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    Production of alpha-chloroacrylic acid
    2.
    发明授权
    Production of alpha-chloroacrylic acid 失效
    α-氯丙酸的生产

    公开(公告)号：US3857882A

    公开(公告)日：1974-12-31

    申请号：US38775473

    申请日：1973-08-13

    Applicant: HOECHST AG

    Inventor： AUER E ,  VOGT W ,  GEHRMANN K

    IPC: C07C51/00 ,  C07C51/363 ,  C07C51/377 ,  C07C57/54 ,  C07C67/00

    CPC classification number: C07C57/54 ,  C07C51/377

    Abstract: Production of Alpha -chloroacrylic acid. Acrylic acid and chlorine gas are intimately contacted with one another and the resulting crude reaction product, which predominantly consists of 2,3-dichloropropionic acid, is separated into Alpha chloroacrylic acid and hydrogen chloride. To this end, the reaction produce is introduced into a catalyst zone heated to 80* - 160*C and containing one or more known dehydrochlorination catalysts, wherein Alpha -chloroacrylic acid is continuously distilled off under pressures between 10 and 100 mm of mercury.

    Abstract translation: 生产α-氯丙烯酸。 丙烯酸和氯气彼此紧密接触，所得粗制反应产物（主要由2,3-二氯丙酸组成）分离成α-氯丙烯酸和氯化氢。 为此，将反应产物引入加热至80-160℃的催化剂区域中，并含有一种或多种已知的脱氯化氢催化剂，其中在10至100mm汞柱之间的压力下连续蒸馏出α-氯代丙烯酸。

    PRODUCTION OF ACETIC ANHYDRIDE
    8.
    发明专利
    PRODUCTION OF ACETIC ANHYDRIDE 未知

    公开(公告)号：ZA806057B

    公开(公告)日：1981-10-28

    申请号：ZA806057

    申请日：1980-10-01

    Applicant: HOECHST AG

    Inventor： GEHRMANN K ,  KUEBBELER H ,  ERPENBACH H ,  SCHMITZ K

    IPC: C07C53/12 ,  B01J27/00 ,  B01J31/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/54 ,  C07C51/56 ,  C07C67/00 ,  C07C

    Abstract: The invention relates to an improved process for making acetic anhydride by reacting methyl acetate and/or dimethylether with carbon monoxide under practically anhydrous conditions, at temperatures of 350 to 575 K., under pressures of 1 to 300 bars, and in the presence of a catalyst system containing noble metals belonging to group VIII of the periodic system of the elements, or compounds thereof, iodine and/or its compounds, and an aliphatic carboxylic acid having 1 to 8 carbon atoms. The improved process is effected in the presence of a catalyst system containing, as additional ingredients, a heterocyclic aromatic compound, in which at least one hetero atom is a quaternary nitrogen atom, or a quaternary organophosphorus compound, and a zirconium compound being soluble in the reaction mixture.

    10.
    发明专利
    未知

    公开(公告)号：SE403096B

    公开(公告)日：1978-07-31

    申请号：SE7602714

    申请日：1976-02-27

    Applicant: HOECHST AG

    Inventor： SCHEFER S ,  OHORODNIK A ,  GEHRMANN K ,  MAINSKI A

    IPC: C01B17/90 ,  C07C51/00 ,  C07C51/44 ,  C07C53/08 ,  C07C67/00

    Abstract: Dilute sulfuric acid contaminated with acetic acid and hydrogen chloride is purified with the resultant formation of concentrated sulfuric acid and acetic acid. To this end, the contaminated sulfuric acid is heated in a first step to at most 60 DEG C under 25-30 mm Hg so as to expel all of the hydrogen chloride together with minor proportions of acetic acid and water. In a second step, the sulfuric acid is heated to at most 165 DEG C under 20-25 mm Hg so as to distil off the bulk of acetic acid together with water. In a third step, the sulfuric acid is cooled down to 60 DEG -90 DEG C, diluted with 10-30 wieght % of water with agitation and while cooling is continued. Following this, the sulfuric acid is heated to 160 DEG -165 DEG C under 20-25 mm Hg and thereby freed from the water and residual acetic acid.

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