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    Production of vinyl chloride by thermal cracking 1,2-dichloroethane
    1.
    发明授权
    Production of vinyl chloride by thermal cracking 1,2-dichloroethane 失效
    通过热裂解生产氯乙烯1,2-二氯乙烷

    公开(公告)号：US3903182A

    公开(公告)日：1975-09-02

    申请号：US45043774

    申请日：1974-03-12

    Applicant: HOECHST AG

    Inventor： RECHMEIER GERHARD ,  MITTLER WERNER ,  WESSELMANN RUDOLF

    IPC: C07C17/00 ,  C07C17/25 ,  C07C21/06 ,  C07C67/00

    CPC classification number: C07C17/25 ,  C07C21/06

    Abstract: Production of vinyl chloride, wherein 1,2-dichloroethane is evaporated under pressure in an evaporation stage and resulting 1,2-dichloroethane in vapor form is thermally cracked at a temperature substantially within the range 450*-650*C with the resultant formation of vinyl chloride. To this end, 1,2-dichloroethane is partially evaporated in the evaporation stage at a temperature substantially within the range 210*-250*C and under a pressure substantially within the range 20-35 atmospheres gauge; liquid 1,2-dichloroethane is separated in a separation stage from a mixture formed of liquid 1,2dichloroethane and 1,2-dichloroethane in vapor form; the liquid 1,2-dichloroethane fractions are filtered and recycled to the evaporation stage, if desired in admixture with fresh 1,2dichloroethane; 1,2-dichloroethane in vapor form, which escapes near the head of the separator, is introduced into the cracking reactor and thermally cracked therein.

    Abstract translation: 生产氯乙烯，其中1,2-二氯乙烷在蒸发阶段在压力下蒸发，所得蒸气形式的1,2-二氯乙烷在基本上在450-650℃范围内的温度下热裂化，从而形成 氯乙烯。

    CONTINUOUS REMOVAL OF MONOMERS FROM AN AQUEOUS DISPERSION OF A POLYMER
    6.
    发明专利
    CONTINUOUS REMOVAL OF MONOMERS FROM AN AQUEOUS DISPERSION OF A POLYMER 未知

    公开(公告)号：CA1130039A

    公开(公告)日：1982-08-17

    申请号：CA286313

    申请日：1977-09-08

    Applicant: HOECHST AG

    Inventor： KUXDORF BERNHARD ,  KAISER KARL ,  WESSELMANN RUDOLF

    IPC: C08F14/00 ,  B01D3/22 ,  C08F6/00 ,  C08F6/06 ,  C08F6/16 ,  C08F6/24

    Abstract: An aqueous polymer dispersion containing approximately 1 to 60 weight % of solid polymer particles with an average size of 20 to 500 microns and 5000 to 15000 ppm of monomer(s), is freed from monomeric material. More specifically, the aqueous dispersion is preheated to 60 to 90.degree.C and introduced continuously into an upper portion of a column accommodating a plurality of apertured trays disposed one above another of which each has at least one eccentric aqueous dispersion descent shaft, The aqueous dispersion is introduced at a rate of a 5 to 35 m3 per m2 of tray area per hour and contacted countercurrently with steam at 80 to 150.degree.C, under 0.5 to 5 bars, and in a proportion of 30 to 100 kg of steam per m3 of dispersion, for a mean period of 1 to 30 minutes: the pressure drop for steam ascending through one tray in the column being lower than that which would occur upon the undesirable passage of steam through one of the said shafts. At the column base, aqueous dispersion freed from monomeric material is removed and a vapour mixture emerging at an upper level of the column, is condensed, and monomeric material and an aqueous phase are recovered therefrom.

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