3.
    发明专利
    未知

    公开(公告)号:DE2157609A1

    公开(公告)日:1973-05-30

    申请号:DE2157609

    申请日:1971-11-20

    Applicant: HOECHST AG

    Abstract: 1407059 Oil-soluble monoazo dye mixtures HOECHST AG 15 Nov 1972 [20 Nov 1971] 52739/72 Heading C4P Mixtures of monoazo dyes of formula wherein represents the residue of a mixture of 2 to 10 diazotized anilines, R 1 and R 2 are H atoms or C 1-4 alkyl or alkoxy groups and A is the residue of phenol and #-naphthol are prepared by coupling the mixture of diazotized anilines with a mixture of phenol and #-naphthol. The dyes may be used to colour lacquers, printing pastes, resins, fibrous materials and paper in orange shades but are preferably dissolved in aromatic solvents during or after manufacture and the concentrates obtained used to colour gasoline and mineral oils.

    8.
    发明专利
    未知

    公开(公告)号:DE2621168A1

    公开(公告)日:1977-11-17

    申请号:DE2621168

    申请日:1976-05-13

    Applicant: HOECHST AG

    Abstract: Pure toluene-4-sulfonic acid is obtained without forming any by-products by sulfonating toluene with sulfuric acid at an elevated temperature, separating a first batch of toluene-4-sulfonic acid hydrate, washing it free of isomers with sulfuric acid, combining the mother liquor and the washing effluent, heating them, allowing a second batch of hydrate to crystallize and, optionally, working up the final mother liquor by hydrolizing the toluene sulfonic acids therein and recycling the toluene so formed and the sulfuric acid after concentrating it to its initial strength.

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