Method for the preparation of difluoromethane
    1.
    发明授权
    Method for the preparation of difluoromethane 失效
    二氟甲烷的制备方法

    公开(公告)号:US5495057A

    公开(公告)日:1996-02-27

    申请号:US398965

    申请日:1995-03-02

    CPC分类号: C07C17/206

    摘要: There is disclosed a method for the preparation of difluoromethane wherein methylene chloride is reacted with. hydrogen fluoride in liquid phase, at a temperature of about 70.degree. to 90.degree. C. under a pressure of about 11 to 12 kg/cm.sup.2.g in the presence of antimony pentachloride. It is important that the concentration of quinquevalent antimony is maintained at a level of 85% or more with the feed mole ratio of hydrogen fluoride to methylene chloride ranging from about 2.0 to 2.3.Applicable to industrial scale, the method is operated in a batch system or in a continuous system. In addition, it exhibits superior conversion rate of the materials and production yield.

    摘要翻译: 公开了二氯甲烷与二氯甲烷反应制备二氟甲烷的方法。 氟化氢在液相中,在约70至90℃的温度下,在约11至12kg / cm 2的压力下,在五氯化锑存在下。 重要的是,将氟化氢与二氯甲烷的进料摩尔比在约2.0至2.3范围内,将五价锑的浓度保持在85%或更高的水平。 适用于工业规模,该方法以批量系统或连续系统运行。 此外,它表现出优异的材料转化率和产量。