发明名称 |
PURIFICATION OF HYDROFLUOROCARBONS |
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 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 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.
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申请公布号 |
WO9950208(A1) |
申请公布日期 |
1999.10.07 |
申请号 |
WO1999US05917 |
申请日期 |
1999.03.19 |
申请人 |
ALLIEDSIGNAL INC. |
发明人 |
SWAIN, CHARLES, FRANCIS;SINGH, RAJIV, RATNA;PHAM, HANG, THANH |
分类号 |
C07C17/383;C07C19/08;C07C19/10;(IPC1-7):C07C17/383 |
主分类号 |
C07C17/383 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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