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    Purification of hydrofluorocarbons
    1.
    发明授权
    Purification of hydrofluorocarbons 失效
    氢氟烃的净化

    公开(公告)号：US06488817B1

    公开(公告)日：2002-12-03

    申请号：US09052757

    申请日：1998-03-31

    申请人： Charles Francis Swain ,  Rajiv Ratna Singh ,  Hang Thanh Pham

    发明人： Charles Francis Swain ,  Rajiv Ratna Singh ,  Hang Thanh Pham

    IPC分类号： B01D336

    CPC分类号： C07C17/383 ,  Y10S203/13 ,  C07C19/08 ,  C07C19/10

    摘要： A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated in a first distillate and a majority of the other component is concentrated in a first bottoms; and (b) subjecting the first distillate in step (a) to at least one additional second distillation step conducted at a different pressure in which a majority of the component concentrated in said first distillate is concentrated in a second bottoms and in which the other component is concentrated in a second distillate; and (c) recovering purified HFC-32 from one of said first or second bottoms.

    摘要翻译： 一种净化二氟甲烷的方法，包括：（a）使包含至少二氟甲烷（HFC-32）和二氯二氟甲烷（CFC-12）的混合物经历第一蒸馏步骤，其中大部分CFC-12或HFC-32是 浓缩在第一馏出物中，并且大部分其它组分浓缩在第一塔底物中; 和（b）将步骤（a）中的第一馏出物经受至少一个额外的第二蒸馏步骤，其在不同的压力下进行，其中浓缩在所述第一馏出物中的大部分组分集中在第二塔底物中，其中另一组分 集中在第二个馏出物中; 和（c）从所述第一或第二底部之一回收纯化的HFC-32。