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    16.
    发明专利
    未知

    公开(公告)号：DE102005037328A1

    公开(公告)日：2007-02-08

    申请号：DE102005037328

    申请日：2005-08-04

    Applicant: BASF AG

    Inventor： WOELFERT ANDREAS ,  KNOESCHE CARSTEN ,  HEILIG MANFRED ,  STROEFER ECKHARD

    IPC: C07C263/10 ,  C07C263/20 ,  C07C265/00

    Abstract: Diisocyanates production includes supplying gas flow containing diamine and phosgene to reaction zone, separating surplus phosgene and hydrogen chloride gas from gaseous reaction mixture, feeding back the separated phosgene into the reaction, and separating hydrogen chloride (15 wt.%) from the feedback phosgene stream. The mass fraction of hydrogen chloride in the phosgene-containing stream before mixing with the amine-containing stream is less than 15 wt.%. A chlorobenzene inert medium with gas volume of more than 0.0001-30 is added to the diamine- and/or phosgene-containing gas stream. Diisocyanates production includes supplying gas flow containing diamine and phosgene to reaction zone, separating surplus phosgene and hydrogen chloride gas from gaseous reaction mixture, feeding back the separated phosgene into the reaction, and separating hydrogen chloride (15 wt.%) from the feedback phosgene stream. The mass fraction of hydrogen chloride in the phosgene-containing stream before mixing with the amine-containing stream is less than 15 wt.%. A chlorobenzene inert medium with gas volume of more than 0.0001-30 is added to the diamine- and/or phosgene-containing gas stream. The reaction of the diamine with phosgene takes place in a reaction chamber (IV) at 0.1-20 bar and at 200-600[deg]C. The flow in the reaction chamber exhibits Bodenstein number of more than 10. The average contact time of the reaction mixture is 0.001-5 seconds, and the molecular ratio of phosgene to amino groups is 1.1: 1-20: 1. The isocyanate is 1,6-diisocyanatohexane, 1-isocyanato-3,3,5 tri methyl-5-(isocyanatomethyl) cyclohexane, 4,4 '-di(isocyanatocyclohexyl)methane and toluylene diisocyanate isomeric mixtures.

    17.
    发明专利
    未知

    公开(公告)号：AT349422T

    公开(公告)日：2007-01-15

    申请号：AT03755040

    申请日：2003-05-19

    Applicant: BASF AG

    Inventor： WOELFERT ANDREAS ,  MUELLER CHRISTIAN ,  STROEFER ECKHARD ,  BRODHAGEN ANDREAS

    IPC: C07C263/10 ,  C07C265/14 ,  B01J19/24

    Abstract: The present invention relates to a continuous process for preparing isocyanates by reacting primary amines with phosgene, wherein the reaction is carried out in a cascade of at least two tube reactors and the gas phase formed in the reaction is separated off in a phase separator after each reactor and only the liquid phase is passed to the next reactor or to product purification and the reaction volume of the first tube reactor is only a fraction of the total reaction volume.

    18.
    发明专利
    未知

    公开(公告)号：AT346037T

    公开(公告)日：2006-12-15

    申请号：AT03789289

    申请日：2003-12-16

    Applicant: BASF AG

    Inventor： WOELFERT ANDREAS ,  PALLASCH HANS-JUERGEN ,  STROEFER ECKHARD ,  BLANKERTZ HEINRICH-JOSEF

    IPC: C07C263/10 ,  C07C263/20 ,  C07C265/14

    Abstract: Method for purifying isocyanates (I) by distillation. Method for purifying isocyanates by distillation comprises: (a) first separating a stream (1) containing (I), high and low boilers and non-evaporatable residue (X) by distillation (at least one theoretical plate) into a sidestream (2), containing (I) and (X), and a vapor stream (3), containing (I) and low boilers; (b) (X) in (2) is kept separate from (3) and/or material streams that consist at least partly of (3); (c) another (I)-containing vapor stream (4) is separated from (2), leaving stream (8) consisting essentially of (X); (d) streams (4) and (3) are separated by distillation into 3 streams (5,6,7) of different boiling ranges, where the lowest boiler (5) contains a significant proportion of the low boilers in (1), the highest boiler (7) contains a significant proportion of the high boilers in (1) and the middle stream (6) is essentially (I).

    20.
    发明专利
    未知

    公开(公告)号：DE102004026095A1

    公开(公告)日：2005-12-15

    申请号：DE102004026095

    申请日：2004-05-25

    Applicant: BASF AG

    Inventor： WOELFERT ANDREAS ,  PALLASCH HANS-JUERGEN ,  STROEFER ECKHARD ,  PENZEL ULRICH ,  DEBERDT FILIP

    IPC: C07C263/10 ,  C07C265/12 ,  C07C265/14

    Abstract: A process for the preparation of isocyanates by reacting amines with phosgene, the phosgene-containing stream of starting materials (i) being substantially free of isocyanates and (ii) having a mass content of hydrogen chloride (referred to below as HCl) of less than 0.4% by mass, and a production plant for carrying out the process according to the invention.

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