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    3.
    发明专利
    未知

    公开(公告)号：DE58901422D1

    公开(公告)日：1992-06-17

    申请号：DE58901422

    申请日：1989-12-15

    Applicant: HOECHST AG

    Inventor： VON PLESSEN HELMOLD DR ,  RITTNER SIEGBERT DR

    IPC: C07C51/43 ,  C07C65/03 ,  C07C65/11 ,  C07C205/59 ,  C07D319/12

    Abstract: The invention relates to the dioxane adducts of armoatic meta-or para-hydroxycarboxylic acids, which consist, per mole, of 1 mole of 1,4-dioxane and about 2 moles of hydroxycarboxylic acid. The invention further relates to a process for the preparation of these adducts, which comprises dissolving the hydroxycarboxylic acids in dioxane or a mixture of the latter with water or with an organic solvent and then allowing the adducts to crystallize.

    6.
    发明专利
    未知

    公开(公告)号：DE58900748D1

    公开(公告)日：1992-03-05

    申请号：DE58900748

    申请日：1989-05-05

    Applicant: HOECHST AG

    Inventor： VON PLESSEN HELMOLD DR ,  RITTNER SIEGBERT DR

    IPC: C07C51/00 ,  C07C65/11 ,  C07C65/24 ,  C07D319/12 ,  C08G63/06

    Abstract: The dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid which comprises 1 mol of 1,4-dioxane and about 2 mol of 2-hydroxynaphthalene-6-carboxylic acid per mole is prepared by dissolving 2-hydroxynaphthalene-6-carboxylic acid in dioxane or a mixture thereof with water or an organic solvent and then allowing the adduct to crystallise.

    PROCESS FOR SEPARATING HEAVY METAL VALUES FROM INTERMEDIATE PRODUCTS IN THE MANUFACTURE OF PHOSPHATIC FERTILIZERS
    7.
    发明专利
    PROCESS FOR SEPARATING HEAVY METAL VALUES FROM INTERMEDIATE PRODUCTS IN THE MANUFACTURE OF PHOSPHATIC FERTILIZERS 未知

    公开(公告)号：DE3273369D1

    公开(公告)日：1986-10-23

    申请号：DE3273369

    申请日：1982-10-26

    Applicant: HOECHST AG

    Inventor： VON PLESSEN HELMOLD DR ,  SCHIMMEL GUNTHER DR ,  KLEINER HANS-JERG DR

    IPC: C01B25/238 ,  C01B25/46 ,  C22B3/00 ,  C22B3/38

    Abstract: 1. A process for the separation of cadmium- or mercury-compounds from crude phosphoric acids which are produced by solubilization of crude phosphate by means of nitric acid and by removing the main fraction of the calcium nitrate thus formed which comprises adjusting the pH of the crude phosphoric acid by means of ammonia to a value between 0.5 and 1.5 and extracting the phosphoric acid solution with an organic phosphor compound of formula I, see diagramm : EP0078051,P6,F2 wherein R1 and R2 are identical or different and are saturated or unsaturated aliphatic, araliphatic or aromatic (C1 -C18 )-hydrocarbon radicals which are optionally substituted, and R1 and R2 together have 6 to 36 C-atoms, and optionally form together a substituted twice bonded radical, and n is independently of one another 0 or 1, or with a mixture thereof.

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