21.
    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

    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).

    23.
    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

    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.

    24.
    发明专利
    未知

    公开(公告)号:DE10153411A1

    公开(公告)日:2003-05-15

    申请号:DE10153411

    申请日:2001-10-30

    Applicant: BASF AG

    Abstract: Separation of mixture of amine(s), water, low-boiling fraction and optionally high-boiling fraction includes optional distillative separation of low and high-boiling fractions, extraction of mixture with aqueous sodium hydroxide solution; and distillation of resultant aqueous-organic phase to recover anhydrous amine(s) from sump or side in separation part of column and amine/water azeotrope. Separation of a mixture containing amine(s) (I), water, low-boiling fraction (II) and optionally high-boiling fraction (III) comprises: (i) optional distillative separation of a first low-boiling fraction; (ii) optional distillative separation of a first high-boiling fraction; (iii) extraction of the mixture with aqueous sodium hydroxide (NaOH) solution, giving a first aqueous phase containing NaOH solution and a second aqueous-organic phase (IV) containing amines, other low-boiling fractions and optionally other high-boiling fractions; and (iv) distillation of the aqueous-organic phase to recover anhydrous amines as sump discharge or side discharge in the separation part of the column, an amine/water azeotrope, which is recycled to (iii), as side discharge in the concentration part and further low-boiling fraction as top discharge.

    25.
    发明专利
    未知

    公开(公告)号:DE10129233A1

    公开(公告)日:2003-01-02

    申请号:DE10129233

    申请日:2001-06-19

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing isocyanates by reacting primary amines with phosgene, and using isocyanate as the solvent. The inventive method is characterized in that a portion or the entire quantity of the isocyanate used as the solvent is only added to the reaction batch once the amine and the phosgene have been combined.

    27.
    发明专利
    未知

    公开(公告)号:BRPI0512358B1

    公开(公告)日:2015-02-10

    申请号:BRPI0512358

    申请日:2005-06-22

    Applicant: BASF AG

    Abstract: The invention relates to a process for preparing isocyanates by reacting amines with phosgene in the gas phase in a reaction zone, with the reaction mixture being passed through a zone into which a liquid is sprayed to stop the reaction, wherein the reaction mixture is passed through a zone having a reduced flow cross section between the reaction zone and the zone into which the liquid is sprayed.

    30.
    发明专利
    未知

    公开(公告)号:BRPI0511449A

    公开(公告)日:2007-12-26

    申请号:BRPI0511449

    申请日:2005-05-21

    Applicant: BASF AG

    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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