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    • 46. 发明授权
    • Purification of hydrofluorocarbons
    • 氢氟烃的净化
    • US06488817B1
    • 2002-12-03
    • US09052757
    • 1998-03-31
    • Charles Francis SwainRajiv Ratna SinghHang Thanh Pham
    • Charles Francis SwainRajiv Ratna SinghHang Thanh Pham
    • B01D336
    • C07C17/383Y10S203/13C07C19/08C07C19/10
    • 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.
    • 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。