Method for depolymerizing polymethylmethacrylate
    1.
    发明授权
    Method for depolymerizing polymethylmethacrylate 失效
    聚甲基丙烯酸甲酯解聚方法

    公开(公告)号:US06469203B1

    公开(公告)日:2002-10-22

    申请号:US09787088

    申请日:2001-06-21

    IPC分类号: C07C6700

    CPC分类号: C07C67/333 C07C69/54

    摘要: The present invention relates to a process of recovering monomeric esters of substituted or unsubstituted acrylic acid from polymer material having corresponding structural units by depolymerization by means of a fine-grained heat-transfer medium which is maintained above the depolymerization temperature of the polymer material. In a reactor, the polymer material is brought in contact with hot, mechanically fluidized heat-transfer medium. The resulting vapors are withdrawn and condensed, where the hot heat-transfer medium is continuously supplied at one end of the reactor, and cooled heat-transfer medium is discharged at the other end.

    摘要翻译: 本发明涉及通过采用保持在聚合物材料的解聚温度以上的细粒度传热介质进行解聚而从具有相应结构单元的聚合物材料中回收取代或未取代的丙烯酸的单体酯的方法。 在反应器中,聚合物材料与热的机械流化的热传递介质接触。 所得到的蒸气被抽出和冷凝,其中热传递介质在反应器的一端连续供应,并且冷却的传热介质在另一端排出。

    Iodine gas laser device
    2.
    发明授权
    Iodine gas laser device 失效
    碘气激光装置

    公开(公告)号:US4068196A

    公开(公告)日:1978-01-10

    申请号:US707929

    申请日:1976-07-22

    IPC分类号: H01S3/095 H01S3/22 H01S3/00

    CPC分类号: H01S3/2215 H01S3/09505

    摘要: A gas containing an active iodine compound is circulated through a laser tube, a purifying device and a gas reconstitution device. The active compound is consumed by lasing in the laser tube, waste products of the lasing action are removed by the purifying device and the gas reconstitution device maintains the concentration of the active compound at an operational level.

    摘要翻译: 含有活性碘化合物的气体通过激光管,净化装置和气体重构装置循环。 活性化合物通过激光管中的激光消耗,通过净化装置除去激光作用的废物,并且气体重构装置将活性化合物的浓度维持在操作水平。

    Non-dispersive infrared spectrometer
    4.
    发明授权
    Non-dispersive infrared spectrometer 失效
    非分散红外光谱仪

    公开(公告)号:US5486699A

    公开(公告)日:1996-01-23

    申请号:US372868

    申请日:1995-01-13

    IPC分类号: G01N21/3518 G01N21/35

    CPC分类号: G01N21/3518 G01N21/61

    摘要: A method and an apparatus for the selective determination of an isotope portion of a measuring gas by means of non-dispersive spectroscopy. The method includes sensitizing in a first ray path to the isotope component and sensitizing in a second ray path to the isotope-pure measuring gas, and electronically amplifying the measurement results. In order to improve the selectively and the sensitivity while maintaining a simple construction, an additional optical filtering is carried out in the first ray path by a filter filled essentially with isotope-pure measuring gas and the electronic measuring value of the second ray path is entered by influencing the amplification factor and an offset in the electronic amplification of the first ray path.

    摘要翻译: 一种通过非色散光谱法选择性测定测量气体的同位素部分的方法和装置。 该方法包括在第一射线路径中对同位素组分进行敏化,并在第二射线路径中对同位素纯测量气体进行敏化,并电子放大测量结果。 为了在保持简单结构的同时提高选择性和灵敏度,通过基本上用同位素纯测量气体填充的过滤器在第一射线路径中进行附加的光学过滤,并且进入第二射线路径的电子测量值 通过影响放大系数和第一射线路径的电子放大中的偏移。