13.
    发明专利
    未知

    公开(公告)号:DE19530291A1

    公开(公告)日:1997-02-20

    申请号:DE19530291

    申请日:1995-08-17

    Applicant: BASF AG

    Abstract: Column plates for a material exchange column, esp. with a peripheral supporting ring and supporting elements holding plates with through-holes, esp. perforations, valves or bubble caps comprise: (1) a liquid-tight join, pref. weld, esp. in discrete areas, between (a) the plates and the supporting elements and/or ring, (b) the supporting elements and (c) the supporting elements and the wall of the column or supporting ring; and (2) adjacent plates and supporting elements are sepd. from one another and from the column wall or supporting ring by gaps with a width of 1-15, pref. 1-7 mm. Also claimed are material exchange columns with plates of this type and a method of producing the plates.

    15.
    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

    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.

    16.
    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

    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

    COLUMN PLATE FOR MASS TRANSFER
    20.
    发明专利

    公开(公告)号:CZ235396A3

    公开(公告)日:1997-05-14

    申请号:CZ235396

    申请日:1996-08-09

    Applicant: BASF AG

    Abstract: Column plates for a material exchange column, esp. with a peripheral supporting ring and supporting elements holding plates with through-holes, esp. perforations, valves or bubble caps comprise: (1) a liquid-tight join, pref. weld, esp. in discrete areas, between (a) the plates and the supporting elements and/or ring, (b) the supporting elements and (c) the supporting elements and the wall of the column or supporting ring; and (2) adjacent plates and supporting elements are sepd. from one another and from the column wall or supporting ring by gaps with a width of 1-15, pref. 1-7 mm. Also claimed are material exchange columns with plates of this type and a method of producing the plates.

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