in the presence of a two-phase liquid reaction medium composed of water and a neocarboxylic acid having to 11 carbon atoms with a copper (II) halide-containing catalyst system at elevated temperature.

    Abstract translation: 一种通过在两相存在下使用氧气或含氧气体混合物氧化2,3,5-或2,3,6-三甲基苯酚来制备2,3,5-三甲基对苯醌的方法 由具有11个碳原子的水和具有含卤化铜（II）的催化剂体系的新型羧酸组成的液体反应介质在升高的温度下进行。

    PRODUCTION OF NICOTINIC ACID
    2.
    发明专利
    PRODUCTION OF NICOTINIC ACID 失效

    公开(公告)号：JP2000086634A

    公开(公告)日：2000-03-28

    申请号：JP24351899

    申请日：1999-08-30

    Applicant: DEGUSSA

    Inventor： HEINZ DIETER ,  HOELDERICH WOLFGANG ,  KRILL STEFFEN ,  BOECK WOLFGANG DR ,  HUTHMACHER KLAUS DR

    IPC: C07D213/79 ,  C07D213/80 ,  C07D213/803 ,  C07D213/807

    Abstract: PROBLEM TO BE SOLVED: To provide an improved method for producing nicotinic acid, capable of profitably producing the nicotinic acid in a high yield by the direct oxidation of β-picoline by separately feeding the β-picoline and water into a reactor. SOLUTION: This method for producing nicotinic acid comprises separately feeding β-picoline and water into a reactor filled with a TiO2 support catalyst containing vanadium. This heterogeneous catalyst preferably contains anatase having a specific surface area of >100 m2/g as the support. The anatase support is preferably produced by a sulfate salt method. The titanium dioxide support preferably contains a sulfate salt in an amount of >0.1%. The catalyst preferably has a vanadium dioxide content of 5-50%. The reaction temperature is preferably 150-450 deg.C. The ratio of the acid/starting substance is preferably 5/1 to 40/1. The ratio of the water/starting substance is preferably 15/1 to 100/1. WHSV is preferably 0.02 to 5 h-1.

    METHOD FOR PREPARING alpha-TOCOPHEROL ACETATE
    4.
    发明专利
    METHOD FOR PREPARING alpha-TOCOPHEROL ACETATE 失效

    公开(公告)号：JP2001261669A

    公开(公告)日：2001-09-26

    申请号：JP2001067670

    申请日：2001-03-09

    Applicant: DEGUSSA

    Inventor： KRILL STEFFEN ,  KRETZ STEPHAN ,  HUTHMACHER KLAUS DR

    IPC: C07D311/72 ,  C07D311/04

    Abstract: PROBLEM TO BE SOLVED: To provide an improved method for preparing α-tocopherol ester in a recycling method, wherein the reaction is made to proceed as far as possible in the direction of esterification in the first process, and the catalyst phase obtained in the reaction is regenerated after the finishing treatment by a method capable of readily recycling the catalyst to the reaction without lowering the catalyst activity. SOLUTION: A method for preparing α-tocopherol acetate in a recycling method comprises the following processes: trimethylhydroquinonediester is made to condense with isophytol in a mixture of a polar solvent, which is extractable with water or miscible with water, and water in the presence of a catalyst system containing zinc halide and an aqueous protonic acid, and optionally an elemental metal; and successively, the catalyst system is recycled.

    PRODUCTION OF 2,3,5-TRIMETHYLHYDROQUINONE DIESTER
    8.
    发明专利
    PRODUCTION OF 2,3,5-TRIMETHYLHYDROQUINONE DIESTER 失效

    公开(公告)号：JP2000229909A

    公开(公告)日：2000-08-22

    申请号：JP2000032218

    申请日：2000-02-09

    Applicant: DEGUSSA

    Inventor： KRILL STEFFEN ,  HUTHMACHER KLAUS DR

    IPC: B01J31/26 ,  C07B61/00 ,  C07C67/00 ,  C07C67/08 ,  C07C69/017 ,  C07C69/16

    Abstract: PROBLEM TO BE SOLVED: To easily obtain a 2,3,5-trimethylhydroquinone diester useful as a synthetic intermediate for vitamin E, etc., in high yield by reacting a specific dione with an acylation agent in the presence of a specific easily handleable inexpensive catalyst. SOLUTION: The objective trimethylhydroquinone diester of formula II is produced by reacting 2,6,6-trimethyl-cyclohex-2-ene-1,4-dione of formula I (ketoisophorone or KIP) with an acylation agent in the presence of a catalytic amount of a protonic acid. The reaction is carried out by using an acid catalyst comprising one or more kinds of carboxylic acids (n) selected from orthoboric acid and/or boric anhydride or boric acid triester on one hand and from hydroxycarboxylic acid and a (hydroxy-containing) dicarboxylic acid or tricarboxylic acid on the other hand. The amount of the combined catalyst is preferably 0.1-10 mol%; based on the ketoisophorone used in the reaction.

    REACTION TUBE AND METHOD FOR PRODUCING HYDROGEN CYANIDE
    10.
    发明专利
    REACTION TUBE AND METHOD FOR PRODUCING HYDROGEN CYANIDE 未知

    公开(公告)号：SG11201601072WA

    公开(公告)日：2016-03-30

    申请号：SG11201601072W

    申请日：2014-10-02

    Applicant: EVONIK DEGUSSA GMBH

    Inventor： STEFFAN MARTIN ,  STEURENTHALER MARTIN ,  MÜLLER THOMAS ,  KÖRFER MARTIN ,  KRILL STEFFEN

    IPC: B01J12/00 ,  B01J19/00 ,  B01J19/24 ,  C01C3/02

    Abstract: The reaction tube for preparing hydrogen cyanide comprises a cylindrical tube composed of ceramic, a catalyst comprising platinum applied to the inner wall of the tube and also at least one insert composed of ceramic, having three or four fins pointing from the tube axis to the inner wall of the tube, which is inserted into the cylindrical tube, wherein the fins divide the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean gap between the ends of the fins and the inner wall of the tube is in the range of 0.1 to 3 mm. In the method for preparing hydrogen cyanide, ammonia and at least one aliphatic hydrocarbon having 1 to 4 carbon atoms are reacted in the reaction tube at 1000 to 1400° C.

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