12.
    发明专利
    未知

    公开(公告)号:DE2845019A1

    公开(公告)日:1980-04-30

    申请号:DE2845019

    申请日:1978-10-16

    Applicant: BASF AG

    Abstract: A process for the continuous preparation of epsilon -caprolactam by Beckmann rearrangement of cyclohexanone-oxime, dissolved in a solvent which is inert toward oleum and is immiscible with oleum and water, at an elevated temperature, with removal of the heat of rearrangement by evaporation of the solvent, wherein oleum containing caprolactam is circulated successively through a conveying zone, a mixing zone, a boiling zone and a separating zone, upstream of the conveying zone oleum is added at the rate at which it is consumed, in the mixing zone cyclohexanone-oxime dissolved in solvent is added under turbulent conditions, in the boiling zone the heat of rearrangement is removed in a conventional manner by evaporating the solvent and recycling the condensate, and in the separating zone the reaction mixture is separated into a solvent phase, from which solvent is withdrawn at the rate at which the phase is formed, and a caprolactam-containing oleum phase, which is removed at the rate at which it is formed.

    14.
    发明专利
    未知

    公开(公告)号:DE2309435A1

    公开(公告)日:1974-09-05

    申请号:DE2309435

    申请日:1973-02-24

    Applicant: BASF AG

    Abstract: Procedure for the stabilization of polyamides against oxidative influences and thermal dissociation, characterized in that compounds of formula are added as stabilizers **(See formula)** where X signifies -NH-uO-R1 signifies a carbonyl alkyl or carbaryl group, the alkyl moieties being straight chain or branched hydrocarbon moieties with 1 to 20 carbon atoms and the aryl moieties being phenyl moieties or naphthyl moieties, which may be arbitrarily substituted, Y means **(See formula)** where R means a residue, which is derived from aliphatic, aromatic or mixed aliphatic/aromatic diisocyanates, and R is a residue derived from aliphatic or aromatic dicarboxylic acids. (Machine-translation by Google Translate, not legally binding)

    15.
    发明专利
    未知

    公开(公告)号:DE2305144A1

    公开(公告)日:1974-08-08

    申请号:DE2305144

    申请日:1973-02-02

    Applicant: BASF AG

    Abstract: High molecular weight linear polycarbonates are prepared by continuous condensation of organic dihydroxy compounds and phosgene in two reaction zones, a mixture of an aqueous-alkaline solution of the organic dihydroxy compound and an aqueous catalyst solution being introduced at the rate of from 1 to 50 meters per second and the phosgene at the rate of from 30 to 300 meters per second into the first reaction zone and condensed, an organic solvent being incorporated into the resultant reaction mixture containing oligomer and polycarbonate and the condensation of the aqueous-organic reaction mixture carried to completion in the second reaction zone by the two-phase interfacial method.

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