Separation of trioxane from liquid mixtures
    1.
    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。

    Process and device for preparing pure formaldehyde
    2.
    发明授权
    Process and device for preparing pure formaldehyde 失效
    制备纯甲醛的方法和装置

    公开(公告)号:US06414196B1

    公开(公告)日:2002-07-02

    申请号:US09530441

    申请日:2000-05-25

    IPC分类号: C07C4500

    摘要: A process for the post-purification in particular of pyrolysis gases for preparing pure formaldehyde, hemiformal being pyrolyzed in an evaporator, the resulting formaldehyde vapor being passed through a condensed liquid component collected in the bottom area of the evaporator, the condensed liquid component being passed out as a falling film situated on the inner wall through a cooled outlet tube disposed in the bottom area of the evaporator and the formaldehyde vapor being passed through the cooled outlet tube in cocurrent and the liquid component and the formaldehyde being taken off separately at the outlet tube end remote from the evaporator.

    摘要翻译: 用于后净化的方法,特别是用于制备纯甲醛的热解气体的方法,在蒸发器中热解的hemiformal,所得甲醛蒸气通过收集在蒸发器底部区域中的冷凝液体组分,冷凝的液体组分通过 通过设置在蒸发器的底部区域中的冷却的出口管作为位于内壁上的降膜,并且​​甲醛蒸气以并流的方式通过冷却的出口管,并且液体组分和甲醛在出口处分开取出 管端远离蒸发器。

    Process for preparing trioxane, polyoxymethylene and polyoxymethylene copolymers
    3.
    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。

    Method for non-oxidative production of formaldehyde from methanol
    10.
    发明授权
    Method for non-oxidative production of formaldehyde from methanol 失效
    从甲醇中非氧化生产甲醛的方法

    公开(公告)号:US06232507B1

    公开(公告)日:2001-05-15

    申请号:US09623660

    申请日:2000-09-26

    IPC分类号: C07C4541

    摘要: Process for the nonoxidative preparation of formaldehyde from methanol The invention relates to a process for preparing formaldehyde from methanol by dehydrogenation in a reactor at temperatures in the range from 300 to 1000° C. in the presence of a catalyst which is introduced into the reactor with the aid of a carrier gas to give a product gas mixture, wherein the formaldehyde is separated from the product gas mixture and at least part of the remaining product gas mixture is recirculated to the reactor in a circulating gas stream and the carrier gas used is a carbon-free gas or gas mixture.

    摘要翻译: 从甲醇中非氧化制备甲醛的方法本发明涉及一种在甲醇中通过在反应器中在300至1000℃的温度下脱氢制备甲醛的方法,所述催化剂在引入反应器中的催化剂存在下, 载体气体的帮助以产生产物气体混合物,其中甲醛与产物气体混合物分离,并且至少部分剩余的产物气体混合物以循环气流再循环到反应器中,并且所用载体为 无碳气体或气体混合物。