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    12.
    发明专利
    未知

    公开(公告)号：DE1643256A1

    公开(公告)日：1971-10-07

    申请号：DEB0095140

    申请日：1967-10-26

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  KOEHLER WALDEMAR DR ,  SCHULZ GERHARD DR ,  SPERBER HEINRICH DR

    IPC: C07D323/06 ,  C07D19/00

    Abstract: 1,199,650. Trioxane. BADISCHE-ANILIN- & SODA-FABRIK A.G. 28 Dec., 1967 [29 Dec., 1966; 26 Oct., 1967], No. 58816/67. Heading C2C. Trioxane is produced by heating aqueous formaldehyde solution in the presence of an acid catalyst in a reactor with simultaneous removal of the product gas containing trioxane, the concentration of catalyst in the reaction mixture being 2-25% by weight of mineral acid or an equivalent amount of another acid, the mean residence time of the aqueous formaldehyde solution in the reactor being from 2 minutes to 2 hours, and the vapour containing trioxane leaving the reactor being brought into contact with substantially completely reacted reaction mixture in a column having at least one theoretical tray.

    PRODUCTION OF FORMALDEHYDE
    15.
    发明专利
    PRODUCTION OF FORMALDEHYDE 未知

    公开(公告)号：GB1425751A

    公开(公告)日：1976-02-18

    申请号：GB3001273

    申请日：1973-06-25

    Applicant: BASF AG

    Inventor： DIEM HANS DR ,  MATTHIAS GUENTHER DR ,  AICHER ALBRECHT ,  HAAS HANS DR ,  SCHREIBER HANS DIPL ING ,  SPERBER HEINRICH DR

    IPC: C07C47/055 ,  C07C45/00 ,  C07C45/38 ,  C07C67/00 ,  D06P3/54 ,  C07C47/04 ,  C07C45/16

    Abstract: 1425751 Formaldehyde BADISCHE ANILIN- & SODA-FABRIK AG 25 June 1973 [26 June 1972] 30012/73 Heading C2C In a process for producing formaldehyde by oxidizing dehydrogenation of methanol in the presence of a silver catalyst at elevated temperature, the reaction is carried out at a temperature of 550‹ to 750‹ C. and during the reaction an additional vapour mixture of oxygen and water heated to at least 70‹ C. and providing 0À05 to 0À8 mole of water and of 0À005 to 0À06 mole of oxygen (O 2 ) based on 1 mole of feed methanol, is introduced into the vaporous starting mixture which has been heated to at least 60‹ C. and contains from 0À09 to 1À8 moles of water and 0À35 to 0À5 moles of oxygen (O 2 ) per 1 mole of methanol before said starting mixture enters the catalyst bed, the space velocity being 0À9 to 3 metric tons of methanol per square meter of catalyst bed cross-section per hour. The plant may consist of a plurality of reactors in parallel, and not all the reactors need be operated according to the invention, at least not all the time. The reaction temperature may be raised in steps. Baffles at which impurities collected and removed may be provided downstream of the point of introduction of the additional vapour mixture but upstream of the catalyst bed.

    Trioxane prepn catalysed by phosphoric acid
    17.
    发明专利
    Trioxane prepn catalysed by phosphoric acid 未知

    公开(公告)号：DE1814197A1

    公开(公告)日：1971-06-09

    申请号：DE1814197

    申请日：1968-12-12

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  SPERBER HEINRICH DR

    IPC: C07D323/06

    Abstract: Trioxane is prepared by heating concn. aqs. formaldehyde soln. in the presence of 25-80 wt. % phosphoric acid. The trioxane-containing synthesis gas is continuously removed from the reaction mixture. The average stay time of the aqs. formaldehyde soln. in the reactor is 2 mins. to 2 hrs.

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