Process for recovery of olefinic nitriles
    1.
    发明授权
    Process for recovery of olefinic nitriles 失效
    回收烯烃腈的方法

    公开(公告)号:US4166008A

    公开(公告)日:1979-08-28

    申请号:US820479

    申请日:1977-07-29

    摘要: In the recovery and purification of acrylonitrile or methacrylonitrile obtained by the ammoxidation reaction of propylene or isobutylene, the bottoms stream associated with the column for extractively distilling acrylonitrile or methacrylonitrile is both reduced in size and increased in polymer concentration by removing a vapor stream containing water from the lower fourth of said column, thus reducing the amount of solids-containing waste streams to be treated.

    摘要翻译: {PG,1在通过丙烯或异丁烯的氨氧化反应获得的丙烯腈或甲基丙烯腈的回收和纯化中,与用于萃取蒸馏丙烯腈或甲基丙烯腈的塔相关的塔底料流的尺寸减小,并且通过除去蒸气而增加聚合物浓度 含有来自所述塔的较低四分之一的水的流,从而减少待处理的含固体废物流的量。

    Inexpensive purification of urea waste streams
    3.
    发明授权
    Inexpensive purification of urea waste streams 失效
    廉价的尿素废水净化

    公开(公告)号:US4188292A

    公开(公告)日:1980-02-12

    申请号:US847201

    申请日:1977-10-31

    CPC分类号: C02F1/72 C02F1/66 C02F2101/38

    摘要: Urea is destroyed in aqueous waste streams containing various anions and cations plus urea by contacting the stream with a cation exchange resin, then reacting the resulting stream with nitric oxide, nitrous acid or a nitrite salt to convert the urea to nitrogen, carbon dioxide and water and treating the resulting stream with an anion exchange resin. A pure aqueous stream is obtained which does not adversely affect the environment and which may be recycled to a plant as fresh water resulting in large monetary savings in fresh water cost.

    摘要翻译: 通过使该物流与阳离子交换树脂接触,然后使所得流与一氧化氮,亚硝酸或亚硝酸盐反应,将尿素转化为氮气,二氧化碳和水,使尿素在含有各种阴离子和阳离子的尿素水中被破坏 并用阴离子交换树脂处理所得流。 获得纯净的水流,其不会对环境产生不利影响,并且可以作为淡水循环到植物中,从而大量节省了淡水成本。

    Removal of cyanides from acetonitrile
    4.
    发明授权
    Removal of cyanides from acetonitrile 失效
    从乙腈中除去氰化物

    公开(公告)号:US4328075A

    公开(公告)日:1982-05-04

    申请号:US152006

    申请日:1980-05-21

    IPC分类号: B01D3/34

    CPC分类号: C07C253/34

    摘要: The present invention relates to a process for removing cyanides from a crude acetonitrile stream. Caustic and formaldehyde are added to an aqueous acetonitrile stream that contains cyanide. The formaldehyde "kills" the cyanides and provides a waste stream that can be conveniently disposed of.

    摘要翻译: 本发明涉及从粗乙腈流中除去氰化物的方法。 将苛性碱和甲醛加入到含有氰化物的乙腈水溶液中。 甲醛“杀死”氰化物,并提供可方便处理的废物流。