131.
    发明专利
    未知

    公开(公告)号:DE2256450A1

    公开(公告)日:1974-05-22

    申请号:DE2256450

    申请日:1972-11-17

    Applicant: BASF AG

    Abstract: Berylloaluminosilicates having faujasite structure are described. These beryllium zeolites (Y-zeolites) can have substantially higher Al2O3/SiO2 ratios than the berylliumfree aluminosilicates of similar structure; they can be obtained hydrothermally from aqueous mixtures of the components and can be used instead of the faujasites in industrial processes involving absorption or catalysts.

    136.
    发明专利
    未知

    公开(公告)号:AT258926B

    公开(公告)日:1967-12-27

    申请号:AT362365

    申请日:1965-04-20

    Applicant: BASF AG

    Abstract: Melamine is made by heating urea, and/or its thermal decomposition products, at 300-450 DEG C. in the presence of added ammonia or gas containing ammonia and a catalyst comprising aluminium oxide which has been prepared by calcining bohmite, bayerite, hydrargyllite or a mixture thereof at 700-1000 DEG C. The added ammonia may be in the form of the off-gas containing CO2 which is obtained after removing melamine from the reaction gases. The catalyst may be regenerated by treatment with ammonia at elevated temperatures. The process is effected in a continuous manner. The examples relate to a catalyst obtained by calcining a mixture of bohmite and bayerite.

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