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    11.
    发明专利
    未知

    公开(公告)号：DK228988D0

    公开(公告)日：1988-04-27

    申请号：DK228988

    申请日：1988-04-27

    Applicant: BASF AG

    Inventor： DOBLER WALTER ,  PAUST JOACHIM

    IPC: C07B61/00 ,  C07H3/02

    Abstract: Continuous process for the epimerisation of pentoses and hexoses by heating a sugar dissolved in a solvent in the presence of a basic anion exchanger loaded with a molybdenum(VI) compound, which is characterised in that, for the preparation of a D- or L-sugar with cis-OH groups in the 2- and 3-position of the sugar, a homogeneous solution of the corresponding sugar with trans-OH groups in the 2- and 3-position of the sugar is passed continuously in a mixture of water and methanol or ethanol at temperatures from 70 to 100 DEG C, preferably 73 to 80 DEG C, through a reaction tube which contains the basic anion exchanger loaded with the molybdenum(VI) compound. This process is particularly suitable for the epimerisation of D-arabinose to the D-ribose needed for the preparation of riboflavin.

    CONTINUOUS PROCESS FOR PRODUCING PSEUDOIONONES AND IONONES
    13.
    发明专利
    CONTINUOUS PROCESS FOR PRODUCING PSEUDOIONONES AND IONONES 未知

    公开(公告)号：AU2003285305A1

    公开(公告)日：2004-06-07

    申请号：AU2003285305

    申请日：2003-10-28

    Applicant: BASF AG

    Inventor： DOBLER WALTER ,  BAHR NICOLAUS ,  BREUER KLAUS ,  KINDLER ALOIS

    IPC: C07C45/54 ,  C07C45/74 ,  C07C49/203 ,  C07C403/16

    Abstract: The invention relates to a continuous process for producing pseudoionones of general formulas (I) and (I') as well as isomers thereof, whereby: R 1 represents CH 3 or (a); R 2 and R 3 represent hydrogen, CH 3 or C 2 H 5 , and; R 4 and R 5 represent hydrogen or CH 3 . These pseudoionones are produced by reacting an aldehyde of formula (II) with an excess of a ketone of general formula (III), whereby R 1 , R 2 and R 3 have the aforementioned meanings, in the presence of water and alkali hydroxide at an increased temperature and in a homogeneous solution. The inventive process is characterized in that: a) the intermixing of the homogeneous solution consisting of aldehyde, ketone and aqueous alkali lye occurs at a temperature ranging from 10 to 120° C.; b) the undissolved water and alkali hydroxide contained in the reaction mixture are subsequently separated out; c) while avoiding back mixing, the homogeneous reaction mixture is then guided through a reactor, which permits a residence time ranging from 2 to 300 minutes, at a temperature that is 10 to 120° C. higher than the boiling point of the lowest-boiling component and under a vapor pressure p ranging from 10 6 to 10 7 Pa; d) the reaction mixture is cooled by expansion; e) ketone is removed from the reaction mixture using vapor flowing in the opposite direction and; f) the raw product is dried and rid from excessive aldehyde and secondary components via a rectification column.

    CONTINUOUS PROCESS FOR PRODUCING PSEUDOIONONES AND IONONES
    14.
    发明专利
    CONTINUOUS PROCESS FOR PRODUCING PSEUDOIONONES AND IONONES 未知

    公开(公告)号：CA2505094A1

    公开(公告)日：2004-05-21

    申请号：CA2505094

    申请日：2003-10-28

    Applicant: BASF AG

    Inventor： BREUER KLAUS ,  KINDLER ALOIS ,  BAHR NICOLAUS ,  DOBLER WALTER

    IPC: C07C45/54 ,  C07C45/74 ,  C07C49/203 ,  C07C403/16

    Abstract: The invention relates to a continuous process for producing pseudoionones of general formulas (I) and (I.prime.) as well as isomers thereof, whereby: R1 represents CH3 or (a); R2 and R3 represent hydrogen, CH3 or C2H5, and; R4 an d R5 represent hydrogen or CH3. These pseudoionones are produced by reacting a n aldehyde of formula (II) with an excess of a ketone of general formula (III) , whereby R1, R2 and R3 have the aforementioned meanings, in the presence of water and alkali hydroxide at an increased temperature and in a homogeneous solution. The inventive process is characterized in that: a) the intermixing of the homogeneous solution consisting of aldehyde, ketone and aqueous alkal i lye occurs at a temperature ranging from 10 to 120 ~C; b) the undissolved water and alkali hydroxide contained in the reaction mixture are subsequentl y separated out; c) while avoiding back mixing, the homogeneous reaction mixtu re is then guided through a reactor, which permits a residence time ranging fro m 2 to 300 minutes, at a temperature that is 10 to 120 ~C higher than the boiling point of the lowest-boiling component and under a vapor pressure p ranging from 106 to 107 Pa; d) the reaction mixture is cooled by expansion; e) ketone is removed from the reaction mixture using vapor flowing in the opposite direction and; f) the raw product is dried and rid from excessive aldehyde and secondary components via a rectification column.

    PREPARATION OF DIHYDROXYDIONES
    19.
    发明专利
    PREPARATION OF DIHYDROXYDIONES 未知

    公开(公告)号：CA2001055A1

    公开(公告)日：1990-05-09

    申请号：CA2001055

    申请日：1989-10-19

    Applicant: BASF AG

    Inventor： HERMELING DIETER ,  BECKER RAINER ,  DOBLER WALTER

    IPC: C07C49/17 ,  C25B3/29 ,  C25B3/00

    Abstract: of the Disclosure: Dihydroxydiones of the general formula R-CO-CH(OH)-CH(OH)-CO-R I where R is alkyl, are prepared by a process in which an aldehyde of the general formula II where R has the abovementioned meaning, is subjected to electrolysis in a water-containing electrolyte which has a pH of less than 7.

    20.
    发明专利
    未知

    公开(公告)号：DE50308134D1

    公开(公告)日：2007-10-18

    申请号：DE50308134

    申请日：2003-10-28

    Applicant: BASF AG

    Inventor： DOBLER WALTER ,  BAHR NICOLAUS ,  BREUER KLAUS ,  KINDLER ALOIS

    IPC: C07C45/54 ,  C07C45/74 ,  C07C49/203 ,  C07C403/16

    Abstract: The invention relates to a continuous process for producing pseudoionones of general formulas (I) and (I') as well as isomers thereof, whereby: R 1 represents CH 3 or (a); R 2 and R 3 represent hydrogen, CH 3 or C 2 H 5 , and; R 4 and R 5 represent hydrogen or CH 3 . These pseudoionones are produced by reacting an aldehyde of formula (II) with an excess of a ketone of general formula (III), whereby R 1 , R 2 and R 3 have the aforementioned meanings, in the presence of water and alkali hydroxide at an increased temperature and in a homogeneous solution. The inventive process is characterized in that: a) the intermixing of the homogeneous solution consisting of aldehyde, ketone and aqueous alkali lye occurs at a temperature ranging from 10 to 120° C.; b) the undissolved water and alkali hydroxide contained in the reaction mixture are subsequently separated out; c) while avoiding back mixing, the homogeneous reaction mixture is then guided through a reactor, which permits a residence time ranging from 2 to 300 minutes, at a temperature that is 10 to 120° C. higher than the boiling point of the lowest-boiling component and under a vapor pressure p ranging from 10 6 to 10 7 Pa; d) the reaction mixture is cooled by expansion; e) ketone is removed from the reaction mixture using vapor flowing in the opposite direction and; f) the raw product is dried and rid from excessive aldehyde and secondary components via a rectification column.

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