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72 条记录 (耗时 0.012 秒)

    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

    申请人： Hsin C. Wu ,  William O. Fitzgibbons

    发明人： Hsin C. Wu ,  William O. Fitzgibbons

    IPC分类号： C07C255/03 ,  B01D20060101 ,  B01D3/00 ,  B01D3/40 ,  C07C20060101 ,  C07C67/00 ,  C07C253/00 ,  C07C255/08 ,  C07C121/32

    CPC分类号： C07C253/34 ,  B01D1/26 ,  Y10S203/03 ,  Y10S203/20

    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。

    Fractional distillation using a vapor side stream to control hcn concentration in purificatin of crude nitriles
    3.
    发明授权
    Fractional distillation using a vapor side stream to control hcn concentration in purificatin of crude nitriles 失效
    使用蒸气边流控制硝酸还原剂中的HCN浓度的分级蒸馏

    公开(公告)号：US3862890A

    公开(公告)日：1975-01-28

    申请号：US41270373

    申请日：1973-11-05

    申请人： PRESSON ROBERT D ,  GRIGSBY ALBERT J

    发明人： PRESSON ROBERT D ,  GRIGSBY ALBERT J

    IPC分类号： C07C121/32

    CPC分类号： C07C253/34 ,  Y10S203/03 ,  C07C255/08

    摘要： Crude acrylonitrile or crude methacrylonitrile containing small amounts of water and HCN are fractionally distilled in a drying column to take an overhead stream of nitrile, water and HCN and a bottoms stream of the nitrile and HCN. The invention is a vapor side stream taken from the bottom half of the column which is very convenient to purify by a simple fractional distillation.

    摘要翻译： 将含有少量水和HCN的粗丙烯腈或粗甲基丙烯腈在干燥塔中分馏，以得到腈，水和HCN的顶部物流和腈和HCN的底部物流。 本发明是从柱的下半部分获得的蒸气侧流，其通过简单的分馏非常方便地进行纯化。

    Purification of acrylonitrile by absorption plural distillation andrecycle of bottoms stream to the absorber
    4.
    发明授权
    Purification of acrylonitrile by absorption plural distillation andrecycle of bottoms stream to the absorber 失效
    通过吸收式蒸馏来纯化丙烯腈，并将乙酸乙酯溶液回收至吸收剂

    公开(公告)号：US3636067A

    公开(公告)日：1972-01-18

    申请号：US3636067D

    申请日：1969-10-10

    申请人： MONSANTO CO

    发明人： LOVETT GORDON H ,  RAMBIN RONALD E

    IPC分类号： B01D3/40 ,  C07C121/32

    CPC分类号： C07C253/34 ,  Y10S203/03 ,  C07C255/08

    摘要： D R A W I N G
    A PROCESS FOR THE REDUCTION OF METHACRYLONITRILE CONTENT OF PRODUCT ACRYLONITRILE WHICH COMPRISES INTRODUCING AT LEAST A PORTION OF A BOTTOM FRACTION FROM ANY ACRYLONITRILE HEAVY ENDS SPLITTER COLUMN INTO AN ABSORBING COLUMN, TAKING OVERHEAD FROM SAID ABOSRBING COLUMN A FRACTION CONTAINING AT LEAST PART OF THE METHACRYLONITRILE, TAKING A BOTTOM, FRACTION FROM THE ABSORBING COLUMN, REMOVING THE ABSORBING SOLVENT FROM THE BOTTOM FRACTION AND RETURNING THE ACRYLONTRILE IN THE BOTTOM FRACTION TO THE ACRYLONTRILE HEAVY ENDS SPLITTER COLUMN.