Production of dihalomethanes containing fluorine and azeotropes of
dihalomethanes containing chlorine with HF
    36.
    发明授权
    Production of dihalomethanes containing fluorine and azeotropes of dihalomethanes containing chlorine with HF 失效
    含有氟的二卤代甲烷的生产和含有氯的二卤代甲烷与HF的共沸物

    公开(公告)号:US5955637A

    公开(公告)日:1999-09-21

    申请号:US458604

    申请日:1995-06-02

    CPC分类号: C07C19/10 C07C17/206

    摘要: A process for producing difluoromethane is disclosed which includes the step of contacting a gaseous mixture containing CH.sub.2 Cl.sub.2 and hydrogen fluoride with a catalyst containing a catalytically effective amount of trivalent chromium supported on a carbon having an ash content of less than 0.5 percent by weight, at a temperature of from about 180.degree. C. to about 375.degree. C. The catalyst and temperature conditions of this process allow the concurrent reaction CCl.sub.3 CF.sub.3 with HF to form CCl.sub.2 FCF.sub.3. CH.sub.2 ClF and unreacted CH.sub.2 Cl.sub.2, each of which may be recovered as an azeotrope with HF, may be recycled.

    摘要翻译: 公开了一种制备二氟甲烷的方法,其包括使含有CH 2 Cl 2和氟化氢的气体混合物与含有催化有效量的三价铬的催化剂接触的步骤,所述催化有效量的三价铬负载在灰分含量小于0.5重量%的碳上, 温度为约180℃至约375℃。该方法的催化剂和温度条件允许CCl 3 CF 3与HF同时反应形成CCl 2FCF 3。 CH 2 ClF和未反应的CH 2 Cl 2,其各自可以与HF共沸回收,可以循环使用。

    Process for preparing pentafluoroethane
    38.
    发明授权
    Process for preparing pentafluoroethane 失效
    五氟乙烷的制备方法

    公开(公告)号:US5841006A

    公开(公告)日:1998-11-24

    申请号:US755823

    申请日:1996-11-26

    申请人: Paolo Cuzzato

    发明人: Paolo Cuzzato

    摘要: Process for preparing pentafluoroethane (125) containing amounts of 115 lower than 0.02% by weight wherein pentafluoroethane is obtained by a dismutation process of tetrafluorochloroethane CF.sub.3 CHClF (HCFC-124) in gaseous phase in the presence of a chrome oxide catalyst (CR.sub.2 O.sub.3) supported on a AlF.sub.3 support, wherein one operates at temperatures from 140.degree.-180.degree. C. for contact times comprised between 15-30 seconds, from >180.degree. C. to 240.degree. C. for contact times between 5 to 15 seconds, from >240.degree. C. to 260.degree. C. for contact times between 1 to 5 seconds, from >260.degree. to 300.degree. C. for contact times between 0.1 to 1 second.

    摘要翻译: 制备含量低于0.02重量%的五氟乙烷(125)的方法,其中五氟乙烷通过四氟氯乙烷CF 3 CHClF(HCFC-124)在气相中的存在下,在负载在载体上的氧化铬催化剂(CR 2 O 3) AlF 3载体,其中一个在140-180℃的温度下操作,接触时间为15-30秒,从> 180℃至240℃,接触时间为5至15秒,> 240℃ 接触时间为1至5秒,从260℃至300℃,接触时间为0.1至1秒。

    Process for manufacture of high purity 1,1-dichlorotetrafluoroethane
    39.
    发明授权
    Process for manufacture of high purity 1,1-dichlorotetrafluoroethane 失效
    制备高纯度1,1-二氯四氟乙烷的方法

    公开(公告)号:US5831136A

    公开(公告)日:1998-11-03

    申请号:US637630

    申请日:1996-04-29

    摘要: This invention relates to processes for the manufacturing of 1,1-dichlorotetrafluoroethane (i.e., CF.sub.3 CCl.sub.2 F or CFC-114a), and more particularly to processes for manufacturing CF.sub.3 CCl.sub.2 F substantially free of its isomer, 1,2-dichlorotetrafluoroethane (i.e., CClF.sub.2 CClF.sub.2 or CFC-114).

    摘要翻译: PCT No.PCT / US94 / 09531 Sec。 371日期:1996年4月29日 102(e)日期1996年4月29日PCT 1994年9月1日PCT公布。 出版物WO95 / 12564 日期1995年5月11日本发明涉及1,1-二氯四氟乙烷(即CF 3 CCl 2 F或CFC-114a)的制备方法,更具体地涉及制备基本上不含异构体的1,2-二氯四氟乙烷(即, CClF 2 CClF 2或CFC-114)。