Method for purification of formaldehyde, use thereof and plastics produced therewith
    2.
    发明授权
    Method for purification of formaldehyde, use thereof and plastics produced therewith 失效
    甲醛净化方法及其用途及其生产的塑料

    公开(公告)号:US06229053B1

    公开(公告)日:2001-05-08

    申请号:US09530442

    申请日:2000-05-25

    IPC分类号: C07C4500

    摘要: Abstract A process for purifying formaldehyde in which the formaldehyde is scrubbed with alcohol in an absorption unit and in the course of this reacted virtually completely to form the hemiformal and is simultaneously separated off from gaseous impurities in a first purification step. In a desorption unit, the residual impurities are then converted into a gaseous state and separated off from the liquid hemiformal, whereupon the purified hemiformal is thermally cleaved into alcohol and formaldehyde in a pyrolysis unit. The formaldehyde thus prepared is suitable, for example, for preparing oligomers, polymers, dyestuffs and fertilizers, as well as for the treatment of seeds. Process for purifying formaldehyde, its use and plastics prepared using it

    摘要翻译: 摘要一种净化甲醛的方法,其中甲醛在吸收单元中用醇洗涤,并且在此过程中几乎完全反应形成半形状,并且在第一纯化步骤中同时与气态杂质分离。 在解吸单元中,然后将残留的杂质转化为气态,并与液体hemiformal分离出来,从而将纯化的hemiformal在热解单元中热切成醇和甲醛。 如此制备的甲醛适用于例如制备低聚物,聚合物,染料和肥料以及用于种子的处理。 甲醛净化方法,使用方法及使用它制备的塑料

    Method for non-oxidative production of formaldehyde from methanol
    3.
    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。