Process for preparing trioxane, polyoxymethylene and polyoxymethylene copolymers
    2.
    发明授权
    Process for preparing trioxane, polyoxymethylene and polyoxymethylene copolymers 有权
    制备三恶烷,聚甲醛和聚甲醛共聚物的方法

    公开(公告)号:US06653487B2

    公开(公告)日:2003-11-25

    申请号:US10176997

    申请日:2002-06-21

    IPC分类号: C07D32306

    摘要: A process for preparing trioxane by converting methanol to formaldehyde by dehydrogenation at a temperature of 300 to 1000° C., in the presence of a catalyst, wherein the catalyst is generated physically separately from the reactor and at a temperature above the dehydrogenation temperature, and trimerizing the formaldehyde prepared in this way to give trioxane. Also described is a process for preparing polyoxymethylene and polyoxymethylene copolymers from the formaldehyde.

    摘要翻译: 在催化剂存在下,在300〜1000℃的温度下通过脱氢将甲醇转化为甲醛的方法,其中所述催化剂与反应器物理分开生成,并且在高于脱氢温度的温度下生成,以及 以这种方式制备的甲醛三聚,得到三恶烷。 还描述了从甲醛制备聚甲醛和聚甲醛共聚物的方法。

    Separation of trioxane from liquid mixtures
    3.
    发明授权
    Separation of trioxane from liquid mixtures 失效
    三恶烷与液体混合物的分离

    公开(公告)号:US06433194B1

    公开(公告)日:2002-08-13

    申请号:US09787263

    申请日:2001-05-24

    IPC分类号: C07D32306

    CPC分类号: C07D323/06

    摘要: Process for the removal of trioxane from a liquid mixture comprising trioxane, formaldehyde, alcohol, hemiformals formed from the form-aldehyde and the alcohol, usual secondary components arising in the preparation of trioxane, and, in addition or as an alternative to the alcohol and the hemiformals, water, in which the trioxane is transferred into the gas phase by vaporization or evaporation and subsequently converted into a liquid state by condensation and obtained as condensate or converted into a solid state by desublimation and obtained as desublimate. Through the process, an increase in the concentration of the trioxane by 2.5 times or more is achieved.

    摘要翻译: 用于从三恶烷,甲醛,醇,由甲醛和醇形成的半形式的液体混合物中除去三恶烷的方法,在制备三恶烷中产生的通常的次要组分,以及另外或作为醇和 其中三恶烷通过蒸发或蒸发转移到气相中并随后通过缩合转化为液态并作为冷凝物获得,或者通过公认的方式转化成固体状态并作为稀释而获得。 通过该方法,可以使三恶烷的浓度提高2.5倍以上。

    Separation of liquid mixtures comprising formaldehyde, trioxane, alcohol and hemiformal
    5.
    发明授权
    Separation of liquid mixtures comprising formaldehyde, trioxane, alcohol and hemiformal 失效
    分离包含甲醛,三恶烷,乙醇和半缩甲醛的液体混合物

    公开(公告)号:US06201136B1

    公开(公告)日:2001-03-13

    申请号:US09436547

    申请日:1999-11-09

    IPC分类号: C07D32306

    CPC分类号: C07D323/06 B01D3/146

    摘要: In a process for separating liquid mixtures comprising formaldehyde, trioxane, alcohol, hemiformal formed from the formaldehyde and the alcohol, usual minor components and up to 5% by weight of water, the liquid mixture is distilled batchwise or continuously at reduced pressure, atmospheric pressure or superatmospheric pressure in suitable apparatuses which are to be connected to one another in an appropriate manner, and the trioxane is produced in very high purity. The other materials of value, formaldehyde and alcohol, present in the mixture can likewise optionally be separated off and recycled or used otherwise, while the minor components are ejected.

    摘要翻译: 在分离由甲醛,三恶烷,醇,由甲醛和醇形成的半缩甲醛,通常的次要成分和最多5重量%的水的液体混合物的分离过程中,液体混合物在减压,大气压下分批或连续蒸馏 或在适当的设备中以适当的方式相互连接的超大气压,并且三恶烷以非常高的纯度制备。 存在于混合物中的价值的其它材料,甲醛和乙醇也同样可以任意地被分离出来并再循环,否则以其他方式使用,而次要组分被喷出。