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    PROCESS FOR THE PREPARATION OF 2,3,3,3-TETRAFLUOROPROPENE (1234YF)
    1.
    发明公开
    PROCESS FOR THE PREPARATION OF 2,3,3,3-TETRAFLUOROPROPENE (1234YF) 审中-公开

    公开(公告)号：EP3325435A1

    公开(公告)日：2018-05-30

    申请号：EP16750478.6

    申请日：2016-07-14

    申请人： Mexichem Fluor S.A. de C.V.

    发明人： JOHNSON, Sheryl Louise ,  FLAHERTY, Stephen Andrew ,  MURRAY, James Henry ,  SMITH, Fiona Louise ,  MAN, Jonathan Junhay ,  GIDDIS, Clive Robert

    IPC分类号： C07C17/21 ,  C07C17/25 ,  C07C19/08 ,  C07C21/18 ,  C07C17/38

    CPC分类号： C07C17/21 ,  C07C17/25 ,  C07C17/38 ,  Y02P20/125 ,  Y02P20/582 ,  C07C19/08 ,  C07C21/18

    摘要： A process for preparing 2,3,3,3-tetrafluoropropene (1234yf), comprising (a) vapour phase catalytic fluorination of a first composition comprising 3,3,3-trifluoro-2-chloropropene (1233xf) with hydrogen fluoride (HF), preferably in the presence of air, to produce a fluorination product stream comprising 1,1,1,2,2-pentafluoropropane (245cb), HF and hydrochloric acid (HCl), (b) vapour phase catalytic dehydrofluorination of a second composition comprising 245cb to produce a dehydrofluorination product stream comprising 1234yf and HF; wherein the fluorination product stream and the dehydrofluorination product stream are combined and subjected to (c) purification to produce a product stream comprising 245cb and 1234yf. The purification may involve the use of distillation, scrubbing trains and/or phase separation to remove HF, HCl and possibly by-products such as 1,3,3,3-tetrafluoropropene (1234ze). The combined streams are preferably fed to the dehydrofluorination reactor as the second composition after purification and optionally after separation of at least a part of 1234yf. The process may comprise a further step, i.e. the dehydrochlorination of 1,1,1-trifluoro-2,3-dichloropropane (243db) to 1233xf, preferably in the presence of HF and without air. The HF recovered through purification may be recycled to this last reaction or to reaction (a), preferably after further purification by phase separation. The preferred catalyst for all the aforementioned reactions is a zinc/chromia catalyst.

    PROCESS FOR THE PREPARATION OF 1,1,1,2,2-PENTAFLUOROPROPANE
    5.
    发明公开
    PROCESS FOR THE PREPARATION OF 1,1,1,2,2-PENTAFLUOROPROPANE 审中-公开

    公开(公告)号：EP3325434A1

    公开(公告)日：2018-05-30

    申请号：EP16751323.3

    申请日：2016-07-14

    申请人： Mexichem Fluor S.A. de C.V.

    发明人： JOHNSON, Sheryl Louise ,  FLAHERTY, Stephen Andrew ,  GIDDIS, Clive Robert

    IPC分类号： C07C17/087 ,  C07C17/25 ,  C07C19/08 ,  C07C21/18

    CPC分类号： C07C17/25 ,  C07C17/21 ,  C07C21/18 ,  C07C19/08

    摘要： A process for preparing 1,1,1,2,2-pentafluoropropane (245cb), the process comprising gas phase catalytic dehydrochlorination of a composition comprising 1,1,1-trifluoro-2,3-dichloropropane (243db) to produce an intermediate composition comprising 3,3,3-trifluoro-2-chloro-prop-1-ene (CF3CCl=CH2, 1233xf), hydrogen chloride (HCI) and, optionally, air; and gas phase catalytic fluorination with hydrogen fluoride (HF) of the intermediate composition to produce a reactor product composition comprising 245cb, HF, HCI and air; wherein the process is carried out with a co-feed of air. The two stages of the reaction are preferably carried out in separate reactors, and the reaction is preferably carried out continuously. Addition of air to the second reaction reduces the rate of deactivation of the catalyst(s) by coking. Preferred catalysts for the dehydrochlorination include activated carbon, a zero-valent metal, a metal oxide, a metal oxyhalide, a metal halide or mixtures thereof, particularly preferred is a zinc/chromic catalyst. Hydrogen fluoride may be provided for the dehydrochlorination. The reactor product may also comprise 2,3,3,3-tetrafluoropropene (1234yf). 245cb may also be catalytically dehydrofluorinated to 1234yf in the gas phase.