Reaction column in a special combination with a natural circulation evaporator
    1.
    发明授权
    Reaction column in a special combination with a natural circulation evaporator 有权
    反应塔与自然循环蒸发器特殊组合

    公开(公告)号:US07544832B2

    公开(公告)日:2009-06-09

    申请号:US10503005

    申请日:2002-02-15

    IPC分类号: C07C249/00

    摘要: An arrangement for carrying out chemical reactions comprises at least one distillation column and/or at least one container and at least one circulation evaporator, which are connected to one another via connecting elements, liquid being taken off completely or partly from a tray or from a stacked packing bed or from a dumped packing bed or from a liquid collector of the distillation column or being fed as an external feed stream below the lower tube sheet of the circulation evaporator to said evaporator.

    摘要翻译: 用于进行化学反应的装置包括至少一个蒸馏塔和/或至少一个容器和至少一个循环蒸发器,所述至少一个循环蒸发器通过连接元件彼此连接,液体完全或部分地从托盘或从托盘 堆叠的填料床或来自倾倒的填料床或来自蒸馏塔的液体收集器,或者作为外部进料流供给到循环蒸发器的下管板下方到所述蒸发器。

    Highly concentrated formaldehyde solution, production and reaction thereof

    公开(公告)号:US07193115B2

    公开(公告)日:2007-03-20

    申请号:US10494762

    申请日:2002-11-05

    IPC分类号: C07C47/00 A23J7/00

    摘要: In an aqueous formaldehyde solution comprising formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in a total concentration x of ≧65% by weight, the mean molar mass M of the polyoxymethylene glycols is, as a function of the formaldehyde concentration, equal to or less than the values given by equation I: ( M _ g ⁢ / ⁢ mol ) = 48 + 6.589 · 10 - 1 · ( x % ⁢ ⁢ by ⁢ ⁢ weight ) + 4.725 · 10 2 · ⁢ ( x % ⁢ ⁢ by ⁢ ⁢ weight ) 2 - 3.434 · 10 - 3 · ( x % ⁢ ⁢ by ⁢ ⁢ weight ) 3 + ⁢ 9.625 · 10 - 5 · ( x % ⁢ ⁢ by ⁢ ⁢ weight ) 4 - 1.172 · 10 6 · ⁢ ( x % ⁢ ⁢ by ⁢ ⁢ weight ) 5 + 5.357 · 10 - 9 · ( x % ⁢ ⁢ by ⁢ ⁢ weight ) 6 ( I ) where: M is the mean molar mass, and x is the total concentration of formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in % by weight (total formaldehyde concentration).

    Process for preparing methylenedianiline and methylenebis (phenylisocyanate)
    4.
    发明授权
    Process for preparing methylenedianiline and methylenebis (phenylisocyanate) 有权
    亚甲基二苯胺和亚甲基双(异氰酸苯酯)的制备方法

    公开(公告)号:US07230130B2

    公开(公告)日:2007-06-12

    申请号:US10843046

    申请日:2004-05-11

    IPC分类号: C07C263/10

    摘要: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C.In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.

    摘要翻译: 一种在酸催化剂存在下使苯胺与甲醛反应制备亚甲基二苯胺的方法,该方法包括在半连续方法中引入具有或不具有酸催化剂的苯胺,通过混合元件将甲醛与/或不含酸催化剂进料到其中具有或 没有酸催化剂和有或没有预先加入的甲醛循环,并且在进料至少要供入的甲醛总量的50%之后,将反应混合物加热到高于75℃的温度。另外,本发明涉及 涉及通过以这种方式获得的胺的光气化制备多异氰酸酯的方法以及通过该方法可获得的多异氰酸酯。

    Process for preparing methylenedianiline and methylenebis(phenyl isocyanate)
    8.
    发明授权
    Process for preparing methylenedianiline and methylenebis(phenyl isocyanate) 有权
    亚甲基二苯胺和亚甲基双(苯基异氰酸酯)

    公开(公告)号:US06831192B2

    公开(公告)日:2004-12-14

    申请号:US10152489

    申请日:2002-05-21

    IPC分类号: C07C26310

    摘要: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.

    摘要翻译: 一种在酸催化剂存在下使苯胺与甲醛反应制备亚甲基二苯胺的方法,该方法包括在半连续方法中引入具有或不具有酸催化剂的苯胺,通过混合元件将甲醛与/或不含酸催化剂进料到其中具有或 没有酸催化剂和有或没有预先加入的甲醛循环,并且在进料至少要加入的甲醛总量的50%之后,将反应混合物加热至高于75℃。此外,本发明涉及 涉及通过以这种方式获得的胺的光气化制备多异氰酸酯的方法以及通过该方法可获得的多异氰酸酯。

    Preparation of an aqueous solution of free hydroxylamine
    10.
    发明授权
    Preparation of an aqueous solution of free hydroxylamine 失效
    制备游离羟胺水溶液

    公开(公告)号:US06299734B1

    公开(公告)日:2001-10-09

    申请号:US09122099

    申请日:1998-07-24

    IPC分类号: B01D334

    CPC分类号: C01B21/1445

    摘要: An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is liberated and at the same time the solution obtained is separated by distillation into an aqueous hydroxylamine solution and a salt fraction. The novel process can be carried out in a simple and gentle manner and on a large scale. The danger of decomposition is minimized owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process.

    摘要翻译: 游离羟胺的水溶液是通过在汽提塔中通过逆流法在氨基处理羟胺而制备的,其中羟胺被释放,同时将得到的溶液通过蒸馏分离成羟胺水溶液和 盐分。 新颖的过程可以简单而温和的方式进行,大规模进行。 由于热负荷低,羟胺浓度低,并且在该过程中停留时间短,所以分解的危险被最小化。