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    VERFAHREN ZUR HERSTELLUNG VON ISOCYANATEN
    32.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON ISOCYANATEN 有权

    公开(公告)号：EP2197836A1

    公开(公告)日：2010-06-23

    申请号：EP08803255.2

    申请日：2008-08-27

    Applicant: BASF SE

    Inventor： RUMPF, Bernd ,  BOCK, Michael ,  FIENE, Martin ,  STROEFER, Eckhard

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

    CPC classification number: C07C263/10 ,  C07C263/20 ,  C07C265/14

    Abstract: The invention relates to a method for producing polyisocyanates, comprising the following steps: a) amines are reacted with phosgene; b) hydrogen chloride, excess phosgene, and, if necessary, the solvent are separated from the reaction mixture; c) the liquid mixture from step b) is separated into a liquid and a gaseous phase; d) the gaseous phase from step c) is processed into the polyisocyanate.

    Abstract translation: 本发明涉及一种生产多异氰酸酯的方法，包括以下步骤：a）胺与光气反应; b）将氯化氢，过量的光气和必要时的溶剂从反应混合物中分离出来; c）将来自步骤b）的液体混合物分离成液相和气相; d）将来自步骤c）的气相加工成多异氰酸酯。

    VERFAHREN ZUR HERSTELLUNG VON ISOCYANATEN DURCH THERMISCHE SPALTUNG VON CARBAMATEN
    36.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON ISOCYANATEN DURCH THERMISCHE SPALTUNG VON CARBAMATEN 有权
    用于生产ISOCYANATES BY氨基甲酸酯的热裂解

    公开(公告)号：EP2526085A1

    公开(公告)日：2012-11-28

    申请号：EP11700347.5

    申请日：2011-01-18

    Applicant: BASF SE

    Inventor： BOCK, Michael ,  FRANZKE, Axel ,  BAUMANN, Robert ,  STROEFER, Eckhard

    IPC: C07C263/04 ,  B01D3/00

    CPC classification number: C07C263/04 ,  B01D3/143 ,  C07C265/14

    Abstract: The invention relates to a method for producing isocyanates by thermally splitting carbamates, also known as carbamide acid ester or urethane. The carbamate splitting increases in significance as a phosgene-free method for producing isocyanates. Various apparatuses are proposed for technically performing the carbamate splitting, in particular columns (in EP 0 795 543), fluidized bed reactors (in EP 555 628 and in DE 199 07 648), falling film evaporators or thin film evaporators (in EP 0 092 738). The carbamate splitting can be carried out in the liquid or gas phase. The formation of high molecular weight byproducts is problematic when thermally splitting carbamates, said byproducts arising from continued reaction of the splitting products with themselves or with the initial materials. Said byproducts can lead to deposits in the apparatuses, thus limiting continuous operation and leading to loss of yield. The residues comprise in particular allophanates and isocyanurates. The byproducts also arise by the reaction of half-urethanes (semicarbamates, that is, a difunctional compound comprising a urethane and an isocyanate function, intermediate to splitting bisurethanes) with themselves. In order to prevent said problems, the split products isocyanate and alcohol must be separated from the carbamate split gas as quickly as possible. It is further known that the problems of back reaction and continued reaction are reduced in the course of splitting, in that the carbamate split is performed in the presence of solvents, because the reaction speed of the back reaction of isocyanate and alcohol (urethanization) and the continued reactions is dependent on the type of solvent and the dilution by the solvent. For example, J.H. Saunders and K.C. Frisch: Polyurethanes, Chemistry and Technology, 1962, P. 146, Table 10, Data on the reactivity of isocyanates having alcohols in the presence of different solvents.

    VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON ISOCYANATEN
    37.
    发明公开
    VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON ISOCYANATEN 有权

    公开(公告)号：EP2408738A2

    公开(公告)日：2012-01-25

    申请号：EP10709217.3

    申请日：2010-03-18

    Applicant: BASF SE

    Inventor： MATTKE, Torsten ,  KNÖSCHE, Carsten ,  RUMPF, Bernd ,  STROEFER, Eckhard

    IPC: C07C263/10 ,  C07C265/00

    CPC classification number: C07B43/10 ,  B01J2219/00873 ,  C07C263/10 ,  F28D7/00 ,  F28D13/00 ,  C07C265/14 ,  C07C265/00

    Abstract: The invention relates to a method for producing isocyanates by converting the corresponding amine with phosgene in the gas phase, in the presence of an inert medium as applicable, wherein phosgene and amine are first vaporized and then overheated to reaction temperature, the overheated phosgene and amine are mixed and added to a reactor wherein the phosgene and the amine are converted to isocyanate, wherein the dwell time of the phosgene at temperatures greater than 300°C equals a maximum of 5 sec and/or the temperature of heat transfer surfaces in contact with the phosgene is 20 K above the phosgene temperature to be set at maximum. The invention further relates to a device for producing isocyanates by converting the corresponding amine with phosgene in the gas phase.

    Abstract translation: 本发明涉及一种生产异氰酸酯的方法，该方法通过在惰性介质存在下将气相中的相应胺转化为气相，其中光气和胺首先被蒸发，然后过热至反应温度，过热的光气和胺 混合并加入其中光气和胺转化为异氰酸酯的反应器中，其中光气在高于300℃的温度下的停留时间等于最多5秒和/或与其接触的传热表面的温度 光气比光气温度高20K以设定最大值。 本发明还涉及一种通过在气相中用光气转化相应的胺来生产异氰酸酯的装置。

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