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    Prepn. of vinyl chloride from 1,2-di:chloroethane - by thermal decomposition, with cooling of effluent gas in three stages
    42.
    发明专利
    Prepn. of vinyl chloride from 1,2-di:chloroethane - by thermal decomposition, with cooling of effluent gas in three stages 未知

    公开(公告)号：DE3013107A1

    公开(公告)日：1981-10-08

    申请号：DE3013107

    申请日：1980-04-03

    Applicant: HOECHST AG

    Inventor： KRUMBOECK REINHARD ,  FROEHLICH WALTER ,  RIEDL JOSEF ,  LINK GERHARD

    IPC: C07C17/25 ,  C07C21/06 ,  C07C17/34 ,  C07C17/38

    Abstract: Parent patent described the prepn. of vinyl chloride by thermal decomposition of 1,2-dichloroethane, where the effluent gas mixt. leaving the reactor is cooled indirectly by a liq. or gaseous coolant, and is then sepd. by distn. Cooling is in at least 2 stages, at an average rate per second of 1/10 of the temp., the deg. C, of entry into the indirect cooling zone, until the temp. is 220-120 deg. C. The heat given up to the coolant is used to heat the appts., and the decomposition gas mixt., opt. with a liq. condensate formed from it, is cooled (in)directly in at least 1 further stage. In this addn., the decomposition gas mixt. is cooled in the following stages: (1) indirect cooling to about 220 deg. C, (2) partly direct and partly indirect cooling to about 140 deg. C, with intermittent addn. of a liq. contg. mainly 1,2-dichloroethane (I), and (3) (in)direct cooling in at least 1 further stage, to the temp. of entry into the column in which HCl is sepd. from the thermal decomposition prods. The efficiency of the process is improved, and the interval between times of shutting down the plant for cleaning is lengthened. Formation of deposits on the walls during stage (2) is prevented or reduced.

    43.
    发明专利
    未知

    公开(公告)号：RO72435A

    公开(公告)日：1981-06-26

    申请号：RO8190375

    申请日：1975-04-05

    Applicant: HOECHST AG

    Inventor： RIEDL JOSEF ,  FROHLICH WALTER ,  MITTERMAIER ERICH

    IPC: B01J12/00 ,  B01J19/24 ,  C07C17/00 ,  C07C17/25 ,  C07C17/395 ,  C07C21/06 ,  C07C67/00

    Abstract: Vinyl chloride is produced by pyrolytic decomposition of 1,2-dichloroethane in a furnace with coiled up reaction tube having an internal diameter of from 12 to 16 cm. The dichloroethane is vaporized completely in the convection zone of the pyrolytic furnace, different amounts of heat are supplied to the different zones of the reaction tube and, after decomposition in the working up of the reaction products, the low-boiling constitutents are treated with chlorine and separated together with the high-boiling constituents.

    46.
    发明专利
    未知

    公开(公告)号：NO801613L

    公开(公告)日：1980-12-02

    申请号：NO801613

    申请日：1980-05-30

    Applicant: HOECHST AG

    Inventor： RIEDL JOSEF ,  KUEHN WENZEL ,  WIDMANN PETER

    IPC: B01J23/00 ,  B01J23/72 ,  B01J23/74 ,  B01J27/10 ,  B01J27/122 ,  B01J27/128 ,  C07B61/00 ,  C07C17/00 ,  C07C17/02 ,  C07C17/156 ,  C07C19/045 ,  C07C67/00 ,  C07C

    Abstract: A process for the manufacture of 1,2-dichloroethane from ethylene by reaction with hydrogen chloride and inert gases containing oxygen, and also by reaction with chlorine, is described. The two chlorination reactions are carried out successively at 180 DEG to 360 DEG C. and under a pressure of 0.09 to 1.1 MPa in a common reaction space containing fluidized catalyst particles. A stoichiometric excess of ethylene is employed for the first chlorination reaction. The heat formed in the reaction space is removed by indirect cooling. The process is simple in terms of apparatus and permits a better re-use of the total heat of reaction of the chlorination of ethylene.

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