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    PREPARATION OF LACTATE
    3.
    发明专利
    PREPARATION OF LACTATE 失效

    公开(公告)号：JPH07194387A

    公开(公告)日：1995-08-01

    申请号：JP30522594

    申请日：1994-12-08

    Applicant: BASF AG

    Inventor： HANSUUYOOZEFU SHIYUTERUTSUERU ,  HERUBERUTO FUOOGERU ,  HERUBERUTO EKUSUNAA ,  DETOREFU KURATSUTSU ,  MARUTEIN BURUUDAAMIYURAA

    IPC: C07C59/08 ,  C07C67/08 ,  C12P7/56 ,  C12R1/245

    Abstract: A process for the preparation of lactic acid esters by fermentation of mixtures containing sugars, conversion of the lactic acid resulting from the fermentation into its salts and subsequent esterification, characterised in that a) alkaline earth metal carbonate or bicarbonate is added to the fermentation broth in order to neutralise at least 50 mol% of the resulting lactic acid, b) the resulting fermentation broth is adjusted to a pH from 7 to 13 by adding NH3 and CO2, and the resulting precipitates are separated off, c) the ammonium lactate solution obtained and purified in this way is esterified with an alcohol

    6.
    发明专利
    失效

    公开(公告)号：JP2574406B2

    公开(公告)日：1997-01-22

    申请号：JP15702288

    申请日：1988-06-27

    Applicant: BASF AG

    Inventor： RIHIARUTO KURABETSUTSU ,  GERUTO DEYUMUGEN ,  FURANTSU MERUGAA ,  MIHAERU IEEGAA ,  FURITSUTSU CHIISEN ,  HERUBERUTO FUOOGERU

    IPC: B01J27/19 ,  C07B63/04 ,  C07C51/00 ,  C07C51/235 ,  C07C51/25 ,  C07C57/05 ,  C07C57/055 ,  C07C57/07 ,  C07C67/00

    Abstract: Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250 DEG to 400 DEG C. with cooling of the hot reaction gas to below 100 DEG C., absorption of the methacrylic acid in a water-operated absorption column, at below 100 DEG C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at

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