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    12.
    发明专利
    未知

    公开(公告)号：DE4241942A1

    公开(公告)日：1994-06-16

    申请号：DE4241942

    申请日：1992-12-11

    Applicant: BASF AG

    Inventor： BOECK STEFAN DR ,  HERZOG KLAUS DR ,  FISCHER ROLF DR ,  VOGEL HERBERT DR ,  FISCHER MARTIN DR

    IPC: C07D301/10 ,  B01J23/50 ,  B01J23/96 ,  B01J38/12 ,  B01J38/16 ,  C07D303/04

    Abstract: PCT No. PCT/EP93/03352 Sec. 371 Date Mar. 17, 1995 Sec. 102(e) Date Mar. 17, 1995 PCT Filed Nov. 30, 1993 PCT Pub. No. WO94/13653 PCT Pub. Date Jun. 23, 19943,4-Epoxy-1-butene is prepared by the gas phase epoxidation of 1,3-butadiene by means of oxygen or oxygen-containing gases over silver-containing catalysts and isolation of the 3,4-epoxy-1-butene from the reaction exit mixture by performing the gas phase epoxidation in the presence of from 6 to 80 mol % of water vapor, based on the gas mixture supplied to the reactor.

    17.
    发明专利
    未知

    公开(公告)号：DE4341770A1

    公开(公告)日：1995-06-14

    申请号：DE4341770

    申请日：1993-12-08

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  VOGEL HERBERT DR ,  EXNER HERBERT DR ,  KRATZ DETLEF DR ,  BRUDERMUELLER MARTIN DR

    IPC: C07C59/08 ,  C07C67/08 ,  C12P7/56 ,  C12R1/245 ,  C07C69/68 ,  C07D319/10

    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

    19.
    发明专利
    未知

    公开(公告)号：DE3868360D1

    公开(公告)日：1992-03-26

    申请号：DE3868360

    申请日：1988-06-24

    Applicant: BASF AG

    Inventor： KRABETZ RICHARD DR ,  DUEMBGEN GERD DR ,  MERGER FRANZ DR ,  JAEGER MICHAEL ,  THIESSEN FRITZ DR ,  VOGEL HERBERT DR

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

    Abstract: Prodn. of methacrylic acid (I) by gas phase oxidn. of methacrolein (IIA) or isobutyraldehyde (IIB) with gas mixts. contg. O2 and steam is carried out on catalysts (III) contg. Mo and P at 250-400 deg.C. The hot reaction gas is cooled to under 100 deg.C and passed to an absorption column operating with water below 100 deg.C for absorption of the (I) formed, then partly recycled to the reactor after adding the reqd. amt. of (II) and O2. The novel features are that: (a) (II) in an amt. equal to the amt. consumed is added in liq. form to the reaction gas in the lower two-thirds of the absorption column, in conjunction with polymerisation inhibitors (IV); and (b) a side stream of the reactor gas is taken before addn. of (II) or after the absorption column, and scrubbed in a scrubbing column operating with water at 0 to under 10 deg.C to remove unreacted (II) and this is passed to the top of the absorption column as aq. soln.

    20.
    发明专利
    未知

    公开(公告)号：DE3721865A1

    公开(公告)日：1989-01-12

    申请号：DE3721865

    申请日：1987-07-02

    Applicant: BASF AG

    Inventor： KRABETZ RICHARD DR ,  DUEMBGEN GERD DR ,  MERGER FRANZ DR ,  JAEGER MICHAEL ,  THIESSEN FRITZ DR ,  VOGEL HERBERT DR

    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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