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    101.
    发明专利
    未知

    公开(公告)号：DK334188D0

    公开(公告)日：1988-06-17

    申请号：DK334188

    申请日：1988-06-17

    Applicant: BASF AG

    Inventor： HORN DIETER ,  SCHMIDT HANS WILHELM ,  DITTER WALTER ,  HARTMANN HORST ,  LUEDDECKE ERIK ,  SCHMIEDER KLAUS

    IPC: A23K1/00 ,  A23L1/275 ,  A23L5/40 ,  A23L5/41 ,  A61K31/00 ,  B01J13/04 ,  C09B61/00 ,  C09B67/42

    Abstract: Finely divided, pulverulent carotinoid or retinoid compositions, in which the carotinoid or retinoid essentially has a particle size of less than 0.5 micron, are prepared by a process wherein a carotinoid or retinoid is dissolved in a volatile, water-miscible, organic solvent at from 50 DEG C. to 200 DEG C., if necessary under superatmospheric pressure, within the space of less than 10 seconds. The carotinoid is immediately precipitated, in a colloidally disperse form, from the molecularly disperse solution by rapidly mixing the latter with an aqueous solution of a swellable colloid at from 0 DEG C. to 50 DEG C., and the resulting dispersion is freed from the solvent and the dispersing medium in a conventional manner.

    106.
    发明专利
    未知

    公开(公告)号：DK10886D0

    公开(公告)日：1986-01-10

    申请号：DK10886

    申请日：1986-01-10

    Applicant: BASF AG

    Inventor： PFAFF KLAUS-PETER ,  PAUST JOACHIM ,  HARTMANN HORST

    IPC: C07H1/00 ,  B01J31/00 ,  C07B61/00 ,  C07H9/04 ,  C07H

    Abstract: Sugar ketals are prepared by reacting a sugar with a ketone in the presence of an acid catalyst by a process in which A. a molecular boron trifluoride compound or trifluoromethanesulfonic acid is used in an amount of only from 0.01 to 10% by weight, based on the sugar used, B. up to a 30-fold molar excess of the ketone is used and C. the water formed during the reaction is removed continuously from the reaction mixture. In a particularly advantageous embodiment of the process, the boron trifluoride is used in the form of boron trifluoride etherate and, when the reaction is complete, this compound or the trifluoromethanesulfonic acid is rendered ineffective under non-aqueous conditions, after which the ketone is evaporated off and the reaction mixture is then subjected to fractional distillation. The process is particularly important for the reaction of L-sorbose with acetone to obtain 2,3:4,6-di-O-isopropylidene-L-sorbofuranose, which is required for the synthesis of ascorbic acid.

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