21.
    发明专利
    未知

    公开(公告)号:NO881345L

    公开(公告)日:1988-09-28

    申请号:NO881345

    申请日:1988-03-25

    Applicant: HOECHST AG

    Abstract: Stabilized pulverulent red phosphorus consisting substantially of particles with a size of at most 2 mm, encapsulated in a thin layer of an oxidation stabilizer consisting of at least one scarcely water-soluble or water-insoluble metal hydroxide and a melamine/formaldehyde-polycondensation product.

    23.
    发明专利
    未知

    公开(公告)号:NO881345D0

    公开(公告)日:1988-03-25

    申请号:NO881345

    申请日:1988-03-25

    Applicant: HOECHST AG

    Abstract: Stabilized pulverulent red phosphorus consisting substantially of particles with a size of at most 2 mm, encapsulated in a thin layer of an oxidation stabilizer consisting of at least one scarcely water-soluble or water-insoluble metal hydroxide and a melamine/formaldehyde-polycondensation product.

    PRODUCTION OF DIALKYLPHOSPHINE OXIDES

    公开(公告)号:CA1083179A

    公开(公告)日:1980-08-05

    申请号:CA262143

    申请日:1976-09-27

    Applicant: HOECHST AG

    Abstract: PRODUCTION OF DIALKYLPHOSPHINE OXIDES. Production of dialkylphosphine oxides of the general formula: in which R1 and R2 each stand for an alkyl group having from 1 to 4 carbon atoms by subjecting a dialkylchlorophosphine of the general formula: in which R1 and R2 have the meanings given above, or an addition product thereof with hydrogen chloride, to alcoholysis with an aliphatic C1 - C4 alcohol in the presence of a protective gas at temperatures between -30 and +30.degree.C, and subjecting the resulting alcoholysate to thermolysis. The compounds are more specifically produced by continuously adding the dialkylchlorophosphine component to the alcohol; subjecting the resulting alcoholysate to thermolysis in a heated separation zone; introducing into the separation zone, countercurrently to the alcoholysate, 10 to 150 l/h of a protective gas, per liter of alcoholysate; removing simultaneously from the separation zone the gaseous thermolysis products and, separately from said products, an alcoholic solution containing desirable final product; neutralizing the alcoholic solution and recovering the final product from said solution in known manner.

Patent Agency Ranking