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    153.
    发明专利
    未知

    公开(公告)号：DE10260093A1

    公开(公告)日：2004-07-01

    申请号：DE10260093

    申请日：2002-12-19

    Applicant: BASF AG

    Inventor： SOHN MARTIN ,  STROEFER ECKHARD ,  NEVEJANS FILIP ,  PENZEL ULRICH ,  PALLASCH HANS-JUERGEN ,  SANDER MICHAEL ,  SCHWARZ HANS VOLKMAR ,  MACKENROTH WOLFGANG

    IPC: C07C263/10 ,  C07C263/20 ,  C07C265/14 ,  B01D3/00

    Abstract: The present invention relates to a process for preparing isocyanates by reaction of amines with phosgene in a reactor and subsequent separation of the isocyanate from the reaction mixture leaving the reactor and purification of the isocyanate, wherein the separation and purification of the isocyanate is carried out in a column having a pressure at the top of 1-950 mbar, preferably 5-50 mbar, particularly preferably 10-20 mbar, and a temperature at the bottom of 90-250° C., preferably 120-170° C., particularly preferably 130-150° C., and the pure isocyanate stream is preferably taken off in liquid or gaseous form at a side offtake of the column.

    154.
    发明专利
    未知

    公开(公告)号：DE10260092A1

    公开(公告)日：2004-07-01

    申请号：DE10260092

    申请日：2002-12-19

    Applicant: BASF AG

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

    IPC: C07C263/10 ,  C07C263/20 ,  C07C265/14 ,  B01D3/00

    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).

    157.
    发明专利
    未知

    公开(公告)号：DE10222968A1

    公开(公告)日：2003-12-04

    申请号：DE10222968

    申请日：2002-05-23

    Applicant: BASF AG

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

    IPC: C07C263/10 ,  C07C265/14 ,  C07B43/10

    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.

    159.
    发明专利
    未知

    公开(公告)号：DE59905323D1

    公开(公告)日：2003-06-05

    申请号：DE59905323

    申请日：1999-01-26

    Applicant: BASF AG

    Inventor： STROEFER ECKHARD ,  JACOBS JAN ,  SEYFERT WILFRIED ,  SCHWARZ VOLKMAR ,  SCHWEERS OLAF ,  SCHARR VOLKER ,  PENZEL ULRICH

    IPC: C07B61/00 ,  C07C209/78 ,  C07C211/45 ,  C07C211/50 ,  C07C263/10 ,  C07C265/14

    Abstract: The production of methylene-di-phenylamine from aniline (A) and formaldehyde (F) with an acid catalyst (C) comprises placing (A) and possibly (C) in a reactor, feeding (F) and possibly (C) through a mixer into a circulation loop containing (A), possibly (C) and possibly (F), and heating to above 75 degrees C after adding at least 50% of the total (F). Independent claims are also included for: (a) mixtures containing methylene-di-phenylamine (MDA) obtained by this process; (b) a process for the production of polyisocyanates by phosgenation of these mixtures; (c) a process for the production of methylene-diphenylisocyanate (MDI) by phosgenation of MDA (obtained as above) at 50-150 degrees C and 0.5-10 bar, optionally in presence of inert solvent; (d) a process for the production of MDI comprising: (1) the semi-continuous process described above using a mol ratio of (A):(C) = (1:0.6)-(1:0.01) and a mol ratio of (A):(total F) = (1.7:1)-(7.2:1), in which the temperature of the circulating mixture is 20-75 degrees C and the mixture is heated for at least 0.2 hour at above 75 degrees C after adding at least 50% of the (F), (2) neutralization, (3) distillation of water and aniline, (4) phosgenation of the purified MDA as in (c) above, (5) removal of phosgene, hydrogen chloride and possibly solvent at below 150 degrees C under vacuum or inert gas, (6) removal of solvent at not above 1900 degrees C and (7) isolation of 2,2'-, 2,4'- and/or 4,4'-MDI and/or mixtures of at least two of these isomers by distillation at 2-50 mbar and 150-250 degrees C and/or by crystallization; and (e) polyisocyanates obtained by these processes.

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